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| author | Thomas Gleixner <[email protected]> | 2022-04-28 13:50:54 +0000 |
|---|---|---|
| committer | Thomas Gleixner <[email protected]> | 2022-04-29 12:37:39 +0000 |
| commit | 7e0815b3e09986d2fe651199363e135b9358132a (patch) | |
| tree | 24772d1751a2da2d535ab838cb6dcdf00e6e4e55 /drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | |
| parent | bug: Have __warn() prototype defined unconditionally (diff) | |
| download | kernel-7e0815b3e09986d2fe651199363e135b9358132a.tar.gz kernel-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 <[email protected]>
Reported-by: Dusty Mabe <[email protected]>
Reported-by: Salvatore Bonaccorso <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Tested-by: Noah Meyerhans <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/87tuaduxj5.ffs@tglx
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c')
0 files changed, 0 insertions, 0 deletions