linux-kernel - Re: [PATCH 0/3] KVM: Fix for a mostly benign gpc WARN

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Message-ID: <ecaf87b40d6da2ca39a5eaf94d2efded2ae3368c.camel@infradead.org>
Date: Fri, 22 Mar 2024 11:39:56 +0000
From: David Woodhouse <dwmw2@...radead.org>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini
 <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzbot+106a4f72b0474e1d1b33@...kaller.appspotmail.com, Paul Durrant
	 <paul@....org>
Subject: Re: [PATCH 0/3] KVM: Fix for a mostly benign gpc WARN

On Tue, 2024-03-19 at 17:15 -0700, Sean Christopherson wrote:
> Fix a bug found by syzkaller, thanks to a new WARN sanity check, where KVM
> marks a gfn_to_pfn_cache as active without actually setting gpc->gpa or any
> other metadata.  On top, harden against _directly_ setting gpc->gpa to KVM's
> magic INVALID_GPA, which would also fail the sanity check.
> 
> Sean Christopherson (3):
>   KVM: Add helpers to consolidate gfn_to_pfn_cache's page split check
>   KVM: Check validity of offset+length of gfn_to_pfn_cache prior to
>     activation
>   KVM: Explicitly disallow activatating a gfn_to_pfn_cache with
>     INVALID_GPA

It looks like these conflict with
https://lore.kernel.org/kvm/20240227115648.3104-9-dwmw2@infradead.org/

Want to arrange them to come after it?

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