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KVM: nVMX: Allow to disable CR3 access interception

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We already have this control enabled by exposing a broken
MSR_IA32_VMX_PROCBASED_CTLS value. This will properly advertise our
capability once the value is fixed by clearing the right bits in
MSR_IA32_VMX_TRUE_PROCBASED_CTLS. We also have to ensure to test the
right value on L2 entry.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jan Kiszka 2014-06-16 13:59:41 +02:00 committed by Paolo Bonzini
parent 3dbcd8da7b
commit 3dcdf3ec6e
1 changed files with 10 additions and 1 deletions
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11
arch/x86/kvm/vmx.c
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@ -2239,6 +2239,7 @@ static inline bool nested_vmx_allowed(struct kvm_vcpu *vcpu)
* or other means.
*/
static u32 nested_vmx_procbased_ctls_low, nested_vmx_procbased_ctls_high;
static u32 nested_vmx_true_procbased_ctls_low;
static u32 nested_vmx_secondary_ctls_low, nested_vmx_secondary_ctls_high;
static u32 nested_vmx_pinbased_ctls_low, nested_vmx_pinbased_ctls_high;
static u32 nested_vmx_exit_ctls_low, nested_vmx_exit_ctls_high;
@ -2328,6 +2329,10 @@ static __init void nested_vmx_setup_ctls_msrs(void)
*/
nested_vmx_procbased_ctls_high |= CPU_BASED_USE_MSR_BITMAPS;
/* We support free control of CR3 access interception. */
nested_vmx_true_procbased_ctls_low = nested_vmx_procbased_ctls_low &
~(CPU_BASED_CR3_LOAD_EXITING | CPU_BASED_CR3_STORE_EXITING);
/* secondary cpu-based controls */
rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2,
nested_vmx_secondary_ctls_low, nested_vmx_secondary_ctls_high);
@ -2395,6 +2400,9 @@ static int vmx_get_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
nested_vmx_pinbased_ctls_high);
break;
case MSR_IA32_VMX_TRUE_PROCBASED_CTLS:
*pdata = vmx_control_msr(nested_vmx_true_procbased_ctls_low,
nested_vmx_procbased_ctls_high);
break;
case MSR_IA32_VMX_PROCBASED_CTLS:
*pdata = vmx_control_msr(nested_vmx_procbased_ctls_low,
nested_vmx_procbased_ctls_high);
@ -8127,7 +8135,8 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
}
if (!vmx_control_verify(vmcs12->cpu_based_vm_exec_control,
nested_vmx_procbased_ctls_low, nested_vmx_procbased_ctls_high) ||
nested_vmx_true_procbased_ctls_low,
nested_vmx_procbased_ctls_high) ||
!vmx_control_verify(vmcs12->secondary_vm_exec_control,
nested_vmx_secondary_ctls_low, nested_vmx_secondary_ctls_high) ||
!vmx_control_verify(vmcs12->pin_based_vm_exec_control,