Gleb Natapov <gleb@xxxxxxxxxx> wrote on 18/04/2013 09:41:16 AM:
> On Wed, Apr 17, 2013 at 08:09:40PM +0300, Abel Gordon wrote:
> > Synchronize between the VMCS12 software controlled structure and the
> > processor-specific shadow vmcs
> >
> > Signed-off-by: Abel Gordon <abelg@xxxxxxxxxx>
> > ---
> > arch/x86/kvm/vmx.c | 32 ++++++++++++++++++++++++++++++++
> > 1 file changed, 32 insertions(+)
> >
> > --- .before/arch/x86/kvm/vmx.c 2013-04-17 19:58:33.000000000 +0300
> > +++ .after/arch/x86/kvm/vmx.c 2013-04-17 19:58:33.000000000 +0300
> > @@ -356,6 +356,11 @@ struct nested_vmx {
> > struct page *current_vmcs12_page;
> > struct vmcs12 *current_vmcs12;
> > struct vmcs *current_shadow_vmcs;
> > + /*
> > + * Indicates if the shadow vmcs must be updated with the
> > + * data hold by vmcs12
> > + */
> > + bool sync_shadow_vmcs;
> >
> > /* vmcs02_list cache of VMCSs recently used to run L2 guests */
> > struct list_head vmcs02_pool;
> > @@ -5596,6 +5601,14 @@ static int nested_vmx_check_permission(s
> >
> > static inline void nested_release_vmcs12(struct vcpu_vmx *vmx)
> > {
> > + 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;
> > + }
> > + }
> > kunmap(vmx->nested.current_vmcs12_page);
> > nested_release_page(vmx->nested.current_vmcs12_page);
> > }
> > @@ -5724,6 +5737,10 @@ static void nested_vmx_failValid(struct
> > X86_EFLAGS_SF | X86_EFLAGS_OF))
> > | X86_EFLAGS_ZF);
> > get_vmcs12(vcpu)->vm_instruction_error = vm_instruction_error;
> > + /*
> > + * We don't need to force a shadow sync because
> > + * VM_INSTRUCTION_ERROR is not shadowed
> > + */
> > }
> >
> > /* Emulate the VMCLEAR instruction */
> > @@ -6122,6 +6139,9 @@ static int handle_vmptrld(struct kvm_vcp
> > vmx->nested.current_vmptr = vmptr;
> > vmx->nested.current_vmcs12 = new_vmcs12;
> > vmx->nested.current_vmcs12_page = page;
> > + if (enable_shadow_vmcs) {
> > + vmx->nested.sync_shadow_vmcs = true;
> > + }
> No need braces around one statement according to kernel coding style.
The last patch introduces code within the braces... I usually prefer
to add them in advance so you don't see the "if" statement as modified
in future patches. If this is not a common practice, I'll remove the
braces here and add them again later. Please confirm.
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