[PULL,06/28] hw/intc/arm_gicv3_cpuif: Add cast to match the documentation

Commit Message

Peter Maydell Oct. 15, 2024, 10:37 a.m. UTC

From: Alexandra Diupina <[e-mail]>

The result of 1 << regbit with regbit==31 has a 1 in the 32nd bit.
When cast to uint64_t (for further bitwise OR), the 32 most
significant bits will be filled with 1s. However, the documentation
states that the upper 32 bits of ICH_AP[0/1]R<n>_EL2 are reserved.

Add an explicit cast to match the documentation.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Cc: [e-mail]
Fixes: c3f21b065a ("hw/intc/arm_gicv3_cpuif: Support vLPIs")
Signed-off-by: Alexandra Diupina <[e-mail]>
Reviewed-by: Peter Maydell <[e-mail]>
Signed-off-by: Peter Maydell <[e-mail]>
---
 hw/intc/arm_gicv3_cpuif.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch

diff --git a/hw/intc/arm_gicv3_cpuif.c b/hw/intc/arm_gicv3_cpuif.c
index 89359db7004..ea1d1b34551 100644
--- a/hw/intc/arm_gicv3_cpuif.c
+++ b/hw/intc/arm_gicv3_cpuif.c
@@ -793,7 +793,7 @@  static void icv_activate_vlpi(GICv3CPUState *cs)
     int regno = aprbit / 32;
     int regbit = aprbit % 32;
 
-    cs->ich_apr[cs->hppvlpi.grp][regno] |= (1 << regbit);
+    cs->ich_apr[cs->hppvlpi.grp][regno] |= (1U << regbit);
     gicv3_redist_vlpi_pending(cs, cs->hppvlpi.irq, 0);
 }