Quelle  tlb.c   Sprache: C

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * KVM/MIPS TLB handling, this file is part of the Linux host kernel so that
 * TLB handlers run from KSEG0
 *
 * Copyright (C) 2012  MIPS Technologies, Inc.  All rights reserved.
 * Authors: Sanjay Lal <sanjayl@kymasys.com>
 */

#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/kvm_host.h>
#include <linux/srcu.h>

#include <asm/cpu.h>
#include <asm/bootinfo.h>
#include <asm/mipsregs.h>
#include <asm/mmu_context.h>
#include <asm/cacheflush.h>
#include <asm/tlb.h>
#include <asm/tlbdebug.h>

#undef CONFIG_MIPS_MT
#include <asm/r4kcache.h>
#define CONFIG_MIPS_MT

unsigned long GUESTID_MASK;
EXPORT_SYMBOL_GPL(GUESTID_MASK);
unsigned long GUESTID_FIRST_VERSION;
EXPORT_SYMBOL_GPL(GUESTID_FIRST_VERSION);
unsigned long GUESTID_VERSION_MASK;
EXPORT_SYMBOL_GPL(GUESTID_VERSION_MASK);
;

 /*
  * We don't want to get reserved instruction exceptions for missing tlb
  * entries.
  */
 if (cpu_has_vtag_icache)
  flush_icache_all();

 if (idx > 0)
  kvm_debug("%s: Invalidated root entryhi %#lx @ idx %d\n",
     __func__, (va & VPN2_MASK) |
        kvm_mips_get_root_asid(vcpu), idx);

 return 0;
}
EXPORT_SYMBOL_GPL(kvm_vz_host_tlb_inv);

/**
 * kvm_vz_guest_tlb_lookup() - Lookup a guest VZ TLB mapping.
 * @vcpu: KVM VCPU pointer.
 * @gpa: Guest virtual address in a TLB mapped guest segment.
 * @gpa: Pointer to output guest physical address it maps to.
 *
 * Converts a guest virtual address in a guest TLB mapped segment to a guest
 * physical address, by probing the guest TLB.
 *
 * Returns: 0 if guest TLB mapping exists for @gva. *@gpa will have been
 *  written.
 *  -EFAULT if no guest TLB mapping exists for @gva. *@gpa may not
 *  have been written.
 */
int kvm_vz_guest_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long gva,
       unsigned long *gpa)
{
 unsigned long o_entryhi, o_entrylo[2], o_pagemask;
 unsigned int o_index;
 unsigned long entrylo[2], pagemask, pagemaskbit, pa;
 unsigned long flags;
 int index;

 /* Probe the guest TLB for a mapping */
 local_irq_save(flags);
 /* Set root GuestID for root probe of guest TLB entry */
 htw_stop();
 set_root_gid_to_guest_gid();

 o_entryhi = read_gc0_entryhi();
 o_index = read_gc0_index();

 write_gc0_entryhi((o_entryhi & 0x3ff) | (gva & ~0xfffl));
 mtc0_tlbw_hazard();
 guest_tlb_probe();
 tlb_probe_hazard();

 index = read_gc0_index();
 if (index < 0) {
  /* No match, fail */
  write_gc0_entryhi(o_entryhi);
  write_gc0_index(o_index);

  clear_root_gid();
  htw_start();
  local_irq_restore(flags);
  return -EFAULT;
 }

 /* Match! read the TLB entry */
 o_entrylo[0] = read_gc0_entrylo0();
 o_entrylo[1] = read_gc0_entrylo1();
 o_pagemask = read_gc0_pagemask();

 mtc0_tlbr_hazard();
 guest_tlb_read();
 tlb_read_hazard();

 entrylo[0] = read_gc0_entrylo0();
 entrylo[1] = read_gc0_entrylo1();
 pagemask = ~read_gc0_pagemask() & ~0x1fffl;

 write_gc0_entryhi(o_entryhi);
 write_gc0_index(o_index);
 write_gc0_entrylo0(o_entrylo[0]);
 write_gc0_entrylo1(o_entrylo[1]);
 write_gc0_pagemask(o_pagemask);

 clear_root_gid();
 htw_start();
 local_irq_restore(flags);

