[Xen-devel] [PATCH 2/7] xen/arm/vgic-v2: Ignore write to GICD_ISACTIVERn registers

[Mirela Simonovic <mirela.simonovic@xxxxxxxxxx>]

Guests attempt to write into these registers on resume (for example Linux).
Without this patch a data abort exception will be raised to the guest.
This patch handles the write access by ignoring it. This should be fine for
now because reading these registers is already handled as 'read as zero'.

Signed-off-by: Mirela Simonovic <mirela.simonovic@xxxxxxxxxx>
---
 xen/arch/arm/vgic-v2.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/xen/arch/arm/vgic-v2.c b/xen/arch/arm/vgic-v2.c
index 646d1f3d12..b088376ed0 100644
--- a/xen/arch/arm/vgic-v2.c
+++ b/xen/arch/arm/vgic-v2.c
@@ -484,11 +484,10 @@ static int vgic_v2_distr_mmio_write(struct vcpu *v, 
mmio_info_t *info,
         return 0;
 
     case VRANGE32(GICD_ISACTIVER, GICD_ISACTIVERN):
-        if ( dabt.size != DABT_WORD ) goto bad_width;
         printk(XENLOG_G_ERR
                "%pv: vGICD: unhandled word write %#"PRIregister" to 
ISACTIVER%d\n",
                v, r, gicd_reg - GICD_ISACTIVER);
-        return 0;
+        goto write_ignore_32;
 
     case VRANGE32(GICD_ICACTIVER, GICD_ICACTIVERN):
         printk(XENLOG_G_ERR
-- 
2.13.0


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