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

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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>
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        "srinivas.pandruvada@...ux.intel.com" 
        <srinivas.pandruvada@...ux.intel.com>,
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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
> 
> 
> 
> 
> 
> 
> 
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