linux-kernel - Re: [RFC PATCH v5 013/104] KVM: TDX: Add TDX "architectural" error codes

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Message-ID: <2e317833-2f43-d8b2-1b0a-cd4cacf79695@redhat.com>
Date:   Sun, 13 Mar 2022 15:08:47 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     isaku.yamahata@...el.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     isaku.yamahata@...il.com, Jim Mattson <jmattson@...gle.com>,
        erdemaktas@...gle.com, Connor Kuehl <ckuehl@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>
Subject: Re: [RFC PATCH v5 013/104] KVM: TDX: Add TDX "architectural" error
 codes

On 3/4/22 20:48, isaku.yamahata@...el.com wrote:
> From: Sean Christopherson <sean.j.christopherson@...el.com>
> 
> Add error codes for the TDX SEAMCALLs both for TDX VMM side for TDH
> SEAMCALL and TDX guest side for TDG.VP.VMCALL.  KVM issues the TDX
> SEAMCALLs and checks its error code.  KVM handles hypercall from the TDX
> guest and may return an error.  So error code for the TDX guest is also
> needed.
> 
> TDX SEAMCALL uses bits 31:0 to return more information, so these error
> codes will only exactly match RAX[63:32].  Error codes for TDG.VP.VMCALL is
> defined by TDX Guest-Host-Communication interface spec.
> 
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>

Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>


> ---
>   arch/x86/kvm/vmx/tdx_errno.h | 29 +++++++++++++++++++++++++++++
>   1 file changed, 29 insertions(+)
>   create mode 100644 arch/x86/kvm/vmx/tdx_errno.h
> 
> diff --git a/arch/x86/kvm/vmx/tdx_errno.h b/arch/x86/kvm/vmx/tdx_errno.h
> new file mode 100644
> index 000000000000..5c878488795d
> --- /dev/null
> +++ b/arch/x86/kvm/vmx/tdx_errno.h
> @@ -0,0 +1,29 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/* architectural status code for SEAMCALL */
> +
> +#ifndef __KVM_X86_TDX_ERRNO_H
> +#define __KVM_X86_TDX_ERRNO_H
> +
> +#define TDX_SEAMCALL_STATUS_MASK		0xFFFFFFFF00000000ULL
> +
> +/*
> + * TDX SEAMCALL Status Codes (returned in RAX)
> + */
> +#define TDX_SUCCESS				0x0000000000000000ULL
> +#define TDX_NON_RECOVERABLE_VCPU		0x4000000100000000ULL
> +#define TDX_INTERRUPTED_RESUMABLE		0x8000000300000000ULL
> +#define TDX_LIFECYCLE_STATE_INCORRECT		0xC000060700000000ULL
> +#define TDX_VCPU_NOT_ASSOCIATED			0x8000070200000000ULL
> +#define TDX_KEY_GENERATION_FAILED		0x8000080000000000ULL
> +#define TDX_KEY_STATE_INCORRECT			0xC000081100000000ULL
> +#define TDX_KEY_CONFIGURED			0x0000081500000000ULL
> +#define TDX_EPT_WALK_FAILED			0xC0000B0000000000ULL
> +
> +/*
> + * TDG.VP.VMCALL Status Codes (returned in R10)
> + */
> +#define TDG_VP_VMCALL_SUCCESS			0x0000000000000000ULL
> +#define TDG_VP_VMCALL_INVALID_OPERAND		0x8000000000000000ULL
> +#define TDG_VP_VMCALL_TDREPORT_FAILED		0x8000000000000001ULL
> +
> +#endif /* __KVM_X86_TDX_ERRNO_H */