From: Gerd Hoffmann <kraxel@redhat.com>
To: Avi Kivity <avi@redhat.com>
Cc: Anthony Liguori <anthony@codemonkey.ws>,
Huang Ying <ying.huang@intel.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Andi Kleen <andi@firstfloor.org>
Subject: Re: [PATCH] Add MCE support to KVM
Date: Mon, 20 Apr 2009 10:59:51 +0200 [thread overview]
Message-ID: <49EC3987.2040001@redhat.com> (raw)
In-Reply-To: <49EC3198.9070902@redhat.com>
On 04/20/09 10:26, Avi Kivity wrote:
> Gerd Hoffmann wrote:
>> The xen pv-on-hvm drivers use an msr to indicate "please place the
>> hypercall page here". Handling that in kernel isn't an option IMHO.
>
> The contents of the hypercall page are vendor specific. This can be
> handled from userspace (though ideally we'd abstract the cpu vendor
> away).
Well, xenner doesn't do vmcalls, so the page isn't vendor specific. It
looks different for 32bit / 64bit guests though. And it actually can be
multiple pages (with one msr write per page). So the interface for
in-kernel handling would be more complex than "here is a hypercall page
for you".
> The Hyper-V hypercall page is more problematic, as it's specified to
> be an overlay; the page doesn't have to exist in guest RAM.
In userspace it should be easy to handle though as qemu can just create
a new memory slot, right?
cheers,
Gerd
next prev parent reply other threads:[~2009-04-20 9:00 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-08 1:53 [PATCH] Add MCE support to KVM Huang Ying
2009-04-09 15:50 ` Avi Kivity
2009-04-10 3:00 ` Huang Ying
2009-04-11 12:04 ` Avi Kivity
2009-04-11 12:19 ` Andi Kleen
2009-04-11 12:25 ` Avi Kivity
2009-04-13 8:26 ` Andi Kleen
2009-04-13 2:41 ` Huang Ying
2009-04-13 13:02 ` Avi Kivity
2009-04-14 2:04 ` Huang Ying
2009-04-14 10:45 ` Avi Kivity
2009-04-15 7:24 ` Huang Ying
2009-04-18 22:17 ` Anthony Liguori
2009-04-19 8:33 ` Avi Kivity
2009-04-20 7:52 ` Gerd Hoffmann
2009-04-20 8:26 ` Avi Kivity
2009-04-20 8:59 ` Gerd Hoffmann [this message]
2009-04-20 9:05 ` Avi Kivity
2009-04-20 10:04 ` Andi Kleen
2009-04-20 11:02 ` Avi Kivity
2009-04-20 11:23 ` Gerd Hoffmann
2009-04-20 11:27 ` Avi Kivity
2009-04-20 12:20 ` Gerd Hoffmann
2009-04-20 12:43 ` Avi Kivity
2009-04-20 13:24 ` Gerd Hoffmann
2009-04-20 13:45 ` Avi Kivity
2009-04-21 9:14 ` Xenner design and kvm msr handling Gerd Hoffmann
2009-04-21 10:14 ` Avi Kivity
2009-04-21 11:41 ` Gerd Hoffmann
2009-04-21 12:27 ` Avi Kivity
2009-04-21 12:47 ` Gerd Hoffmann
2009-04-21 13:33 ` Avi Kivity
2009-04-21 16:00 ` Gerd Hoffmann
2009-04-21 16:15 ` Avi Kivity
2009-04-22 10:02 ` Gerd Hoffmann
2009-04-21 16:04 ` [PATCH] Add MCE support to KVM Anthony Liguori
2009-04-21 16:17 ` Avi Kivity
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