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arch: introduce set_direct_map_valid_noflush()

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Add an API that will allow updates of the direct/linear map for a set of
physically contiguous pages.

It will be used in the following patches.

Link: https://lkml.kernel.org/r/20241023162711.2579610-6-rppt@kernel.org
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Tested-by: kdevops <kdevops@lists.linux.dev>
Cc: Andreas Larsson <andreas@gaisler.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Brian Cain <bcain@quicinc.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Guo Ren <guoren@kernel.org>
Cc: Helge Deller <deller@gmx.de>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Liam R. Howlett <Liam.Howlett@Oracle.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Richard Weinberger <richard@nod.at>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Song Liu <song@kernel.org>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Vineet Gupta <vgupta@kernel.org>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Mike Rapoport (Microsoft) 2024-10-23 19:27:08 +03:00 committed by Andrew Morton
parent 0c133b1e78
commit 0c6378a715
11 changed files with 74 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm64/include/asm/set_memory.h
View File

@ -13,6 +13,7 @@ int set_memory_valid(unsigned long addr, int numpages, int enable);
int set_direct_map_invalid_noflush(struct page *page);
int set_direct_map_default_noflush(struct page *page);
int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid);
bool kernel_page_present(struct page *page);
#endif /* _ASM_ARM64_SET_MEMORY_H */

10
arch/arm64/mm/pageattr.c
View File

@ -192,6 +192,16 @@ int set_direct_map_default_noflush(struct page *page)
PAGE_SIZE, change_page_range, &data);
}
int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid)
{
unsigned long addr = (unsigned long)page_address(page);
if (!can_set_direct_map())
return 0;
return set_memory_valid(addr, nr, valid);
}
#ifdef CONFIG_DEBUG_PAGEALLOC
void __kernel_map_pages(struct page *page, int numpages, int enable)
{

1
arch/loongarch/include/asm/set_memory.h
View File

@ -17,5 +17,6 @@ int set_memory_rw(unsigned long addr, int numpages);
bool kernel_page_present(struct page *page);
int set_direct_map_default_noflush(struct page *page);
int set_direct_map_invalid_noflush(struct page *page);
int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid);
#endif /* _ASM_LOONGARCH_SET_MEMORY_H */

19
arch/loongarch/mm/pageattr.c
View File

@ -216,3 +216,22 @@ int set_direct_map_invalid_noflush(struct page *page)
return __set_memory(addr, 1, __pgprot(0), __pgprot(_PAGE_PRESENT | _PAGE_VALID));
}
int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid)
{
unsigned long addr = (unsigned long)page_address(page);
pgprot_t set, clear;
if (addr < vm_map_base)
return 0;
if (valid) {
set = PAGE_KERNEL;
clear = __pgprot(0);
} else {
set = __pgprot(0);
clear = __pgprot(_PAGE_PRESENT | _PAGE_VALID);
}
return __set_memory(addr, 1, set, clear);
}

1
arch/riscv/include/asm/set_memory.h
View File

@ -42,6 +42,7 @@ static inline int set_kernel_memory(char *startp, char *endp,
int set_direct_map_invalid_noflush(struct page *page);
int set_direct_map_default_noflush(struct page *page);
int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid);
bool kernel_page_present(struct page *page);
#endif /* __ASSEMBLY__ */

15
arch/riscv/mm/pageattr.c
View File

@ -386,6 +386,21 @@ int set_direct_map_default_noflush(struct page *page)
PAGE_KERNEL, __pgprot(_PAGE_EXEC));
}
int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid)
{
pgprot_t set, clear;
if (valid) {
set = PAGE_KERNEL;
clear = __pgprot(_PAGE_EXEC);
} else {
set = __pgprot(0);
clear = __pgprot(_PAGE_PRESENT);
}
return __set_memory((unsigned long)page_address(page), nr, set, clear);
}
#ifdef CONFIG_DEBUG_PAGEALLOC
static int debug_pagealloc_set_page(pte_t *pte, unsigned long addr, void *data)
{

1
arch/s390/include/asm/set_memory.h
View File

@ -62,5 +62,6 @@ __SET_MEMORY_FUNC(set_memory_4k, SET_MEMORY_4K)
int set_direct_map_invalid_noflush(struct page *page);
int set_direct_map_default_noflush(struct page *page);
int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid);
#endif

11
arch/s390/mm/pageattr.c
View File

@ -406,6 +406,17 @@ int set_direct_map_default_noflush(struct page *page)
return __set_memory((unsigned long)page_to_virt(page), 1, SET_MEMORY_DEF);
}
int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid)
{
unsigned long flags;
if (valid)
flags = SET_MEMORY_DEF;
else
flags = SET_MEMORY_INV;
return __set_memory((unsigned long)page_to_virt(page), nr, flags);
}
#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KFENCE)
static void ipte_range(pte_t *pte, unsigned long address, int nr)

1
arch/x86/include/asm/set_memory.h
View File

@ -89,6 +89,7 @@ int set_pages_rw(struct page *page, int numpages);
int set_direct_map_invalid_noflush(struct page *page);
int set_direct_map_default_noflush(struct page *page);
int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid);
bool kernel_page_present(struct page *page);
extern int kernel_set_to_readonly;

8
arch/x86/mm/pat/set_memory.c
View File

@ -2444,6 +2444,14 @@ int set_direct_map_default_noflush(struct page *page)
return __set_pages_p(page, 1);
}
int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid)
{
if (valid)
return __set_pages_p(page, nr);
return __set_pages_np(page, nr);
}
#ifdef CONFIG_DEBUG_PAGEALLOC
void __kernel_map_pages(struct page *page, int numpages, int enable)
{

6
include/linux/set_memory.h
View File

@ -34,6 +34,12 @@ static inline int set_direct_map_default_noflush(struct page *page)
return 0;
}
static inline int set_direct_map_valid_noflush(struct page *page,
unsigned nr, bool valid)
{
return 0;
}
static inline bool kernel_page_present(struct page *page)
{
return true;