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kvm: nVMX: Fix nested_vmx_check_msr_bitmap_controls

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Allow the L1 guest to specify the last page of addressable guest
physical memory for an L2 MSR permission bitmap. Also remove the
vmcs12_read_any() check that should never fail.

Fixes: 3af18d9c5f ("KVM: nVMX: Prepare for using hardware MSR bitmap")
Signed-off-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jim Mattson 2017-07-06 16:33:07 -07:00 committed by Radim Krčmář
parent 56a205100d
commit 5fa99cbe7b
1 changed files with 6 additions and 11 deletions
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17
arch/x86/kvm/vmx.c
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@ -4634,6 +4634,11 @@ static bool guest_state_valid(struct kvm_vcpu *vcpu)
return true;
}
static bool page_address_valid(struct kvm_vcpu *vcpu, gpa_t gpa)
{
return PAGE_ALIGNED(gpa) && !(gpa >> cpuid_maxphyaddr(vcpu));
}
static int init_rmode_tss(struct kvm *kvm)
{
gfn_t fn;
@ -9611,20 +9616,10 @@ static int nested_vmx_check_io_bitmap_controls(struct kvm_vcpu *vcpu,
static int nested_vmx_check_msr_bitmap_controls(struct kvm_vcpu *vcpu,
struct vmcs12 *vmcs12)
{
int maxphyaddr;
u64 addr;
if (!nested_cpu_has(vmcs12, CPU_BASED_USE_MSR_BITMAPS))
return 0;
if (vmcs12_read_any(vcpu, MSR_BITMAP, &addr)) {
WARN_ON(1);
return -EINVAL;
}
maxphyaddr = cpuid_maxphyaddr(vcpu);
if (!PAGE_ALIGNED(vmcs12->msr_bitmap) ||
((addr + PAGE_SIZE) >> maxphyaddr))
if (!page_address_valid(vcpu, vmcs12->msr_bitmap))
return -EINVAL;
return 0;