linux/arch/x86/pci
Thomas Gleixner 6c796996ee x86/pci/xen: Fixup fallout from the PCI/MSI overhaul
David reported that the recent PCI/MSI rework results in MSI descriptor
leakage under XEN.

This is caused by:

  1) The missing MSI_FLAG_FREE_MSI_DESCS flag in the XEN MSI domain info,
     which is required now that PCI/MSI delegates descriptor freeing to
     the core MSI code.

  2) Not disassociating the interrupts on teardown, by setting the
     msi_desc::irq to 0. This was not required before because the teardown
     was unconditional and did not check whether a MSI descriptor was still
     connected to a Linux interrupt.

On further inspection it came to light that the MSI_FLAG_DEV_SYSFS is
missing in the XEN MSI domain info as well to restore the pre 6.2 status
quo.

Add the missing MSI flags and disassociate the MSI descriptor from the
Linux interrupt in the XEN specific teardown function.

Fixes: b2bdda205c ("PCI/MSI: Let the MSI core free descriptors")
Fixes: 2f2940d168 ("genirq/msi: Remove filter from msi_free_descs_free_range()")
Fixes: ffd84485e6 ("PCI/MSI: Let the irq code handle sysfs groups")
Reported-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: David Woodhouse <dwmw@amazon.co.uk>
Link: https://lore.kernel.org/r/871qnunycr.ffs@tglx
2023-01-16 20:40:44 +01:00
..
acpi.c x86/PCI: Use pr_info() when possible 2022-12-10 10:33:18 -06:00
amd_bus.c x86/msr: Rename MSR_K8_SYSCFG to MSR_AMD64_SYSCFG 2021-05-10 07:51:38 +02:00
broadcom_bus.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
bus_numa.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
bus_numa.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ce4100.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 334 2019-06-05 17:37:06 +02:00
common.c x86/PCI: Add kernel cmdline options to use/ignore E820 reserved regions 2022-05-19 14:26:55 -05:00
direct.c x86/pci: Simplify code by using the new dmi_get_bios_year() helper 2018-02-23 08:20:30 +01:00
early.c PCI: Make early dump functionality generic 2018-06-29 20:06:07 -05:00
fixup.c PCI/sysfs: Find shadow ROM before static attribute initialization 2022-01-26 10:41:21 -06:00
i386.c x86/PCI: Make a kernel-doc comment a normal one 2020-11-27 13:43:09 +01:00
init.c x86/pci: Create PCI/MSI irqdomain after x86_init.pci.arch_init() 2021-02-10 22:06:47 +01:00
intel_mid_pci.c x86/PCI: Describe @reg for type1_access_ok() 2021-02-15 20:10:30 +01:00
irq.c x86/PCI: Fix coding style in PIRQ table verification 2022-04-10 12:48:15 +02:00
legacy.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
Makefile x86/PCI: Replace deprecated EXTRA_CFLAGS with ccflags-y 2019-11-21 07:49:27 -06:00
mmconfig_32.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 387 2019-06-05 17:37:11 +02:00
mmconfig_64.c remove ioremap_nocache and devm_ioremap_nocache 2020-01-06 09:45:59 +01:00
mmconfig-shared.c x86/pci: Treat EfiMemoryMappedIO as reservation of ECAM space 2023-01-13 11:53:54 -06:00
numachip.c x86/PCI: Add pci_numachip_init() declaration 2021-08-12 14:07:31 -05:00
olpc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
pcbios.c maccess: rename probe_kernel_address to get_kernel_nofault 2020-06-18 11:14:40 -07:00
sta2x11-fixup.c swiotlb: provide swiotlb_init variants that remap the buffer 2022-04-18 07:21:13 +02:00
xen.c x86/pci/xen: Fixup fallout from the PCI/MSI overhaul 2023-01-16 20:40:44 +01:00