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Message-ID: <01fc0ac9-f159-d3df-6c8c-8f8122fe31ea@redhat.com>
Date: Thu, 8 Apr 2021 14:37:45 +0200
From: Paolo Bonzini <pbonzini@...hat.com>
To: Vitaly Kuznetsov <vkuznets@...hat.com>,
Siddharth Chandrasekaran <sidcha@...zon.de>
Cc: Alexander Graf <graf@...zon.com>,
Evgeny Iakovlev <eyakovl@...zon.de>, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org,
Sean Christopherson <seanjc@...gle.com>,
Wanpeng Li <wanpengli@...cent.com>,
Jim Mattson <jmattson@...gle.com>,
Joerg Roedel <joro@...tes.org>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 3/4] KVM: x86: kvm_hv_flush_tlb use inputs from XMM
registers
On 08/04/21 14:01, Vitaly Kuznetsov wrote:
>
> Also, we can probably defer kvm_hv_hypercall_read_xmm() until we know
> how many regs we actually need to not read them all (we will always
> need xmm[0] I guess so we can as well read it here).
The cost is get/put FPU, so I think there's not much to gain from that.
Paolo
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