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xen/mcfg: Call PHYSDEVOP_pci_mmcfg_reserved for MCFG areas.

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The PCI MMCONFIG area is usually reserved via the E820 so the Xen hypervisor
is aware of these regions. But they can also be enumerated in the ACPI
DSDT which means the hypervisor won't know of them until the initial
domain informs it of via PHYSDEVOP_pci_mmcfg_reserved.

This is what this patch does for all of the MCFG regions that the
initial domain is aware of (E820 enumerated and ACPI).

Reported-by:  Santosh Jodh <Santosh.Jodh@citrix.com>
CC: Jan Beulich <JBeulich@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
CC: David Vrabel <david.vrabel@citrix.com>
CC: Mukesh Rathor <mukesh.rathor@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
[v1: Redid it a bit]
[v2: Dropped the P2M 1-1 setting]
[v3: Check for Xen in-case we are running under baremetal]
[v4: Wrap with CONFIG_PCI_MMCONFIG]
This commit is contained in:
Konrad Rzeszutek Wilk 2013-10-25 16:26:02 -04:00
parent af09d1a73a
commit 8deb3eb146
2 changed files with 58 additions and 0 deletions
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47
drivers/xen/pci.c
View file

@ -26,6 +26,7 @@
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>
#include "../pci/pci.h"
#include <asm/pci_x86.h>
static bool __read_mostly pci_seg_supported = true;
@ -192,3 +193,49 @@ static int __init register_xen_pci_notifier(void)
}
arch_initcall(register_xen_pci_notifier);
#ifdef CONFIG_PCI_MMCONFIG
static int __init xen_mcfg_late(void)
{
struct pci_mmcfg_region *cfg;
int rc;
if (!xen_initial_domain())
return 0;
if ((pci_probe & PCI_PROBE_MMCONF) == 0)
return 0;
if (list_empty(&pci_mmcfg_list))
return 0;
/* Check whether they are in the right area. */
list_for_each_entry(cfg, &pci_mmcfg_list, list) {
struct physdev_pci_mmcfg_reserved r;
r.address = cfg->address;
r.segment = cfg->segment;
r.start_bus = cfg->start_bus;
r.end_bus = cfg->end_bus;
r.flags = XEN_PCI_MMCFG_RESERVED;
rc = HYPERVISOR_physdev_op(PHYSDEVOP_pci_mmcfg_reserved, &r);
switch (rc) {
case 0:
case -ENOSYS:
continue;
default:
pr_warn("Failed to report MMCONFIG reservation"
" state for %s to hypervisor"
" (%d)\n",
cfg->name, rc);
}
}
return 0;
}
/*
* Needs to be done after acpi_init which are subsys_initcall.
*/
subsys_initcall_sync(xen_mcfg_late);
#endif

11
include/xen/interface/physdev.h
View file

@ -231,6 +231,17 @@ struct physdev_get_free_pirq {
#define XEN_PCI_DEV_VIRTFN 0x2
#define XEN_PCI_DEV_PXM 0x4
#define XEN_PCI_MMCFG_RESERVED 0x1
#define PHYSDEVOP_pci_mmcfg_reserved 24
struct physdev_pci_mmcfg_reserved {
uint64_t address;
uint16_t segment;
uint8_t start_bus;
uint8_t end_bus;
uint32_t flags;
};
#define PHYSDEVOP_pci_device_add 25
struct physdev_pci_device_add {
/* IN */