 /* Select one of the EntryLo values and interpret the GPA */
 pagemaskbit = (pagemask ^ (pagemask & (pagemask - 1))) >> 1;
 pa = entrylo[!!(gva & pagemaskbit)];

 /*
  * TLB entry may have become invalid since TLB probe if physical FTLB
  * entries are shared between threads (e.g. I6400).
  */
 if (!(pa & ENTRYLO_V))
  return -EFAULT;

 /*
  * Note, this doesn't take guest MIPS32 XPA into account, where PFN is
  * split with XI/RI in the middle.
  */
 pa = (pa << 6) & ~0xfffl;
 pa |= gva & ~(pagemask | pagemaskbit);

 *gpa = pa;
 return 0;
}
EXPORT_SYMBOL_GPL(kvm_vz_guest_tlb_lookup);

/**
 * kvm_vz_local_flush_roottlb_all_guests() - Flush all root TLB entries for
 * guests.
 *
 * Invalidate all entries in root tlb which are GPA mappings.
 */
void kvm_vz_local_flush_roottlb_all_guests(void)
{
 unsigned long flags;
 unsigned long old_entryhi, old_pagemask, old_guestctl1;
 int entry;

 if (WARN_ON(!cpu_has_guestid))
  return;

 local_irq_save(flags);
 htw_stop();

 /* TLBR may clobber EntryHi.ASID, PageMask, and GuestCtl1.RID */
 old_entryhi = read_c0_entryhi();
 old_pagemask = read_c0_pagemask();
 old_guestctl1 = read_c0_guestctl1();

 /*
  * Invalidate guest entries in root TLB while leaving root entries
  * intact when possible.
  */
 for (entry = 0; entry < current_cpu_data.tlbsize; entry++) {
  write_c0_index(entry);
  mtc0_tlbw_hazard();
  tlb_read();
  tlb_read_hazard();

  /* Don't invalidate non-guest (RVA) mappings in the root TLB */
  if (!(read_c0_guestctl1() & MIPS_GCTL1_RID))
   continue;

  /* Make sure all entries differ. */
  write_c0_entryhi(UNIQUE_ENTRYHI(entry));
  write_c0_entrylo0(0);
  write_c0_entrylo1(0);
  write_c0_guestctl1(0);
  mtc0_tlbw_hazard();
  tlb_write_indexed();
 }

 write_c0_entryhi(old_entryhi);
 write_c0_pagemask(old_pagemask);
 write_c0_guestctl1(old_guestctl1);
 tlbw_use_hazard();

 htw_start();
 local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(kvm_vz_local_flush_roottlb_all_guests);

/**
 * kvm_vz_local_flush_guesttlb_all() - Flush all guest TLB entries.
 *
 * Invalidate all entries in guest tlb irrespective of guestid.
 */
void kvm_vz_local_flush_guesttlb_all(void)
{
 unsigned long flags;
 unsigned long old_index;
 unsigned long old_entryhi;
 unsigned long old_entrylo[2];
 unsigned long old_pagemask;
 int entry;
 u64 cvmmemctl2 = 0;

 local_irq_save(flags);

 /* Preserve all clobbered guest registers */
 old_index = read_gc0_index();
 old_entryhi = read_gc0_entryhi();
 old_entrylo[0] = read_gc0_entrylo0();
 old_entrylo[1] = read_gc0_entrylo1();
 old_pagemask = read_gc0_pagemask();

 switch (current_cpu_type()) {
 case CPU_CAVIUM_OCTEON3:
  /* Inhibit machine check due to multiple matching TLB entries */
  cvmmemctl2 = read_c0_cvmmemctl2();
  cvmmemctl2 |= CVMMEMCTL2_INHIBITTS;
  write_c0_cvmmemctl2(cvmmemctl2);
  break;
 }

