From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
To: 佘旻 <chagg@foxmail.com>
Cc: qemu-devel <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] About PC_COMPAT
Date: Tue, 22 Mar 2016 12:06:11 +0000 [thread overview]
Message-ID: <20160322120611.GD2216@work-vm> (raw)
In-Reply-To: <tencent_480BE4B7577E28DE2089F87E@qq.com>
* 佘旻 (chagg@foxmail.com) wrote:
> I find PC_COMPAT_X_Y macros in file pc.h, and I don't understand why the smaller is the X_Y the more the devices defined? Can someone explain? Thanks!
It's because they're the difference from the current version - so the older
the version the more differences.
So PC_COMPAT_2_5 has no differences, PC_COMPAT_2_4 is 2_5's differences (none)
plus a handful of CPU differences. The PC_COMPAT_2_3 is PC_COMPAT_2_4's differences
plus a bunch of differences that went in between 2.3 and 2.4.
Dave
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
prev parent reply other threads:[~2016-03-22 12:06 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-22 6:43 [Qemu-devel] About PC_COMPAT =?gb18030?B?2dyVRg==?=
2016-03-22 12:06 ` Dr. David Alan Gilbert [this message]
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