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kho: replace kho_preserve_phys() with kho_preserve_pages() 

to make it clear that KHO operates on pages rather than on a random
physical address.

The kho_preserve_pages() will be also used in upcoming support for vmalloc
preservation.

Link: https://lkml.kernel.org/r/20250921054458.4043761-3-rppt@kernel.org
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Cc: Alexander Graf <graf@amazon.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Changyuan Lyu <changyuanl@google.com>
Cc: Chris Li <chrisl@kernel.org>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Mike Rapoport (Microsoft) 2025-09-21 08:44:56 +03:00 committed by Andrew Morton
parent 469661d0d3
commit 8375b76517
3 changed files with 18 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/linux/kexec_handover.h
View File

@ -18,6 +18,7 @@ enum kho_event {
struct folio;
struct notifier_block;
struct page;
#define DECLARE_KHOSER_PTR(name, type) \
union { \
@ -43,7 +44,7 @@ bool kho_is_enabled(void);
bool is_kho_boot(void);
int kho_preserve_folio(struct folio *folio);
int kho_preserve_phys(phys_addr_t phys, size_t size);
int kho_preserve_pages(struct page *page, unsigned int nr_pages);
struct folio *kho_restore_folio(phys_addr_t phys);
int kho_add_subtree(struct kho_serialization *ser, const char *name, void *fdt);
int kho_retrieve_subtree(const char *name, phys_addr_t *phys);
@ -71,7 +72,7 @@ static inline int kho_preserve_folio(struct folio *folio)
return -EOPNOTSUPP;
}
static inline int kho_preserve_phys(phys_addr_t phys, size_t size)
static inline int kho_preserve_pages(struct page *page, unsigned int nr_pages)
{
return -EOPNOTSUPP;
}

27
kernel/kexec_handover.c
View File

@ -725,26 +725,23 @@ int kho_preserve_folio(struct folio *folio)
EXPORT_SYMBOL_GPL(kho_preserve_folio);
/**
* kho_preserve_phys - preserve a physically contiguous range across kexec.
* @phys: physical address of the range.
* @size: size of the range.
* kho_preserve_pages - preserve contiguous pages across kexec
* @page: first page in the list.
* @nr_pages: number of pages.
*
* Instructs KHO to preserve the memory range from @phys to @phys + @size
* across kexec.
* Preserve a contiguous list of order 0 pages. Must be restored using
* kho_restore_pages() to ensure the pages are restored properly as order 0.
*
* Return: 0 on success, error code on failure
*/
int kho_preserve_phys(phys_addr_t phys, size_t size)
int kho_preserve_pages(struct page *page, unsigned int nr_pages)
{
unsigned long pfn = PHYS_PFN(phys);
unsigned long failed_pfn = 0;
const unsigned long start_pfn = pfn;
const unsigned long end_pfn = PHYS_PFN(phys + size);
int err = 0;
struct kho_mem_track *track = &kho_out.ser.track;
if (!PAGE_ALIGNED(phys) || !PAGE_ALIGNED(size))
return -EINVAL;
const unsigned long start_pfn = page_to_pfn(page);
const unsigned long end_pfn = start_pfn + nr_pages;
unsigned long pfn = start_pfn;
unsigned long failed_pfn = 0;
int err = 0;
while (pfn < end_pfn) {
const unsigned int order =
@ -764,7 +761,7 @@ int kho_preserve_phys(phys_addr_t phys, size_t size)
return err;
}
EXPORT_SYMBOL_GPL(kho_preserve_phys);
EXPORT_SYMBOL_GPL(kho_preserve_pages);
/* Handling for debug/kho/out */

4
mm/memblock.c
View File

@ -2452,8 +2452,10 @@ static int reserve_mem_kho_finalize(struct kho_serialization *ser)
for (i = 0; i < reserved_mem_count; i++) {
struct reserve_mem_table *map = &reserved_mem_table[i];
struct page *page = phys_to_page(map->start);
unsigned int nr_pages = map->size >> PAGE_SHIFT;
err |= kho_preserve_phys(map->start, map->size);
err |= kho_preserve_pages(page, nr_pages);
}
err |= kho_preserve_folio(page_folio(kho_fdt));