// SPDX-License-Identifier: GPL-2.0-only
/*
* tools / testing / selftests / kvm / lib / kvm_util . c
*
* Copyright ( C ) 2018 , Google LLC .
*/
#include "test_util.h"
#include "kvm_util.h"
#include "processor.h"
#include "ucall_common.h"
#include <assert.h>
#include <sched.h>
#include <sys/mman.h>
#include <sys/resource.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <linux/kernel.h>
#define KVM_UTIL_MIN_PFN 2
uint32_t guest_random_seed;
struct guest_random_state guest_rng;
static uint32_t last_guest_seed;
static int vcpu_mmap_sz(void );
int __open_path_or_exit(const char *path, int flags, const char *enoent_help)
{
int fd;
fd = open(path, flags);
if (fd < 0 )
goto error;
return fd;
error:
if (errno == EACCES || errno == ENOENT)
ksft_exit_skip("- Cannot open '%s': %s. %s\n" ,
path, strerror(errno),
errno == EACCES ? "Root required?" : enoent_help);
TEST_FAIL("Failed to open '%s'" , path);
}
int open_path_or_exit(const char *path, int flags)
{
return __open_path_or_exit(path, flags, "" );
}
/*
* Open KVM_DEV_PATH if available , otherwise exit the entire program .
*
* Input Args :
* flags - The flags to pass when opening KVM_DEV_PATH .
*
* Return :
* The opened file descriptor of / dev / kvm .
*/
static int _open_kvm_dev_path_or_exit(int flags)
{
return __open_path_or_exit(KVM_DEV_PATH, flags, "Is KVM loaded and enabled?" );
}
int open_kvm_dev_path_or_exit(void )
{
return _open_kvm_dev_path_or_exit(O_RDONLY);
}
static ssize_t get_module_param(const char *module_name, const char *param,
void *buffer, size_t buffer_size)
{
const int path_size = 128 ;
char path[path_size];
ssize_t bytes_read;
int fd, r;
/* Verify KVM is loaded, to provide a more helpful SKIP message. */
close(open_kvm_dev_path_or_exit());
r = snprintf(path, path_size, "/sys/module/%s/parameters/%s" ,
module_name, param);
TEST_ASSERT(r < path_size,
"Failed to construct sysfs path in %d bytes." , path_size);
fd = open_path_or_exit(path, O_RDONLY);
bytes_read = read(fd, buffer, buffer_size);
TEST_ASSERT(bytes_read > 0 , "read(%s) returned %ld, wanted %ld bytes" ,
path, bytes_read, buffer_size);
r = close(fd);
TEST_ASSERT(!r, "close(%s) failed" , path);
return bytes_read;
}
static int get_module_param_integer(const char *module_name, const char *param)
{
/*
* 16 bytes to hold a 64 - bit value ( 1 byte per char ) , 1 byte for the
* NUL char , and 1 byte because the kernel sucks and inserts a newline
* at the end .
*/
char value[16 + 1 + 1 ];
ssize_t r;
memset(value, '\0' , sizeof (value));
r = get_module_param(module_name, param, value, sizeof (value));
TEST_ASSERT(value[r - 1 ] == '\n' ,
"Expected trailing newline, got char '%c'" , value[r - 1 ]);
/*
* Squash the newline , otherwise atoi_paranoid ( ) will complain about
* trailing non - NUL characters in the string .
*/
value[r - 1 ] = '\0' ;
return atoi_paranoid(value);
}
static bool get_module_param_bool(const char *module_name, const char *param)
{
char value;
ssize_t r;
r = get_module_param(module_name, param, &value, sizeof (value));
TEST_ASSERT_EQ(r, 1 );
if (value == 'Y' )
return true ;
else if (value == 'N' )
return false ;
TEST_FAIL("Unrecognized value '%c' for boolean module param" , value);
}
bool get_kvm_param_bool(const char *param)
{
return get_module_param_bool("kvm" , param);
}
bool get_kvm_intel_param_bool(const char *param)
{
return get_module_param_bool("kvm_intel" , param);
}
bool get_kvm_amd_param_bool(const char *param)
{
return get_module_param_bool("kvm_amd" , param);
}
int get_kvm_param_integer(const char *param)
{
return get_module_param_integer("kvm" , param);
}
int get_kvm_intel_param_integer(const char *param)
{
return get_module_param_integer("kvm_intel" , param);
}
int get_kvm_amd_param_integer(const char *param)
{
return get_module_param_integer("kvm_amd" , param);
}
/*
* Capability
*
* Input Args :
* cap - Capability
*
* Output Args : None
*
* Return :
* On success , the Value corresponding to the capability ( KVM_CAP_ * )
* specified by the value of cap . On failure a TEST_ASSERT failure
* is produced .
*
* Looks up and returns the value corresponding to the capability
* ( KVM_CAP_ * ) given by cap .
*/
unsigned int kvm_check_cap(long cap)
{
int ret;
int kvm_fd;
kvm_fd = open_kvm_dev_path_or_exit();
ret = __kvm_ioctl(kvm_fd, KVM_CHECK_EXTENSION, (void *)cap);
TEST_ASSERT(ret >= 0 , KVM_IOCTL_ERROR(KVM_CHECK_EXTENSION, ret));
close(kvm_fd);
return (unsigned int )ret;
}
void vm_enable_dirty_ring(struct kvm_vm *vm, uint32_t ring_size)
{
if (vm_check_cap(vm, KVM_CAP_DIRTY_LOG_RING_ACQ_REL))
vm_enable_cap(vm, KVM_CAP_DIRTY_LOG_RING_ACQ_REL, ring_size);
else
vm_enable_cap(vm, KVM_CAP_DIRTY_LOG_RING, ring_size);
vm->dirty_ring_size = ring_size;
}
static void vm_open(struct kvm_vm *vm)
{
vm->kvm_fd = _open_kvm_dev_path_or_exit(O_RDWR);
TEST_REQUIRE(kvm_has_cap(KVM_CAP_IMMEDIATE_EXIT));
vm->fd = __kvm_ioctl(vm->kvm_fd, KVM_CREATE_VM, (void *)vm->type);
TEST_ASSERT(vm->fd >= 0 , KVM_IOCTL_ERROR(KVM_CREATE_VM, vm->fd));
if (kvm_has_cap(KVM_CAP_BINARY_STATS_FD))
vm->stats.fd = vm_get_stats_fd(vm);
else
vm->stats.fd = -1 ;
}
const char *vm_guest_mode_string(uint32_t i)
{
static const char * const strings[] = {
[VM_MODE_P52V48_4K] = "PA-bits:52, VA-bits:48, 4K pages" ,
[VM_MODE_P52V48_16K] = "PA-bits:52, VA-bits:48, 16K pages" ,
[VM_MODE_P52V48_64K] = "PA-bits:52, VA-bits:48, 64K pages" ,
[VM_MODE_P48V48_4K] = "PA-bits:48, VA-bits:48, 4K pages" ,
[VM_MODE_P48V48_16K] = "PA-bits:48, VA-bits:48, 16K pages" ,
[VM_MODE_P48V48_64K] = "PA-bits:48, VA-bits:48, 64K pages" ,
[VM_MODE_P40V48_4K] = "PA-bits:40, VA-bits:48, 4K pages" ,
[VM_MODE_P40V48_16K] = "PA-bits:40, VA-bits:48, 16K pages" ,
[VM_MODE_P40V48_64K] = "PA-bits:40, VA-bits:48, 64K pages" ,
[VM_MODE_PXXV48_4K] = "PA-bits:ANY, VA-bits:48, 4K pages" ,
[VM_MODE_P47V64_4K] = "PA-bits:47, VA-bits:64, 4K pages" ,
[VM_MODE_P44V64_4K] = "PA-bits:44, VA-bits:64, 4K pages" ,
[VM_MODE_P36V48_4K] = "PA-bits:36, VA-bits:48, 4K pages" ,
[VM_MODE_P36V48_16K] = "PA-bits:36, VA-bits:48, 16K pages" ,
[VM_MODE_P36V48_64K] = "PA-bits:36, VA-bits:48, 64K pages" ,
[VM_MODE_P47V47_16K] = "PA-bits:47, VA-bits:47, 16K pages" ,
[VM_MODE_P36V47_16K] = "PA-bits:36, VA-bits:47, 16K pages" ,
};
_Static_assert(sizeof (strings)/sizeof (char *) == NUM_VM_MODES,
"Missing new mode strings?" );
TEST_ASSERT(i < NUM_VM_MODES, "Guest mode ID %d too big" , i);
return strings[i];
}
const struct vm_guest_mode_params vm_guest_mode_params[] = {
[VM_MODE_P52V48_4K] = { 52 , 48 , 0 x1000, 12 },
[VM_MODE_P52V48_16K] = { 52 , 48 , 0 x4000, 14 },
[VM_MODE_P52V48_64K] = { 52 , 48 , 0 x10000, 16 },
[VM_MODE_P48V48_4K] = { 48 , 48 , 0 x1000, 12 },
[VM_MODE_P48V48_16K] = { 48 , 48 , 0 x4000, 14 },
[VM_MODE_P48V48_64K] = { 48 , 48 , 0 x10000, 16 },
[VM_MODE_P40V48_4K] = { 40 , 48 , 0 x1000, 12 },
[VM_MODE_P40V48_16K] = { 40 , 48 , 0 x4000, 14 },
[VM_MODE_P40V48_64K] = { 40 , 48 , 0 x10000, 16 },
[VM_MODE_PXXV48_4K] = { 0 , 0 , 0 x1000, 12 },
[VM_MODE_P47V64_4K] = { 47 , 64 , 0 x1000, 12 },
[VM_MODE_P44V64_4K] = { 44 , 64 , 0 x1000, 12 },
[VM_MODE_P36V48_4K] = { 36 , 48 , 0 x1000, 12 },
[VM_MODE_P36V48_16K] = { 36 , 48 , 0 x4000, 14 },
[VM_MODE_P36V48_64K] = { 36 , 48 , 0 x10000, 16 },
[VM_MODE_P47V47_16K] = { 47 , 47 , 0 x4000, 14 },
[VM_MODE_P36V47_16K] = { 36 , 47 , 0 x4000, 14 },
};
_Static_assert(sizeof (vm_guest_mode_params)/sizeof (struct vm_guest_mode_params) == NUM_VM_MODES,
"Missing new mode params?" );
/*
* Initializes vm - > vpages_valid to match the canonical VA space of the
* architecture .