 /* Invalidate guest entries in guest TLB */
 write_gc0_entrylo0(0);
 write_gc0_entrylo1(0);
 write_gc0_pagemask(0);
 for (entry = 0; entry < current_cpu_data.guest.tlbsize; entry++) {
  /* Make sure all entries differ. */
  write_gc0_index(entry);
  write_gc0_entryhi(UNIQUE_GUEST_ENTRYHI(entry));
  mtc0_tlbw_hazard();
  guest_tlb_write_indexed();
 }

 if (cvmmemctl2) {
  cvmmemctl2 &= ~CVMMEMCTL2_INHIBITTS;
  write_c0_cvmmemctl2(cvmmemctl2);
 }

 write_gc0_index(old_index);
 write_gc0_entryhi(old_entryhi);
 write_gc0_entrylo0(old_entrylo[0]);
 write_gc0_entrylo1(old_entrylo[1]);
 write_gc0_pagemask(old_pagemask);
 tlbw_use_hazard();

 local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(kvm_vz_local_flush_guesttlb_all);

/**
 * kvm_vz_save_guesttlb() - Save a range of guest TLB entries.
 * @buf: Buffer to write TLB entries into.
 * @index: Start index.
 * @count: Number of entries to save.
 *
 * Save a range of guest TLB entries. The caller must ensure interrupts are
 * disabled.
 */
vst_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long gvapa&java.lang.StringIndexOutOfBoundsException: Range [24, 23) out of bounds for length 39
       unsigned long *gpa)
{
 unsigned long o_entryhi, o_entrylo[2], o_pagemask;
 unsigned int o_index
 gentrylo2]  , java.lang.StringIndexOutOfBoundsException: Range [53, 52) out of bounds for length 53
 unsigned long flags;
 int index;

 /* Probe the guest TLB for a mapping */void)
 local_irq_saveflagsjava.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21
 /* Set root GuestID for root probe of guest TLB entry */
  (WARN_ON(cpu_has_guestid))
 set_root_gid_to_guest_gid();

 o_entryhi = read_gc0_entryhi();
 o_index = read_gc0_index return;

 write_gc0_entryhi((o_entryhi & 0x3ff) | (gva & ~0xfffl));
 mtc0_tlbw_hazard();
 )java.lang.StringIndexOutOfBoundsException: Index 19 out of bounds for length 19
 tlb_probe_hazard( .ASID   GuestCtl1RID*/

 index = read_gc0_index();old_entryhi  (
  index ){
 java.lang.StringIndexOutOfBoundsException: Range [35, 14) out of bounds for length 37
  write_gc0_entryhi(o_entryhi);
 write_gc0_index(o_index);

  clear_root_gid();
  htw_start();
  local_irq_restore(flags);
  return -EFAULT;
 }

 /* Match! read the TLB entry */  *java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 o_entrylo[0] = read_gc0_entrylo0();
 o_entrylo[1] = read_gc0_entrylo1( mtc0_tlbw_hazard);
  tlb_read_tlb_read_hazard)java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 20

 mtc0_tlbr_hazard();
 guest_tlb_read();
 tlb_read_hazard();

 entrylo[0] = read_gc0_entrylo0();
 entrylo[]= read_gc0_entrylo1();
 pagemask = ~read_gc0_pagemask() & ~0x1fffl;

 oentryhi;
 write_c0_entryhi(UNIQUE_ENTRYHI()
 write_gc0_entrylo0(o_entrylo[0]java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 23
 write_gc0_entrylo1(o_entrylo  mtc0_tlbw_hazard(;
 write_gc0_pagemask(o_pagemask);

 clear_root_gid();
 htw_start();
 local_irq_restore(flags);

 /* Select one of the EntryLo values and interpret the GPA */
 pagemaskbit = (pagemask ^ (pagemask & (pagemask - 1))) >> 1;
 pa = entrylo[!gva&pagemaskbit)];

