linux-kernel - Re: [kvm-devel] [PATCH] Refactor hypercall infrastructure (v2)

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Message-Id: <200712031700.24084.amit.shah@qumranet.com>
Date:	Mon, 3 Dec 2007 17:00:23 +0530
From:	Amit Shah <amit.shah@...ranet.com>
To:	kvm-devel@...ts.sourceforge.net
Cc:	Avi Kivity <avi@...ranet.com>,
	Anthony Liguori <aliguori@...ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [kvm-devel] [PATCH] Refactor hypercall infrastructure (v2)

* Avi Kivity wrote:
> Amit Shah wrote:
> > * Anthony Liguori wrote:
> >  
> >
> >> Amit Shah wrote:
> >>    
> >>
> >> What are you using to issue the hypercall?
> >>    
> >
> > +       r = kvm_hypercall1(KVM_PV_PCI_DEVICE, page_gfn);
> >
> > Setup is done by:
> >
> > +       if (!kvm_para_available()) {
> > +               printk(KERN_ERR "KVM paravirt support not available\n");
> > +               r = -ENODEV;
> > +               goto out_dereg;
> > +       }
> >  
>
> There was a bug where instructions with a modrm byte specifying a
> register would try to access memory.  In the memory was not mapped,  
> emulation would fail. vmcall is one such instruction.  This was fixed by
>
> commit f83562246921d6a8a7de8b76853a6835ace3699d
> Author: Aurelien Jarno <aurelien@...el32.net>
> Date:   Wed Oct 17 19:30:41 2007 +0200
>
>     KVM: x86 emulator: fix access registers for instructions with ModR/M
> byte and Mod = 3

Thanks, and thank you, Aurelien!
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