xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

KVM: x86: reserve bit 8 of non-leaf PDPEs and PML4Es in 64-bit mode on AMD

Browse Source 
Bit 8 would be the "global" bit, which does not quite make sense for non-leaf
page table entries.  Intel ignores it; AMD ignores it in PDEs, but reserves it
in PDPEs and PML4Es.  The SVM test is relying on this behavior, so enforce it.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini
2014-09-02 13:24:12 +02:00
parent d143148383
commit a0c0feb579
2 changed files with 19 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
arch/x86/kvm/cpuid.h
View File

@@ -88,6 +88,14 @@ static inline bool guest_cpuid_has_x2apic(struct kvm_vcpu *vcpu)
return best && (best->ecx & bit(X86_FEATURE_X2APIC));
}
static inline bool guest_cpuid_is_amd(struct kvm_vcpu *vcpu)
{
struct kvm_cpuid_entry2 *best;
best = kvm_find_cpuid_entry(vcpu, 0, 0);
return best && best->ebx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx;
}
static inline bool guest_cpuid_has_gbpages(struct kvm_vcpu *vcpu)
{
struct kvm_cpuid_entry2 *best;