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Date: Fri, 27 Aug 2021 22:17:25 +0200
From: Borislav Petkov <bp@alien8.de>
To: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>, x86@kernel.org,
	linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
	linux-efi@vger.kernel.org, platform-driver-x86@vger.kernel.org,
	linux-coco@lists.linux.dev, linux-mm@kvack.org,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Joerg Roedel <jroedel@suse.de>,
	"H. Peter Anvin" <hpa@zytor.com>, Ard Biesheuvel <ardb@kernel.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Sean Christopherson <seanjc@google.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>,
	Andy Lutomirski <luto@kernel.org>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Sergio Lopez <slp@redhat.com>, Peter Gonda <pgonda@google.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
	David Rientjes <rientjes@google.com>,
	Dov Murik <dovmurik@linux.ibm.com>,
	Tobin Feldman-Fitzthum <tobin@ibm.com>,
	Michael Roth <michael.roth@amd.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	"Kirill A . Shutemov" <kirill@shutemov.name>,
	Andi Kleen <ak@linux.intel.com>, tony.luck@intel.com,
	marcorr@google.com, sathyanarayanan.kuppuswamy@linux.intel.com
Subject: Re: [PATCH Part1 v5 33/38] x86/sev: Provide support for SNP guest
 request NAEs
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References: <20210820151933.22401-1-brijesh.singh@amd.com>
 <20210820151933.22401-34-brijesh.singh@amd.com>
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 <4acd17bc-bdb0-c4cc-97af-8842f8836c8e@amd.com>
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In-Reply-To: <20005c9e-fd82-5c96-7bfb-8b072e5d66e6@amd.com>

On Fri, Aug 27, 2021 at 02:57:11PM -0500, Tom Lendacky wrote:
> The main thing about this is that it is an error code from the HV on
> extended guest requests. The HV error code sits in the high-order 32-bits of
> the SW_EXIT_INFO_2 field. So defining it either way seems a bit confusing.
> To me, the value should just be 1ULL and then it should be shifted when
> assigning it to the SW_EXIT_INFO_2.

Err, that's from the GHCB spec:

"The hypervisor must validate that the guest has supplied enough pages

...

certificate data in the RBX register and set the SW_EXITINFO2 field to
0x0000000100000000."

So if you wanna do the above, you need to fix the spec first. I'd say.

:-)

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette