[Qemu-devel] [PATCH 6/6] x86_iommu/amd: Enable Guest virtual APIC support

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

Now that amd-iommu support interrupt remapping, enable the GASup in IVRS
table and GASup in extended feature register to indicate that IOMMU
support guest virtual APIC mode.

Note that the GAMSup is set to zero to indicate that  Guest Virtual
APIC does not support advanced interrupt features (i.e virtualized
interrupts using the guest virtual APIC).

See Table 21 from IOMMU spec for interrupt virtualization controls

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

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>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
 hw/i386/acpi-build.c | 3 ++-
 hw/i386/amd_iommu.h  | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 5c2c638..1cbc8ba 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -2565,7 +2565,8 @@ build_amd_iommu(GArray *table_data, BIOSLinker *linker)
     build_append_int_noprefix(table_data,
                              (48UL << 30) | /* HATS   */
                              (48UL << 28) | /* GATS   */
-                             (1UL << 2),    /* GTSup  */
+                             (1UL << 2)   | /* GTSup  */
+                             (1UL << 6),    /* GASup  */
                              4);
     /*
      *   Type 1 device entry reporting all devices
diff --git a/hw/i386/amd_iommu.h b/hw/i386/amd_iommu.h
index 1dab974..5defaac 100644
--- a/hw/i386/amd_iommu.h
+++ b/hw/i386/amd_iommu.h
@@ -177,7 +177,7 @@
 /* extended feature support */
 #define AMDVI_EXT_FEATURES (AMDVI_FEATURE_PREFETCH | AMDVI_FEATURE_PPR | \
         AMDVI_FEATURE_IA | AMDVI_FEATURE_GT | AMDVI_FEATURE_HE | \
-        AMDVI_GATS_MODE | AMDVI_HATS_MODE)
+        AMDVI_GATS_MODE | AMDVI_HATS_MODE | AMDVI_FEATURE_GA)
 
 /* capabilities header */
 #define AMDVI_CAPAB_FEATURES (AMDVI_CAPAB_FLAT_EXT | \
-- 
2.7.4