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/resource.h | 62 +++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 include/uapi/asm-generic/resource.h (limited to 'include/uapi/asm-generic/resource.h') diff --git a/include/uapi/asm-generic/resource.h b/include/uapi/asm-generic/resource.h new file mode 100644 index 000000000..f12db7a0d --- /dev/null +++ b/include/uapi/asm-generic/resource.h @@ -0,0 +1,62 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +#ifndef _UAPI_ASM_GENERIC_RESOURCE_H +#define _UAPI_ASM_GENERIC_RESOURCE_H + +/* + * Resource limit IDs + * + * ( Compatibility detail: there are architectures that have + * a different rlimit ID order in the 5-9 range and want + * to keep that order for binary compatibility. The reasons + * are historic and all new rlimits are identical across all + * arches. If an arch has such special order for some rlimits + * then it defines them prior including asm-generic/resource.h. ) + */ + +#define RLIMIT_CPU 0 /* CPU time in sec */ +#define RLIMIT_FSIZE 1 /* Maximum filesize */ +#define RLIMIT_DATA 2 /* max data size */ +#define RLIMIT_STACK 3 /* max stack size */ +#define RLIMIT_CORE 4 /* max core file size */ + +#ifndef RLIMIT_RSS +# define RLIMIT_RSS 5 /* max resident set size */ +#endif + +#ifndef RLIMIT_NPROC +# define RLIMIT_NPROC 6 /* max number of processes */ +#endif + +#ifndef RLIMIT_NOFILE +# define RLIMIT_NOFILE 7 /* max number of open files */ +#endif + +#ifndef RLIMIT_MEMLOCK +# define RLIMIT_MEMLOCK 8 /* max locked-in-memory address space */ +#endif + +#ifndef RLIMIT_AS +# define RLIMIT_AS 9 /* address space limit */ +#endif + +#define RLIMIT_LOCKS 10 /* maximum file locks held */ +#define RLIMIT_SIGPENDING 11 /* max number of pending signals */ +#define RLIMIT_MSGQUEUE 12 /* maximum bytes in POSIX mqueues */ +#define RLIMIT_NICE 13 /* max nice prio allowed to raise to + 0-39 for nice level 19 .. -20 */ +#define RLIMIT_RTPRIO 14 /* maximum realtime priority */ +#define RLIMIT_RTTIME 15 /* timeout for RT tasks in us */ +#define RLIM_NLIMITS 16 + +/* + * SuS says limits have to be unsigned. + * Which makes a ton more sense anyway. + * + * Some architectures override this (for compatibility reasons): + */ +#ifndef RLIM_INFINITY +# define RLIM_INFINITY (~0UL) +#endif + + +#endif /* _UAPI_ASM_GENERIC_RESOURCE_H */ -- cgit v1.3.1