linux-kernel - Re: [PATCH v2 08/10] KVM: x86/mmu: Pass around full 64-bit error code for KVM page faults

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Message-ID: <ZiBU-3PlL4dp3nFP@google.com>
Date: Wed, 17 Apr 2024 16:02:19 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Paolo Bonzini <pbonzini@...hat.com>
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org, 
	isaku.yamahata@...el.com, xiaoyao.li@...el.com, binbin.wu@...ux.intel.com, 
	chao.gao@...el.com, Michael Roth <michael.roth@....com>
Subject: Re: [PATCH v2 08/10] KVM: x86/mmu: Pass around full 64-bit error code
 for KVM page faults

On Tue, Apr 16, 2024, Paolo Bonzini wrote:
> From: Isaku Yamahata <isaku.yamahata@...el.com>
> 
> In some cases the full 64-bit error code for the KVM page fault will be
> needed to determine things like whether or not a fault was for a private
> or shared guest page, so update related code to accept the full 64-bit
> value so it can be plumbed all the way through to where it is needed.
> 
> The use of lower_32_bits() moves from kvm_mmu_page_fault() to
> FNAME(page_fault), since walking is independent of the data in the
> upper bits of the error code.

Heh, I prefer my version, which is already in kvm/queue :-)

0a5df50a2d6b ("KVM: x86/mmu: Pass full 64-bit error code when handling page faults")