[PATCH v21 1/2] arm/vpci: mask off upper bits in vPCI read mmio handler

[Stewart Hildebrand]

On Arm, we expect read handlers to have the bits above the access size
zeroed. vPCI read handlers may return all 1s. Mask off the bits above
the access size.

Fixes: 9a5e22b64266 ("xen/arm: check read handler behavior")
Signed-off-by: Stewart Hildebrand <stewart.hildebr...@amd.com>
---
 xen/arch/arm/vpci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/arm/vpci.c b/xen/arch/arm/vpci.c
index b63a356bb4a8..3a3ff5d0812c 100644
--- a/xen/arch/arm/vpci.c
+++ b/xen/arch/arm/vpci.c
@@ -37,7 +37,7 @@ static int vpci_mmio_read(struct vcpu *v, mmio_info_t *info,
     if ( vpci_ecam_read(sbdf, ECAM_REG_OFFSET(info->gpa),
                         1U << info->dabt.size, &data) )
     {
-        *r = data;
+        *r = data & invalid;
         return 1;
     }
 
-- 
2.49.0