*
* The default implementation is valid for architectures which split the
* range addressed by a single page table into a low and high region
* based on the MSB of the VA . On architectures with this behavior
* the VA region spans [ 0 , 2 ^ ( va_bits - 1 ) ) , [ - ( 2 ^ ( va_bits - 1 ) , - 1 ] .
*/
__weak void vm_vaddr_populate_bitmap(struct kvm_vm *vm)
{
sparsebit_set_num(vm->vpages_valid,
0 , (1 ULL << (vm->va_bits - 1 )) >> vm->page_shift);
sparsebit_set_num(vm->vpages_valid,
(~((1 ULL << (vm->va_bits - 1 )) - 1 )) >> vm->page_shift,
(1 ULL << (vm->va_bits - 1 )) >> vm->page_shift);
}
struct kvm_vm *____vm_create(struct vm_shape shape)
{
struct kvm_vm *vm;
vm = calloc(1 , sizeof (*vm));
TEST_ASSERT(vm != NULL, "Insufficient Memory" );
INIT_LIST_HEAD(&vm->vcpus);
vm->regions.gpa_tree = RB_ROOT;
vm->regions.hva_tree = RB_ROOT;
hash_init(vm->regions.slot_hash);
vm->mode = shape.mode;
vm->type = shape.type;
vm->pa_bits = vm_guest_mode_params[vm->mode].pa_bits;
vm->va_bits = vm_guest_mode_params[vm->mode].va_bits;
vm->page_size = vm_guest_mode_params[vm->mode].page_size;
vm->page_shift = vm_guest_mode_params[vm->mode].page_shift;
/* Setup mode specific traits. */
switch (vm->mode) {
case VM_MODE_P52V48_4K:
vm->pgtable_levels = 4 ;
break ;
case VM_MODE_P52V48_64K:
vm->pgtable_levels = 3 ;
break ;
case VM_MODE_P48V48_4K:
vm->pgtable_levels = 4 ;
break ;
case VM_MODE_P48V48_64K:
vm->pgtable_levels = 3 ;
break ;
case VM_MODE_P40V48_4K:
case VM_MODE_P36V48_4K:
vm->pgtable_levels = 4 ;
break ;
case VM_MODE_P40V48_64K:
case VM_MODE_P36V48_64K:
vm->pgtable_levels = 3 ;
break ;
case VM_MODE_P52V48_16K:
case VM_MODE_P48V48_16K:
case VM_MODE_P40V48_16K:
case VM_MODE_P36V48_16K:
vm->pgtable_levels = 4 ;
break ;
case VM_MODE_P47V47_16K:
case VM_MODE_P36V47_16K:
vm->pgtable_levels = 3 ;
break ;
case VM_MODE_PXXV48_4K:
#ifdef __x86_64__
kvm_get_cpu_address_width(&vm->pa_bits, &vm->va_bits);
kvm_init_vm_address_properties(vm);
/*
* Ignore KVM support for 5 - level paging ( vm - > va_bits = = 57 ) ,
* it doesn ' t take effect unless a CR4 . LA57 is set , which it
* isn ' t for this mode ( 48 - bit virtual address space ) .
*/
TEST_ASSERT(vm->va_bits == 48 || vm->va_bits == 57 ,
"Linear address width (%d bits) not supported" ,
vm->va_bits);
pr_debug("Guest physical address width detected: %d\n" ,
vm->pa_bits);
vm->pgtable_levels = 4 ;
vm->va_bits = 48 ;
#else
TEST_FAIL("VM_MODE_PXXV48_4K not supported on non-x86 platforms" );
#endif
break ;
case VM_MODE_P47V64_4K:
vm->pgtable_levels = 5 ;
break ;
case VM_MODE_P44V64_4K:
vm->pgtable_levels = 5 ;
break ;
default :
TEST_FAIL("Unknown guest mode: 0x%x" , vm->mode);
}
#ifdef __aarch64__
TEST_ASSERT(!vm->type, "ARM doesn't support test-provided types" );
if (vm->pa_bits != 40 )
vm->type = KVM_VM_TYPE_ARM_IPA_SIZE(vm->pa_bits);
#endif
vm_open(vm);
/* Limit to VA-bit canonical virtual addresses. */
vm->vpages_valid = sparsebit_alloc();
vm_vaddr_populate_bitmap(vm);
/* Limit physical addresses to PA-bits. */
vm->max_gfn = vm_compute_max_gfn(vm);
/* Allocate and setup memory for guest. */
vm->vpages_mapped = sparsebit_alloc();
return vm;
}
static uint64_t vm_nr_pages_required(enum vm_guest_mode mode,
uint32_t nr_runnable_vcpus,
uint64_t extra_mem_pages)
{
uint64_t page_size = vm_guest_mode_params[mode].page_size;
uint64_t nr_pages;
TEST_ASSERT(nr_runnable_vcpus,
"Use vm_create_barebones() for VMs that _never_ have vCPUs" );
TEST_ASSERT(nr_runnable_vcpus <= kvm_check_cap(KVM_CAP_MAX_VCPUS),
"nr_vcpus = %d too large for host, max-vcpus = %d" ,
nr_runnable_vcpus, kvm_check_cap(KVM_CAP_MAX_VCPUS));
/*
* Arbitrarily allocate 512 pages ( 2 mb when page size is 4 kb ) for the
* test code and other per - VM assets that will be loaded into memslot0 .
*/
nr_pages = 512 ;
/* Account for the per-vCPU stacks on behalf of the test. */
nr_pages += nr_runnable_vcpus * DEFAULT_STACK_PGS;
/*
* Account for the number of pages needed for the page tables . The
* maximum page table size for a memory region will be when the
* smallest page size is used . Considering each page contains x page
* table descriptors , the total extra size for page tables ( for extra
* N pages ) will be : N / x + N / x ^ 2 + N / x ^ 3 + . . . which is definitely smaller
* than N / x * 2 .
*/
nr_pages += (nr_pages + extra_mem_pages) / PTES_PER_MIN_PAGE * 2 ;
/* Account for the number of pages needed by ucall. */
nr_pages += ucall_nr_pages_required(page_size);
return vm_adjust_num_guest_pages(mode, nr_pages);
}
void kvm_set_files_rlimit(uint32_t nr_vcpus)
{
/*
* Each vCPU will open two file descriptors : the vCPU itself and the
* vCPU ' s binary stats file descriptor . Add an arbitrary amount of
* buffer for all other files a test may open .
*/
int nr_fds_wanted = nr_vcpus * 2 + 100 ;
struct rlimit rl;
/*
* Check that we ' re allowed to open nr_fds_wanted file descriptors and
* try raising the limits if needed .
*/
TEST_ASSERT(!getrlimit(RLIMIT_NOFILE, &rl), "getrlimit() failed!" );
if (rl.rlim_cur < nr_fds_wanted) {
rl.rlim_cur = nr_fds_wanted;
if (rl.rlim_max < nr_fds_wanted) {
int old_rlim_max = rl.rlim_max;
rl.rlim_max = nr_fds_wanted;
__TEST_REQUIRE(setrlimit(RLIMIT_NOFILE, &rl) >= 0 ,
"RLIMIT_NOFILE hard limit is too low (%d, wanted %d)" ,
old_rlim_max, nr_fds_wanted);
} else {
TEST_ASSERT(!setrlimit(RLIMIT_NOFILE, &rl), "setrlimit() failed!" );
}
}
}
static bool is_guest_memfd_required(struct vm_shape shape)
{
#ifdef __x86_64__
return shape.type == KVM_X86_SNP_VM;
#else
return false ;
#endif
}
struct kvm_vm *__vm_create(struct vm_shape shape, uint32_t nr_runnable_vcpus,
uint64_t nr_extra_pages)
{
uint64_t nr_pages = vm_nr_pages_required(shape.mode, nr_runnable_vcpus,
nr_extra_pages);
struct userspace_mem_region *slot0;
struct kvm_vm *vm;
int i, flags;
kvm_set_files_rlimit(nr_runnable_vcpus);
pr_debug("%s: mode='%s' type='%d', pages='%ld'\n" , __func__,
vm_guest_mode_string(shape.mode), shape.type, nr_pages);
vm = ____vm_create(shape);
/*
* Force GUEST_MEMFD for the primary memory region if necessary , e . g .
* for CoCo VMs that require GUEST_MEMFD backed private memory .
*/
flags = 0 ;
if (is_guest_memfd_required(shape))
flags |= KVM_MEM_GUEST_MEMFD;
vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, 0 , 0 , nr_pages, flags);
for (i = 0 ; i < NR_MEM_REGIONS; i++)
vm->memslots[i] = 0 ;
kvm_vm_elf_load(vm, program_invocation_name);
/*
* TODO : Add proper defines to protect the library ' s memslots , and then
* carve out memslot1 for the ucall MMIO address . KVM treats writes to
* read - only memslots as MMIO , and creating a read - only memslot for the
* MMIO region would prevent silently clobbering the MMIO region .
*/
slot0 = memslot2region(vm, 0 );
ucall_init(vm, slot0->region.guest_phys_addr + slot0->region.memory_size);
if (guest_random_seed != last_guest_seed) {
pr_info("Random seed: 0x%x\n" , guest_random_seed);
last_guest_seed = guest_random_seed;
}
guest_rng = new_guest_random_state(guest_random_seed);
sync_global_to_guest(vm, guest_rng);
kvm_arch_vm_post_create(vm);
return vm;
}
/*
* VM Create with customized parameters
*
* Input Args :
* mode - VM Mode ( e . g . VM_MODE_P52V48_4K )
* nr_vcpus - VCPU count
* extra_mem_pages - Non - slot0 physical memory total size
* guest_code - Guest entry point
* vcpuids - VCPU IDs
*
* Output Args : None
*
* Return :
* Pointer to opaque structure that describes the created VM .
*
* Creates a VM with the mode specified by mode ( e . g . VM_MODE_P52V48_4K ) .
* extra_mem_pages is only used to calculate the maximum page table size ,
* no real memory allocation for non - slot0 memory in this function .
