linux-kernel - Re: [PATCH 03/16] KVM: x86: Define more SEV+ page fault error bits/flags for #NPF

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Date: Wed, 28 Feb 2024 08:16:23 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Dongli Zhang <dongli.zhang@...cle.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Yan Zhao <yan.y.zhao@...el.com>, Isaku Yamahata <isaku.yamahata@...el.com>, 
	Michael Roth <michael.roth@....com>, Yu Zhang <yu.c.zhang@...ux.intel.com>, 
	Chao Peng <chao.p.peng@...ux.intel.com>, Fuad Tabba <tabba@...gle.com>, 
	David Matlack <dmatlack@...gle.com>
Subject: Re: [PATCH 03/16] KVM: x86: Define more SEV+ page fault error
 bits/flags for #NPF

On Tue, Feb 27, 2024, Dongli Zhang wrote:
> 
> 
> On 2/27/24 18:41, Sean Christopherson wrote:
> > Define more #NPF error code flags that are relevant to SEV+ (mostly SNP)
> > guests, as specified by the APM:
> > 
> >  * Bit 34 (ENC):   Set to 1 if the guest’s effective C-bit was 1, 0 otherwise.
> >  * Bit 35 (SIZEM): Set to 1 if the fault was caused by a size mismatch between
> >                    PVALIDATE or RMPADJUST and the RMP, 0 otherwise.
> >  * Bit 36 (VMPL):  Set to 1 if the fault was caused by a VMPL permission
> >                    check failure, 0 otherwise.
> >  * Bit 37 (SSS):   Set to VMPL permission mask SSS (bit 4) value if VmplSSS is
> >                    enabled.
> 
> The above bits 34-37 do not match with the bits 31,34-36 in the patch.

Doh, good catch.  I copy+pasted this from the APM, but the RMP bit is defined
slightly earlier in the APM, and I missed SSS.  I'll fixup the changelog to talk
about RMO, and I think I'll add SSS in v2; at the very least, having the #define
will make it clear which bits are used.

Thanks!