Re: [Xen-devel] disable qemu PCI devices in HVM domains

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Steven Smith writes ("Re: [Xen-devel] disable qemu PCI devices in HVM domains"):
> I can't see any reason why the approach we take in our closed-source
> drivers wouldn't work here as well.  I've attached the appropriate
> patches from our product qemu patchqueue, tidied up and stripped of
> the most obviously XenServer-specific bits, and made to apply to
> current ioemu-remote.

I'm just in the process of applying this and I came across this:

@@ -792,6 +793,10 @@ static void raw_close(BlockDriverState *bs)
...
+#ifndef CONFIG_STUBDOM
+        /* Invalidate buffer cache for this device. */
+        ioctl(s->fd, BLKFLSBUF, 0);
+#endif

Does this mean that there is currently, in the Open Source qemu-dm
tree, a cache coherency problem between emulated and PV disk paths ?

What about Linux platforms with existing PV drivers which do not
engage in the blacklisting/disabling protocol ?

Ian.

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