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 | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
--- .before/arch/x86/kvm/vmx.c 2013-04-17 14:20:51.000000000 +0300
+++ .after/arch/x86/kvm/vmx.c 2013-04-17 14:20:51.000000000 +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;
@@ -5587,6 +5592,10 @@ static inline void nested_release_vmcs12
{
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;
free_vmcs(vmx->nested.current_shadow_vmcs);
}
}
@@ -5716,6 +5725,10 @@ 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 shdowed
+ */
}
/* Emulate the VMCLEAR instruction */
@@ -6127,6 +6140,7 @@ static int handle_vmptrld(struct kvm_vcp
/* init shadow vmcs */
vmcs_clear(shadow_vmcs);
vmx->nested.current_shadow_vmcs = shadow_vmcs;
+ vmx->nested.sync_shadow_vmcs = true;
}
}
@@ -6876,6 +6890,10 @@ static void __noclone vmx_vcpu_run(struc
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
unsigned long debugctlmsr;
+ if (vmx->nested.sync_shadow_vmcs) {
+ copy_vmcs12_to_shadow(vmx);
+ vmx->nested.sync_shadow_vmcs = false;
+ }
/* Record the guest's net vcpu time for enforced NMI injections. */
if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked))
@@ -7496,6 +7514,8 @@ static int nested_vmx_run(struct kvm_vcp
skip_emulated_instruction(vcpu);
vmcs12 = get_vmcs12(vcpu);
+ if (enable_shadow_vmcs)
+ copy_shadow_to_vmcs12(vmx);
/*
* The nested entry process starts with enforcing various prerequisites
* on vmcs12 as required by the Intel SDM, and act appropriately when
@@ -7938,6 +7958,8 @@ static void nested_vmx_vmexit(struct kvm
nested_vmx_failValid(vcpu, vmcs_read32(VM_INSTRUCTION_ERROR));
} else
nested_vmx_succeed(vcpu);
+ if (enable_shadow_vmcs)
+ vmx->nested.sync_shadow_vmcs = true;
}
/*
@@ -7955,6 +7977,8 @@ static void nested_vmx_entry_failure(str
vmcs12->vm_exit_reason = reason | VMX_EXIT_REASONS_FAILED_VMENTRY;
vmcs12->exit_qualification = qualification;
nested_vmx_succeed(vcpu);
+ if (enable_shadow_vmcs)
+ to_vmx(vcpu)->nested.sync_shadow_vmcs = true;
}
static int vmx_check_intercept(struct kvm_vcpu *vcpu,
--
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