From: "Michael S. Tsirkin" <mst@redhat.com>
To: Gerd Hoffmann <kraxel@redhat.com>
Cc: Gleb Natapov <gleb@redhat.com>,
Jamie Lokier <jamie@shareable.org>, Avi Kivity <avi@redhat.com>,
Anthony Liguori <aliguori@us.ibm.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
kvm-devel <kvm@vger.kernel.org>
Subject: Re: [Qemu-devel] Re: [PATCH 2/3] qemu: make cirrus init value pci spec compliant
Date: Mon, 12 Oct 2009 18:57:57 +0200 [thread overview]
Message-ID: <20091012165757.GA19380@redhat.com> (raw)
In-Reply-To: <4AD34EAB.5020501@redhat.com>
On Mon, Oct 12, 2009 at 05:43:39PM +0200, Gerd Hoffmann wrote:
> On 10/12/09 16:52, Gleb Natapov wrote:
>> On Mon, Oct 12, 2009 at 04:50:35PM +0200, Gerd Hoffmann wrote:
>>> pc.c does some magic here to map the complete bios into high memory
>>> and the legacy part at 0xe0000, thats why it is loaded in a
>>> different way. It gets loaded to IO_MEM_ROM memory though, so the
>>> guest should not be able to corrupt it.
>>>
>> But KVM doesn't support it (memory is always writable). And we want to reload
>> BIOS on reboot for migration purposes.
>
> Then it should be switched over to the new rom loader. Also the logic
> which does *not* reload stuff which goes to IO_MEM_ROM must be turned
> off for kvm them.
I think it needs to be turned off anyway. Since ROM is sent over for
migration, it might get out of sync with file even if it is read-only.
> cheers,
> Gerd
WARNING: multiple messages have this Message-ID (diff)
From: "Michael S. Tsirkin" <mst@redhat.com>
To: Gerd Hoffmann <kraxel@redhat.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>,
Gleb Natapov <gleb@redhat.com>, kvm-devel <kvm@vger.kernel.org>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
Avi Kivity <avi@redhat.com>
Subject: Re: [Qemu-devel] Re: [PATCH 2/3] qemu: make cirrus init value pci spec compliant
Date: Mon, 12 Oct 2009 18:57:57 +0200 [thread overview]
Message-ID: <20091012165757.GA19380@redhat.com> (raw)
In-Reply-To: <4AD34EAB.5020501@redhat.com>
On Mon, Oct 12, 2009 at 05:43:39PM +0200, Gerd Hoffmann wrote:
> On 10/12/09 16:52, Gleb Natapov wrote:
>> On Mon, Oct 12, 2009 at 04:50:35PM +0200, Gerd Hoffmann wrote:
>>> pc.c does some magic here to map the complete bios into high memory
>>> and the legacy part at 0xe0000, thats why it is loaded in a
>>> different way. It gets loaded to IO_MEM_ROM memory though, so the
>>> guest should not be able to corrupt it.
>>>
>> But KVM doesn't support it (memory is always writable). And we want to reload
>> BIOS on reboot for migration purposes.
>
> Then it should be switched over to the new rom loader. Also the logic
> which does *not* reload stuff which goes to IO_MEM_ROM must be turned
> off for kvm them.
I think it needs to be turned off anyway. Since ROM is sent over for
migration, it might get out of sync with file even if it is read-only.
> cheers,
> Gerd
next prev parent reply other threads:[~2009-10-12 17:01 UTC|newest]
Thread overview: 101+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1255013225.git.mst@redhat.com>
2009-10-08 14:52 ` [PATCH 1/3] pc-bios: enable io/memory unconditionally Michael S. Tsirkin
2009-10-08 14:52 ` [Qemu-devel] " Michael S. Tsirkin
2009-10-08 14:52 ` [PATCH 2/3] qemu: make cirrus init value pci spec compliant Michael S. Tsirkin
2009-10-08 14:52 ` [Qemu-devel] " Michael S. Tsirkin
2009-10-08 15:29 ` Avi Kivity
2009-10-08 15:29 ` [Qemu-devel] " Avi Kivity
2009-10-08 16:06 ` Michael S. Tsirkin
