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Re: [PATCH for-4.18] x86/cpuid: Fix handling of XSAVE dynamic leaves
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 20 Jun 2024 14:10:55 +0200
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- Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 20 Jun 2024 12:11:30 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 20.06.2024 13:14, Andrew Cooper wrote:
> [ This is a minimal backport of commit 71cacfb035f4 ("x86/cpuid: Fix handling
> of XSAVE dynamic leaves") to fix the bugs without depending on large rework
> of
> XSTATE handling in Xen 4.19 ]
>
> First, if XSAVE is available in hardware but not visible to the guest, the
> dynamic leaves shouldn't be filled in.
>
> Second, the comment concerning XSS state is wrong. VT-x doesn't manage
> host/guest state automatically, but there is provision for "host only" bits to
> be set, so the implications are still accurate.
>
> In Xen 4.18, no XSS states are supported, so it's safe to keep deferring to
> real hardware.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
I'll try to not forget to include this in my next backporting batch. Thanks
for getting this sorted so quickly.
Jan
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