*/
struct kvm_vm *__vm_create_with_vcpus(struct vm_shape shape, uint32_t nr_vcpus,
uint64_t extra_mem_pages,
void *guest_code, struct kvm_vcpu *vcpus[])
{
struct kvm_vm *vm;
int i;
TEST_ASSERT(!nr_vcpus || vcpus, "Must provide vCPU array" );
vm = __vm_create(shape, nr_vcpus, extra_mem_pages);
for (i = 0 ; i < nr_vcpus; ++i)
vcpus[i] = vm_vcpu_add(vm, i, guest_code);
return vm;
}
struct kvm_vm *__vm_create_shape_with_one_vcpu(struct vm_shape shape,
struct kvm_vcpu **vcpu,
uint64_t extra_mem_pages,
void *guest_code)
{
struct kvm_vcpu *vcpus[1 ];
struct kvm_vm *vm;
vm = __vm_create_with_vcpus(shape, 1 , extra_mem_pages, guest_code, vcpus);
*vcpu = vcpus[0 ];
return vm;
}
/*
* VM Restart
*
* Input Args :
* vm - VM that has been released before
*
* Output Args : None
*
* Reopens the file descriptors associated to the VM and reinstates the
* global state , such as the irqchip and the memory regions that are mapped
* into the guest .
*/
void kvm_vm_restart(struct kvm_vm *vmp)
{
int ctr;
struct userspace_mem_region *region;
vm_open(vmp);
if (vmp->has_irqchip)
vm_create_irqchip(vmp);
hash_for_each(vmp->regions.slot_hash, ctr, region, slot_node) {
int ret = ioctl(vmp->fd, KVM_SET_USER_MEMORY_REGION2, ®ion->region);
TEST_ASSERT(ret == 0 , "KVM_SET_USER_MEMORY_REGION2 IOCTL failed,\n"
" rc: %i errno: %i\n"
" slot: %u flags: 0x%x\n"
" guest_phys_addr: 0x%llx size: 0x%llx" ,
ret, errno, region->region.slot,
region->region.flags,
region->region.guest_phys_addr,
region->region.memory_size);
}
}
__weak struct kvm_vcpu *vm_arch_vcpu_recreate(struct kvm_vm *vm,
uint32_t vcpu_id)
{
return __vm_vcpu_add(vm, vcpu_id);
}
struct kvm_vcpu *vm_recreate_with_one_vcpu(struct kvm_vm *vm)
{
kvm_vm_restart(vm);
return vm_vcpu_recreate(vm, 0 );
}
int __pin_task_to_cpu(pthread_t task, int cpu)
{
cpu_set_t cpuset;
CPU_ZERO(&cpuset);
CPU_SET(cpu, &cpuset);
return pthread_setaffinity_np(task, sizeof (cpuset), &cpuset);
}
static uint32_t parse_pcpu(const char *cpu_str, const cpu_set_t *allowed_mask)
{
uint32_t pcpu = atoi_non_negative("CPU number" , cpu_str);
TEST_ASSERT(CPU_ISSET(pcpu, allowed_mask),
"Not allowed to run on pCPU '%d', check cgroups?" , pcpu);
return pcpu;
}
void kvm_print_vcpu_pinning_help(void )
{
const char *name = program_invocation_name;
printf(" -c: Pin tasks to physical CPUs. Takes a list of comma separated\n"
" values (target pCPU), one for each vCPU, plus an optional\n"
" entry for the main application task (specified via entry\n"
" <nr_vcpus + 1>). If used, entries must be provided for all\n"
" vCPUs, i.e. pinning vCPUs is all or nothing.\n\n"
" E.g. to create 3 vCPUs, pin vCPU0=>pCPU22, vCPU1=>pCPU23,\n"
" vCPU2=>pCPU24, and pin the application task to pCPU50:\n\n"
" %s -v 3 -c 22,23,24,50\n\n"
" To leave the application task unpinned, drop the final entry:\n\n"
" %s -v 3 -c 22,23,24\n\n"
" (default: no pinning)\n" , name, name);
}
void kvm_parse_vcpu_pinning(const char *pcpus_string, uint32_t vcpu_to_pcpu[],
int nr_vcpus)
{
cpu_set_t allowed_mask;
char *cpu, *cpu_list;
char delim[2 ] = "," ;
int i, r;
cpu_list = strdup(pcpus_string);
TEST_ASSERT(cpu_list, "strdup() allocation failed." );
r = sched_getaffinity(0 , sizeof (allowed_mask), &allowed_mask);
TEST_ASSERT(!r, "sched_getaffinity() failed" );
cpu = strtok(cpu_list, delim);
/* 1. Get all pcpus for vcpus. */
for (i = 0 ; i < nr_vcpus; i++) {
TEST_ASSERT(cpu, "pCPU not provided for vCPU '%d'" , i);
vcpu_to_pcpu[i] = parse_pcpu(cpu, &allowed_mask);
cpu = strtok(NULL, delim);
}
/* 2. Check if the main worker needs to be pinned. */
if (cpu) {
pin_self_to_cpu(parse_pcpu(cpu, &allowed_mask));
cpu = strtok(NULL, delim);
}
TEST_ASSERT(!cpu, "pCPU list contains trailing garbage characters '%s'" , cpu);
free(cpu_list);
}
/*
* Userspace Memory Region Find
*
* Input Args :
* vm - Virtual Machine
* start - Starting VM physical address
* end - Ending VM physical address , inclusive .
*
* Output Args : None
*
* Return :
* Pointer to overlapping region , NULL if no such region .
*
* Searches for a region with any physical memory that overlaps with
* any portion of the guest physical addresses from start to end
* inclusive . If multiple overlapping regions exist , a pointer to any
* of the regions is returned . Null is returned only when no overlapping
* region exists .
*/
static struct userspace_mem_region *
userspace_mem_region_find(struct kvm_vm *vm, uint64_t start, uint64_t end)
{
struct rb_node *node;
for (node = vm->regions.gpa_tree.rb_node; node; ) {
struct userspace_mem_region *region =
container_of(node, struct userspace_mem_region, gpa_node);
uint64_t existing_start = region->region.guest_phys_addr;
uint64_t existing_end = region->region.guest_phys_addr
+ region->region.memory_size - 1 ;
if (start <= existing_end && end >= existing_start)
return region;
if (start < existing_start)
node = node->rb_left;
else
node = node->rb_right;
}
return NULL;
}
static void kvm_stats_release(struct kvm_binary_stats *stats)
{
int ret;
if (stats->fd < 0 )
return ;
if (stats->desc) {
free(stats->desc);
stats->desc = NULL;
}
ret = close(stats->fd);
TEST_ASSERT(!ret, __KVM_SYSCALL_ERROR("close()" , ret));
stats->fd = -1 ;
}
__weak void vcpu_arch_free(struct kvm_vcpu *vcpu)
{
}
/*
* VM VCPU Remove
*
* Input Args :
* vcpu - VCPU to remove
*
* Output Args : None
*
* Return : None , TEST_ASSERT failures for all error conditions
*
* Removes a vCPU from a VM and frees its resources .
*/
static void vm_vcpu_rm(struct kvm_vm *vm, struct kvm_vcpu *vcpu)
{
int ret;
if (vcpu->dirty_gfns) {
ret = munmap(vcpu->dirty_gfns, vm->dirty_ring_size);
TEST_ASSERT(!ret, __KVM_SYSCALL_ERROR("munmap()" , ret));
vcpu->dirty_gfns = NULL;
}
ret = munmap(vcpu->run, vcpu_mmap_sz());
TEST_ASSERT(!ret, __KVM_SYSCALL_ERROR("munmap()" , ret));
ret = close(vcpu->fd);
TEST_ASSERT(!ret, __KVM_SYSCALL_ERROR("close()" , ret));
kvm_stats_release(&vcpu->stats);
list_del(&vcpu->list);
vcpu_arch_free(vcpu);
free(vcpu);
}
void kvm_vm_release(struct kvm_vm *vmp)
{
struct kvm_vcpu *vcpu, *tmp;
int ret;
list_for_each_entry_safe(vcpu, tmp, &vmp->vcpus, list)
vm_vcpu_rm(vmp, vcpu);
ret = close(vmp->fd);
TEST_ASSERT(!ret, __KVM_SYSCALL_ERROR("close()" , ret));
ret = close(vmp->kvm_fd);
TEST_ASSERT(!ret, __KVM_SYSCALL_ERROR("close()" , ret));
/* Free cached stats metadata and close FD */
kvm_stats_release(&vmp->stats);
}
static void __vm_mem_region_delete(struct kvm_vm *vm,
struct userspace_mem_region *region)
{
int ret;
rb_erase(®ion->gpa_node, &vm->regions.gpa_tree);
rb_erase(®ion->hva_node, &vm->regions.hva_tree);
hash_del(®ion->slot_node);
sparsebit_free(®ion->unused_phy_pages);
sparsebit_free(®ion->protected_phy_pages);
ret = munmap(region->mmap_start, region->mmap_size);
TEST_ASSERT(!ret, __KVM_SYSCALL_ERROR("munmap()" , ret));
if (region->fd >= 0 ) {
/* There's an extra map when using shared memory. */
ret = munmap(region->mmap_alias, region->mmap_size);
TEST_ASSERT(!ret, __KVM_SYSCALL_ERROR("munmap()" , ret));
close(region->fd);
}
if (region->region.guest_memfd >= 0 )
close(region->region.guest_memfd);
free(region);
}
/*
* Destroys and frees the VM pointed to by vmp .
