Synchronize between the VMCS12 software controlled structure and the processor-specific shadow vmcs
Signed-off-by: Abel Gordon <[email protected]> --- arch/x86/kvm/vmx.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) --- .before/arch/x86/kvm/vmx.c 2013-04-18 13:31:35.000000000 +0300 +++ .after/arch/x86/kvm/vmx.c 2013-04-18 13:31:35.000000000 +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; @@ -5611,6 +5616,14 @@ 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); } @@ -5739,6 +5752,10 @@ 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 */ @@ -6137,6 +6154,9 @@ 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; + } } nested_vmx_succeed(vcpu); @@ -6895,6 +6915,11 @@ static void __noclone vmx_vcpu_run(struc 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 @@ 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 @@ -7950,6 +7978,8 @@ 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; } /* @@ -7967,6 +7997,8 @@ 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, -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
