Re: [Xen-devel] [PATCH] xen/pt: use address_space_memory object for memory region hooks

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

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

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