linux-kernel - Re: [PATCH 2/3] KVM: x86: simplify handling of PKRU

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Date:   Thu, 24 Aug 2017 20:00:13 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     junkang.fjk@...baba-inc.com, yang.zhang.wz@...il.com
Subject: Re: [PATCH 2/3] KVM: x86: simplify handling of PKRU

On 24.08.2017 12:12, Paolo Bonzini wrote:
> Move it to struct kvm_arch_vcpu, replacing guest_pkru_valid with a
> simple comparison against the host value of the register.  The write of
> PKRU in addition can be skipped if the guest has not enabled the feature.
> Once we do this, we need not test OSPKE in the host anymore, because
> guest_CR4.PKE=1 implies host_CR4.PKE=1.
> 
> The static PKU test is kept to elide the code on older CPUs.

>From what I can tell, this looks good to me!


-- 

Thanks,

David