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Message-ID: <CAMBK9=ayzz3yz-Cbf3vx1=v2bFqQM8Vmyo0NtfoKY0jqGuBk_g@mail.gmail.com>
Date: Mon, 2 Oct 2023 14:46:25 -0700
From: Adam Dunlap <acdunlap@...gle.com>
To: Dave Hansen <dave.hansen@...el.com>
Cc: Nathan Chancellor <nathan@...nel.org>,
linux-kernel@...r.kernel.org, x86@...nel.org,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"H. Peter Anvin" <hpa@...or.com>,
Andy Lutomirski <luto@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Sean Christopherson <seanjc@...gle.com>,
Kim Phillips <kim.phillips@....com>,
Juergen Gross <jgross@...e.com>,
Ashok Raj <ashok.raj@...el.com>,
Joerg Roedel <jroedel@...e.de>,
Tom Lendacky <thomas.lendacky@....com>,
David Hildenbrand <david@...hat.com>,
Mike Rapoport <rppt@...nel.org>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
Nikunj A Dadhania <nikunj@....com>,
Dionna Glaze <dionnaglaze@...gle.com>,
Peter Gonda <pgonda@...gle.com>,
David Rientjes <rientjes@...gle.com>,
Khalid ElMously <khalid.elmously@...onical.com>,
Jacob Xu <jacobhxu@...gle.com>, llvm@...ts.linux.dev
Subject: Re: [PATCH v2 2/2] x86/sev-es: Only set x86_virt_bits to correct value
On Mon, Oct 2, 2023 at 2:41 PM Dave Hansen <dave.hansen@...el.com> wrote:
>
> On 10/2/23 13:04, Nathan Chancellor wrote:
> > On Mon, Sep 11, 2023 at 05:27:03PM -0700, Adam Dunlap wrote:
> >> Instead of setting x86_virt_bits to a possibly-correct value and then
> >> correcting it later, do all the necessary checks before setting it.
> >>
> >> At this point, the #VC handler references boot_cpu_data.x86_virt_bits,
> >> and in the previous version, it would be triggered by the cpuids between
> >> the point at which it is set to 48 and when it is set to the correct
> >> value.
> >>
> >> Suggested-by: Dave Hansen <dave.hansen@...ux.intel.com>
> >> Signed-off-by: Adam Dunlap <acdunlap@...gle.com>
> > Our continuous integration started seeing panics when booting ARCH=i386
> > without KVM after this change landed in -tip as commit fbf6449f84bf
> > ("x86/sev-es: Set x86_virt_bits to the correct value straight away,
> > instead of a two-phase approach"):
>
> I can't reproduce this, but I'm running a gcc-built kernel and I haven't
> tried very hard to replicate your qemu setup.
>
> I did notice, though, that the patch in question forgot to move one
> assignment. Could you see if the attached patch fixes things for you?
I reproduced the issue as Nathan described and your attached patch fixes it
for me.
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