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KVM: nVMX: Enable and disable shadow vmcs functionality 

Once L1 loads VMCS12 we enable shadow-vmcs capability and copy all the VMCS12
shadowed fields to the shadow vmcs.  When we release the VMCS12, we also
disable shadow-vmcs capability.

Signed-off-by: Abel Gordon <abelg@il.ibm.com>
Reviewed-by: Orit Wasserman <owasserm@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Abel Gordon 2013-04-18 14:39:55 +03:00 committed by Gleb Natapov
parent 012f83cb2f
commit 8a1b9dd000
1 changed files with 11 additions and 0 deletions
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11
arch/x86/kvm/vmx.c
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@ -5616,12 +5616,17 @@ static int nested_vmx_check_permission(struct kvm_vcpu *vcpu)
static inline void nested_release_vmcs12(struct vcpu_vmx *vmx)
{
u32 exec_control;
if (enable_shadow_vmcs) {
if (vmx->nested.current_vmcs12 != NULL) {
/* copy to memory all shadowed fields in case
they were modified */
copy_shadow_to_vmcs12(vmx);
vmx->nested.sync_shadow_vmcs = false;
exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
exec_control &= ~SECONDARY_EXEC_SHADOW_VMCS;
vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
vmcs_write64(VMCS_LINK_POINTER, -1ull);
}
}
kunmap(vmx->nested.current_vmcs12_page);
@ -6110,6 +6115,7 @@ static int handle_vmptrld(struct kvm_vcpu *vcpu)
gva_t gva;
gpa_t vmptr;
struct x86_exception e;
u32 exec_control;
if (!nested_vmx_check_permission(vcpu))
return 1;
@ -6155,6 +6161,11 @@ static int handle_vmptrld(struct kvm_vcpu *vcpu)
vmx->nested.current_vmcs12 = new_vmcs12;
vmx->nested.current_vmcs12_page = page;
if (enable_shadow_vmcs) {
exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
exec_control |= SECONDARY_EXEC_SHADOW_VMCS;
vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
vmcs_write64(VMCS_LINK_POINTER,
__pa(vmx->nested.current_shadow_vmcs));
vmx->nested.sync_shadow_vmcs = true;
}
}