[Xen-devel] [PATCH] xen/pvh: don't try to unplug emulated devices

[Juergen Gross <jgross@xxxxxxxx>]

A Xen PVH guest has no associated qemu device model, so trying to
unplug any emulated devices is making no sense at all.

Bail out early from xen_unplug_emulated_devices() when running as PVH
guest. This will avoid issuing the boot message:

[    0.000000] Xen Platform PCI: unrecognised magic value

Cc: <stable@xxxxxxxxxxxxxxx> # 4.11
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 arch/x86/xen/platform-pci-unplug.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/xen/platform-pci-unplug.c 
b/arch/x86/xen/platform-pci-unplug.c
index 66ab96a4e2b3..96d7f7d39cb9 100644
--- a/arch/x86/xen/platform-pci-unplug.c
+++ b/arch/x86/xen/platform-pci-unplug.c
@@ -134,6 +134,10 @@ void xen_unplug_emulated_devices(void)
 {
        int r;
 
+       /* PVH guests don't have emulated devices. */
+       if (xen_pvh_domain())
+               return;
+
        /* user explicitly requested no unplug */
        if (xen_emul_unplug & XEN_UNPLUG_NEVER)
                return;
-- 
2.16.4


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