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| author | Fuad Tabba <fuad.tabba@linux.dev> | 2026-09-22 19:14:30 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2026-09-23 12:34:30 +0000 |
| commit | 2bc6b218717b9d08f466f88209251d54bc09b207 (patch) | |
| tree | cb91c941eccb15f94cbec4e96aa3a9c8736b5d66 /include/net/llc_sap.h | |
| download | linux-stable-2bc6b218717b9d08f466f88209251d54bc09b207.tar.gz linux-stable-2bc6b218717b9d08f466f88209251d54bc09b207.zip | |
arm64/boot: Disable trapping of PMZR_EL0 writes to EL2grafted
__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 <fuad.tabba@linux.dev>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: Oliver Upton <oupton@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'include/net/llc_sap.h')
| -rw-r--r-- | include/net/llc_sap.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/include/net/llc_sap.h b/include/net/llc_sap.h new file mode 100644 index 000000000..b259f5993 --- /dev/null +++ b/include/net/llc_sap.h @@ -0,0 +1,26 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef LLC_SAP_H +#define LLC_SAP_H + +#include <asm/types.h> + +/* + * Copyright (c) 1997 by Procom Technology,Inc. + * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br> + */ +struct llc_sap; +struct net_device; +struct sk_buff; +struct sock; + +void llc_sap_rtn_pdu(struct llc_sap *sap, struct sk_buff *skb); +void llc_save_primitive(struct sock *sk, struct sk_buff *skb, + unsigned char prim); +struct sk_buff *llc_alloc_frame(struct sock *sk, struct net_device *dev, + u8 type, u32 data_size); + +void llc_build_and_send_test_pkt(struct llc_sap *sap, struct sk_buff *skb, + unsigned char *dmac, unsigned char dsap); +void llc_build_and_send_xid_pkt(struct llc_sap *sap, struct sk_buff *skb, + unsigned char *dmac, unsigned char dsap); +#endif /* LLC_SAP_H */ |