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Date: Wed, 25 Apr 2018 16:26:27 +0200
From: Greg KH <gregkh@linuxfoundation.org>
To: Youquan Song <youquan.song@intel.com>
Cc: stable@vger.kernel.org, tim.c.chen@linux.intel.com,
        ashok.raj@intel.com, dave.hansen@intel.com,
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        Radim =?utf-8?B?S3LEjW3DocWZ?= <rkrcmar@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>, kvm@vger.kernel.org
Subject: Re: [PATCH 22/24] KVM/x86: Remove indirect MSR op calls from
 SPEC_CTRL
Message-ID: <20180425142627.GG25610@kroah.com>
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 <1524021512-24022-23-git-send-email-youquan.song@intel.com>
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On Wed, Apr 18, 2018 at 11:18:30AM +0800, Youquan Song wrote:
> From: Paolo Bonzini <pbonzini@redhat.com>
> 
> commit ecb586bd29c99fb4de599dec388658e74388daad upstream.
> 
> Having a paravirt indirect call in the IBRS restore path is not a
> good idea, since we are trying to protect from speculative execution
> of bogus indirect branch targets.  It is also slower, so use
> native_wrmsrl() on the vmentry path too.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> Reviewed-by: Jim Mattson <jmattson@google.com>
> Cc: David Woodhouse <dwmw@amazon.co.uk>
> Cc: KarimAllah Ahmed <karahmed@amazon.de>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Radim Krčmář <rkrcmar@redhat.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: kvm@vger.kernel.org
> Cc: stable@vger.kernel.org
> Fixes: d28b387fb74da95d69d2615732f50cceb38e9a4d
> Link: http://lkml.kernel.org/r/20180222154318.20361-2-pbonzini@redhat.com
> Signed-off-by: Ingo Molnar <mingo@kernel.org>
> Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com> [v4.4 backport]
> 
> Conflicts:
> 	arch/x86/kvm/svm.c

Ugh :(