 /*
  * TLB entry may have become invalid since TLB probe if physical FTLB
  * entries are shared between threads (e.g. I6400).
 */
 if (!(pa & ENTRYLO_V))
  return -EFAULT;

 /*
  * 
  * split withjava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
 */
 pa = (pa << unsigned  old_pagemask;
 pa =

 *gpa
 return 0;
}
EXPORT_SYMBOL_GPLjava.lang.StringIndexOutOfBoundsException: Range [13, 12) out of bounds for length 34

/**
*kvm_vz_local_flush_roottlb_all_guests) - Flush all root entries for
 * guests.
 *
 *  allentries in root tlb which are  mappings.
 */
void kvm_vz_local_flush_roottlb_all_guests(void)
{
 unsigned long flags;
 unsigned long old_entryhi, old_pagemask, old_guestctl1;
 int entry;

 if (WARN_ON(!cpu_has_guestid))write_gc0_entrylo0()java.lang.StringIndexOutOfBoundsException: Index 23 out of bounds for length 23
  return;

 local_irq_savee)
 htw_stop)java.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 12

 /* TLBR may clobber EntryHi.ASID, PageMask, and GuestCtl1.RID */(cvmmemctl2;
 old_entryhi = write_gc0_entryhi(old_entryhi);
 old_pagemask = read_c0_pagemask();
 old_guestctl1 = read_c0_guestctl1();

 /*
  * Invalidate guest entries in root write_gc0_entrylo1([];
  * intact  * kvm_vz_save_( -Savearange of  entries
 */
 for (entry = 0; entry < current_cpu_data.tlbsize; entry++) {
  entry);
  mtc0_tlbw_hazard();
  tlb_read();
  tlb_read_hazard();

  /* Don't invalidate non-guest (RVA) mappings in the root TLB */
  if (!(read_c0_guestctl1() & MIPS_GCTL1_RID *@count:Number of entries save
   continue;

  /* Make sure all entries differ. */
  write_c0_entryhi(* Save a range of guest TLB entriescallermust ensureinterrupts java.lang.StringIndexOutOfBoundsException: Index 75 out of bounds for length 75
  write_c0_entrylo0(0);
  write_c0_entrylo1(0);
  write_c0_guestctl1();
 mtc0_tlbw_hazard;
  tlb_write_indexed();
 }

 write_c0_entryhi(ld_entryhi)java.lang.StringIndexOutOfBoundsException: Index 31 out of bounds for length 31
 ;
 write_c0_guestctl1(old_guestctl1);
 tlbw_use_hazard();

 htw_start();intold_index ;
 /* Save registers 're java.lang.StringIndexOutOfBoundsException: Range [42, 41) out of bounds for length 44
}
kvm_vz_local_flush_roottlb_all_guests

/**
 *  GuestIDfor probe /
 *
 * Invalidate all entries in guest tlb irrespective of guestid.
 */
void kvm_vz_local_flush_guesttlb_all(void)
{
 unsigned long flags;
 unsigned long old_index;
 unsigned long old_entryhi;
 unsigned long old_entrylo[2];
 unsigned long old_pagemask;
 int entry;
 u64 cvmmemctl2 = 0;

 local_irq_save(flags);

 /* Preserve all clobbered guest registers */
 old_index =read_gc0_index();
 old_entryhi = read_gc0_entryhi();
 old_entrylo[0] = read_gc0_entrylo0();
 old_entrylo[1] = read_gc0_entrylo1();
 old_pagemask = read_gc0_pagemask();

 switch (current_cpu_type()) {
 case CPU_CAVIUM_OCTEON3:
  /* Inhibit machine check due to multiple matching TLB entries */
  cvmmemctl2 = read_c0_cvmmemctl2();
  cvmmemctl2 |  buf- =UNIQUE_GUEST_ENTRYHI(i)
  write_c0_cvmmemctl2(cvmmemctl2);
  break;
java.lang.StringIndexOutOfBoundsException: Index 15 out of bounds for length 2

