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x86/mm/32: implement arch_sync_kernel_mappings()

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Implement the function to sync changes in vmalloc and ioremap ranges to
all page-tables.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H . Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Link: http://lkml.kernel.org/r/20200515140023.25469-6-joro@8bytes.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joerg Roedel 2020-06-01 21:52:33 -07:00 committed by Linus Torvalds
parent 8e19843c36
commit 86cf69f1d8
3 changed files with 20 additions and 9 deletions
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2
arch/x86/include/asm/pgtable-2level_types.h
View File

@ -20,6 +20,8 @@ typedef union {
#define SHARED_KERNEL_PMD 0
#define ARCH_PAGE_TABLE_SYNC_MASK PGTBL_PMD_MODIFIED
/*
* traditional i386 two-level paging structure:
*/

2
arch/x86/include/asm/pgtable-3level_types.h
View File

@ -27,6 +27,8 @@ typedef union {
#define SHARED_KERNEL_PMD (!static_cpu_has(X86_FEATURE_PTI))
#endif
#define ARCH_PAGE_TABLE_SYNC_MASK (SHARED_KERNEL_PMD ? 0 : PGTBL_PMD_MODIFIED)
/*
* PGDIR_SHIFT determines what a top-level page table entry can map
*/

25
arch/x86/mm/fault.c
View File

@ -190,16 +190,13 @@ static inline pmd_t *vmalloc_sync_one(pgd_t *pgd, unsigned long address)
return pmd_k;
}
static void vmalloc_sync(void)
void arch_sync_kernel_mappings(unsigned long start, unsigned long end)
{
unsigned long address;
unsigned long addr;
if (SHARED_KERNEL_PMD)
return;
for (address = VMALLOC_START & PMD_MASK;
address >= TASK_SIZE_MAX && address < VMALLOC_END;
address += PMD_SIZE) {
for (addr = start & PMD_MASK;
addr >= TASK_SIZE_MAX && addr < VMALLOC_END;
addr += PMD_SIZE) {
struct page *page;
spin_lock(&pgd_lock);
@ -210,13 +207,23 @@ static void vmalloc_sync(void)
pgt_lock = &pgd_page_get_mm(page)->page_table_lock;
spin_lock(pgt_lock);
vmalloc_sync_one(page_address(page), address);
vmalloc_sync_one(page_address(page), addr);
spin_unlock(pgt_lock);
}
spin_unlock(&pgd_lock);
}
}
static void vmalloc_sync(void)
{
unsigned long address;
if (SHARED_KERNEL_PMD)
return;
arch_sync_kernel_mappings(VMALLOC_START, VMALLOC_END);
}
void vmalloc_sync_mappings(void)
{
vmalloc_sync();