On 2013-07-03 18:05, Arthur Chunqi Li wrote:
> Set success rflags after emulating VMXON/VMXOFF in nested environment.
>
> Re-arrange the code sequence of 3 functions,
> nested_vmx_succeed()/failValid()/failInvalid(), to avoid double
> declaration in the same file.
Just don't forget to provide corresponding test cases. But you can
collect trivial checks like these and do a single VMX startup/shutdown
test case that consists of several smaller test steps.
Jan
>
> Signed-off-by: Arthur Chunqi Li <yzt356@xxxxxxxxx>
> ---
> arch/x86/kvm/vmx.c | 85 ++++++++++++++++++++++++++--------------------------
> 1 file changed, 42 insertions(+), 43 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index 260a919..423bc411 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -5551,8 +5551,47 @@ static void nested_free_all_saved_vmcss(struct vcpu_vmx *vmx)
> free_loaded_vmcs(&vmx->vmcs01);
> }
>
> +/*
> + * The following 3 functions, nested_vmx_succeed()/failValid()/failInvalid(),
> + * set the success or error code of an emulated VMX instruction, as specified
> + * by Vol 2B, VMX Instruction Reference, "Conventions".
> + */
> +static void nested_vmx_succeed(struct kvm_vcpu *vcpu)
> +{
> + vmx_set_rflags(vcpu, vmx_get_rflags(vcpu)
> + & ~(X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF |
> + X86_EFLAGS_ZF | X86_EFLAGS_SF | X86_EFLAGS_OF));
> +}
> +
> +static void nested_vmx_failInvalid(struct kvm_vcpu *vcpu)
> +{
> + vmx_set_rflags(vcpu, (vmx_get_rflags(vcpu)
> + & ~(X86_EFLAGS_PF | X86_EFLAGS_AF | X86_EFLAGS_ZF |
> + X86_EFLAGS_SF | X86_EFLAGS_OF))
> + | X86_EFLAGS_CF);
> +}
> +
> static void nested_vmx_failValid(struct kvm_vcpu *vcpu,
> - u32 vm_instruction_error);
> + u32 vm_instruction_error)
> +{
> + if (to_vmx(vcpu)->nested.current_vmptr == -1ull) {
> + /*
> + * failValid writes the error number to the current VMCS, which
> + * can't be done there isn't a current VMCS.
> + */
> + nested_vmx_failInvalid(vcpu);
> + return;
> + }
> + vmx_set_rflags(vcpu, (vmx_get_rflags(vcpu)
> + & ~(X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF |
> + 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 VMXON instruction.
> @@ -5612,6 +5651,7 @@ static int handle_vmon(struct kvm_vcpu *vcpu)
> vmx->nested.vmxon = true;
>
> skip_emulated_instruction(vcpu);
> + nested_vmx_succeed(vcpu);
> return 1;
> }
>
> @@ -5696,6 +5736,7 @@ static int handle_vmoff(struct kvm_vcpu *vcpu)
> return 1;
> free_nested(to_vmx(vcpu));
> skip_emulated_instruction(vcpu);
> + nested_vmx_succeed(vcpu);
> return 1;
> }
>
> @@ -5752,48 +5793,6 @@ static int get_vmx_mem_address(struct kvm_vcpu *vcpu,
> return 0;
> }
>
> -/*
> - * The following 3 functions, nested_vmx_succeed()/failValid()/failInvalid(),
> - * set the success or error code of an emulated VMX instruction, as specified
> - * by Vol 2B, VMX Instruction Reference, "Conventions".
> - */
> -static void nested_vmx_succeed(struct kvm_vcpu *vcpu)
> -{
> - vmx_set_rflags(vcpu, vmx_get_rflags(vcpu)
> - & ~(X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF |
> - X86_EFLAGS_ZF | X86_EFLAGS_SF | X86_EFLAGS_OF));
> -}
> -
> -static void nested_vmx_failInvalid(struct kvm_vcpu *vcpu)
> -{
> - vmx_set_rflags(vcpu, (vmx_get_rflags(vcpu)
> - & ~(X86_EFLAGS_PF | X86_EFLAGS_AF | X86_EFLAGS_ZF |
> - X86_EFLAGS_SF | X86_EFLAGS_OF))
> - | X86_EFLAGS_CF);
> -}
> -
> -static void nested_vmx_failValid(struct kvm_vcpu *vcpu,
> - u32 vm_instruction_error)
> -{
> - if (to_vmx(vcpu)->nested.current_vmptr == -1ull) {
> - /*
> - * failValid writes the error number to the current VMCS, which
> - * can't be done there isn't a current VMCS.
> - */
> - nested_vmx_failInvalid(vcpu);
> - return;
> - }
> - vmx_set_rflags(vcpu, (vmx_get_rflags(vcpu)
> - & ~(X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF |
> - 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 */
> static int handle_vmclear(struct kvm_vcpu *vcpu)
> {
>
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