[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Xen-devel] [PATCH v3 02/10] xen/arm: Ignore write to GICD_ISACTIVERn registers (vgic-v2)



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, but only if the value
to be written is zero. This should be fine because reading these registers
is already handled as 'read as zero'.

Signed-off-by: Mirela Simonovic <mirela.simonovic@xxxxxxxxxx>

---
CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
CC: Julien Grall <julien.grall@xxxxxxx>
---
Changes in v2:
- Write should be ignored only if the value to be written is zero
 (in v1 the write was ignored regardless of the value)

Changes in v3:
- Print warning only if the value to be written is not zero
---
 xen/arch/arm/vgic-v2.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/xen/arch/arm/vgic-v2.c b/xen/arch/arm/vgic-v2.c
index 646d1f3d12..f6c11f1e41 100644
--- a/xen/arch/arm/vgic-v2.c
+++ b/xen/arch/arm/vgic-v2.c
@@ -485,6 +485,8 @@ static int vgic_v2_distr_mmio_write(struct vcpu *v, 
mmio_info_t *info,
 
     case VRANGE32(GICD_ISACTIVER, GICD_ISACTIVERN):
         if ( dabt.size != DABT_WORD ) goto bad_width;
+        if ( r == 0 )
+            goto write_ignore_32;
         printk(XENLOG_G_ERR
                "%pv: vGICD: unhandled word write %#"PRIregister" to 
ISACTIVER%d\n",
                v, r, gicd_reg - GICD_ISACTIVER);
-- 
2.13.0


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel

 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.