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Message-ID: <a650200e-5fd9-4ae3-a1e0-d676e96b8490@linux.intel.com>
Date: Thu, 22 Feb 2024 22:37:19 +0800
From: Binbin Wu <binbin.wu@...ux.intel.com>
To: isaku.yamahata@...el.com
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
isaku.yamahata@...il.com, Paolo Bonzini <pbonzini@...hat.com>,
erdemaktas@...gle.com, Sean Christopherson <seanjc@...gle.com>,
Sagi Shahar <sagis@...gle.com>, Kai Huang <kai.huang@...el.com>,
chen.bo@...el.com, hang.yuan@...el.com, tina.zhang@...el.com
Subject: Re: [PATCH v18 074/121] KVM: TDX: complete interrupts after tdexit
On 1/23/2024 7:53 AM, isaku.yamahata@...el.com wrote:
> From: Isaku Yamahata <isaku.yamahata@...el.com>
>
> This corresponds to VMX __vmx_complete_interrupts(). Because TDX
> virtualize vAPIC, KVM only needs to care NMI injection.
Nit: complete -> Complete in shortlog.
Reviewed-by: Binbin Wu <binbin.wu@...ux.intel.com>
>
> Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
> Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>
> ---
> arch/x86/kvm/vmx/tdx.c | 10 ++++++++++
> arch/x86/kvm/vmx/tdx.h | 2 ++
> 2 files changed, 12 insertions(+)
>
> diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
> index 71c6fc10e8c4..3b2ba9f974be 100644
> --- a/arch/x86/kvm/vmx/tdx.c
> +++ b/arch/x86/kvm/vmx/tdx.c
> @@ -585,6 +585,14 @@ void tdx_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
> */
> }
>
> +static void tdx_complete_interrupts(struct kvm_vcpu *vcpu)
> +{
> + /* Avoid costly SEAMCALL if no nmi was injected */
> + if (vcpu->arch.nmi_injected)
> + vcpu->arch.nmi_injected = td_management_read8(to_tdx(vcpu),
> + TD_VCPU_PEND_NMI);
> +}
> +
> struct tdx_uret_msr {
> u32 msr;
> unsigned int slot;
> @@ -713,6 +721,8 @@ fastpath_t tdx_vcpu_run(struct kvm_vcpu *vcpu)
> vcpu->arch.regs_avail &= ~VMX_REGS_LAZY_LOAD_SET;
> trace_kvm_exit(vcpu, KVM_ISA_VMX);
>
> + tdx_complete_interrupts(vcpu);
> +
> return EXIT_FASTPATH_NONE;
> }
>
> diff --git a/arch/x86/kvm/vmx/tdx.h b/arch/x86/kvm/vmx/tdx.h
> index 883eb05d207f..9082a2604ec6 100644
> --- a/arch/x86/kvm/vmx/tdx.h
> +++ b/arch/x86/kvm/vmx/tdx.h
> @@ -201,6 +201,8 @@ TDX_BUILD_TDVPS_ACCESSORS(16, VMCS, vmcs);
> TDX_BUILD_TDVPS_ACCESSORS(32, VMCS, vmcs);
> TDX_BUILD_TDVPS_ACCESSORS(64, VMCS, vmcs);
>
> +TDX_BUILD_TDVPS_ACCESSORS(8, MANAGEMENT, management);
> +
> static __always_inline u64 td_tdcs_exec_read64(struct kvm_tdx *kvm_tdx, u32 field)
> {
> struct tdx_module_args out;
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