linux-kernel - Re: ping Re: [PATCH v4 0/2] x86: Fix ARCH_REQ_XCOMP

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Date:   Wed, 23 Mar 2022 15:24:16 +0100
From:   Paolo Bonzini <bonzini@....org>
To:     Thomas Gleixner <tglx@...utronix.de>, dave.hansen@...ux.intel.com
Cc:     yang.zhong@...el.com, ravi.v.shankar@...el.com, mingo@...hat.com,
        "Chang S. Bae" <chang.seok.bae@...el.com>, bp@...en8.de,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        KVM list <kvm@...r.kernel.org>
Subject: Re: ping Re: [PATCH v4 0/2] x86: Fix ARCH_REQ_XCOMP_PERM and update
 the test

On 3/23/22 13:55, Thomas Gleixner wrote:
> --- a/arch/x86/kernel/fpu/xstate.c
> +++ b/arch/x86/kernel/fpu/xstate.c
> @@ -1625,6 +1625,8 @@ static int __xstate_request_perm(u64 per
>   
>   	/* Calculate the resulting kernel state size */
>   	mask = permitted | requested;
> +	/* Take supervisor states into account */
> +	mask |= xfeatures_mask_supervisor();
>   	ksize = xstate_calculate_size(mask, compacted);
>   

This should be only added in for the !guest case.

Paolo