From: Siddharth Chandrasekaran <sidcha@amazon.de>
To: Wei Liu <wei.liu@kernel.org>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "Borislav Petkov" <bp@alien8.de>,
<x86@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
"Alexander Graf" <graf@amazon.com>,
Evgeny Iakovlev <eyakovl@amazon.de>,
Liran Alon <liran@amazon.com>,
Ioannis Aslanidis <iaslan@amazon.de>,
<linux-hyperv@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<kvm@vger.kernel.org>
Subject: Re: [PATCH v2 3/4] KVM: x86: kvm_hv_flush_tlb use inputs from XMM registers
Date: Tue, 13 Apr 2021 11:09:41 +0200 [thread overview]
Message-ID: <20210413090906.GA25751@u366d62d47e3651.ant.amazon.com> (raw)
In-Reply-To: <20210412201319.lnohqg6r54p6embb@liuwe-devbox-debian-v2>
On Mon, Apr 12, 2021 at 08:13:19PM +0000, Wei Liu wrote:
> On Mon, Apr 12, 2021 at 07:00:16PM +0200, Siddharth Chandrasekaran wrote:
> > +
> > +static inline void kvm_hv_hypercall_read_xmm(struct kvm_hv_hcall *hc)
>
> Do you really need inline here? The compiler should be smart enough to
> inline this function if necessary.
Removed.
> > +{
> > + int reg;
> > +
> > + kvm_fpu_get();
> > + for (reg = 0; reg < KVM_HV_HYPERCALL_MAX_XMM_REGISTERS; reg++)
> > + _kvm_read_sse_reg(reg, &hc->xmm[reg]);
> > + kvm_fpu_put();
> > + hc->xmm_dirty = false;
>
> There is no code that sets xmm_dirty to true? What am I missing? I guess
> that's because you haven't implemented the hypercalls that need writing
> back to guest?
Yes, when a hypercall want to return data via XMM registers, it should
update hc->xmm[] and set hc->dirty (I plan on using this in a future
patch). The reason why I didn't differ this change to actual patch
needs it is that it pairs nicely with the read/write xmm_reg() calls in
kvm_hv_hypercall().
~ Sid.
Amazon Development Center Germany GmbH
Krausenstr. 38
10117 Berlin
Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss
Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B
Sitz: Berlin
Ust-ID: DE 289 237 879
next prev parent reply other threads:[~2021-04-13 9:10 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-12 17:00 [PATCH v2 0/4] Add support for XMM fast hypercalls Siddharth Chandrasekaran
2021-04-12 17:00 ` [PATCH v2 1/4] KVM: x86: Move FPU register accessors into fpu.h Siddharth Chandrasekaran
2021-04-13 13:40 ` Vitaly Kuznetsov
2021-04-13 13:46 ` Siddharth Chandrasekaran
2021-04-12 17:00 ` [PATCH v2 2/4] KVM: hyper-v: Collect hypercall params into struct Siddharth Chandrasekaran
2021-04-13 13:53 ` Vitaly Kuznetsov
2021-04-13 14:11 ` Siddharth Chandrasekaran
2021-04-12 17:00 ` [PATCH v2 3/4] KVM: x86: kvm_hv_flush_tlb use inputs from XMM registers Siddharth Chandrasekaran
2021-04-12 20:13 ` Wei Liu
2021-04-13 9:09 ` Siddharth Chandrasekaran [this message]
2021-04-13 14:09 ` Vitaly Kuznetsov
2021-04-13 21:07 ` Siddharth Chandrasekaran
2021-04-12 17:00 ` [PATCH v2 4/4] KVM: hyper-v: Advertise support for fast XMM hypercalls Siddharth Chandrasekaran
2021-04-12 20:14 ` Wei Liu
2021-04-13 9:11 ` Siddharth Chandrasekaran
2021-04-13 14:26 ` Vitaly Kuznetsov
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