This patch is ported to xen from linux commit:
e7f1d1eef482150a64a6e6ad8faf40f8f97eed67
KVM: arm64: Log an error if trapping a read-from-write-only GICv3 access
A read-from-write-only GICv3 access should UNDEF at EL1. But since
we're in complete paranoia-land with broken CPUs, let's assume the
worse and gracefully handle the case.
Signed-off-by: Manish Jaggi <manish.ja...@cavium.com>
---
xen/arch/arm/arm64/vgic-v3-sr.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/xen/arch/arm/arm64/vgic-v3-sr.c b/xen/arch/arm/arm64/vgic-v3-sr.c
index 14276a4c92..d5dc8168c8 100644
--- a/xen/arch/arm/arm64/vgic-v3-sr.c
+++ b/xen/arch/arm/arm64/vgic-v3-sr.c
@@ -614,7 +614,11 @@ static void vgic_v3_write_eoir(struct cpu_user_regs *regs,
static void vreg_emulate_eoi(struct cpu_user_regs *regs, const union hsr hsr)
{
- vgic_v3_write_eoir(regs, hsr);
+
+ if ( unlikely(hsr.sysreg.read) )
+ inject_undef_exception(regs, hsr);
+ else
+ vgic_v3_write_eoir(regs, hsr);
}
static void vgic_v3_read_apxrn(struct cpu_user_regs *regs,
--
2.14.1
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