Quelle  vmx_onhyperv.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only

#include "capabilities.h"
#include "vmx_onhyperv.h"

DEFINE_STATIC_KEY_FALSE(__kvm_is_using_evmcs);

/*
 * KVM on Hyper-V always uses the latest known eVMCSv1 revision, the assumption
 * is: in case a feature has corresponding fields in eVMCS described and it was
 * exposed in VMX feature MSRs, KVM is free to use it. Warn if KVM meets a
 * feature which has no corresponding eVMCS field, this likely means that KVM
 * needs to be updated.
 */
#define evmcs_check_vmcs_conf(field, ctrl)     \
 do {         \
  typeof(vmcs_conf->field) unsupported;    \
          \
  unsupported = vmcs_conf->field & ~EVMCS1_SUPPORTED_ ## ctrl; \
  if (unsupported) {      \
   pr_warn_once(#field " unsupported with eVMCS: 0x%llx\n",\
         (u64)unsupported);    \
   vmcs_conf->field &= EVMCS1_SUPPORTED_ ## ctrl;  \
  }        \
 }         \
 while (0)

void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf)
{
 evmcs_check_vmcs_conf(cpu_based_exec_ctrl, EXEC_CTRL);
 evmcs_check_vmcs_conf(pin_based_exec_ctrl, PINCTRL);
 evmcs_check_vmcs_conf(cpu_based_2nd_exec_ctrl, 2NDEXEC);
 evmcs_check_vmcs_conf(cpu_based_3rd_exec_ctrl, 3RDEXEC);
 evmcs_check_vmcs_conf(vmentry_ctrl, VMENTRY_CTRL);
 evmcs_check_vmcs_conf(vmexit_ctrl, VMEXIT_CTRL);
}