[Qemu-devel] [PATCH v2 0/8] x86_iommu/amd: add interrupt remap support

[Brijesh Singh <brijesh.singh@amd.com>]

This series adds the interrupt remapping support for amd-iommu device.

IOMMU spec is available at: https://support.amd.com/TechDocs/48882_IOMMU.pdf

To enable the interrupt remap use below qemu cli
# $QEMU \
  -device amd-iommu,intremap=on

I have tested FC-28 and Ubuntu 18.04 guest. 

Linux guest bootup log shows the interrupt remap supports:

[root@localhost ~]# dmesg | grep -i AMD-Vi
[    0.001761] AMD-Vi: Using IVHD type 0x10
[    0.003051] AMD-Vi: device: 00:03.0 cap: 0040 seg: 0 flags: d1 info 0000
[    0.004007] AMD-Vi:        mmio-addr: 00000000fed80000
[    0.004874] AMD-Vi:   DEV_ALL                        flags: 00
[    0.006236] AMD-Vi:   DEV_SPECIAL(IOAPIC[0])         devid: 00:14.0
[    0.667943] AMD-Vi: Found IOMMU at 0000:00:03.0 cap 0x40
[    0.668727] AMD-Vi: Extended features (0x29d3):
[    0.669874] AMD-Vi: Interrupt remapping enabled
[    0.671074] AMD-Vi: Lazy IO/TLB flushing enabled

cat /proc/interrupts confirms that its using IR

[root@localhost ~]# cat /proc/interrupts 
CPU0       
 0:         40  IR-IO-APIC    2-edge      timer
 1:          9  IR-IO-APIC    1-edge      i8042
 4:       1770  IR-IO-APIC    4-edge      ttyS0
 7:          0  IR-IO-APIC    7-edge      parport0
 8:          1  IR-IO-APIC    8-edge      rtc0
 9:          0  IR-IO-APIC    9-fasteoi   acpi
12:         15  IR-IO-APIC   12-edge      i8042
16:          0  IR-IO-APIC   16-fasteoi   i801_smbus
24:          0   PCI-MSI 49152-edge      AMD-Vi
25:      13070  IR-PCI-MSI 512000-edge      ahci[0000:00:1f.2]
26:         86  IR-PCI-MSI 32768-edge      enp0s2-rx-0
27:        139  IR-PCI-MSI 32769-edge      enp0s2-tx-0
28:          1  IR-PCI-MSI 32770-edge      enp0s2
NMI:          0   Non-maskable interrupts
LOC:      26686   Local timer interrupts
SPU:          0   Spurious interrupts
...
...

Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Cc: Tom Lendacky <Thomas.Lendacky@amd.com>
Cc: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>

Changes since v1:
 - move vtd_generate_msi_message to common code
 - fix the dest_mode bit extraction
 - add more comments explaining why we add the special device
 - some minor cleanups based on Peter's feedbacks

Brijesh Singh (8):
  x86_iommu: move the kernel-irqchip check in common code
  x86_iommu: move vtd_generate_msi_message in common file
  x86_iommu/amd: remove V=1 check from amdvi_validate_dte()
  x86_iommu/amd: Prepare for interrupt remap support
  x86_iommu/amd: Add interrupt remap support when VAPIC is not enabled
  i386: acpi: add IVHD device entry for IOAPIC
  x86_iommu/amd: Add interrupt remap support when VAPIC is enabled
  x86_iommu/amd: Enable Guest virtual APIC support

 hw/i386/acpi-build.c          |  32 +++-
 hw/i386/amd_iommu.c           | 402 +++++++++++++++++++++++++++++++++++++++++-
 hw/i386/amd_iommu.h           | 101 ++++++++++-
 hw/i386/intel_iommu.c         |  39 +---
 hw/i386/trace-events          |  14 ++
 hw/i386/x86-iommu.c           |  33 ++++
 include/hw/i386/intel_iommu.h |  59 -------
 include/hw/i386/x86-iommu.h   |  66 +++++++
 8 files changed, 638 insertions(+), 108 deletions(-)

-- 
2.7.4