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authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2013-11-06 16:16:56 -0500
committerBjorn Helgaas <bhelgaas@google.com>2013-11-06 16:32:19 -0700
commit0e4ccb1505a9e29c50170742ce26ac4655baab2d (patch)
tree59712adb4f49a554fb68178a2a6b1894ffbd1c42 /REPORTING-BUGS
parentf92d74c1f5afaff7cd1ea14ade8f1ba6b519e422 (diff)
PCI: Add x86_msi.msi_mask_irq() and msix_mask_irq()
Certain platforms do not allow writes in the MSI-X BARs to setup or tear down vector values. To combat against the generic code trying to write to that and either silently being ignored or crashing due to the pagetables being marked R/O this patch introduces a platform override. Note that we keep two separate, non-weak, functions default_mask_msi_irqs() and default_mask_msix_irqs() for the behavior of the arch_mask_msi_irqs() and arch_mask_msix_irqs(), as the default behavior is needed by x86 PCI code. For Xen, which does not allow the guest to write to MSI-X tables - as the hypervisor is solely responsible for setting the vector values - we implement two nops. This fixes a Xen guest crash when passing a PCI device with MSI-X to the guest. See the bugzilla for more details. [bhelgaas: add bugzilla info] Reference: https://bugzilla.kernel.org/show_bug.cgi?id=64581 Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: Sucheta Chakraborty <sucheta.chakraborty@qlogic.com> CC: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Diffstat (limited to 'REPORTING-BUGS')
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