[Xen-devel] [PATCH v2 04/45] xen/arm: vgic: Override the group in lr everytime

[Andre Przywara <andre.przywara@xxxxxxxxxx>]

From: Julien Grall <julien.grall@xxxxxxx>

At the moment, write_lr is assuming the caller will set correctly the
group. However the group should always be 0 when the guest is using
vGICv2 and 1 for vGICv3. As the caller should not care about the group,
override it directly.

With that change, write_lr is now behaving like update_lr for the group.

Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
Reviewed-by: Andre Przywara <andre.przywara@xxxxxxx>
Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
---
Changes:
- Add Andre's reviewed-by

 xen/arch/arm/gic-v2.c     |  4 +---
 xen/arch/arm/gic-v3.c     | 11 ++++++++---
 xen/include/asm-arm/gic.h |  1 -
 3 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/xen/arch/arm/gic-v2.c b/xen/arch/arm/gic-v2.c
index f16e17c1a3..fc105c08b8 100644
--- a/xen/arch/arm/gic-v2.c
+++ b/xen/arch/arm/gic-v2.c
@@ -469,7 +469,6 @@ static void gicv2_read_lr(int lr, struct gic_lr *lr_reg)
     lr_reg->priority = (lrv >> GICH_V2_LR_PRIORITY_SHIFT) & 
GICH_V2_LR_PRIORITY_MASK;
     lr_reg->state     = (lrv >> GICH_V2_LR_STATE_SHIFT) & 
GICH_V2_LR_STATE_MASK;
     lr_reg->hw_status = (lrv >> GICH_V2_LR_HW_SHIFT) & GICH_V2_LR_HW_MASK;
-    lr_reg->grp       = (lrv >> GICH_V2_LR_GRP_SHIFT) & GICH_V2_LR_GRP_MASK;
 }
 
 static void gicv2_write_lr(int lr, const struct gic_lr *lr_reg)
@@ -483,8 +482,7 @@ static void gicv2_write_lr(int lr, const struct gic_lr 
*lr_reg)
           ((uint32_t)(lr_reg->state & GICH_V2_LR_STATE_MASK)
                                    << GICH_V2_LR_STATE_SHIFT) |
           ((uint32_t)(lr_reg->hw_status & GICH_V2_LR_HW_MASK)
-                                       << GICH_V2_LR_HW_SHIFT)  |
-          ((uint32_t)(lr_reg->grp & GICH_V2_LR_GRP_MASK) << 
GICH_V2_LR_GRP_SHIFT) );
+                                       << GICH_V2_LR_HW_SHIFT));
 
     writel_gich(lrv, GICH_LR + lr * 4);
 }
diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
index 09b49a07d5..0dfa1a1e08 100644
--- a/xen/arch/arm/gic-v3.c
+++ b/xen/arch/arm/gic-v3.c
@@ -1012,7 +1012,6 @@ static void gicv3_read_lr(int lr, struct gic_lr *lr_reg)
     lr_reg->priority  = (lrv >> ICH_LR_PRIORITY_SHIFT) & ICH_LR_PRIORITY_MASK;
     lr_reg->state     = (lrv >> ICH_LR_STATE_SHIFT) & ICH_LR_STATE_MASK;
     lr_reg->hw_status = (lrv >> ICH_LR_HW_SHIFT) & ICH_LR_HW_MASK;
-    lr_reg->grp       = (lrv >> ICH_LR_GRP_SHIFT) & ICH_LR_GRP_MASK;
 }
 
 static void gicv3_write_lr(int lr_reg, const struct gic_lr *lr)
@@ -1023,8 +1022,14 @@ static void gicv3_write_lr(int lr_reg, const struct 
gic_lr *lr)
         ((u64)(lr->virq & ICH_LR_VIRTUAL_MASK)  << ICH_LR_VIRTUAL_SHIFT) |
         ((u64)(lr->priority & ICH_LR_PRIORITY_MASK) << ICH_LR_PRIORITY_SHIFT)|
         ((u64)(lr->state & ICH_LR_STATE_MASK) << ICH_LR_STATE_SHIFT) |
-        ((u64)(lr->hw_status & ICH_LR_HW_MASK) << ICH_LR_HW_SHIFT)  |
-        ((u64)(lr->grp & ICH_LR_GRP_MASK) << ICH_LR_GRP_SHIFT) );
+        ((u64)(lr->hw_status & ICH_LR_HW_MASK) << ICH_LR_HW_SHIFT) );
+
+    /*
+     * When the guest is using vGICv3, all the IRQs are Group 1. Group 0
+     * would result in a FIQ, which will not be expected by the guest OS.
+     */
+    if ( current->domain->arch.vgic.version == GIC_V3 )
+        lrv |= ICH_LR_GRP1;
 
     gicv3_ich_write_lr(lr_reg, lrv);
 }
diff --git a/xen/include/asm-arm/gic.h b/xen/include/asm-arm/gic.h
index 49cb94f792..1eb08b856e 100644
--- a/xen/include/asm-arm/gic.h
+++ b/xen/include/asm-arm/gic.h
@@ -211,7 +211,6 @@ struct gic_lr {
    uint8_t priority;
    uint8_t state;
    uint8_t hw_status;
-   uint8_t grp;
 };
 
 enum gic_version {
-- 
2.14.1


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