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authorEric Auger <eric.auger@redhat.com>2017-01-19 23:57:59 +0300
committerWill Deacon <will.deacon@arm.com>2017-01-23 18:00:45 +0300
commitc7b41f0af38f53e46050b56a5b0e96710097b83c (patch)
tree11687bd608512ebc4e4dbfdf4056dddfaf6af902 /include/linux/irqdomain.h
parent88156f00904183d99e19269fbdb5cb56dc1522c3 (diff)
downloadlinux-c7b41f0af38f53e46050b56a5b0e96710097b83c.tar.xz
irqdomain: irq_domain_check_msi_remap
This new function checks whether all MSI irq domains implement IRQ remapping. This is useful to understand whether VFIO passthrough is safe with respect to interrupts. On ARM typically an MSI controller can sit downstream to the IOMMU without preventing VFIO passthrough. As such any assigned device can write into the MSI doorbell. In case the MSI controller implements IRQ remapping, assigned devices will not be able to trigger interrupts towards the host. On the contrary, the assignment must be emphasized as unsafe with respect to interrupts. Signed-off-by: Eric Auger <eric.auger@redhat.com> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Tomasz Nowicki <tomasz.nowicki@caviumnetworks.com> Tested-by: Tomasz Nowicki <tomasz.nowicki@caviumnetworks.com> Tested-by: Bharat Bhushan <bharat.bhushan@nxp.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'include/linux/irqdomain.h')
-rw-r--r--include/linux/irqdomain.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index bc2f5719dace..188eced6813e 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -222,6 +222,7 @@ struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
void *host_data);
extern struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
enum irq_domain_bus_token bus_token);
+extern bool irq_domain_check_msi_remap(void);
extern void irq_set_default_host(struct irq_domain *host);
extern int irq_domain_alloc_descs(int virq, unsigned int nr_irqs,
irq_hw_number_t hwirq, int node,