ACK: [SRU][Q:linux-aws][PATCH 0/1] SEV-SNP instances on AWS fail to boot

[Benjamin Wheeler]

Acked-by: Benjamin Wheeler <benjamin.wheeler at canonical.com>

On Thu, Jan 8, 2026 at 9:05 AM Magali Lemes <magali.lemes at canonical.com>
wrote:

> BugLink: https://bugs.launchpad.net/bugs/2137714
>
> [Impact]
> AWS instances with SEV-SNP enabled running the 6.17 kernel fail to boot
> following upstream commit 81256a50aa0f ("x86/mm: Make
> memremap(MEMREMAP_WB) map
> memory as encrypted by default"). The failure occurs because the vmgenid
> driver relies on memory that must be shared, but is now mapped as
> encrypted by
> default.
>
> [Fix]
> Clean cherry-pick of bb9ff576fdff ("virt: vmgenid: remap memory as
> decrypted")
> from linux-next.
>
> [Test Plan]
> Compile the kernel with this patch applied and boot test on AWS c7a.8xlarge
> instances with SEV-SNP enabled and disabled, verifying that the system
> boots
> successfully in both configurations.
>
> [Where problems could occur]
> This patch only touches the vmgenid driver, and only affects the memory
> attributes of the vmgenid mapping. However, incorrect assumptions about the
> sharing requirements of the vmgenid memory region could potentially lead to
> loss of vmgenid functionality or boot failures.
>
> Vitaly Kuznetsov (1):
>   virt: vmgenid: remap memory as decrypted
>
>  drivers/virt/vmgenid.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> --
> 2.34.1
>
>
> --
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> kernel-team at lists.ubuntu.com
> https://lists.ubuntu.com/mailman/listinfo/kernel-team
>
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