linux-kernel - Re: [PATCH v8 4/6] x86/fpu: Remove xfd argument from __fpstate

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Message-ID: <aDjQ+dPeBsp7epmx@AUSJOHALLEN.amd.com>
Date: Thu, 29 May 2025 16:26:17 -0500
From: John Allen <john.allen@....com>
To: Chao Gao <chao.gao@...el.com>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	tglx@...utronix.de, dave.hansen@...el.com, seanjc@...gle.com,
	pbonzini@...hat.com, peterz@...radead.org,
	rick.p.edgecombe@...el.com, weijiang.yang@...el.com, bp@...en8.de,
	chang.seok.bae@...el.com, xin3.li@...el.com,
	Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>, Kees Cook <kees@...nel.org>,
	Eric Biggers <ebiggers@...gle.com>,
	Stanislav Spassov <stanspas@...zon.de>,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH v8 4/6] x86/fpu: Remove xfd argument from
 __fpstate_reset()

On Thu, May 22, 2025 at 08:10:07AM -0700, Chao Gao wrote:
> The initial values for fpstate::xfd differ between guest and host fpstates.
> Currently, the initial values are passed as an argument to
> __fpstate_reset(). But, __fpstate_reset() already assigns different default
> features and sizes based on the type of fpstates (i.e., guest or host). So,
> handle fpstate::xfd in a similar way to highlight the differences in the
> initial xfd value between guest and host fpstates
> 
> Suggested-by: Sean Christopherson <seanjc@...gle.com>
> Signed-off-by: Chao Gao <chao.gao@...el.com>

Reviewed-by: John Allen <john.allen@....com>