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s390: Make UV folio operations work on whole folio

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uv_destroy_folio() and uv_convert_from_secure_folio() should work on
all pages in the folio, not just the first one.

This was fine until now, but it will become a problem with upcoming
patches.

Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
This commit is contained in:
Claudio Imbrenda 2026-02-04 16:02:32 +01:00
parent 013bf0f57e
commit 21401ce497
1 changed files with 12 additions and 10 deletions
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22
arch/s390/kernel/uv.c
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@ -134,14 +134,15 @@ static int uv_destroy(unsigned long paddr)
*/
int uv_destroy_folio(struct folio *folio)
{
unsigned long i;
int rc;
/* Large folios cannot be secure */
if (unlikely(folio_test_large(folio)))
return 0;
folio_get(folio);
rc = uv_destroy(folio_to_phys(folio));
for (i = 0; i < (1 << folio_order(folio)); i++) {
rc = uv_destroy(folio_to_phys(folio) + i * PAGE_SIZE);
if (rc)
break;
}
if (!rc)
clear_bit(PG_arch_1, &folio->flags.f);
folio_put(folio);
@ -183,14 +184,15 @@ EXPORT_SYMBOL_GPL(uv_convert_from_secure);
*/
int uv_convert_from_secure_folio(struct folio *folio)
{
unsigned long i;
int rc;
/* Large folios cannot be secure */
if (unlikely(folio_test_large(folio)))
return 0;
folio_get(folio);
rc = uv_convert_from_secure(folio_to_phys(folio));
for (i = 0; i < (1 << folio_order(folio)); i++) {
rc = uv_convert_from_secure(folio_to_phys(folio) + i * PAGE_SIZE);
if (rc)
break;
}
if (!rc)
clear_bit(PG_arch_1, &folio->flags.f);
folio_put(folio);