| 139d42ca | 12-Nov-2024 |
Kanglong Wang <wangkanglong@loongson.cn> |
LoongArch: Add WriteCombine shadow mapping in KASAN
Currently, the kernel couldn't boot when ARCH_IOREMAP, ARCH_WRITECOMBINE
and KASAN are enabled together. Because DMW2 is used by kernel now which
LoongArch: Add WriteCombine shadow mapping in KASAN
Currently, the kernel couldn't boot when ARCH_IOREMAP, ARCH_WRITECOMBINE
and KASAN are enabled together. Because DMW2 is used by kernel now which
is configured as 0xa000000000000000 for WriteCombine, but KASAN has no
segment mapping for it. This patch fix this issue.
Solution: Add the relevant definitions for WriteCombine (DMW2) in KASAN.
Cc: stable@vger.kernel.org
Fixes: 8e02c3b782ec ("LoongArch: Add writecombine support for DMW-based ioremap()")
Signed-off-by: Kanglong Wang <wangkanglong@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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| 227ca9f6 | 12-Nov-2024 |
Huacai Chen <chenhuacai@loongson.cn> |
LoongArch: Disable KASAN if PGDIR_SIZE is too large for cpu_vabits
If PGDIR_SIZE is too large for cpu_vabits, KASAN_SHADOW_END will
overflow UINTPTR_MAX because KASAN_SHADOW_START/KASAN_SHADOW_END a
LoongArch: Disable KASAN if PGDIR_SIZE is too large for cpu_vabits
If PGDIR_SIZE is too large for cpu_vabits, KASAN_SHADOW_END will
overflow UINTPTR_MAX because KASAN_SHADOW_START/KASAN_SHADOW_END are
aligned up by PGDIR_SIZE. And then the overflowed KASAN_SHADOW_END looks
like a user space address.
For example, PGDIR_SIZE of CONFIG_4KB_4LEVEL is 2^39, which is too large
for Loongson-2K series whose cpu_vabits = 39.
Since CONFIG_4KB_4LEVEL is completely legal for CPUs with cpu_vabits <=
39, we just disable KASAN via early return in kasan_init(). Otherwise we
get a boot failure.
Moreover, we change KASAN_SHADOW_END from the first address after KASAN
shadow area to the last address in KASAN shadow area, in order to avoid
the end address exactly overflow to 0 (which is a legal case). We don't
need to worry about alignment because pgd_addr_end() can handle it.
Cc: stable@vger.kernel.org
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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| f93f67d0 | 24-Sep-2024 |
Huacai Chen <chenhuacai@loongson.cn> |
LoongArch: Improve hardware page table walker
LoongArch has similar problems explained in commit 7f0b1bf04511348995d6
("arm64: Fix barriers used for page table modifications"), when hardware
page ta
LoongArch: Improve hardware page table walker
LoongArch has similar problems explained in commit 7f0b1bf04511348995d6
("arm64: Fix barriers used for page table modifications"), when hardware
page table walker (PTW) enabled, speculative accesses may cause spurious
page fault in kernel space. Theoretically, in order to completely avoid
spurious page fault we need a "dbar + ibar" pair between the page table
modifications and the subsequent memory accesses using the corresponding
virtual address. But "ibar" is too heavy for performace, so we only use
a "dbar 0b11000" in set_pte(). And let spurious_fault() filter the rest
rare spurious page faults which should be avoided by "ibar".
Besides, we replace the llsc loop with amo in set_pte() which has better
performace, and refactor mmu_context.h to 1) avoid any load/store/branch
instructions between the writing of CSR.ASID & CSR.PGDL, 2) ensure flush
tlb operation is after updating ASID.
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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| f04de6d8 | 24-Sep-2024 |
Huacai Chen <chenhuacai@loongson.cn> |
LoongArch: Add ARCH_HAS_SET_DIRECT_MAP support
Add set_direct_map_*() functions for setting the direct map alias for
the page to its default permissions and to an invalid state that cannot
be cached
LoongArch: Add ARCH_HAS_SET_DIRECT_MAP support
Add set_direct_map_*() functions for setting the direct map alias for
the page to its default permissions and to an invalid state that cannot
be cached in a TLB. (See d253ca0c3 ("x86/mm/cpa: Add set_direct_map_*()
functions")) Add a similar implementation for LoongArch.
This fixes the KFENCE warnings during hibernation:
==================================================================
BUG: KFENCE: invalid read in swsusp_save+0x368/0x4d8
Invalid read at 0x00000000f7b89a3c:
swsusp_save+0x368/0x4d8
hibernation_snapshot+0x3f0/0x4e0
hibernate+0x20c/0x440
state_store+0x128/0x140
kernfs_fop_write_iter+0x160/0x260
vfs_write+0x2c0/0x520
ksys_write+0x74/0x160
do_syscall+0xb0/0x160
CPU: 0 UID: 0 PID: 812 Comm: bash Tainted: G B 6.11.0-rc1+ #1566
Tainted: [B]=BAD_PAGE
Hardware name: Loongson-LS3A5000-7A1000-1w-CRB, BIOS vUDK2018-LoongArch-V2.0.0 10/21/2022
==================================================================
Note: We can only set permissions for KVRANGE/XKVRANGE kernel addresses.
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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| 9636f055 | 18-Mar-2024 |
Peter Xu <peterx@redhat.com> |
mm/treewide: remove pXd_huge()
This API is not used anymore, drop it for the whole tree.
Link: https://lkml.kernel.org/r/20240318200404.448346-13-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@r
mm/treewide: remove pXd_huge()
This API is not used anymore, drop it for the whole tree.
Link: https://lkml.kernel.org/r/20240318200404.448346-13-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Andreas Larsson <andreas@gaisler.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Bjorn Andersson <andersson@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Fabio Estevam <festevam@denx.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Konrad Dybcio <konrad.dybcio@linaro.org>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Mark Salter <msalter@redhat.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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