xen/pci: don't use PCI BIOS service for configuration space accesses
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. CC: stable@kernel.org 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>
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@ -63,6 +63,7 @@
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#include <asm/stackprotector.h>
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#include <asm/hypervisor.h>
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#include <asm/mwait.h>
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#include <asm/pci_x86.h>
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#ifdef CONFIG_ACPI
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#include <linux/acpi.h>
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@ -1398,8 +1399,10 @@ asmlinkage void __init xen_start_kernel(void)
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/* Make sure ACS will be enabled */
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pci_request_acs();
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}
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#ifdef CONFIG_PCI
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/* PCI BIOS service won't work from a PV guest. */
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pci_probe &= ~PCI_PROBE_BIOS;
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#endif
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xen_raw_console_write("about to get started...\n");
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xen_setup_runstate_info(0);
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