*/
void kvm_vm_free(struct kvm_vm *vmp)
{
int ctr;
struct hlist_node *node;
struct userspace_mem_region *region;
if (vmp == NULL)
return ;
/* Free userspace_mem_regions. */
hash_for_each_safe(vmp->regions.slot_hash, ctr, node, region, slot_node)
__vm_mem_region_delete(vmp, region);
/* Free sparsebit arrays. */
sparsebit_free(&vmp->vpages_valid);
sparsebit_free(&vmp->vpages_mapped);
kvm_vm_release(vmp);
/* Free the structure describing the VM. */
free(vmp);
}
int kvm_memfd_alloc(size_t size, bool hugepages)
{
int memfd_flags = MFD_CLOEXEC;
int fd, r;
if (hugepages)
memfd_flags |= MFD_HUGETLB;
fd = memfd_create("kvm_selftest" , memfd_flags);
TEST_ASSERT(fd != -1 , __KVM_SYSCALL_ERROR("memfd_create()" , fd));
r = ftruncate(fd, size);
TEST_ASSERT(!r, __KVM_SYSCALL_ERROR("ftruncate()" , r));
r = fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 0 , size);
TEST_ASSERT(!r, __KVM_SYSCALL_ERROR("fallocate()" , r));
return fd;
}
static void vm_userspace_mem_region_gpa_insert(struct rb_root *gpa_tree,
struct userspace_mem_region *region)
{
struct rb_node **cur, *parent;
for (cur = &gpa_tree->rb_node, parent = NULL; *cur; ) {
struct userspace_mem_region *cregion;
cregion = container_of(*cur, typeof(*cregion), gpa_node);
parent = *cur;
if (region->region.guest_phys_addr <
cregion->region.guest_phys_addr)
cur = &(*cur)->rb_left;
else {
TEST_ASSERT(region->region.guest_phys_addr !=
cregion->region.guest_phys_addr,
"Duplicate GPA in region tree" );
cur = &(*cur)->rb_right;
}
}
rb_link_node(®ion->gpa_node, parent, cur);
rb_insert_color(®ion->gpa_node, gpa_tree);
}
static void vm_userspace_mem_region_hva_insert(struct rb_root *hva_tree,
struct userspace_mem_region *region)
{
struct rb_node **cur, *parent;
for (cur = &hva_tree->rb_node, parent = NULL; *cur; ) {
struct userspace_mem_region *cregion;
cregion = container_of(*cur, typeof(*cregion), hva_node);
parent = *cur;
if (region->host_mem < cregion->host_mem)
cur = &(*cur)->rb_left;
else {
TEST_ASSERT(region->host_mem !=
cregion->host_mem,
"Duplicate HVA in region tree" );
cur = &(*cur)->rb_right;
}
}
rb_link_node(®ion->hva_node, parent, cur);
rb_insert_color(®ion->hva_node, hva_tree);
}
int __vm_set_user_memory_region(struct kvm_vm *vm, uint32_t slot, uint32_t flags,
uint64_t gpa, uint64_t size, void *hva)
{
struct kvm_userspace_memory_region region = {
.slot = slot,
.flags = flags,
.guest_phys_addr = gpa,
.memory_size = size,
.userspace_addr = (uintptr_t)hva,
};
return ioctl(vm->fd, KVM_SET_USER_MEMORY_REGION, ®ion);
}
void vm_set_user_memory_region(struct kvm_vm *vm, uint32_t slot, uint32_t flags,
uint64_t gpa, uint64_t size, void *hva)
{
int ret = __vm_set_user_memory_region(vm, slot, flags, gpa, size, hva);
TEST_ASSERT(!ret, "KVM_SET_USER_MEMORY_REGION failed, errno = %d (%s)" ,
errno, strerror(errno));
}
#define TEST_REQUIRE_SET_USER_MEMORY_REGION2() \
__TEST_REQUIRE(kvm_has_cap(KVM_CAP_USER_MEMORY2), \
"KVM selftests now require KVM_SET_USER_MEMORY_REGION2 (introduced in v6.8)" )
int __vm_set_user_memory_region2(struct kvm_vm *vm, uint32_t slot, uint32_t flags,
uint64_t gpa, uint64_t size, void *hva,
uint32_t guest_memfd, uint64_t guest_memfd_offset)
{
struct kvm_userspace_memory_region2 region = {
.slot = slot,
.flags = flags,
.guest_phys_addr = gpa,
.memory_size = size,
.userspace_addr = (uintptr_t)hva,
.guest_memfd = guest_memfd,
.guest_memfd_offset = guest_memfd_offset,
};
TEST_REQUIRE_SET_USER_MEMORY_REGION2();
return ioctl(vm->fd, KVM_SET_USER_MEMORY_REGION2, ®ion);
}
void vm_set_user_memory_region2(struct kvm_vm *vm, uint32_t slot, uint32_t flags,
uint64_t gpa, uint64_t size, void *hva,
uint32_t guest_memfd, uint64_t guest_memfd_offset)
{
int ret = __vm_set_user_memory_region2(vm, slot, flags, gpa, size, hva,
guest_memfd, guest_memfd_offset);
TEST_ASSERT(!ret, "KVM_SET_USER_MEMORY_REGION2 failed, errno = %d (%s)" ,
errno, strerror(errno));
}
/* FIXME: This thing needs to be ripped apart and rewritten. */
void vm_mem_add(struct kvm_vm *vm, enum vm_mem_backing_src_type src_type,
uint64_t guest_paddr, uint32_t slot, uint64_t npages,
uint32_t flags, int guest_memfd, uint64_t guest_memfd_offset)
{
int ret;
struct userspace_mem_region *region;
size_t backing_src_pagesz = get_backing_src_pagesz(src_type);
size_t mem_size = npages * vm->page_size;
size_t alignment;
TEST_REQUIRE_SET_USER_MEMORY_REGION2();
TEST_ASSERT(vm_adjust_num_guest_pages(vm->mode, npages) == npages,
"Number of guest pages is not compatible with the host. "
"Try npages=%d" , vm_adjust_num_guest_pages(vm->mode, npages));
TEST_ASSERT((guest_paddr % vm->page_size) == 0 , "Guest physical "
"address not on a page boundary.\n"
" guest_paddr: 0x%lx vm->page_size: 0x%x" ,
guest_paddr, vm->page_size);
TEST_ASSERT((((guest_paddr >> vm->page_shift) + npages) - 1 )
<= vm->max_gfn, "Physical range beyond maximum "
"supported physical address,\n"
" guest_paddr: 0x%lx npages: 0x%lx\n"
" vm->max_gfn: 0x%lx vm->page_size: 0x%x" ,
guest_paddr, npages, vm->max_gfn, vm->page_size);
/*
* Confirm a mem region with an overlapping address doesn ' t
* already exist .
*/
region = (struct userspace_mem_region *) userspace_mem_region_find(
vm, guest_paddr, (guest_paddr + npages * vm->page_size) - 1 );
if (region != NULL)
TEST_FAIL("overlapping userspace_mem_region already "
"exists\n"
" requested guest_paddr: 0x%lx npages: 0x%lx "
"page_size: 0x%x\n"
" existing guest_paddr: 0x%lx size: 0x%lx" ,
guest_paddr, npages, vm->page_size,
(uint64_t) region->region.guest_phys_addr,
(uint64_t) region->region.memory_size);
/* Confirm no region with the requested slot already exists. */
hash_for_each_possible(vm->regions.slot_hash, region, slot_node,
slot) {
if (region->region.slot != slot)
continue ;
TEST_FAIL("A mem region with the requested slot "
"already exists.\n"
" requested slot: %u paddr: 0x%lx npages: 0x%lx\n"
" existing slot: %u paddr: 0x%lx size: 0x%lx" ,
slot, guest_paddr, npages,
region->region.slot,
(uint64_t) region->region.guest_phys_addr,
(uint64_t) region->region.memory_size);
}
/* Allocate and initialize new mem region structure. */
region = calloc(1 , sizeof (*region));
TEST_ASSERT(region != NULL, "Insufficient Memory" );
region->mmap_size = mem_size;
#ifdef __s390x__
/* On s390x, the host address must be aligned to 1M (due to PGSTEs) */
alignment = 0 x100000;
#else
alignment = 1 ;
#endif
/*
* When using THP mmap is not guaranteed to returned a hugepage aligned
* address so we have to pad the mmap . Padding is not needed for HugeTLB
* because mmap will always return an address aligned to the HugeTLB
* page size .
*/
if (src_type == VM_MEM_SRC_ANONYMOUS_THP)
alignment = max(backing_src_pagesz, alignment);
TEST_ASSERT_EQ(guest_paddr, align_up(guest_paddr, backing_src_pagesz));
/* Add enough memory to align up if necessary */
if (alignment > 1 )
region->mmap_size += alignment;
region->fd = -1 ;
if (backing_src_is_shared(src_type))
region->fd = kvm_memfd_alloc(region->mmap_size,
src_type == VM_MEM_SRC_SHARED_HUGETLB);
region->mmap_start = mmap(NULL, region->mmap_size,
PROT_READ | PROT_WRITE,
vm_mem_backing_src_alias(src_type)->flag,
region->fd, 0 );
TEST_ASSERT(region->mmap_start != MAP_FAILED,
__KVM_SYSCALL_ERROR("mmap()" , (int )(unsigned long )MAP_FAILED));
TEST_ASSERT(!is_backing_src_hugetlb(src_type) ||
region->mmap_start == align_ptr_up(region->mmap_start, backing_src_pagesz),
"mmap_start %p is not aligned to HugeTLB page size 0x%lx" ,
region->mmap_start, backing_src_pagesz);
/* Align host address */
region->host_mem = align_ptr_up(region->mmap_start, alignment);
/* As needed perform madvise */
if ((src_type == VM_MEM_SRC_ANONYMOUS ||
src_type == VM_MEM_SRC_ANONYMOUS_THP) && thp_configured()) {
ret = madvise(region->host_mem, mem_size,
src_type == VM_MEM_SRC_ANONYMOUS ? MADV_NOHUGEPAGE : MADV_HUGEPAGE);
TEST_ASSERT(ret == 0 , "madvise failed, addr: %p length: 0x%lx src_type: %s" ,
region->host_mem, mem_size,
vm_mem_backing_src_alias(src_type)->name);
}
region->backing_src_type = src_type;
if (flags & KVM_MEM_GUEST_MEMFD) {
if (guest_memfd < 0 ) {
uint32_t guest_memfd_flags = 0 ;
TEST_ASSERT(!guest_memfd_offset,
"Offset must be zero when creating new guest_memfd" );
guest_memfd = vm_create_guest_memfd(vm, mem_size, guest_memfd_flags);
} else {
/*
* Install a unique fd for each memslot so that the fd
* can be closed when the region is deleted without
* needing to track if the fd is owned by the framework
* or by the caller .
