KVM: nVMX: Synchronize VMCS12 content with the shadow vmcs
Synchronize between the VMCS12 software controlled structure and the
processor-specific shadow vmcs
Signed-off-by: Abel Gordon <abelg@il.ibm.com>
Reviewed-by: Orit Wasserman <owasserm@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 8dc59aa..c5baecc 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -356,6 +356,11 @@
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;
@@ -5611,6 +5616,14 @@
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);
}
@@ -5739,6 +5752,10 @@
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 */
@@ -6137,6 +6154,9 @@
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;
+ }
}
nested_vmx_succeed(vcpu);
@@ -6895,6 +6915,11 @@
if (vmx->emulation_required)
return;
+ if (vmx->nested.sync_shadow_vmcs) {
+ copy_vmcs12_to_shadow(vmx);
+ vmx->nested.sync_shadow_vmcs = false;
+ }
+
if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty))
vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);
if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty))
@@ -7504,6 +7529,9 @@
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
@@ -7950,6 +7978,8 @@
nested_vmx_failValid(vcpu, vmcs_read32(VM_INSTRUCTION_ERROR));
} else
nested_vmx_succeed(vcpu);
+ if (enable_shadow_vmcs)
+ vmx->nested.sync_shadow_vmcs = true;
}
/*
@@ -7967,6 +7997,8 @@
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,