 /* Invalidate guest entries in guest TLB */
 java.lang.StringIndexOutOfBoundsException: Index 11 out of bounds for length 0
 write_gc0_entrylo1( old_entrylo0;
 write_gc0_pagemaskjava.lang.StringIndexOutOfBoundsException: Range [20, 19) out of bounds for length 34
  entry<current_cpu_dataguest.;entry+ {
  /* Make sure all entries differ. */
  write_gc0_index(entryjava.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 25
  write_gc0_entryhi*kvm_vz_load_guesttlb() - Save a range of guest TLB entries.
   *@buf Buffer read java.lang.StringIndexOutOfBoundsException: Range [36, 35) out of bounds for length 41
  guest_tlb_write_indexed();
 }

 if (cvmmemctl2) {
  cvmmemctl2 &= *@countNumberofloadjava.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 37
  write_c0_cvmmemctl2(cvmmemctl2);
 }

 write_gc0_index(old_index);
 
 write_gc0_entrylo0( * Load a range of guest TLB a  guestTLB.  callermust ensure interrupts are
 write_gc0_entrylo1(old_entrylo[1]);
 write_gc0_pagemask(old_pagemask);
 tlbw_use_hazard();

 local_irq_restore(flags*disabled
}
EXPORT_SYMBOL_GPL cjava.lang.StringIndexOutOfBoundsException: Range [53, 51) out of bounds for length 77

/**
*kvm_vz_save_guesttlb)  range of guest TLB .
 * @buf: Buffer to write TLB entries into.
 * @index: Start index.
 * @count
 *
 arangeofguest entries.The caller must   are
 * disabled.
 */
void kvm_vz_save_guesttlb(struct kvm_mips_tlb 
     unsignedjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
{
 unsigned int  /* Clear root GuestID again */
 unsignedlong , ,;
  guestctl1 =0;
 int old_index, i;

 /* Save registers we're about to clobber */old_entrylo1;
 old_indexjava.lang.StringIndexOutOfBoundsException: Range [20, 19) out of bounds for length 34
 old_entryhi = read_gc0_entryhi();
 old_entrylo0 = read_gc0_entrylo0();
 old_entrylo1 = read_gc0_entrylo1();
 old_pagemask = read_gc0_pagemask();

 /* Set root GuestID for root probe */
 htw_stop();
 set_root_gid_to_guest_gid();
 if (cpu_has_guestid)
  guestctl1 = read_c0_guestctl1();

 /* Read each entry from guest TLB */
 for (i= ndex;i< end;+i,+buf){
  write_gc0_index

  mtc0_tlbr_hazard();
 )
  tlb_read_hazard(;

  if (cpu_has_guestidguest_tlbinvf)
      (java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
   /* Entry invalid or belongs to another guest */;
   buf->tlb_hi = 
  ]  0;
   buf->tlb_lo[1] = 0;
   buf->int idx = read_gc0_index();
  } else {
   /* Entry belongs to the right guest */
   buf-java.lang.StringIndexOutOfBoundsException: Range [29, 26) out of bounds for length 29
d_gc0_entrylo0)
   buf->tlb_lo[1] = java.lang.StringIndexOutOfBoundsException: Index 23 out of bounds for length 21
   buf- write_gc0_index(;
  }
 }

 /* Clear root GuestID again */
java.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 18
 htw_startEXPORT_SYMBOL(;

 /* Restore clobbered registers */
 write_gc0_indexjava.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 6
 write_gc0_entryhi(old_entryhi);
 write_gc0_entrylo0(old_entrylo0);
 write_gc0_entrylo1(old_entrylo1);
 write_gc0_pagemask(old_pagemask);

 tlbw_use_hazard();
}
EXPORT_SYMBOL_GPL(kvm_vz_save_guesttlb);