*/
guest_memfd = dup(guest_memfd);
TEST_ASSERT(guest_memfd >= 0 , __KVM_SYSCALL_ERROR("dup()" , guest_memfd));
}
region->region.guest_memfd = guest_memfd;
region->region.guest_memfd_offset = guest_memfd_offset;
} else {
region->region.guest_memfd = -1 ;
}
region->unused_phy_pages = sparsebit_alloc();
if (vm_arch_has_protected_memory(vm))
region->protected_phy_pages = sparsebit_alloc();
sparsebit_set_num(region->unused_phy_pages,
guest_paddr >> vm->page_shift, npages);
region->region.slot = slot;
region->region.flags = flags;
region->region.guest_phys_addr = guest_paddr;
region->region.memory_size = npages * vm->page_size;
region->region.userspace_addr = (uintptr_t) region->host_mem;
ret = __vm_ioctl(vm, KVM_SET_USER_MEMORY_REGION2, ®ion->region);
TEST_ASSERT(ret == 0 , "KVM_SET_USER_MEMORY_REGION2 IOCTL failed,\n"
" rc: %i errno: %i\n"
" slot: %u flags: 0x%x\n"
" guest_phys_addr: 0x%lx size: 0x%lx guest_memfd: %d" ,
ret, errno, slot, flags,
guest_paddr, (uint64_t) region->region.memory_size,
region->region.guest_memfd);
/* Add to quick lookup data structures */
vm_userspace_mem_region_gpa_insert(&vm->regions.gpa_tree, region);
vm_userspace_mem_region_hva_insert(&vm->regions.hva_tree, region);
hash_add(vm->regions.slot_hash, ®ion->slot_node, slot);
/* If shared memory, create an alias. */
if (region->fd >= 0 ) {
region->mmap_alias = mmap(NULL, region->mmap_size,
PROT_READ | PROT_WRITE,
vm_mem_backing_src_alias(src_type)->flag,
region->fd, 0 );
TEST_ASSERT(region->mmap_alias != MAP_FAILED,
__KVM_SYSCALL_ERROR("mmap()" , (int )(unsigned long )MAP_FAILED));
/* Align host alias address */
region->host_alias = align_ptr_up(region->mmap_alias, alignment);
}
}
void vm_userspace_mem_region_add(struct kvm_vm *vm,
enum vm_mem_backing_src_type src_type,
uint64_t guest_paddr, uint32_t slot,
uint64_t npages, uint32_t flags)
{
vm_mem_add(vm, src_type, guest_paddr, slot, npages, flags, -1 , 0 );
}
/*
* Memslot to region
*
* Input Args :
* vm - Virtual Machine
* memslot - KVM memory slot ID
*
* Output Args : None
*
* Return :
* Pointer to memory region structure that describe memory region
* using kvm memory slot ID given by memslot . TEST_ASSERT failure
* on error ( e . g . currently no memory region using memslot as a KVM
* memory slot ID ) .
*/
struct userspace_mem_region *
memslot2region(struct kvm_vm *vm, uint32_t memslot)
{
struct userspace_mem_region *region;
hash_for_each_possible(vm->regions.slot_hash, region, slot_node,
memslot)
if (region->region.slot == memslot)
return region;
fprintf(stderr, "No mem region with the requested slot found,\n"
" requested slot: %u\n" , memslot);
fputs("---- vm dump ----\n" , stderr);
vm_dump(stderr, vm, 2 );
TEST_FAIL("Mem region not found" );
return NULL;
}
/*
* VM Memory Region Flags Set
*
* Input Args :
* vm - Virtual Machine
* flags - Starting guest physical address
*
* Output Args : None
*
* Return : None
*
* Sets the flags of the memory region specified by the value of slot ,
* to the values given by flags .
*/
void vm_mem_region_set_flags(struct kvm_vm *vm, uint32_t slot, uint32_t flags)
{
int ret;
struct userspace_mem_region *region;
region = memslot2region(vm, slot);
region->region.flags = flags;
ret = __vm_ioctl(vm, KVM_SET_USER_MEMORY_REGION2, ®ion->region);
TEST_ASSERT(ret == 0 , "KVM_SET_USER_MEMORY_REGION2 IOCTL failed,\n"
" rc: %i errno: %i slot: %u flags: 0x%x" ,
ret, errno, slot, flags);
}
/*
* VM Memory Region Move
*
* Input Args :
* vm - Virtual Machine
* slot - Slot of the memory region to move
* new_gpa - Starting guest physical address
*
* Output Args : None
*
* Return : None
*
* Change the gpa of a memory region .
*/
void vm_mem_region_move(struct kvm_vm *vm, uint32_t slot, uint64_t new_gpa)
{
struct userspace_mem_region *region;
int ret;
region = memslot2region(vm, slot);
region->region.guest_phys_addr = new_gpa;
ret = __vm_ioctl(vm, KVM_SET_USER_MEMORY_REGION2, ®ion->region);
TEST_ASSERT(!ret, "KVM_SET_USER_MEMORY_REGION2 failed\n"
"ret: %i errno: %i slot: %u new_gpa: 0x%lx" ,
ret, errno, slot, new_gpa);
}
/*
* VM Memory Region Delete
*
* Input Args :
* vm - Virtual Machine
* slot - Slot of the memory region to delete
*
* Output Args : None
*
* Return : None
*
* Delete a memory region .
*/
void vm_mem_region_delete(struct kvm_vm *vm, uint32_t slot)
{
struct userspace_mem_region *region = memslot2region(vm, slot);
region->region.memory_size = 0 ;
vm_ioctl(vm, KVM_SET_USER_MEMORY_REGION2, ®ion->region);
__vm_mem_region_delete(vm, region);
}
void vm_guest_mem_fallocate(struct kvm_vm *vm, uint64_t base, uint64_t size,
bool punch_hole)
{
const int mode = FALLOC_FL_KEEP_SIZE | (punch_hole ? FALLOC_FL_PUNCH_HOLE : 0 );
struct userspace_mem_region *region;
uint64_t end = base + size;
uint64_t gpa, len;
off_t fd_offset;
int ret;
for (gpa = base; gpa < end; gpa += len) {
uint64_t offset;
region = userspace_mem_region_find(vm, gpa, gpa);
TEST_ASSERT(region && region->region.flags & KVM_MEM_GUEST_MEMFD,
"Private memory region not found for GPA 0x%lx" , gpa);
offset = gpa - region->region.guest_phys_addr;
fd_offset = region->region.guest_memfd_offset + offset;
len = min_t(uint64_t, end - gpa, region->region.memory_size - offset);
ret = fallocate(region->region.guest_memfd, mode, fd_offset, len);
TEST_ASSERT(!ret, "fallocate() failed to %s at %lx (len = %lu), fd = %d, mode = %x, offset = %lx" ,
punch_hole ? "punch hole" : "allocate" , gpa, len,
region->region.guest_memfd, mode, fd_offset);
}
}
/* Returns the size of a vCPU's kvm_run structure. */
static int vcpu_mmap_sz(void )
{
int dev_fd, ret;
dev_fd = open_kvm_dev_path_or_exit();
ret = ioctl(dev_fd, KVM_GET_VCPU_MMAP_SIZE, NULL);
TEST_ASSERT(ret >= sizeof (struct kvm_run),
KVM_IOCTL_ERROR(KVM_GET_VCPU_MMAP_SIZE, ret));
close(dev_fd);
return ret;
}
static bool vcpu_exists(struct kvm_vm *vm, uint32_t vcpu_id)
{
struct kvm_vcpu *vcpu;
list_for_each_entry(vcpu, &vm->vcpus, list) {
if (vcpu->id == vcpu_id)
return true ;
}
return false ;
}
/*
* Adds a virtual CPU to the VM specified by vm with the ID given by vcpu_id .
* No additional vCPU setup is done . Returns the vCPU .
*/
struct kvm_vcpu *__vm_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id)
{
struct kvm_vcpu *vcpu;
/* Confirm a vcpu with the specified id doesn't already exist. */
TEST_ASSERT(!vcpu_exists(vm, vcpu_id), "vCPU%d already exists" , vcpu_id);
/* Allocate and initialize new vcpu structure. */
vcpu = calloc(1 , sizeof (*vcpu));
TEST_ASSERT(vcpu != NULL, "Insufficient Memory" );
vcpu->vm = vm;
vcpu->id = vcpu_id;
vcpu->fd = __vm_ioctl(vm, KVM_CREATE_VCPU, (void *)(unsigned long )vcpu_id);
TEST_ASSERT_VM_VCPU_IOCTL(vcpu->fd >= 0 , KVM_CREATE_VCPU, vcpu->fd, vm);
TEST_ASSERT(vcpu_mmap_sz() >= sizeof (*vcpu->run), "vcpu mmap size "
"smaller than expected, vcpu_mmap_sz: %i expected_min: %zi" ,
vcpu_mmap_sz(), sizeof (*vcpu->run));
vcpu->run = (struct kvm_run *) mmap(NULL, vcpu_mmap_sz(),
PROT_READ | PROT_WRITE, MAP_SHARED, vcpu->fd, 0 );
TEST_ASSERT(vcpu->run != MAP_FAILED,
__KVM_SYSCALL_ERROR("mmap()" , (int )(unsigned long )MAP_FAILED));
if (kvm_has_cap(KVM_CAP_BINARY_STATS_FD))
vcpu->stats.fd = vcpu_get_stats_fd(vcpu);
else
vcpu->stats.fd = -1 ;
/* Add to linked-list of VCPUs. */
list_add(&vcpu->list, &vm->vcpus);
return vcpu;
}
/*
* VM Virtual Address Unused Gap
*
* Input Args :
* vm - Virtual Machine
* sz - Size ( bytes )
* vaddr_min - Minimum Virtual Address
*
* Output Args : None
*
* Return :
* Lowest virtual address at or below vaddr_min , with at least
* sz unused bytes . TEST_ASSERT failure if no area of at least
* size sz is available .
*
* Within the VM specified by vm , locates the lowest starting virtual
* address > = vaddr_min , that has at least sz unallocated bytes . A
* TEST_ASSERT failure occurs for invalid input or no area of at least
* sz unallocated bytes > = vaddr_min is available .
