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Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support |
Date: |
Wed, 26 Jul 2017 15:10:40 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 |
On 26/07/2017 15:08, Igor Mammedov wrote:
> On Tue, 25 Jul 2017 18:23:22 +0200
> Paolo Bonzini <address@hidden> wrote:
>
>> On 25/07/2017 18:14, Laszlo Ersek wrote:
>>> "No regressions became apparent in tests with a range of Windows
>>> (XP-10)"
>>>
>>> In theory, w2k falls within that range.
>>
>> Nope, Windows 2000 is like NT 5.0, XP is like NT 5.1. :(
>>
>> One possibility is to fix it in SeaBIOS instead: if you get a 2.0 FADT
>> and an XSDT and no RSDT, it can build an RSDT and a 1.0 FADT itself,
>> patching the RSDT to point to it.
>>
>> It's a hack, but it's the only place I see to make it "just work". And
>> it could be extended nicely in the future.
>>
>> All QEMU would have to do is to provide an XSDT _instead_ of an RSDT.
> I'd support it, however it would break migrated guests with old BIOS
> image in RAM on reboot.
Why? Shouldn't the old ACPI tables get migrated together with the old
BIOS? Or are they rebuilt after reset?
Paolo
> Legacy users have an option to build SeaBIOS without ACPI from QEMU
> support by turning off CONFIG_FW_ROMFILE_LOAD (or use old SeaBIOS)
> which leads to using legacy tables included in SeaBIOS.
> Then mgmt layer above libvirt which knows what guest OS it's
> going to run can pick legacy BIOS image for it.
>
> But the testing issue will still stay as normally it's not tested
> path.
>
> PS:
> For now we are going to revert PC machine to rev1 and leave q35 at rev3
> as Michael suggested to keep both w2k and macos happy.
>
>>
>> Paolo
>>
>>> In practice, it is impossible to
>>> test *all* Windows versions against ACPI generator changes, even if you
>>> try to be thorough (which Phil was). One might not even *know about*
>>> "all" Windows versions. So people using w2k and similar should
>>> co-maintain the ACPI stuff and report back with testing on the fly;
>>> otherwise regressions are impossible to avoid.
>>
>
- Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support, (continued)
- Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support, Laszlo Ersek, 2017/07/25
- Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support, Paolo Bonzini, 2017/07/25
- Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support, Paolo Bonzini, 2017/07/25
- Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support, Phil Dennis-Jordan, 2017/07/25
- Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support, Paolo Bonzini, 2017/07/26
- Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support, Laszlo Ersek, 2017/07/26
- Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support, Paolo Bonzini, 2017/07/26
- Re: [Qemu-devel] [SeaBIOS] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support, Kevin O'Connor, 2017/07/25
- Re: [Qemu-devel] [SeaBIOS] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support, Paolo Bonzini, 2017/07/26
- Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support, Igor Mammedov, 2017/07/26
- Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support,
Paolo Bonzini <=
- Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support, Igor Mammedov, 2017/07/26
- Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support, Paolo Bonzini, 2017/07/26
- Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support, Igor Mammedov, 2017/07/26
- Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support, Daniel P. Berrange, 2017/07/26
- Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support, Michael S. Tsirkin, 2017/07/26
- Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support, Michael S. Tsirkin, 2017/07/26
- Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support, Gerd Hoffmann, 2017/07/24
- Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support, John Snow, 2017/07/24
- Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support, Programmingkid, 2017/07/24
Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support, Daniel P. Berrange, 2017/07/21