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| author | Thomas Gleixner <tglx@linutronix.de> | 2022-04-28 15:50:54 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2022-04-29 14:37:39 +0200 |
| commit | 7e0815b3e09986d2fe651199363e135b9358132a (patch) | |
| tree | 24772d1751a2da2d535ab838cb6dcdf00e6e4e55 /tools | |
| parent | bug: Have __warn() prototype defined unconditionally (diff) | |
| download | linux-7e0815b3e09986d2fe651199363e135b9358132a.tar.xz linux-7e0815b3e09986d2fe651199363e135b9358132a.zip | |
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: 809f9267bbab ("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
Diffstat (limited to 'tools')
0 files changed, 0 insertions, 0 deletions