*/
vm_vaddr_t vm_vaddr_unused_gap(struct kvm_vm *vm, size_t sz,
vm_vaddr_t vaddr_min)
{
uint64_t pages = (sz + vm->page_size - 1 ) >> vm->page_shift;
/* Determine lowest permitted virtual page index. */
uint64_t pgidx_start = (vaddr_min + vm->page_size - 1 ) >> vm->page_shift;
if ((pgidx_start * vm->page_size) < vaddr_min)
goto no_va_found;
/* Loop over section with enough valid virtual page indexes. */
if (!sparsebit_is_set_num(vm->vpages_valid,
pgidx_start, pages))
pgidx_start = sparsebit_next_set_num(vm->vpages_valid,
pgidx_start, pages);
do {
/*
* Are there enough unused virtual pages available at
* the currently proposed starting virtual page index .
* If not , adjust proposed starting index to next
* possible .
*/
if (sparsebit_is_clear_num(vm->vpages_mapped,
pgidx_start, pages))
goto va_found;
pgidx_start = sparsebit_next_clear_num(vm->vpages_mapped,
pgidx_start, pages);
if (pgidx_start == 0 )
goto no_va_found;
/*
* If needed , adjust proposed starting virtual address ,
* to next range of valid virtual addresses .
*/
if (!sparsebit_is_set_num(vm->vpages_valid,
pgidx_start, pages)) {
pgidx_start = sparsebit_next_set_num(
vm->vpages_valid, pgidx_start, pages);
if (pgidx_start == 0 )
goto no_va_found;
}
} while (pgidx_start != 0 );
no_va_found:
TEST_FAIL("No vaddr of specified pages available, pages: 0x%lx" , pages);
/* NOT REACHED */
return -1 ;
va_found:
TEST_ASSERT(sparsebit_is_set_num(vm->vpages_valid,
pgidx_start, pages),
"Unexpected, invalid virtual page index range,\n"
" pgidx_start: 0x%lx\n"
" pages: 0x%lx" ,
pgidx_start, pages);
TEST_ASSERT(sparsebit_is_clear_num(vm->vpages_mapped,
pgidx_start, pages),
"Unexpected, pages already mapped,\n"
" pgidx_start: 0x%lx\n"
" pages: 0x%lx" ,
pgidx_start, pages);
return pgidx_start * vm->page_size;
}
static vm_vaddr_t ____vm_vaddr_alloc(struct kvm_vm *vm, size_t sz,
vm_vaddr_t vaddr_min,
enum kvm_mem_region_type type,
bool protected )
{
uint64_t pages = (sz >> vm->page_shift) + ((sz % vm->page_size) != 0 );
virt_pgd_alloc(vm);
vm_paddr_t paddr = __vm_phy_pages_alloc(vm, pages,
KVM_UTIL_MIN_PFN * vm->page_size,
vm->memslots[type], protected );
/*
* Find an unused range of virtual page addresses of at least
* pages in length .
*/
vm_vaddr_t vaddr_start = vm_vaddr_unused_gap(vm, sz, vaddr_min);
/* Map the virtual pages. */
for (vm_vaddr_t vaddr = vaddr_start; pages > 0 ;
pages--, vaddr += vm->page_size, paddr += vm->page_size) {
virt_pg_map(vm, vaddr, paddr);
sparsebit_set(vm->vpages_mapped, vaddr >> vm->page_shift);
}
return vaddr_start;
}
vm_vaddr_t __vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min,
enum kvm_mem_region_type type)
{
return ____vm_vaddr_alloc(vm, sz, vaddr_min, type,
vm_arch_has_protected_memory(vm));
}
vm_vaddr_t vm_vaddr_alloc_shared(struct kvm_vm *vm, size_t sz,
vm_vaddr_t vaddr_min,
enum kvm_mem_region_type type)
{
return ____vm_vaddr_alloc(vm, sz, vaddr_min, type, false );
}
/*
* VM Virtual Address Allocate
*
* Input Args :
* vm - Virtual Machine
* sz - Size in bytes
* vaddr_min - Minimum starting virtual address
*
* Output Args : None
*
* Return :
* Starting guest virtual address
*
* Allocates at least sz bytes within the virtual address space of the vm
* given by vm . The allocated bytes are mapped to a virtual address > =
* the address given by vaddr_min . Note that each allocation uses a
* a unique set of pages , with the minimum real allocation being at least
* a page . The allocated physical space comes from the TEST_DATA memory region .
*/
vm_vaddr_t vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min)
{
return __vm_vaddr_alloc(vm, sz, vaddr_min, MEM_REGION_TEST_DATA);
}
/*
* VM Virtual Address Allocate Pages
*
* Input Args :
* vm - Virtual Machine
*
* Output Args : None
*
* Return :
* Starting guest virtual address
*
* Allocates at least N system pages worth of bytes within the virtual address
* space of the vm .
*/
vm_vaddr_t vm_vaddr_alloc_pages(struct kvm_vm *vm, int nr_pages)
{
return vm_vaddr_alloc(vm, nr_pages * getpagesize(), KVM_UTIL_MIN_VADDR);
}
vm_vaddr_t __vm_vaddr_alloc_page(struct kvm_vm *vm, enum kvm_mem_region_type type)
{
return __vm_vaddr_alloc(vm, getpagesize(), KVM_UTIL_MIN_VADDR, type);
}
/*
* VM Virtual Address Allocate Page
*
* Input Args :
* vm - Virtual Machine
*
* Output Args : None
*
* Return :
* Starting guest virtual address
*
* Allocates at least one system page worth of bytes within the virtual address
* space of the vm .
*/
vm_vaddr_t vm_vaddr_alloc_page(struct kvm_vm *vm)
{
return vm_vaddr_alloc_pages(vm, 1 );
}
/*
* Map a range of VM virtual address to the VM ' s physical address
*
* Input Args :
* vm - Virtual Machine
* vaddr - Virtuall address to map
* paddr - VM Physical Address
* npages - The number of pages to map
*
* Output Args : None
*
* Return : None
*
* Within the VM given by @ vm , creates a virtual translation for
* @ npages starting at @ vaddr to the page range starting at @ paddr .
*/
void virt_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr,
unsigned int npages)
{
size_t page_size = vm->page_size;
size_t size = npages * page_size;
TEST_ASSERT(vaddr + size > vaddr, "Vaddr overflow" );
TEST_ASSERT(paddr + size > paddr, "Paddr overflow" );
while (npages--) {
virt_pg_map(vm, vaddr, paddr);
sparsebit_set(vm->vpages_mapped, vaddr >> vm->page_shift);
vaddr += page_size;
paddr += page_size;
}
}
/*
* Address VM Physical to Host Virtual
*
* Input Args :
* vm - Virtual Machine
* gpa - VM physical address
*
* Output Args : None
*
* Return :
* Equivalent host virtual address
*
* Locates the memory region containing the VM physical address given
* by gpa , within the VM given by vm . When found , the host virtual
* address providing the memory to the vm physical address is returned .
* A TEST_ASSERT failure occurs if no region containing gpa exists .
*/
void *addr_gpa2hva(struct kvm_vm *vm, vm_paddr_t gpa)
{
struct userspace_mem_region *region;
gpa = vm_untag_gpa(vm, gpa);
region = userspace_mem_region_find(vm, gpa, gpa);
if (!region) {
TEST_FAIL("No vm physical memory at 0x%lx" , gpa);
return NULL;
}
return (void *)((uintptr_t)region->host_mem
+ (gpa - region->region.guest_phys_addr));
}
/*
* Address Host Virtual to VM Physical
*
* Input Args :
* vm - Virtual Machine
* hva - Host virtual address
*
* Output Args : None
*
* Return :
* Equivalent VM physical address
*
* Locates the memory region containing the host virtual address given
* by hva , within the VM given by vm . When found , the equivalent
* VM physical address is returned . A TEST_ASSERT failure occurs if no
* region containing hva exists .
*/
vm_paddr_t addr_hva2gpa(struct kvm_vm *vm, void *hva)
{
struct rb_node *node;
for (node = vm->regions.hva_tree.rb_node; node; ) {
struct userspace_mem_region *region =
container_of(node, struct userspace_mem_region, hva_node);
if (hva >= region->host_mem) {
if (hva <= (region->host_mem
+ region->region.memory_size - 1 ))
return (vm_paddr_t)((uintptr_t)
region->region.guest_phys_addr
+ (hva - (uintptr_t)region->host_mem));
node = node->rb_right;
} else
node = node->rb_left;
}
TEST_FAIL("No mapping to a guest physical address, hva: %p" , hva);
return -1 ;
}
/*
* Address VM physical to Host Virtual * alias * .
*
* Input Args :
* vm - Virtual Machine
* gpa - VM physical address
*
* Output Args : None
*
* Return :
* Equivalent address within the host virtual * alias * area , or NULL
* ( without failing the test ) if the guest memory is not shared ( so
* no alias exists ) .
*
* Create a writable , shared virtual = > physical alias for the specific GPA .
* The primary use case is to allow the host selftest to manipulate guest
* memory without mapping said memory in the guest ' s address space . And , for
* userfaultfd - based demand paging , to do so without triggering userfaults .
*/
void *addr_gpa2alias(struct kvm_vm *vm, vm_paddr_t gpa)
{
struct userspace_mem_region *region;
uintptr_t offset;
region = userspace_mem_region_find(vm, gpa, gpa);
if (!region)
return NULL;
if (!region->host_alias)
return NULL;
offset = gpa - region->region.guest_phys_addr;
return (void *) ((uintptr_t) region->host_alias + offset);
}
/* Create an interrupt controller chip for the specified VM. */
void vm_create_irqchip(struct kvm_vm *vm)
{
int r;
/*
* Allocate a fully in - kernel IRQ chip by default , but fall back to a
* split model ( x86 only ) if that fails ( KVM x86 allows compiling out
* support for KVM_CREATE_IRQCHIP ) .
*/
r = __vm_ioctl(vm, KVM_CREATE_IRQCHIP, NULL);
if (r && errno == ENOTTY && kvm_has_cap(KVM_CAP_SPLIT_IRQCHIP))
vm_enable_cap(vm, KVM_CAP_SPLIT_IRQCHIP, 24 );
else
TEST_ASSERT_VM_VCPU_IOCTL(!r, KVM_CREATE_IRQCHIP, r, vm);
vm->has_irqchip = true ;
}
int _vcpu_run(struct kvm_vcpu *vcpu)
{
int rc;
do {
rc = __vcpu_run(vcpu);
} while (rc == -1 && errno == EINTR);
if (!rc)
assert_on_unhandled_exception(vcpu);
return rc;
}
/*
* Invoke KVM_RUN on a vCPU until KVM returns something other than - EINTR .
