This is a note to let you know that I've just added the patch titled
xen/pci: don't use PCI BIOS service for configuration space accesses
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
xen-pci-don-t-use-pci-bios-service-for-configuration-space-accesses.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 76a8df7b49168509df02461f83fab117a4a86e08 Mon Sep 17 00:00:00 2001
From: David Vrabel <[email protected]>
Date: Fri, 4 May 2012 14:29:46 +0100
Subject: xen/pci: don't use PCI BIOS service for configuration space accesses
From: David Vrabel <[email protected]>
commit 76a8df7b49168509df02461f83fab117a4a86e08 upstream.
The accessing PCI configuration space with the PCI BIOS32 service does
not work in PV guests.
On systems without MMCONFIG or where the BIOS hasn't marked the
MMCONFIG region as reserved in the e820 map, the BIOS service is
probed (even though direct access is preferred) and this hangs.
Acked-by: Jan Beulich <[email protected]>
Signed-off-by: David Vrabel <[email protected]>
[v1: Fixed compile error when CONFIG_PCI is not set]
Signed-off-by: Konrad Rzeszutek Wilk <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/x86/xen/enlighten.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -62,6 +62,7 @@
#include <asm/reboot.h>
#include <asm/stackprotector.h>
#include <asm/hypervisor.h>
+#include <asm/pci_x86.h>
#include "xen-ops.h"
#include "mmu.h"
@@ -1259,8 +1260,10 @@ asmlinkage void __init xen_start_kernel(
/* Make sure ACS will be enabled */
pci_request_acs();
}
-
-
+#ifdef CONFIG_PCI
+ /* PCI BIOS service won't work from a PV guest. */
+ pci_probe &= ~PCI_PROBE_BIOS;
+#endif
xen_raw_console_write("about to get started...\n");
xen_setup_runstate_info(0);
Patches currently in stable-queue which might be from [email protected]
are
queue-3.0/xen-pci-don-t-use-pci-bios-service-for-configuration-space-accesses.patch
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