linux-kernel - Re: AMD SNP guest kdump broken since linuxnext-20250908

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Message-ID: <20250924144549.GAaNQEHc-wy0M_JTtJ@fat_crate.local>
Date: Wed, 24 Sep 2025 16:45:49 +0200
From: Borislav Petkov <bp@...en8.de>
To: "Aithal, Srikanth" <sraithal@....com>
Cc: Ard Biesheuvel <ardb@...nel.org>,
	Sean Christopherson <seanjc@...gle.com>,
	Linux-Next Mailing List <linux-next@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>,
	Ashish Kalra <Ashish.Kalra@....com>,
	Tom Lendacky <thomas.lendacky@....com>
Subject: Re: AMD SNP guest kdump broken since linuxnext-20250908

On Wed, Sep 24, 2025 at 08:13:35PM +0530, Aithal, Srikanth wrote:
> On 9/24/2025 7:45 PM, Ard Biesheuvel wrote:
> > Hi,
> > 
> > On Wed, 24 Sept 2025 at 15:25, Sean Christopherson <seanjc@...gle.com> wrote:
> > > 
> > > +Ard and Boris (and Tom for good measure)
> > > 
> > 
> > Thanks for the cc, and apologies for the breakage.
> > 
> > Does this help?
> > 
> > --- a/arch/x86/boot/startup/sev-startup.c
> > +++ b/arch/x86/boot/startup/sev-startup.c
> > @@ -44,7 +44,7 @@
> >   /* Include code shared with pre-decompression boot stage */
> >   #include "sev-shared.c"
> > 
> > -void __init
> > +void
> >   early_set_pages_state(unsigned long vaddr, unsigned long paddr,
> >                        unsigned long npages, const struct psc_desc *desc)
> >   {
> 
> Tested this patch on top of 6.17.0-rc7-next-20250923 [https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tag/?h=next-20250923].
> 
> This patch fixes the issue reported for the SNP guest type. It was also
> tested on [normal, SEV, SEV-ES] guest types, and kdump works fine on all.
> 
> Reported-by: Srikanth Aithal <Srikanth.Aithal@....com>
> Tested-by: Srikanth Aithal <Srikanth.Aithal@....com>

Cool, thanks for testing.

Ard, pls send a proper patch so that I can slap it ontop.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette