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Re: [RFC PATCH v2 05/10] x86: Keep a copy of XSAVE area size
- To: Tu Dinh <ngoc-tu.dinh@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 14 Jan 2025 17:56:56 +0100
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- Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 14 Jan 2025 16:57:03 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02.01.2025 09:45, Tu Dinh wrote:
> Signed-off-by: Tu Dinh <ngoc-tu.dinh@xxxxxxxxxx>
This needs a non-empty description to clarify why this would be needed.
Jan
> --- a/xen/arch/x86/include/asm/domain.h
> +++ b/xen/arch/x86/include/asm/domain.h
> @@ -638,6 +638,7 @@ struct arch_vcpu
> * #NM handler, we XRSTOR the states we XSAVE-ed;
> */
> struct xsave_struct *xsave_area;
> + unsigned int xsave_area_size;
> uint64_t xcr0;
> /* Accumulated eXtended features mask for using XSAVE/XRESTORE by Xen
> * itself, as we can never know whether guest OS depends on content
> diff --git a/xen/arch/x86/xstate.c b/xen/arch/x86/xstate.c
> index af9e345a7a..baae8e1a13 100644
> --- a/xen/arch/x86/xstate.c
> +++ b/xen/arch/x86/xstate.c
> @@ -550,6 +550,7 @@ int xstate_alloc_save_area(struct vcpu *v)
> save_area->fpu_sse.mxcsr = MXCSR_DEFAULT;
>
> v->arch.xsave_area = save_area;
> + v->arch.xsave_area_size = size;
> v->arch.xcr0 = 0;
> v->arch.xcr0_accum = 0;
>
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