Recent Linux versions added support to read ID_AA64ISAR2_EL1. On M1,
those reads trap into QEMU which handles them as faults.
However, AArch64 ID registers should always read as RES0. Let's
handle them accordingly.
This fixes booting Linux 5.17 guests.
Cc: qemu-stable@nongnu.org
Reported-by: Ivan Babrou <ivan@cloudflare.com>
Signed-off-by: Alexander Graf <agraf@csgraf.de>
Message-id:
20220209124135.69183-2-agraf@csgraf.de
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
return true;
}
+static bool is_id_sysreg(uint32_t reg)
+{
+ return SYSREG_OP0(reg) == 3 &&
+ SYSREG_OP1(reg) == 0 &&
+ SYSREG_CRN(reg) == 0 &&
+ SYSREG_CRM(reg) >= 1 &&
+ SYSREG_CRM(reg) < 8;
+}
+
static int hvf_sysreg_read(CPUState *cpu, uint32_t reg, uint32_t rt)
{
ARMCPU *arm_cpu = ARM_CPU(cpu);
/* Dummy register */
break;
default:
+ if (is_id_sysreg(reg)) {
+ /* ID system registers read as RES0 */
+ val = 0;
+ break;
+ }
cpu_synchronize_state(cpu);
trace_hvf_unhandled_sysreg_read(env->pc, reg,
SYSREG_OP0(reg),