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-id = 2155
-title = "LoadVM assert on ARM_FEATURE_M for Cortex M3"
-state = "closed"
-created_at = "2024-02-07T18:22:10.940Z"
-closed_at = "2024-02-16T10:58:42.355Z"
-labels = ["kind::Bug", "target: arm", "workflow::Patch available"]
-url = "https://gitlab.com/qemu-project/qemu/-/issues/2155"
-host-os = "Ubuntu 20.04"
-host-arch = "x86_64"
-qemu-version = "v8.0.0 through v8.2.0"
-guest-os = "-"
-guest-arch = "ARM Cortex M3"
-description = """This appears to be a similar issue to https://gitlab.com/qemu-project/qemu/-/issues/1775 and https://gitlab.com/qemu-project/qemu/-/issues/1658
-
-When running `loadvm`  qemu aborts with this error:
-
-"qemu/target/arm/helper.c:12383: arm_security_space_below_el3: Assertion `!arm_feature(env, ARM_FEATURE_M)' failed."
-
-I've traced the error to `pmu_counter_enabled` in `qemu\\target\\arm\\helper.c:1172`   
- [uint64_t mdcr_el2 = arm_mdcr_el2_eff(env)](https://gitlab.com/qemu-project/qemu/-/blob/v8.2.0/target/arm/helper.c?ref_type=tags#L1172)  (link is to 8.2.0 release tag)
-
-
-The issue is caused by attempting to get the MDCR_EL2 register  prior to checking if the CPU has ARM_FEATURE_PMU support. 
-
-A simple fix seems to be to check for `ARM_PMU_ENABLED` and returning early if it is not enabled."""
-reproduce = """1. Start emulation and connect monitor
-2. savevm <snapshot-name>
-3. Loadvm <snapshot-name>"""
-additional = """See screenshot for stack trace
-
-![armCortexM3LoadVMStackTrace](/uploads/fcfd927f4d373922715c8787dbb9cc26/armCortexM3LoadVMStackTrace.png)"""