* Assert if the KVM returns an error ( other than - EINTR ) .
*/
void vcpu_run(struct kvm_vcpu *vcpu)
{
int ret = _vcpu_run(vcpu);
TEST_ASSERT(!ret, KVM_IOCTL_ERROR(KVM_RUN, ret));
}
void vcpu_run_complete_io(struct kvm_vcpu *vcpu)
{
int ret;
vcpu->run->immediate_exit = 1 ;
ret = __vcpu_run(vcpu);
vcpu->run->immediate_exit = 0 ;
TEST_ASSERT(ret == -1 && errno == EINTR,
"KVM_RUN IOCTL didn't exit immediately, rc: %i, errno: %i" ,
ret, errno);
}
/*
* Get the list of guest registers which are supported for
* KVM_GET_ONE_REG / KVM_SET_ONE_REG ioctls . Returns a kvm_reg_list pointer ,
* it is the caller ' s responsibility to free the list .
*/
struct kvm_reg_list *vcpu_get_reg_list(struct kvm_vcpu *vcpu)
{
struct kvm_reg_list reg_list_n = { .n = 0 }, *reg_list;
int ret;
ret = __vcpu_ioctl(vcpu, KVM_GET_REG_LIST, ®_list_n);
TEST_ASSERT(ret == -1 && errno == E2BIG, "KVM_GET_REG_LIST n=0" );
reg_list = calloc(1 , sizeof (*reg_list) + reg_list_n.n * sizeof (__u64));
reg_list->n = reg_list_n.n;
vcpu_ioctl(vcpu, KVM_GET_REG_LIST, reg_list);
return reg_list;
}
void *vcpu_map_dirty_ring(struct kvm_vcpu *vcpu)
{
uint32_t page_size = getpagesize();
uint32_t size = vcpu->vm->dirty_ring_size;
TEST_ASSERT(size > 0 , "Should enable dirty ring first" );
if (!vcpu->dirty_gfns) {
void *addr;
addr = mmap(NULL, size, PROT_READ, MAP_PRIVATE, vcpu->fd,
page_size * KVM_DIRTY_LOG_PAGE_OFFSET);
TEST_ASSERT(addr == MAP_FAILED, "Dirty ring mapped private" );
addr = mmap(NULL, size, PROT_READ | PROT_EXEC, MAP_PRIVATE, vcpu->fd,
page_size * KVM_DIRTY_LOG_PAGE_OFFSET);
TEST_ASSERT(addr == MAP_FAILED, "Dirty ring mapped exec" );
addr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, vcpu->fd,
page_size * KVM_DIRTY_LOG_PAGE_OFFSET);
TEST_ASSERT(addr != MAP_FAILED, "Dirty ring map failed" );
vcpu->dirty_gfns = addr;
vcpu->dirty_gfns_count = size / sizeof (struct kvm_dirty_gfn);
}
return vcpu->dirty_gfns;
}
/*
* Device Ioctl
*/
int __kvm_has_device_attr(int dev_fd, uint32_t group, uint64_t attr)
{
struct kvm_device_attr attribute = {
.group = group,
.attr = attr,
.flags = 0 ,
};
return ioctl(dev_fd, KVM_HAS_DEVICE_ATTR, &attribute);
}
int __kvm_test_create_device(struct kvm_vm *vm, uint64_t type)
{
struct kvm_create_device create_dev = {
.type = type,
.flags = KVM_CREATE_DEVICE_TEST,
};
return __vm_ioctl(vm, KVM_CREATE_DEVICE, &create_dev);
}
int __kvm_create_device(struct kvm_vm *vm, uint64_t type)
{
struct kvm_create_device create_dev = {
.type = type,
.fd = -1 ,
.flags = 0 ,
};
int err;
err = __vm_ioctl(vm, KVM_CREATE_DEVICE, &create_dev);
TEST_ASSERT(err <= 0 , "KVM_CREATE_DEVICE shouldn't return a positive value" );
return err ? : create_dev.fd;
}
int __kvm_device_attr_get(int dev_fd, uint32_t group, uint64_t attr, void *val)
{
struct kvm_device_attr kvmattr = {
.group = group,
.attr = attr,
.flags = 0 ,
.addr = (uintptr_t)val,
};
return __kvm_ioctl(dev_fd, KVM_GET_DEVICE_ATTR, &kvmattr);
}
int __kvm_device_attr_set(int dev_fd, uint32_t group, uint64_t attr, void *val)
{
struct kvm_device_attr kvmattr = {
.group = group,
.attr = attr,
.flags = 0 ,
.addr = (uintptr_t)val,
};
return __kvm_ioctl(dev_fd, KVM_SET_DEVICE_ATTR, &kvmattr);
}
/*
* IRQ related functions .
*/
int _kvm_irq_line(struct kvm_vm *vm, uint32_t irq, int level)
{
struct kvm_irq_level irq_level = {
.irq = irq,
.level = level,
};
return __vm_ioctl(vm, KVM_IRQ_LINE, &irq_level);
}
void kvm_irq_line(struct kvm_vm *vm, uint32_t irq, int level)
{
int ret = _kvm_irq_line(vm, irq, level);
TEST_ASSERT(ret >= 0 , KVM_IOCTL_ERROR(KVM_IRQ_LINE, ret));
}
struct kvm_irq_routing *kvm_gsi_routing_create(void )
{
struct kvm_irq_routing *routing;
size_t size;
size = sizeof (struct kvm_irq_routing);
/* Allocate space for the max number of entries: this wastes 196 KBs. */
size += KVM_MAX_IRQ_ROUTES * sizeof (struct kvm_irq_routing_entry);
routing = calloc(1 , size);
assert(routing);
return routing;
}
void kvm_gsi_routing_irqchip_add(struct kvm_irq_routing *routing,
uint32_t gsi, uint32_t pin)
{
int i;
assert(routing);
assert(routing->nr < KVM_MAX_IRQ_ROUTES);
i = routing->nr;
routing->entries[i].gsi = gsi;
routing->entries[i].type = KVM_IRQ_ROUTING_IRQCHIP;
routing->entries[i].flags = 0 ;
routing->entries[i].u.irqchip.irqchip = 0 ;
routing->entries[i].u.irqchip.pin = pin;
routing->nr++;
}
int _kvm_gsi_routing_write(struct kvm_vm *vm, struct kvm_irq_routing *routing)
{
int ret;
assert(routing);
ret = __vm_ioctl(vm, KVM_SET_GSI_ROUTING, routing);
free(routing);
return ret;
}
void kvm_gsi_routing_write(struct kvm_vm *vm, struct kvm_irq_routing *routing)
{
int ret;
ret = _kvm_gsi_routing_write(vm, routing);
TEST_ASSERT(!ret, KVM_IOCTL_ERROR(KVM_SET_GSI_ROUTING, ret));
}
/*
* VM Dump
*
* Input Args :
* vm - Virtual Machine
* indent - Left margin indent amount
*
* Output Args :
* stream - Output FILE stream
*
* Return : None
*
* Dumps the current state of the VM given by vm , to the FILE stream
* given by stream .
*/
void vm_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent)
{
int ctr;
struct userspace_mem_region *region;
struct kvm_vcpu *vcpu;
fprintf(stream, "%*smode: 0x%x\n" , indent, "" , vm->mode);
fprintf(stream, "%*sfd: %i\n" , indent, "" , vm->fd);
fprintf(stream, "%*spage_size: 0x%x\n" , indent, "" , vm->page_size);
fprintf(stream, "%*sMem Regions:\n" , indent, "" );
hash_for_each(vm->regions.slot_hash, ctr, region, slot_node) {
fprintf(stream, "%*sguest_phys: 0x%lx size: 0x%lx "
"host_virt: %p\n" , indent + 2 , "" ,
(uint64_t) region->region.guest_phys_addr,
(uint64_t) region->region.memory_size,
region->host_mem);
fprintf(stream, "%*sunused_phy_pages: " , indent + 2 , "" );
sparsebit_dump(stream, region->unused_phy_pages, 0 );
if (region->protected_phy_pages) {
fprintf(stream, "%*sprotected_phy_pages: " , indent + 2 , "" );
sparsebit_dump(stream, region->protected_phy_pages, 0 );
}
}
fprintf(stream, "%*sMapped Virtual Pages:\n" , indent, "" );
sparsebit_dump(stream, vm->vpages_mapped, indent + 2 );
fprintf(stream, "%*spgd_created: %u\n" , indent, "" ,
vm->pgd_created);
if (vm->pgd_created) {
fprintf(stream, "%*sVirtual Translation Tables:\n" ,
indent + 2 , "" );
virt_dump(stream, vm, indent + 4 );
}
fprintf(stream, "%*sVCPUs:\n" , indent, "" );
list_for_each_entry(vcpu, &vm->vcpus, list)
vcpu_dump(stream, vcpu, indent + 2 );
}
#define KVM_EXIT_STRING(x) {KVM_EXIT_## x, #x }
/* Known KVM exit reasons */
static struct exit_reason {
unsigned int reason;
const char *name;
} exit_reasons_known[] = {
KVM_EXIT_STRING(UNKNOWN),
KVM_EXIT_STRING(EXCEPTION),
KVM_EXIT_STRING(IO),
KVM_EXIT_STRING(HYPERCALL),
KVM_EXIT_STRING(DEBUG),
KVM_EXIT_STRING(HLT),
KVM_EXIT_STRING(MMIO),
KVM_EXIT_STRING(IRQ_WINDOW_OPEN),
KVM_EXIT_STRING(SHUTDOWN),
KVM_EXIT_STRING(FAIL_ENTRY),
KVM_EXIT_STRING(INTR),
KVM_EXIT_STRING(SET_TPR),
KVM_EXIT_STRING(TPR_ACCESS),
KVM_EXIT_STRING(S390_SIEIC),
KVM_EXIT_STRING(S390_RESET),
KVM_EXIT_STRING(DCR),
KVM_EXIT_STRING(NMI),
KVM_EXIT_STRING(INTERNAL_ERROR),
KVM_EXIT_STRING(OSI),
KVM_EXIT_STRING(PAPR_HCALL),
KVM_EXIT_STRING(S390_UCONTROL),
KVM_EXIT_STRING(WATCHDOG),
KVM_EXIT_STRING(S390_TSCH),
KVM_EXIT_STRING(EPR),
KVM_EXIT_STRING(SYSTEM_EVENT),
KVM_EXIT_STRING(S390_STSI),
KVM_EXIT_STRING(IOAPIC_EOI),
KVM_EXIT_STRING(HYPERV),
KVM_EXIT_STRING(ARM_NISV),
KVM_EXIT_STRING(X86_RDMSR),
KVM_EXIT_STRING(X86_WRMSR),
KVM_EXIT_STRING(DIRTY_RING_FULL),
KVM_EXIT_STRING(AP_RESET_HOLD),
KVM_EXIT_STRING(X86_BUS_LOCK),
KVM_EXIT_STRING(XEN),
KVM_EXIT_STRING(RISCV_SBI),
KVM_EXIT_STRING(RISCV_CSR),
KVM_EXIT_STRING(NOTIFY),
KVM_EXIT_STRING(LOONGARCH_IOCSR),
KVM_EXIT_STRING(MEMORY_FAULT),
};
/*
* Exit Reason String
*
* Input Args :
* exit_reason - Exit reason
*
* Output Args : None
*
* Return :
* Constant string pointer describing the exit reason .
