[SRU][mantic:linux-gcp, lunar:linux-gcp][PATCH 0/2] SEV_SNP failure to init

[John Cabaj]

On 9/25/23 1:47 PM, Tim Gardner wrote:
> On 9/25/23 12:39 PM, John Cabaj wrote:
>> BugLink: https://bugs.launchpad.net/bugs/2037316
>>
>> [Impact]
>>
>> * Kernel fails to boot on SEV-SNP instances when compiled with GCC 12.3.0
>>
>> [Fix]
>>
>> * https://lore.kernel.org/lkml/20230912002703.3924521-1-acdunlap@google.com/
>>
>> [Test Case]
>>
>> * Compile tested
>> * Boot tested
>> * Tested by Google
>>
>> [Where things could go wrong]
>>
>> * Patches relatively isolated and maintain similar checking functionality,
>>    just earlier in boot. Likely a low chance of regression.
>>
>> Adam Dunlap (2):
>>    x86/sev-es: Allow copy_from_kernel_nofault in earlier boot
>>    x86/sev-es: Only set x86_virt_bits to correct value
>>
>>   arch/x86/kernel/cpu/common.c | 37 +++++++++++++++++++++---------------
>>   arch/x86/mm/maccess.c        | 19 +++++++++++++-----
>>   2 files changed, 36 insertions(+), 20 deletions(-)
>>
> 
> Is there any reason these patches shouldn't be applied to the generic kernel ? That way all the derivatives are fixed wrt SEV-SNP.

They're simple enough that we could apply to the generic kernel as well, since I know a couple other kernels could use it. GCP needs this for 2023.10.02, so these patches would need ACKs and application by 27-Sep. Might need some coordination with the Stable team.


John