linux-kernel - Re: [PATCH RFC v1 17/20] KVM: x86: Prepare APX state setting in XCR0

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Message-ID: <7e964169-192b-4f16-944a-65b268ef7696@intel.com>
Date: Thu, 13 Nov 2025 15:32:11 -0800
From: "Chang S. Bae" <chang.seok.bae@...el.com>
To: Paolo Bonzini <pbonzini@...hat.com>, <kvm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: <seanjc@...gle.com>, <chao.gao@...el.com>, <zhao1.liu@...el.com>
Subject: Re: [PATCH RFC v1 17/20] KVM: x86: Prepare APX state setting in XCR0

On 11/11/2025 8:59 AM, Paolo Bonzini wrote:
> 
> You should also adjust set_xcr to reject setting BNDREGS and APX 

	/* MPX and APX conflict in the non-compacted XSAVE format */
	if (xcr0 & XFEATURE_MASK_BNDREGS && xcr0 & XFEATURE_MASK_APX)
		return 1;

> together (QEMU should also reject MPX and APX together in CPUID, but KVM 
> doesn't care enough about invalid CPUID configuration).
Zhao, please ensure this on your QEMU patches.