[xen staging] arm/vgic-v3: Fix write_ignore_64's check in __vgic_v3_rdistr_rd_mmio_write()

[patchbot@xxxxxxx]

commit 1f75bd375d0757d6646ca2029a9559d535f6b511
Author:     Oleksandr Tyshchenko <Oleksandr_Tyshchenko@xxxxxxxx>
AuthorDate: Tue May 20 15:53:13 2025 +0000
Commit:     Stefano Stabellini <stefano.stabellini@xxxxxxx>
CommitDate: Tue May 20 18:59:01 2025 -0700

    arm/vgic-v3: Fix write_ignore_64's check in __vgic_v3_rdistr_rd_mmio_write()
    
    An attempt to write access the register (i.e. GICR_PROPBASER, 
GICR_PENDBASER)
    which should be ignored (i.e. no virtual ITS present) causes the guest data 
abort
    due to incorrect check at the write_ignore_64 label. The check should be
    inverted.
    
    While at it, move goto to the next line.
    
    Fixes: c4d6bbdc12e5 ("xen/arm: vgic-v3: Support 32-bit access for 64-bit 
registers")
    Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
    Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 xen/arch/arm/vgic-v3.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/vgic-v3.c b/xen/arch/arm/vgic-v3.c
index 2eaa48fadb..f20249f731 100644
--- a/xen/arch/arm/vgic-v3.c
+++ b/xen/arch/arm/vgic-v3.c
@@ -649,7 +649,8 @@ bad_width:
     return 0;
 
 write_ignore_64:
-    if ( vgic_reg64_check_access(dabt) ) goto bad_width;
+    if ( !vgic_reg64_check_access(dabt) )
+        goto bad_width;
     return 1;
 
 write_ignore_32:
--
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