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KVM: SVM: fix guest global tlb flushes with NPT 

Accesses to CR4 are intercepted even with Nested Paging enabled. But the code
does not check if the guest wants to do a global TLB flush. So this flush gets
lost. This patch adds the check and the flush to svm_set_cr4.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
hifive-unleashed-5.1
Joerg Roedel 2008-09-09 19:11:51 +02:00 committed by Avi Kivity
parent 44874f8491
commit e5eab0cede
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kvm/svm.c
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@ -879,6 +879,10 @@ set:
static void svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
{
unsigned long host_cr4_mce = read_cr4() & X86_CR4_MCE;
unsigned long old_cr4 = to_svm(vcpu)->vmcb->save.cr4;
if (npt_enabled && ((old_cr4 ^ cr4) & X86_CR4_PGE))
force_new_asid(vcpu);
vcpu->arch.cr4 = cr4;
if (!npt_enabled)