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q35: ioapic: add support for emulated IOAPIC IR

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This patch translates all IOAPIC interrupts into MSI ones. One pseudo
ioapic address space is added to transfer the MSI message. By default,
it will be system memory address space. When IR is enabled, it will be
IOMMU address space.

Currently, only emulated IOAPIC is supported.

Idea suggested by Jan Kiszka and Rita Sinha in the following patch:

https://lists.gnu.org/archive/html/qemu-devel/2016-03/msg01933.html

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Peter Xu 2016-07-14 13:56:23 +08:00 • committed by Michael S. Tsirkin
parent 09cd058a2c
commit cb135f59b8
6 changed files with 38 additions and 5 deletions
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1
include/hw/i386/apic-msidef.h
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@ -25,6 +25,7 @@
#define MSI_ADDR_REDIRECTION_SHIFT 3
#define MSI_ADDR_DEST_ID_SHIFT 12
#define MSI_ADDR_DEST_IDX_SHIFT 4
#define MSI_ADDR_DEST_ID_MASK 0x00ffff0
#endif /* HW_APIC_MSIDEF_H */