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Message-ID: <f4905c32f4054d4ce254b3acb9339aa1c59728b8.camel@amazon.de>
Date:   Thu, 3 Aug 2023 18:27:56 +0000
From:   "Schander, Johanna 'Mimoja' Amelie" <mimoja@...zon.de>
To:     "Graf (AWS), Alexander" <graf@...zon.de>,
        "michael.roth@....com" <michael.roth@....com>,
        "mimoja@...oja.de" <mimoja@...oja.de>
CC:     "tglx@...utronix.de" <tglx@...utronix.de>,
        "srinivas.pandruvada@...ux.intel.com" 
        <srinivas.pandruvada@...ux.intel.com>,
        "tobin@....com" <tobin@....com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "alpergun@...gle.com" <alpergun@...gle.com>,
        "jmattson@...gle.com" <jmattson@...gle.com>,
        "luto@...nel.org" <luto@...nel.org>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "slp@...hat.com" <slp@...hat.com>,
        "dovmurik@...ux.ibm.com" <dovmurik@...ux.ibm.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "rientjes@...gle.com" <rientjes@...gle.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "pgonda@...gle.com" <pgonda@...gle.com>,
        "thomas.lendacky@....com" <thomas.lendacky@....com>,
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        "x86@...nel.org" <x86@...nel.org>, "bp@...en8.de" <bp@...en8.de>,
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        "marcorr@...gle.com" <marcorr@...gle.com>,
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        "ashish.kalra@....com" <ashish.kalra@....com>,
        "linux-coco@...ts.linux.dev" <linux-coco@...ts.linux.dev>,
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        "mingo@...hat.com" <mingo@...hat.com>,
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        "jarkko@...nel.org" <jarkko@...nel.org>,
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        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH RFC v8 00/56] Add AMD Secure Nested Paging (SEV-SNP)
 Hypervisor Support

We discovered that the kdump crashkernel would not work with our SEV-
SNP configuration.

After reading the device table from the previour kernel we would
see a lot of
  AMD-Vi: Completion-Wait loop timed out
errors and finally crash:
  Kernel panic - not syncing: timer doesn't work through Interrupt-
remapped IO-APIC

We found that disabeling SNP in the outgoing (crashing) kernel
would enable the crashkernel to take over the iommu config and
boot from there.

We opened a PR over on github against the rfc-v9 branch to discuss
the issue:
https://github.com/AMDESE/linux/pull/5

Cheers Johanna







Amazon Development Center Germany GmbH
Krausenstr. 38
10117 Berlin
Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss
Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B
Sitz: Berlin
Ust-ID: DE 289 237 879


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