2009-10-08 16:06 ` [Qemu-devel] " Michael S. Tsirkin
2009-10-08 16:13 ` Avi Kivity
2009-10-08 16:13 ` [Qemu-devel] " Avi Kivity
2009-10-08 18:40 ` Jamie Lokier
2009-10-08 18:40 ` Jamie Lokier
2009-10-08 19:39 ` Michael S. Tsirkin
2009-10-08 19:39 ` Michael S. Tsirkin
2009-10-09 6:43 ` Michael S. Tsirkin
2009-10-09 6:43 ` Michael S. Tsirkin
2009-10-09 7:00 ` Gleb Natapov
2009-10-09 7:00 ` Gleb Natapov
2009-10-09 10:13 ` Michael S. Tsirkin
2009-10-09 10:13 ` [Qemu-devel] " Michael S. Tsirkin
2009-10-09 11:49 ` Gleb Natapov
2009-10-09 11:49 ` Gleb Natapov
2009-10-09 12:59 ` Michael S. Tsirkin
2009-10-09 12:59 ` Michael S. Tsirkin
2009-10-09 15:08 ` Gleb Natapov
2009-10-09 15:08 ` Gleb Natapov
2009-10-12 13:45 ` Gerd Hoffmann
2009-10-12 13:45 ` Gerd Hoffmann
2009-10-12 13:53 ` Gleb Natapov
2009-10-12 13:53 ` Gleb Natapov
2009-10-12 14:50 ` Gerd Hoffmann
2009-10-12 14:50 ` Gerd Hoffmann
2009-10-12 14:52 ` Gleb Natapov
2009-10-12 14:52 ` Gleb Natapov
2009-10-12 15:21 ` Jamie Lokier
2009-10-12 15:21 ` Jamie Lokier
2009-10-12 15:43 ` Gerd Hoffmann
2009-10-12 15:43 ` [Qemu-devel] " Gerd Hoffmann
2009-10-12 16:57 ` Michael S. Tsirkin [this message]
2009-10-12 16:57 ` Michael S. Tsirkin
2009-10-09 11:37 ` Jamie Lokier
2009-10-09 11:37 ` Jamie Lokier
2009-10-09 11:54 ` Gleb Natapov
2009-10-09 11:54 ` Gleb Natapov
2009-10-11 13:36 ` Michael S. Tsirkin
2009-10-11 13:36 ` Michael S. Tsirkin
2009-10-11 13:45 ` Gleb Natapov
2009-10-11 13:45 ` Gleb Natapov
2009-10-11 13:52 ` Michael S. Tsirkin
2009-10-11 13:52 ` [Qemu-devel] " Michael S. Tsirkin
2009-10-11 13:57 ` Gleb Natapov
2009-10-11 13:57 ` Gleb Natapov
2009-10-11 14:35 ` Michael S. Tsirkin
2009-10-11 14:35 ` Michael S. Tsirkin
2009-10-11 14:39 ` Gleb Natapov
2009-10-11 14:39 ` Gleb Natapov
2009-10-11 14:45 ` Michael S. Tsirkin
2009-10-11 14:45 ` Michael S. Tsirkin
2009-10-11 15:00 ` Gleb Natapov
2009-10-11 15:00 ` [Qemu-devel] " Gleb Natapov
2009-10-12 13:44 ` Anthony Liguori
2009-10-12 13:44 ` [Qemu-devel] " Anthony Liguori
2009-10-12 14:21 ` Gleb Natapov
2009-10-12 14:21 ` Gleb Natapov
2009-10-12 14:31 ` Anthony Liguori
2009-10-12 14:31 ` Anthony Liguori
2009-10-12 15:00 ` Kevin O'Connor
2009-10-12 15:00 ` Kevin O'Connor
2009-10-11 14:42 ` Avi Kivity
2009-10-11 14:42 ` Avi Kivity
2009-10-11 14:44 ` Michael S. Tsirkin
2009-10-11 14:44 ` Michael S. Tsirkin
2009-10-11 14:53 ` Avi Kivity
2009-10-11 14:53 ` Avi Kivity
2009-10-11 16:12 ` Michael S. Tsirkin
2009-10-11 16:12 ` Michael S. Tsirkin
2009-10-11 16:24 ` Avi Kivity
2009-10-11 16:24 ` Avi Kivity
2009-10-11 16:33 ` Michael S. Tsirkin
2009-10-11 16:33 ` Michael S. Tsirkin
2009-10-11 16:37 ` Avi Kivity
2009-10-11 16:37 ` Avi Kivity
2009-10-11 16:39 ` Michael S. Tsirkin
2009-10-11 16:39 ` [Qemu-devel] " Michael S. Tsirkin
2009-10-11 16:48 ` Avi Kivity
2009-10-11 16:48 ` [Qemu-devel] " Avi Kivity
2009-10-11 17:18 ` Michael S. Tsirkin
2009-10-11 17:18 ` Michael S. Tsirkin
2009-10-11 17:27 ` Avi Kivity
2009-10-11 17:27 ` Avi Kivity
2009-10-11 17:28 ` Avi Kivity
2009-10-11 17:28 ` Avi Kivity
2009-10-11 18:10 ` Michael S. Tsirkin
2009-10-11 18:10 ` Michael S. Tsirkin
2009-10-11 20:41 ` Avi Kivity
2009-10-11 20:41 ` Avi Kivity
2009-10-08 14:52 ` [PATCH 3/3] qemu: cleanup unused macros in cirrus Michael S. Tsirkin
2009-10-08 14:52 ` [Qemu-devel] " Michael S. Tsirkin
2009-10-08 15:24 ` Juan Quintela
2009-10-08 16:07 ` Michael S. Tsirkin
2009-10-08 16:07 ` [Qemu-devel] " Michael S. Tsirkin
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