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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/netns/smc.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/netns/smc.h')
| -rw-r--r-- | include/net/netns/smc.h | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/include/net/netns/smc.h b/include/net/netns/smc.h new file mode 100644 index 000000000..ed24c9f63 --- /dev/null +++ b/include/net/netns/smc.h @@ -0,0 +1,33 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __NETNS_SMC_H__ +#define __NETNS_SMC_H__ +#include <linux/mutex.h> +#include <linux/percpu.h> + +struct smc_stats_rsn; +struct smc_stats; +struct netns_smc { + /* per cpu counters for SMC */ + struct smc_stats __percpu *smc_stats; + /* protect fback_rsn */ + struct mutex mutex_fback_rsn; + struct smc_stats_rsn *fback_rsn; + + bool limit_smc_hs; /* constraint on handshake */ +#ifdef CONFIG_SYSCTL + struct ctl_table_header *smc_hdr; +#endif +#if IS_ENABLED(CONFIG_SMC_HS_CTRL_BPF) + struct smc_hs_ctrl __rcu *hs_ctrl; +#endif /* CONFIG_SMC_HS_CTRL_BPF */ + unsigned int sysctl_autocorking_size; + unsigned int sysctl_smcr_buf_type; + int sysctl_smcr_testlink_time; + int sysctl_wmem; + int sysctl_rmem; + int sysctl_max_links_per_lgr; + int sysctl_max_conns_per_lgr; + unsigned int sysctl_smcr_max_send_wr; + unsigned int sysctl_smcr_max_recv_wr; +}; +#endif |