Zhenhua Huang 558b8ee45f mm,kfence: decouple kfence from page granularity mapping judgement ... [ Upstream commit bfa7965b33 ] Kfence only needs its pool to be mapped as page granularity, if it is inited early. Previous judgement was a bit over protected. From [1], Mark suggested to "just map the KFENCE region a page granularity". So I decouple it from judgement and do page granularity mapping for kfence pool only. Need to be noticed that late init of kfence pool still requires page granularity mapping. Page granularity mapping in theory cost more(2M per 1GB) memory on arm64 platform. Like what I've tested on QEMU(emulated 1GB RAM) with gki_defconfig, also turning off rodata protection: Before: [root@liebao ]# cat /proc/meminfo MemTotal: 999484 kB After: [root@liebao ]# cat /proc/meminfo MemTotal: 1001480 kB To implement this, also relocate the kfence pool allocation before the linear mapping setting up, arm64_kfence_alloc_pool is to allocate phys addr, __kfence_pool is to be set after linear mapping set up. LINK: [1] https://lore.kernel.org/linux-arm-kernel/Y+IsdrvDNILA59UN@FVFF77S0Q05N/ Suggested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Zhenhua Huang <quic_zhenhuah@quicinc.com> Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com> Reviewed-by: Marco Elver <elver@google.com> Link: https://lore.kernel.org/r/1679066974-690-1-git-send-email-quic_zhenhuah@quicinc.com Signed-off-by: Will Deacon <will@kernel.org> Stable-dep-of: acfa60dbe0 ("arm64: mm: Fix "rodata=on" when CONFIG_RODATA_FULL_DEFAULT_ENABLED=y") Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-12-03 07:32:08 +01:00
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.kunitconfig	kfence: test: use new suite_{init/exit} support, add .kunitconfig	2022-05-02 12:35:57 -06:00
core.c	mm,kfence: decouple kfence from page granularity mapping judgement	2023-12-03 07:32:08 +01:00
kfence_test.c	Yang Shi has improved the behaviour of khugepaged collapsing of readonly	2022-05-26 12:32:41 -07:00
kfence.h	mm, kfence: support kmem_dump_obj() for KFENCE objects	2022-04-15 14:49:55 -07:00
Makefile	kfence: avoid passing -g for test	2023-03-30 12:49:25 +02:00
report.c	panic: Consolidate open-coded panic_on_warn checks	2023-01-24 07:24:41 +01:00