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KVM: nVMX: initialize PML fields in vmcs02 

L2 was running with uninitialized PML fields which led to incomplete
dirty bitmap logging. This manifested as all kinds of subtle erratic
behavior of the nested guest.

Fixes: 843e433057 ("KVM: VMX: Add PML support in VMX")
Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Ladi Prosek 2017-04-04 14:18:53 +02:00 committed by Radim Krčmář
parent ab007cc94f
commit 1fb883bb82
1 changed files with 12 additions and 0 deletions
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12
arch/x86/kvm/vmx.c
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@ -10270,6 +10270,18 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
}
if (enable_pml) {
/*
* Conceptually we want to copy the PML address and index from
* vmcs01 here, and then back to vmcs01 on nested vmexit. But,
* since we always flush the log on each vmexit, this happens
* to be equivalent to simply resetting the fields in vmcs02.
*/
ASSERT(vmx->pml_pg);
vmcs_write64(PML_ADDRESS, page_to_phys(vmx->pml_pg));
vmcs_write16(GUEST_PML_INDEX, PML_ENTITY_NUM - 1);
}
if (nested_cpu_has_ept(vmcs12)) {
kvm_mmu_unload(vcpu);
nested_ept_init_mmu_context(vcpu);