From: Dave Hansen <dave.hansen@intel.com>
To: Jing Liu <jing2.liu@linux.intel.com>, pbonzini@redhat.com
Cc: Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1] kvm: x86: Revise guest_fpu xcomp_bv field
Date: Mon, 8 Feb 2021 07:23:13 -0800 [thread overview]
Message-ID: <4e4b37d1-e2f8-6757-003c-d19ae8184088@intel.com> (raw)
In-Reply-To: <20210208161659.63020-1-jing2.liu@linux.intel.com>
On 2/8/21 8:16 AM, Jing Liu wrote:
> -#define XSTATE_COMPACTION_ENABLED (1ULL << 63)
> -
> static void fill_xsave(u8 *dest, struct kvm_vcpu *vcpu)
> {
> struct xregs_state *xsave = &vcpu->arch.guest_fpu->state.xsave;
> @@ -4494,7 +4492,8 @@ static void load_xsave(struct kvm_vcpu *vcpu, u8 *src)
> /* Set XSTATE_BV and possibly XCOMP_BV. */
> xsave->header.xfeatures = xstate_bv;
> if (boot_cpu_has(X86_FEATURE_XSAVES))
> - xsave->header.xcomp_bv = host_xcr0 | XSTATE_COMPACTION_ENABLED;
> + xsave->header.xcomp_bv = XCOMP_BV_COMPACTED_FORMAT |
> + xfeatures_mask_all;
Are 'host_xcr0' and 'xfeatures_mask_all' really interchangeable? If so,
shouldn't we just remove 'host_xcr0' everywhere?
next prev parent reply other threads:[~2021-02-08 15:29 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-08 16:16 [PATCH v1] kvm: x86: Revise guest_fpu xcomp_bv field Jing Liu
2021-02-08 15:23 ` Dave Hansen [this message]
2021-02-08 17:24 ` Sean Christopherson
2021-02-22 3:21 ` Liu, Jing2
2021-02-22 16:06 ` Sean Christopherson
2021-02-23 3:06 ` Liu, Jing2
2021-02-24 20:40 ` Sean Christopherson
2021-02-25 2:02 ` Liu, Jing2
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