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authorDavid Vrabel <david.vrabel@citrix.com>2012-05-04 14:29:46 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-05-12 09:32:04 -0700
commit381c2fc9d4012983065c39f0fc50cac9ec32b0be (patch)
parent3d018683171461ac7effa05fdecf296f4ab442a5 (diff)
xen/pci: don't use PCI BIOS service for configuration space accesses
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 <jbeulich@suse.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com> [v1: Fixed compile error when CONFIG_PCI is not set] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 4172af8ceeb3..4e517d4b183a 100644
--- 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"
@@ -1274,8 +1275,10 @@ asmlinkage void __init xen_start_kernel(void)
/* Make sure ACS will be enabled */
+#ifdef CONFIG_PCI
+ /* PCI BIOS service won't work from a PV guest. */
+ pci_probe &= ~PCI_PROBE_BIOS;
xen_raw_console_write("about to get started...\n");