linux-kernel - Re: [PATCH 5.10 005/289] KVM: x86/mmu: Remove the defunct update

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Message-ID: <20210519195651.GA14212@amd>
Date:   Wed, 19 May 2021 21:56:52 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Yu Zhang <yu.c.zhang@...el.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH 5.10 005/289] KVM: x86/mmu: Remove the defunct
 update_pte() paging hook

Hi!

> From: Sean Christopherson <seanjc@...gle.com>
> 
> commit c5e2184d1544f9e56140791eff1a351bea2e63b9 upstream.
> 
> Remove the update_pte() shadow paging logic, which was obsoleted by
> commit 4731d4c7a077 ("KVM: MMU: out of sync shadow core"), but never
> removed.  As pointed out by Yu, KVM never write protects leaf page

First, this is cleanup, not a bugfix.

Second, AFAICT 4731d4c7a077 ("KVM: MMU: out of sync shadow core") is
not in 5.10, so this will break stuff according to the changelog.

Best regards,
								Pavel
								
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DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
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