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Message-ID: <fbfb1377-a6e7-a0c0-2001-606c6529ce0f@redhat.com>
Date: Fri, 10 Dec 2021 17:23:22 +0100
From: Paolo Bonzini <pbonzini@...hat.com>
To: Yang Zhong <yang.zhong@...el.com>, x86@...nel.org,
kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
dave.hansen@...ux.intel.com
Cc: seanjc@...gle.com, jun.nakajima@...el.com, kevin.tian@...el.com,
jing2.liu@...ux.intel.com, jing2.liu@...el.com
Subject: Re: [PATCH 15/19] kvm: x86: Save and restore guest XFD_ERR properly
On 12/8/21 01:03, Yang Zhong wrote:
> kvm_steal_time_set_preempted(vcpu);
> srcu_read_unlock(&vcpu->kvm->srcu, idx);
>
> + if (vcpu->preempted)
> + fpu_save_guest_xfd_err(&vcpu->arch.guest_fpu);
> +
Instead of checking vcpu->preempted, can you instead check if the active
FPU is the guest FPU? That is, save if
current->thread.fpu->fpstate->is_guest?
Paolo
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