*
* Locates and returns a constant string that describes the KVM exit
* reason given by exit_reason . If no such string is found , a constant
* string of " Unknown " is returned .
*/
const char *exit_reason_str(unsigned int exit_reason)
{
unsigned int n1;
for (n1 = 0 ; n1 < ARRAY_SIZE(exit_reasons_known); n1++) {
if (exit_reason == exit_reasons_known[n1].reason)
return exit_reasons_known[n1].name;
}
return "Unknown" ;
}
/*
* Physical Contiguous Page Allocator
*
* Input Args :
* vm - Virtual Machine
* num - number of pages
* paddr_min - Physical address minimum
* memslot - Memory region to allocate page from
* protected - True if the pages will be used as protected / private memory
*
* Output Args : None
*
* Return :
* Starting physical address
*
* Within the VM specified by vm , locates a range of available physical
* pages at or above paddr_min . If found , the pages are marked as in use
* and their base address is returned . A TEST_ASSERT failure occurs if
* not enough pages are available at or above paddr_min .
*/
vm_paddr_t __vm_phy_pages_alloc(struct kvm_vm *vm, size_t num,
vm_paddr_t paddr_min, uint32_t memslot,
bool protected )
{
struct userspace_mem_region *region;
sparsebit_idx_t pg, base;
TEST_ASSERT(num > 0 , "Must allocate at least one page" );
TEST_ASSERT((paddr_min % vm->page_size) == 0 , "Min physical address "
"not divisible by page size.\n"
" paddr_min: 0x%lx page_size: 0x%x" ,
paddr_min, vm->page_size);
region = memslot2region(vm, memslot);
TEST_ASSERT(!protected || region->protected_phy_pages,
"Region doesn't support protected memory" );
base = pg = paddr_min >> vm->page_shift;
do {
for (; pg < base + num; ++pg) {
if (!sparsebit_is_set(region->unused_phy_pages, pg)) {
base = pg = sparsebit_next_set(region->unused_phy_pages, pg);
break ;
}
}
} while (pg && pg != base + num);
if (pg == 0 ) {
fprintf(stderr, "No guest physical page available, "
"paddr_min: 0x%lx page_size: 0x%x memslot: %u\n" ,
paddr_min, vm->page_size, memslot);
fputs("---- vm dump ----\n" , stderr);
vm_dump(stderr, vm, 2 );
abort();
}
for (pg = base; pg < base + num; ++pg) {
sparsebit_clear(region->unused_phy_pages, pg);
if (protected )
sparsebit_set(region->protected_phy_pages, pg);
}
return base * vm->page_size;
}
vm_paddr_t vm_phy_page_alloc(struct kvm_vm *vm, vm_paddr_t paddr_min,
uint32_t memslot)
{
return vm_phy_pages_alloc(vm, 1 , paddr_min, memslot);
}
vm_paddr_t vm_alloc_page_table(struct kvm_vm *vm)
{
return vm_phy_page_alloc(vm, KVM_GUEST_PAGE_TABLE_MIN_PADDR,
vm->memslots[MEM_REGION_PT]);
}
/*
* Address Guest Virtual to Host Virtual
*
* Input Args :
* vm - Virtual Machine
* gva - VM virtual address
*
* Output Args : None
*
* Return :
* Equivalent host virtual address
*/
void *addr_gva2hva(struct kvm_vm *vm, vm_vaddr_t gva)
{
return addr_gpa2hva(vm, addr_gva2gpa(vm, gva));
}
unsigned long __weak vm_compute_max_gfn(struct kvm_vm *vm)
{
return ((1 ULL << vm->pa_bits) >> vm->page_shift) - 1 ;
}
static unsigned int vm_calc_num_pages(unsigned int num_pages,
unsigned int page_shift,
unsigned int new_page_shift,
bool ceil)
{
unsigned int n = 1 << (new_page_shift - page_shift);
if (page_shift >= new_page_shift)
return num_pages * (1 << (page_shift - new_page_shift));
return num_pages / n + !!(ceil && num_pages % n);
}
static inline int getpageshift(void )
{
return __builtin_ffs(getpagesize()) - 1 ;
}
unsigned int
vm_num_host_pages(enum vm_guest_mode mode, unsigned int num_guest_pages)
{
return vm_calc_num_pages(num_guest_pages,
vm_guest_mode_params[mode].page_shift,
getpageshift(), true );
}
unsigned int
vm_num_guest_pages(enum vm_guest_mode mode, unsigned int num_host_pages)
{
return vm_calc_num_pages(num_host_pages, getpageshift(),
vm_guest_mode_params[mode].page_shift, false );
}
unsigned int vm_calc_num_guest_pages(enum vm_guest_mode mode, size_t size)
{
unsigned int n;
n = DIV_ROUND_UP(size, vm_guest_mode_params[mode].page_size);
return vm_adjust_num_guest_pages(mode, n);
}
/*
* Read binary stats descriptors
*
* Input Args :
* stats_fd - the file descriptor for the binary stats file from which to read
* header - the binary stats metadata header corresponding to the given FD
*
* Output Args : None
*
* Return :
* A pointer to a newly allocated series of stat descriptors .
* Caller is responsible for freeing the returned kvm_stats_desc .
*
* Read the stats descriptors from the binary stats interface .
*/
struct kvm_stats_desc *read_stats_descriptors(int stats_fd,
struct kvm_stats_header *header)
{
struct kvm_stats_desc *stats_desc;
ssize_t desc_size, total_size, ret;
desc_size = get_stats_descriptor_size(header);
total_size = header->num_desc * desc_size;
stats_desc = calloc(header->num_desc, desc_size);
TEST_ASSERT(stats_desc, "Allocate memory for stats descriptors" );
ret = pread(stats_fd, stats_desc, total_size, header->desc_offset);
TEST_ASSERT(ret == total_size, "Read KVM stats descriptors" );
return stats_desc;
}
/*
* Read stat data for a particular stat
*
* Input Args :
* stats_fd - the file descriptor for the binary stats file from which to read
* header - the binary stats metadata header corresponding to the given FD
* desc - the binary stat metadata for the particular stat to be read
* max_elements - the maximum number of 8 - byte values to read into data
*
* Output Args :
* data - the buffer into which stat data should be read
*
* Read the data values of a specified stat from the binary stats interface .
*/
void read_stat_data(int stats_fd, struct kvm_stats_header *header,
struct kvm_stats_desc *desc, uint64_t *data,
size_t max_elements)
{
size_t nr_elements = min_t(ssize_t, desc->size, max_elements);
size_t size = nr_elements * sizeof (*data);
ssize_t ret;
TEST_ASSERT(desc->size, "No elements in stat '%s'" , desc->name);
TEST_ASSERT(max_elements, "Zero elements requested for stat '%s'" , desc->name);
ret = pread(stats_fd, data, size,
header->data_offset + desc->offset);
TEST_ASSERT(ret >= 0 , "pread() failed on stat '%s', errno: %i (%s)" ,
desc->name, errno, strerror(errno));
TEST_ASSERT(ret == size,
"pread() on stat '%s' read %ld bytes, wanted %lu bytes" ,
desc->name, size, ret);
}
void kvm_get_stat(struct kvm_binary_stats *stats, const char *name,
uint64_t *data, size_t max_elements)
{
struct kvm_stats_desc *desc;
size_t size_desc;
int i;
if (!stats->desc) {
read_stats_header(stats->fd, &stats->header);
stats->desc = read_stats_descriptors(stats->fd, &stats->header);
}
size_desc = get_stats_descriptor_size(&stats->header);
for (i = 0 ; i < stats->header.num_desc; ++i) {
desc = (void *)stats->desc + (i * size_desc);
if (strcmp(desc->name, name))
continue ;
read_stat_data(stats->fd, &stats->header, desc, data, max_elements);
return ;
}
TEST_FAIL("Unable to find stat '%s'" , name);
}
__weak void kvm_arch_vm_post_create(struct kvm_vm *vm)
{
}
__weak void kvm_selftest_arch_init(void )
{
}
void __attribute((constructor)) kvm_selftest_init(void )
{
/* Tell stdout not to buffer its content. */
setbuf(stdout, NULL);
guest_random_seed = last_guest_seed = random();
pr_info("Random seed: 0x%x\n" , guest_random_seed);
kvm_selftest_arch_init();
}
bool vm_is_gpa_protected(struct kvm_vm *vm, vm_paddr_t paddr)
{
sparsebit_idx_t pg = 0 ;
struct userspace_mem_region *region;
if (!vm_arch_has_protected_memory(vm))
return false ;
region = userspace_mem_region_find(vm, paddr, paddr);
TEST_ASSERT(region, "No vm physical memory at 0x%lx" , paddr);
pg = paddr >> vm->page_shift;
return sparsebit_is_set(region->protected_phy_pages, pg);
}
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