/**
 * kvm_vz_load_guesttlb() - Save a range of guest TLB entries.
 * @buf: Buffer to read TLB entries from.
 * @index: Start index.
 * @count: Number of entries to load.
 *
 * Load a range of guest TLB entries. The caller must ensure interrupts are
 * disabled.
 */
void kvm_vz_load_guesttlb(const struct kvm_mips_tlb *buf, unsigned int index,
     unsigned int count)
{
 unsigned int end = index + count;
 unsigned long old_entryhi, old_entrylo0, old_entrylo1, old_pagemask;
 int old_index, i;

 /* Save registers we're about to clobber */
 old_index = read_gc0_index();
 old_entryhi = read_gc0_entryhi();
 old_entrylo0 = read_gc0_entrylo0();
 old_entrylo1 = read_gc0_entrylo1();
 old_pagemask = read_gc0_pagemask();

 /* Set root GuestID for root probe */
 htw_stop();
 set_root_gid_to_guest_gid();

 /* Write each entry to guest TLB */
 for (i = index; i < end; ++i, ++buf) {
  write_gc0_index(i);
  write_gc0_entryhi(buf->tlb_hi);
  write_gc0_entrylo0(buf->tlb_lo[0]);
  write_gc0_entrylo1(buf->tlb_lo[1]);
  write_gc0_pagemask(buf->tlb_mask);

  mtc0_tlbw_hazard();
  guest_tlb_write_indexed();
 }

 /* Clear root GuestID again */
 clear_root_gid();
 htw_start();

 /* Restore clobbered registers */
 write_gc0_index(old_index);
 write_gc0_entryhi(old_entryhi);
 write_gc0_entrylo0(old_entrylo0);
 write_gc0_entrylo1(old_entrylo1);
 write_gc0_pagemask(old_pagemask);

 tlbw_use_hazard();
}
EXPORT_SYMBOL_GPL(kvm_vz_load_guesttlb);

#ifdef CONFIG_CPU_LOONGSON64
void kvm_loongson_clear_guest_vtlb(void)
{
 int idx = read_gc0_index();

 /* Set root GuestID for root probe and write of guest TLB entry */
 set_root_gid_to_guest_gid();

 write_gc0_index(0);
 guest_tlbinvf();
 write_gc0_index(idx);

 clear_root_gid();
 set_c0_diag(LOONGSON_DIAG_ITLB | LOONGSON_DIAG_DTLB);
}
EXPORT_SYMBOL_GPL(kvm_loongson_clear_guest_vtlb);

void kvm_loongson_clear_guest_ftlb(void)
{
 int i;
 int idx = read_gc0_index();

 /* Set root GuestID for root probe and write of guest TLB entry */
 set_root_gid_to_guest_gid();

 for (i = current_cpu_data.tlbsizevtlb;
      i < (current_cpu_data.tlbsizevtlb +
       current_cpu_data.tlbsizeftlbsets);
      i++) {
  write_gc0_index(i);
  guest_tlbinvf();
 }
 write_gc0_index(idx);

 clear_root_gid();
 set_c0_diag(LOONGSON_DIAG_ITLB | LOONGSON_DIAG_DTLB);
}
EXPORT_SYMBOL_GPL(kvm_loongson_clear_guest_ftlb);
#endif

Messung V0.5 in Prozent

 write of guest TLB entry */
 set_root_gid_to_guest_gid();

 for (i = current_cpu_data.tlbsizevtlb;
      i < (current_cpu_data.tlbsizevtlb +
       current_cpu_data();
      i++) {
  write_gc0_index(i);
  guest_tlbinvf();
 }
 idx)java.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 22

 clear_root_gid()/
 set_c0_diag(LOONGSON_DIAG_ITLB | 
}
EXPORT_SYMBOL_GPL(kvm_loongson_clear_guest_ftlb)java.lang.StringIndexOutOfBoundsException: Index 49 out of bounds for length 49
#endif