linux-kernel - Re: [PATCH RFC v8 00/56] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <d3f35229-7ead-a133-93dd-8b41a1c94ffc@amd.com>
Date:   Thu, 3 Aug 2023 20:01:56 -0500
From:   "Kalra, Ashish" <ashish.kalra@....com>
To:     "Schander, Johanna 'Mimoja' Amelie" <mimoja@...zon.de>,
        "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>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "x86@...nel.org" <x86@...nel.org>, "bp@...en8.de" <bp@...en8.de>,
        "dgilbert@...hat.com" <dgilbert@...hat.com>,
        "seanjc@...gle.com" <seanjc@...gle.com>,
        "vkuznets@...hat.com" <vkuznets@...hat.com>,
        "marcorr@...gle.com" <marcorr@...gle.com>,
        "vbabka@...e.cz" <vbabka@...e.cz>,
        "linux-coco@...ts.linux.dev" <linux-coco@...ts.linux.dev>,
        "nikunj.dadhania@....com" <nikunj.dadhania@....com>,
        "hpa@...or.com" <hpa@...or.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "jroedel@...e.de" <jroedel@...e.de>,
        "kirill@...temov.name" <kirill@...temov.name>,
        "jarkko@...nel.org" <jarkko@...nel.org>,
        "ardb@...nel.org" <ardb@...nel.org>,
        "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

Please look at the response on github and followup discussion.

Thanks,
Ashish

On 8/3/2023 1:27 PM, Schander, Johanna 'Mimoja' Amelie wrote:
> 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
> 
>