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nVMX x86: Check VMX-preemption timer controls on vmentry of L2 guests

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According to section "Checks on VMX Controls" in Intel SDM vol 3C, the
following check needs to be enforced on vmentry of L2 guests:

    If the "activate VMX-preemption timer" VM-execution control is 0, the
    the "save VMX-preemption timer value" VM-exit control must also be 0.

Signed-off-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Reviewed-by: Mihai Carabas <mihai.carabas@oracle.com>
Reviewed-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Krish Sadhukhan 2018-11-01 01:21:58 -04:00 committed by Paolo Bonzini
parent 00df9181de
commit 14aa61d0a9
1 changed files with 10 additions and 0 deletions
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10
arch/x86/kvm/vmx.c
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@ -2084,6 +2084,12 @@ static inline bool nested_cpu_has_shadow_vmcs(struct vmcs12 *vmcs12)
return nested_cpu_has2(vmcs12, SECONDARY_EXEC_SHADOW_VMCS);
}
static inline bool nested_cpu_has_save_preemption_timer(struct vmcs12 *vmcs12)
{
return vmcs12->vm_exit_controls &
VM_EXIT_SAVE_VMX_PREEMPTION_TIMER;
}
static inline bool is_nmi(u32 intr_info)
{
return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
@ -13051,6 +13057,10 @@ static int check_vmentry_prereqs(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
if (nested_vmx_check_msr_switch_controls(vcpu, vmcs12))
return VMXERR_ENTRY_INVALID_CONTROL_FIELD;
if (!nested_cpu_has_preemption_timer(vmcs12) &&
nested_cpu_has_save_preemption_timer(vmcs12))
return VMXERR_ENTRY_INVALID_CONTROL_FIELD;
if (nested_vmx_check_pml_controls(vcpu, vmcs12))
return VMXERR_ENTRY_INVALID_CONTROL_FIELD;