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From: Paolo Bonzini <pbonzini@redhat.com>
To: Vitaly Kuznetsov <vkuznets@redhat.com>,
	Siddharth Chandrasekaran <sidcha@amazon.de>
Cc: Alexander Graf <graf@amazon.com>,
	Evgeny Iakovlev <eyakovl@amazon.de>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	Sean Christopherson <seanjc@google.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>
Subject: Re: [PATCH 3/4] KVM: x86: kvm_hv_flush_tlb use inputs from XMM registers
Date: Thu, 8 Apr 2021 14:37:45 +0200	[thread overview]
Message-ID: <01fc0ac9-f159-d3df-6c8c-8f8122fe31ea@redhat.com> (raw)
In-Reply-To: <87eefl7zp4.fsf@vitty.brq.redhat.com>

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


  reply	other threads:[~2021-04-08 12:37 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20210407211954.32755-1-sidcha@amazon.de>
2021-04-07 21:19 ` [PATCH 1/4] KVM: x86: Move FPU register accessors into fpu.h Siddharth Chandrasekaran
2021-04-07 21:19 ` [PATCH 2/4] KVM: hyper-v: Collect hypercall params into struct Siddharth Chandrasekaran
2021-04-07 21:19 ` [PATCH 3/4] KVM: x86: kvm_hv_flush_tlb use inputs from XMM registers Siddharth Chandrasekaran
2021-04-08 12:01   ` Vitaly Kuznetsov
2021-04-08 12:37     ` Paolo Bonzini [this message]
2021-04-08 12:52       ` Vitaly Kuznetsov
2021-04-07 21:19 ` [PATCH 4/4] KVM: hyper-v: Advertise support for fast XMM hypercalls Siddharth Chandrasekaran
2021-04-08 12:05   ` Vitaly Kuznetsov
2021-04-08 14:20     ` Siddharth Chandrasekaran
2021-04-08 14:44       ` Vitaly Kuznetsov
2021-04-08 15:52         ` Siddharth Chandrasekaran
2021-04-09  7:38           ` Vitaly Kuznetsov
2021-04-09  7:55             ` Siddharth Chandrasekaran
2021-04-12  8:11         ` Siddharth Chandrasekaran
2021-04-12 11:29           ` Vitaly Kuznetsov
2021-04-08 15:44       ` Wei Liu
2021-04-08 15:56         ` Siddharth Chandrasekaran

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