From: Paolo Bonzini <pbonzini@redhat.com>
To: George Dunlap <george.dunlap@eu.citrix.com>
Cc: Yongjie Ren <yongjie.ren@intel.com>,
"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
Keir Fraser <keir@xen.org>,
Ian Campbell <Ian.Campbell@citrix.com>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Xudong Hao <xudong.hao@intel.com>,
hanweidong@huawei.com, Tim Deegan <tim@xen.org>,
qemu-devel@nongnu.org, yanqiangjun@huawei.com,
wangzhenguo@huawei.com, xiaowei.yang@huawei.com,
arei.gonglei@huawei.com, Jan Beulich <JBeulich@suse.com>,
luonengjun@huawei.com, YongweiX Xu <yongweix.xu@intel.com>,
SongtaoX Liu <songtaox.liu@intel.com>
Subject: Re: [Qemu-devel] [Xen-devel] [BUG 1747]Guest could't find bootable device with memory more than 3600M
Date: Thu, 13 Jun 2013 10:54:46 -0400 [thread overview]
Message-ID: <51B9DD36.6080000@redhat.com> (raw)
In-Reply-To: <51B9CF26.1080707@eu.citrix.com>
Il 13/06/2013 09:54, George Dunlap ha scritto:
>
> Also, as I understand it, at the moment:
> 1. Some operating systems (32-bit XP) won't be able to use relocated
> devices
> 2. Some devices (without 64-bit BARs) can't be relocated
Are there really devices with huge 32-bit BARs? I think #1 is the only
real problem, so far though it never was for KVM.
SeaBIOS sorts the BARs from smallest to largest alignment, and then from
smallest to largest size. Typically only the GPU will be relocated.
Paolo
> 3. qemu-traditional is fine with a resized <4GiB MMIO hole.
>
> So if we have #1 or #2, at the moment an option for a work-around is to
> use qemu-traditional.
>
> However, if we add your "print an error if the device doesn't fit", then
> this option will go away -- this will be a regression in functionality
> from 4.2.
>
> I thought that what we had proposed was to have an option in xenstore,
> that libxl would set, which would instruct hvmloader whether to expand
> the MMIO hole and whether to relocate devices above 64-bit?
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: George Dunlap <george.dunlap@eu.citrix.com>
Cc: Yongjie Ren <yongjie.ren@intel.com>,
"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
Keir Fraser <keir@xen.org>,
Ian Campbell <Ian.Campbell@citrix.com>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Xudong Hao <xudong.hao@intel.com>,
hanweidong@huawei.com, Tim Deegan <tim@xen.org>,
qemu-devel@nongnu.org, yanqiangjun@huawei.com,
wangzhenguo@huawei.com, xiaowei.yang@huawei.com,
arei.gonglei@huawei.com, Jan Beulich <JBeulich@suse.com>,
luonengjun@huawei.com, YongweiX Xu <yongweix.xu@intel.com>,
SongtaoX Liu <songtaox.liu@intel.com>
Subject: Re: [BUG 1747]Guest could't find bootable device with memory more than 3600M
Date: Thu, 13 Jun 2013 10:54:46 -0400 [thread overview]
Message-ID: <51B9DD36.6080000@redhat.com> (raw)
In-Reply-To: <51B9CF26.1080707@eu.citrix.com>
Il 13/06/2013 09:54, George Dunlap ha scritto:
>
> Also, as I understand it, at the moment:
> 1. Some operating systems (32-bit XP) won't be able to use relocated
> devices
> 2. Some devices (without 64-bit BARs) can't be relocated
Are there really devices with huge 32-bit BARs? I think #1 is the only
real problem, so far though it never was for KVM.
SeaBIOS sorts the BARs from smallest to largest alignment, and then from
smallest to largest size. Typically only the GPU will be relocated.
Paolo
> 3. qemu-traditional is fine with a resized <4GiB MMIO hole.
>
> So if we have #1 or #2, at the moment an option for a work-around is to
> use qemu-traditional.
>
> However, if we add your "print an error if the device doesn't fit", then
> this option will go away -- this will be a regression in functionality
> from 4.2.
>
> I thought that what we had proposed was to have an option in xenstore,
> that libxl would set, which would instruct hvmloader whether to expand
> the MMIO hole and whether to relocate devices above 64-bit?
next prev parent reply other threads:[~2013-06-13 14:54 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-07 9:20 [BUG 1747]Guest could't find bootable device with memory more than 3600M Xu, YongweiX
2013-06-07 12:15 ` Stefano Stabellini
2013-06-07 15:42 ` George Dunlap
2013-06-07 15:56 ` Stefano Stabellini
2013-06-08 7:27 ` Hao, Xudong
2013-06-10 11:49 ` George Dunlap
2013-06-11 17:26 ` [Qemu-devel] [Xen-devel] " Stefano Stabellini
2013-06-11 17:26 ` Stefano Stabellini
2013-06-12 7:25 ` [Qemu-devel] " Jan Beulich
2013-06-12 7:25 ` Jan Beulich
2013-06-12 8:31 ` [Qemu-devel] " Ian Campbell
2013-06-12 8:31 ` Ian Campbell
2013-06-12 9:02 ` [Qemu-devel] " Jan Beulich
2013-06-12 9:02 ` Jan Beulich
2013-06-12 9:22 ` [Qemu-devel] " Ian Campbell
2013-06-12 9:22 ` Ian Campbell
2013-06-12 10:07 ` [Qemu-devel] [Xen-devel] " Jan Beulich
2013-06-12 10:07 ` Jan Beulich
2013-06-12 11:23 ` [Qemu-devel] " Ian Campbell
2013-06-12 11:23 ` Ian Campbell
2013-06-12 11:56 ` [Qemu-devel] " Jan Beulich
2013-06-12 11:56 ` Jan Beulich
2013-06-12 11:59 ` [Qemu-devel] " Ian Campbell
2013-06-12 11:59 ` Ian Campbell
2013-06-12 10:05 ` [Qemu-devel] " George Dunlap
2013-06-12 10:05 ` George Dunlap
2013-06-12 10:11 ` [Qemu-devel] " Jan Beulich
2013-06-12 10:11 ` Jan Beulich
2013-06-12 10:15 ` [Qemu-devel] " George Dunlap
2013-06-12 10:15 ` George Dunlap
2013-06-12 13:23 ` [Qemu-devel] " Paolo Bonzini
2013-06-12 13:23 ` Paolo Bonzini
2013-06-12 13:49 ` [Qemu-devel] " Jan Beulich
2013-06-12 13:49 ` Jan Beulich
2013-06-12 14:02 ` [Qemu-devel] " Paolo Bonzini
2013-06-12 14:02 ` Paolo Bonzini
2013-06-12 14:19 ` [Qemu-devel] " Jan Beulich
2013-06-12 14:19 ` Jan Beulich
2013-06-12 15:25 ` [Qemu-devel] " George Dunlap
2013-06-12 15:25 ` George Dunlap
2013-06-12 20:13 ` [Qemu-devel] " Paolo Bonzini
2013-06-12 20:13 ` Paolo Bonzini
2013-06-13 13:44 ` [Qemu-devel] " Stefano Stabellini
2013-06-13 13:44 ` Stefano Stabellini
2013-06-13 13:54 ` [Qemu-devel] " George Dunlap
2013-06-13 13:54 ` George Dunlap
2013-06-13 14:50 ` [Qemu-devel] " Stefano Stabellini
2013-06-13 14:50 ` Stefano Stabellini
2013-06-13 15:06 ` [Qemu-devel] [Xen-devel] " Jan Beulich
2013-06-13 15:06 ` Jan Beulich
2013-06-13 15:29 ` [Qemu-devel] [Xen-devel] " George Dunlap
2013-06-13 15:29 ` George Dunlap
2013-06-13 16:13 ` [Qemu-devel] " Stefano Stabellini
2013-06-13 16:13 ` Stefano Stabellini
2013-06-13 15:34 ` [Qemu-devel] " Ian Campbell
2013-06-13 15:34 ` Ian Campbell
2013-06-13 16:55 ` [Qemu-devel] " Stefano Stabellini
2013-06-13 16:55 ` Stefano Stabellini
2013-06-13 17:22 ` [Qemu-devel] " Ian Campbell
2013-06-13 17:22 ` Ian Campbell
2013-06-14 10:53 ` [Qemu-devel] " George Dunlap
2013-06-14 10:53 ` George Dunlap
2013-06-14 11:34 ` [Qemu-devel] [Xen-devel] " Ian Campbell
2013-06-14 11:34 ` Ian Campbell
2013-06-14 14:14 ` [Qemu-devel] " George Dunlap
2013-06-14 14:14 ` George Dunlap
2013-06-14 14:36 ` [Qemu-devel] " George Dunlap
2013-06-14 14:36 ` George Dunlap
2013-06-13 14:54 ` Paolo Bonzini [this message]
2013-06-13 14:54 ` Paolo Bonzini
2013-06-13 15:16 ` [Qemu-devel] [Xen-devel] " Ian Campbell
2013-06-13 15:16 ` Ian Campbell
2013-06-13 15:30 ` [Qemu-devel] [Xen-devel] " George Dunlap
2013-06-13 15:30 ` George Dunlap
2013-06-13 15:36 ` [Qemu-devel] " Ian Campbell
2013-06-13 15:36 ` Ian Campbell
2013-06-13 15:40 ` [Qemu-devel] " George Dunlap
2013-06-13 15:40 ` George Dunlap
2013-06-13 15:42 ` [Qemu-devel] " Ian Campbell
2013-06-13 15:42 ` Ian Campbell
2013-06-13 15:40 ` [Qemu-devel] " Stefano Stabellini
2013-06-13 15:40 ` Stefano Stabellini
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