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KVM: nVMX: introduce nested_vmx_load_cr3 and call it on vmentry

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Loading CR3 as part of emulating vmentry is different from regular CR3 loads,
as implemented in kvm_set_cr3, in several ways.

* different rules are followed to check CR3 and it is desirable for the caller
to distinguish between the possible failures
* PDPTRs are not loaded if PAE paging and nested EPT are both enabled
* many MMU operations are not necessary

This patch introduces nested_vmx_load_cr3 suitable for CR3 loads as part of
nested vmentry and vmexit, and makes use of it on the nested vmentry path.

Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Ladi Prosek
2016-11-30 16:03:10 +01:00
committed by Paolo Bonzini
parent ee146c1c10
commit 9ed38ffad4
3 changed files with 45 additions and 16 deletions
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3
arch/x86/kvm/x86.c
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@@ -566,7 +566,7 @@ out:
}
EXPORT_SYMBOL_GPL(load_pdptrs);
static bool pdptrs_changed(struct kvm_vcpu *vcpu)
bool pdptrs_changed(struct kvm_vcpu *vcpu)
{
u64 pdpte[ARRAY_SIZE(vcpu->arch.walk_mmu->pdptrs)];
bool changed = true;
@@ -592,6 +592,7 @@ out:
return changed;
}
EXPORT_SYMBOL_GPL(pdptrs_changed);
int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
{