linux-kernel - Re: [PATCH] KVM: X86: Make fpu allocation a common function

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Message-ID: <d14d22e2-d74c-ed73-b5bb-3ed5eb087deb@redhat.com>
Date:   Tue, 15 Oct 2019 11:28:38 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Xiaoyao Li <xiaoyao.li@...el.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Radim Krčmář <rkrcmar@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Jim Mattson <jmattson@...gle.com>
Subject: Re: [PATCH] KVM: X86: Make fpu allocation a common function

On 14/10/19 18:58, Vitaly Kuznetsov wrote:
> Xiaoyao Li <xiaoyao.li@...el.com> writes:
> 
>> They are duplicated codes to create vcpu.arch.{user,guest}_fpu in VMX
>> and SVM. Make them common functions.
>>
>> No functional change intended.
> Would it rather make sense to move this code to
> kvm_arch_vcpu_create()/kvm_arch_vcpu_destroy() instead?
> 

user_fpu could be made percpu too...  That would save a bit of memory
for each vCPU.  I'm holding on Xiaoyao's patch because a lot of the code
he's touching would go away then.

Paolo