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Re: [libvirt] [PATCH] qemu: Reject SDL graphic if it's not supported by qemu

于 2011年01月11日 23:33, Eric Blake 写道:
On 01/11/2011 04:29 AM, Daniel P. Berrange wrote:
On Tue, Jan 11, 2011 at 03:43:07PM +0800, Osier Yang wrote:
If the emulator doesn't support SDL graphic, we should reject
the use of SDL graphic xml with error messages, but not ignore
it silently.

* src/qemu/qemu_command.c


Most previous versions of QEMU don't have any explicit -sdl
flag. You got SDL automagically when *no* -vnc flag was
given. So this change breaks many old QEMU versions.

We should know (or be able to find out) the precise version of qemu
where sdl was added as an explicit device.  Once we do that, it's easy
enough to modify libvirt's qemu/qemu_capabilities.h to add yet another
flag bit, and qemu_capabilities.c to set that flag bit to true for old
versions where SDL is automatic, and to new versions where SDL is
explicitly available, while leaving it false on new versions (such as
the RHEL build) where SDL is disabled.

I agree that it doesn't scale well for other features with similar
treatments, but the entire qemu_capabilities.c file is an example of the
effect of poor scalability of upstream qemu.

[root Osier qemu]# git log 7d957bd8cbcbf56f7916d375e65042d767f544b5
commit 7d957bd8cbcbf56f7916d375e65042d767f544b5
Author: aliguori <aliguori c046a42c-6fe2-441c-8c8c-71466251a162>
Date:   Thu Jan 15 22:14:11 2009 +0000

    DisplayState interface change (Stefano Stabellini)

[root Osier qemu]# git log VERSION
commit b4171e4b79d5be97ee0d1516aab321f32a3aca1a
Author: aliguori <aliguori c046a42c-6fe2-441c-8c8c-71466251a162>
Date:   Wed Mar 4 22:47:59 2009 +0000

    Add version information for 0.10.0 release.

    Signed-off-by: Anthony Liguori <aliguori us ibm com>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk 6685 c046a42c-6fe2-441c-8c8c-71466251a162

diff --git a/VERSION b/VERSION
index f514a2f..78bc1ab 100644
@@ -1 +1 @@
\ No newline at end of file

commit bfe312121eb80226f0cb2d4b7c2b9b5fafecd93e
Author: bellard <bellard c046a42c-6fe2-441c-8c8c-71466251a162>
Date:   Sun Jan 6 17:10:54 2008 +0000

    version change

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk 3892 c046a42c-6fe2-441c-8c8c-71466251a162

so, it should be from 0.10.0


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