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linux/arch/x86/pci
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Thomas Gleixner 7e0815b3e0 x86/pci/xen: Disable PCI/MSI[-X] masking for XEN_HVM guests 
When a XEN_HVM guest uses the XEN PIRQ/Eventchannel mechanism, then
PCI/MSI[-X] masking is solely controlled by the hypervisor, but contrary to
XEN_PV guests this does not disable PCI/MSI[-X] masking in the PCI/MSI
layer.

This can lead to a situation where the PCI/MSI layer masks an MSI[-X]
interrupt and the hypervisor grants the write despite the fact that it
already requested the interrupt. As a consequence interrupt delivery on the
affected device is not happening ever.

Set pci_msi_ignore_mask to prevent that like it's done for XEN_PV guests
already.

Fixes: 809f9267bb ("xen: map MSIs into pirqs")
Reported-by: Jeremi Piotrowski <jpiotrowski@linux.microsoft.com>
Reported-by: Dusty Mabe <dustymabe@redhat.com>
Reported-by: Salvatore Bonaccorso <carnil@debian.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Noah Meyerhans <noahm@debian.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/87tuaduxj5.ffs@tglx
2022-04-29 14:37:39 +02:00
..
acpi.c x86/PCI: Remove initialization of static variables to false 2022-01-11 11:05:35 -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 PCI: Rename pcibios_add_device() to pcibios_device_add() 2021-09-21 15:26:09 -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: Avoid magic number with ELCR register accesses 2021-08-10 23:31:43 +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: Return true/false (not 1/0) from bool functions 2021-05-27 18:51:17 -05:00
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 x86/PCI: sta2x11: switch from 'pci_' to 'dma_' API 2021-09-02 11:36:56 -05:00
xen.c x86/pci/xen: Disable PCI/MSI[-X] masking for XEN_HVM guests 2022-04-29 14:37:39 +02:00