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Re: [Qemu-devel] [PATCH] xen/pt: use address_space_memory object for mem
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From: |
Anthony PERARD |
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Subject: |
Re: [Qemu-devel] [PATCH] xen/pt: use address_space_memory object for memory region hooks |
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Date: |
Tue, 17 Apr 2018 15:15:18 +0100 |
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User-agent: |
Mutt/1.9.4 (2018-02-28) |
On Fri, Apr 06, 2018 at 10:21:23PM +0100, Igor Druzhinin wrote:
> Commit 99605175c (xen-pt: Fix PCI devices re-attach failed) introduced
> a subtle bug. As soon as the guest switches off Bus Mastering on the
> device it immediately causes all the BARs be unmapped due to the DMA
> address space of the device being changed. This is undesired behavior
> because the guest may try to communicate with the device after that
> which triggers the following errors in the logs:
>
> [00:05.0] xen_pt_bar_read: Error: Should not read BAR through QEMU.
> @0x0000000000000200
> [00:05.0] xen_pt_bar_write: Error: Should not write BAR through QEMU.
> @0x0000000000000200
>
> The issue that the original patch tried to workaround (uneven number of
> region_add/del calls on device attach/detach) was fixed in later QEMU
> versions.
Do you know when the issue was fixed?
--
Anthony PERARD