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 --- drivers/md/dm-pcache/segment.c | 61 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 drivers/md/dm-pcache/segment.c (limited to 'drivers/md/dm-pcache/segment.c') diff --git a/drivers/md/dm-pcache/segment.c b/drivers/md/dm-pcache/segment.c new file mode 100644 index 000000000..8f8816e1c --- /dev/null +++ b/drivers/md/dm-pcache/segment.c @@ -0,0 +1,61 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +#include + +#include "pcache_internal.h" +#include "cache_dev.h" +#include "segment.h" + +int segment_copy_to_bio(struct pcache_segment *segment, + u32 data_off, u32 data_len, struct bio *bio, u32 bio_off) +{ + struct iov_iter iter; + size_t copied; + void *src; + + iov_iter_bvec(&iter, ITER_DEST, &bio->bi_io_vec[bio->bi_iter.bi_idx], + bio_segments(bio), bio->bi_iter.bi_size); + iter.iov_offset = bio->bi_iter.bi_offset; + if (bio_off) + iov_iter_advance(&iter, bio_off); + + src = segment->data + data_off; + copied = _copy_mc_to_iter(src, data_len, &iter); + if (copied != data_len) + return -EIO; + + return 0; +} + +int segment_copy_from_bio(struct pcache_segment *segment, + u32 data_off, u32 data_len, struct bio *bio, u32 bio_off) +{ + struct iov_iter iter; + size_t copied; + void *dst; + + iov_iter_bvec(&iter, ITER_SOURCE, &bio->bi_io_vec[bio->bi_iter.bi_idx], + bio_segments(bio), bio->bi_iter.bi_size); + iter.iov_offset = bio->bi_iter.bi_offset; + if (bio_off) + iov_iter_advance(&iter, bio_off); + + dst = segment->data + data_off; + copied = _copy_from_iter_flushcache(dst, data_len, &iter); + if (copied != data_len) + return -EIO; + pmem_wmb(); + + return 0; +} + +void pcache_segment_init(struct pcache_cache_dev *cache_dev, struct pcache_segment *segment, + struct pcache_segment_init_options *options) +{ + segment->seg_info = options->seg_info; + segment_info_set_type(segment->seg_info, options->type); + + segment->cache_dev = cache_dev; + segment->seg_id = options->seg_id; + segment->data_size = PCACHE_SEG_SIZE - options->data_off; + segment->data = CACHE_DEV_SEGMENT(cache_dev, options->seg_id) + options->data_off; +} -- cgit v1.3.1