Re: [PATCH v3 0/8] x86: Remove cpu_has_xfeatures() and add AVX-512 xor_gen()
Borislav Petkov <[email protected]>
| Newsgroups | org.infradead.lists.linux-um,org.kernel.vger.linux-crypto,org.kernel.vger.linux-kernel,org.kernel.vger.linux-raid |
|---|---|
| Message-ID | <20260814003517.GBan5ixaTArd0Sf6X3@fat_crate.local> |
On Wed, Aug 12, 2026 at 07:14:58PM -0700, Eric Biggers wrote:
> This series consolidates and cleans up how the kernel handles CPU
> feature flags for AVX and AVX-512 when the underlying OS or hypervisor
> (if any) doesn't enable the required xstate features in XCR0.
>
> Specifically, it makes the checks for xstate features be done in a
> single place at boot time for both UML and native x86, instead of
> everywhere kernel code wants to check for AVX or AVX-512 support.
>
> Patch 8 then adds an AVX-512 optimized implementation of xor_gen() for
> RAID, which had been blocked on confusion around cpu_has_xfeatures() and
> its lack of implementation on UML.
Sashiko complains about a missing VZEROUPPER there in patch 8:
https://sashiko.dev/#/patchset/20260813021506.55129-1-ebiggers%40kernel.org
Otherwise, LGTM.
I can queue them all into tip after the merge window opens.
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette