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Re: [Qemu-devel] [PATCH] hw/arm/virt: Allow zero address for PCI IO spac
From: |
Laurent Vivier |
Subject: |
Re: [Qemu-devel] [PATCH] hw/arm/virt: Allow zero address for PCI IO space |
Date: |
Fri, 16 Oct 2015 11:59:35 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0 |
On 16/10/2015 11:32, Peter Maydell wrote:
> On 16 October 2015 at 09:52, Laurent Vivier <address@hidden> wrote:
>> I'm going to remove the zero address checking and try to start a qemu
>> for each of them to see which ones are broken.
>
> You need to also make sure there's a PCI card in there
> and that the guest maps it with a BAR at address zero
> (testing both MMIO BARs and IO BARs), and then exercise
> the guest sufficiently to check that behaviour of whatever
> it might be overlapping is still OK.
I think it will be hard to trigger this case. :(
For instance, on pseries, the card is put at address 0 only when it is
hotplugged, and on reboot it is moved to another address.
> You might find it easier to do by code inspection in
> some cases (boards which implement PCI as a simple
> "memory window into the PCI space" rather than with
> x86-style "anything in the background not covered by
> another device is PCI space" should be ok).
OK, I will...
Laurent
- Re: [Qemu-devel] [PATCH] hw/arm/virt: Allow zero address for PCI IO space, (continued)
- Re: [Qemu-devel] [PATCH] hw/arm/virt: Allow zero address for PCI IO space, Peter Maydell, 2015/10/15
- Re: [Qemu-devel] [PATCH] hw/arm/virt: Allow zero address for PCI IO space, Laurent Vivier, 2015/10/13
- Re: [Qemu-devel] [PATCH] hw/arm/virt: Allow zero address for PCI IO space, Michael S. Tsirkin, 2015/10/13
- Re: [Qemu-devel] [PATCH] hw/arm/virt: Allow zero address for PCI IO space, Peter Maydell, 2015/10/13
- Re: [Qemu-devel] [PATCH] hw/arm/virt: Allow zero address for PCI IO space, Michael S. Tsirkin, 2015/10/13
- Re: [Qemu-devel] [PATCH] hw/arm/virt: Allow zero address for PCI IO space, Peter Maydell, 2015/10/13
- Re: [Qemu-devel] [PATCH] hw/arm/virt: Allow zero address for PCI IO space, Peter Maydell, 2015/10/15
- Re: [Qemu-devel] [PATCH] hw/arm/virt: Allow zero address for PCI IO space, Laurent Vivier, 2015/10/16
- Re: [Qemu-devel] [PATCH] hw/arm/virt: Allow zero address for PCI IO space, Michael S. Tsirkin, 2015/10/16
- Re: [Qemu-devel] [PATCH] hw/arm/virt: Allow zero address for PCI IO space, Peter Maydell, 2015/10/16
- Re: [Qemu-devel] [PATCH] hw/arm/virt: Allow zero address for PCI IO space,
Laurent Vivier <=
- [Qemu-devel] [PATCH v2] hw/arm/virt: Allow zero address for PCI IO space, Alexander Gordeev, 2015/10/15
- Re: [Qemu-devel] [PATCH v2] hw/arm/virt: Allow zero address for PCI IO space, Peter Maydell, 2015/10/15