From 2bc6b218717b9d08f466f88209251d54bc09b207 Mon Sep 17 00:00:00 2001 From: Fuad Tabba Date: Tue, 22 Sep 2026 19:14:30 +0100 Subject: arm64/boot: Disable trapping of PMZR_EL0 writes to EL2 __init_el2_fgt2() writes one mask to both HDFGRTR2_EL2 and HDFGWTR2_EL2. PMZR_EL0 is write-only, so its trap bit, nPMZR_EL0, exists only in HDFGWTR2_EL2 and is therefore never set: a PMZR_EL0 write from the host traps to EL2, where the nVHE hypervisor has no handler and BUG()s. The kernel never writes PMZR_EL0, but kernel.perf_user_access=1 has the PMU driver set PMUSERENR_EL0.UEN for a task with a user-read event, so a write from EL0 reaches the trap and takes the host down without a panic message. Accumulate the HDFGWTR2_EL2 bits separately, as __init_el2_fgt() already does for HDFGWTR_EL2, and set nPMZR_EL0 with the other FEAT_PMUv3p9 bits. Fixes: 858c7bfcb35e1 ("arm64/boot: Enable EL2 requirements for FEAT_PMUv3p9") Cc: stable@vger.kernel.org Signed-off-by: Fuad Tabba Reviewed-by: Anshuman Khandual Reviewed-by: Oliver Upton Signed-off-by: Will Deacon --- include/uapi/asm-generic/param.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 include/uapi/asm-generic/param.h (limited to 'include/uapi/asm-generic/param.h') diff --git a/include/uapi/asm-generic/param.h b/include/uapi/asm-generic/param.h new file mode 100644 index 000000000..3ed505dfe --- /dev/null +++ b/include/uapi/asm-generic/param.h @@ -0,0 +1,24 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +#ifndef _UAPI__ASM_GENERIC_PARAM_H +#define _UAPI__ASM_GENERIC_PARAM_H + +#ifndef __USER_HZ +#define __USER_HZ 100 +#endif + +#ifndef HZ +#define HZ __USER_HZ +#endif + +#ifndef EXEC_PAGESIZE +#define EXEC_PAGESIZE 4096 +#endif + +#ifndef NOGROUP +#define NOGROUP (-1) +#endif + +#define MAXHOSTNAMELEN 64 /* max length of hostname */ + + +#endif /* _UAPI__ASM_GENERIC_PARAM_H */ -- cgit v1.3.1