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From: "Radim Krčmář" <rkrcmar@redhat.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	kvm@vger.kernel.org, x86@kernel.org,
	"K. Y. Srinivasan" <kys@microsoft.com>,
	Haiyang Zhang <haiyangz@microsoft.com>,
	Stephen Hemminger <sthemmin@microsoft.com>,
	"Michael Kelley (EOSG)" <Michael.H.Kelley@microsoft.com>,
	Mohammed Gamal <mmorsy@redhat.com>,
	Cathy Avery <cavery@redhat.com>, Bandan Das <bsd@redhat.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 7/7] x86/kvm: use Enlightened VMCS when running on Hyper-V
Date: Thu, 15 Mar 2018 20:43:47 +0100	[thread overview]
Message-ID: <20180315194347.GB5180@flask> (raw)
In-Reply-To: <alpine.DEB.2.21.1803152027370.1520@nanos.tec.linutronix.de>

2018-03-15 20:28+0100, Thomas Gleixner:
> On Thu, 15 Mar 2018, Radim Krčmář wrote:
> > 2018-03-15 16:19+0100, Vitaly Kuznetsov:
> > > This works. But hell, this is a crude hack :-) Not sure if there's a
> > > cleaner way to find what needs to be patched without something like jump
> > > label table ...
> > 
> > Yeah, I can see us accidently patching parts of other instructions. :)
> > 
> > The target instruction address can be made into a C-accessible symbol
> > with the same trick that vmx_return uses -- add a .global containing the
> > address of a label (not sure if a more direct approach would work).
> > 
> > The evil in me likes it.  (The good is too lazy to add a decent patching
> > infrastructure for just one user.)
> 
> Can we just use jump labels please? There is agreement that 4.17 will have
> a dependency on a jump label capable compiler for x86.

Luckily, it turned out that the path is very cold and should use the
simple test-and-jump.

      reply	other threads:[~2018-03-15 19:43 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-09 14:02 [PATCH v3 0/7] Enlightened VMCS support for KVM on Hyper-V Vitaly Kuznetsov
2018-03-09 14:02 ` [PATCH v3 1/7] x86/hyper-v: move hyperv.h out of uapi Vitaly Kuznetsov
2018-03-13 22:46   ` Michael Kelley (EOSG)
2018-03-14  9:35     ` Vitaly Kuznetsov
2018-03-14 16:13   ` Christoph Hellwig
2018-03-14 16:42     ` Joshua R. Poulson
2018-03-15  7:31       ` Christoph Hellwig
2018-03-09 14:02 ` [PATCH v3 2/7] x86/hyper-v: move definitions from TLFS to hyperv-tlfs.h Vitaly Kuznetsov
2018-03-13 22:51   ` Michael Kelley (EOSG)
2018-03-09 14:02 ` [PATCH v3 3/7] x86/kvm: rename HV_X64_MSR_APIC_ASSIST_PAGE to HV_X64_MSR_VP_ASSIST_PAGE Vitaly Kuznetsov
2018-03-09 14:02 ` [PATCH v3 4/7] x86/hyper-v: allocate and use Virtual Processor Assist Pages Vitaly Kuznetsov
2018-03-13 23:08   ` Michael Kelley (EOSG)
2018-03-14 15:15   ` Thomas Gleixner
2018-03-15 10:10     ` Vitaly Kuznetsov
2018-03-15 11:45       ` Thomas Gleixner
2018-03-15 13:48         ` Peter Zijlstra
2018-03-15 13:57           ` Thomas Gleixner
2018-03-09 14:02 ` [PATCH v3 5/7] x86/hyper-v: define struct hv_enlightened_vmcs and clean field bits Vitaly Kuznetsov
2018-03-13 23:09   ` Michael Kelley (EOSG)
2018-03-09 14:02 ` [PATCH v3 6/7] x86/hyper-v: detect nested features Vitaly Kuznetsov
2018-03-13 23:11   ` Michael Kelley (EOSG)
2018-03-09 14:02 ` [PATCH v3 7/7] x86/kvm: use Enlightened VMCS when running on Hyper-V Vitaly Kuznetsov
2018-03-09 14:08   ` Thomas Gleixner
2018-03-12 14:19     ` Vitaly Kuznetsov
2018-03-13 19:12       ` Radim Krčmář
2018-03-14 17:20         ` Vitaly Kuznetsov
2018-03-14 14:54       ` Paolo Bonzini
2018-03-14 15:19       ` Thomas Gleixner
2018-03-14 17:22         ` Vitaly Kuznetsov
2018-03-14 19:59           ` Thomas Gleixner
2018-03-14 20:06             ` Peter Zijlstra
2018-03-14 14:53   ` Paolo Bonzini
2018-03-15  9:56     ` Vitaly Kuznetsov
2018-03-15 11:01       ` Paolo Bonzini
2018-03-15 15:19     ` Vitaly Kuznetsov
2018-03-15 17:02       ` Radim Krčmář
2018-03-15 17:28         ` Radim Krčmář
2018-03-15 18:04           ` Vitaly Kuznetsov
2018-03-15 19:28         ` Thomas Gleixner
2018-03-15 19:43           ` Radim Krčmář [this message]

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