5.15-stable review patch. If anyone has any objections, please let me know.
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From: Matthew Wilcox (Oracle) willy@infradead.org
[ Upstream commit 259e660d91d0e7261ae0ee37bb37266d6006a546 ]
These page APIs are deprecated, so convert the incoming page to a folio and use the folio APIs instead. The ultravisor API cannot handle large folios, so return -EINVAL if one has slipped through.
Acked-by: Claudio Imbrenda imbrenda@linux.ibm.com Signed-off-by: Matthew Wilcox (Oracle) willy@infradead.org Link: https://lore.kernel.org/r/20240322161149.2327518-2-willy@infradead.org Signed-off-by: Alexander Gordeev agordeev@linux.ibm.com Stable-dep-of: 3f29f6537f54 ("s390/uv: Don't call folio_wait_writeback() without a folio reference") Signed-off-by: Sasha Levin sashal@kernel.org --- arch/s390/kernel/uv.c | 29 ++++++++++++++++------------- 1 file changed, 16 insertions(+), 13 deletions(-)
diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c index bdf4d2bed87c5..425f6e4b30267 100644 --- a/arch/s390/kernel/uv.c +++ b/arch/s390/kernel/uv.c @@ -172,21 +172,21 @@ int uv_convert_owned_from_secure(unsigned long paddr) }
/* - * Calculate the expected ref_count for a page that would otherwise have no + * Calculate the expected ref_count for a folio that would otherwise have no * further pins. This was cribbed from similar functions in other places in * the kernel, but with some slight modifications. We know that a secure - * page can not be a huge page for example. + * folio can not be a large folio, for example. */ -static int expected_page_refs(struct page *page) +static int expected_folio_refs(struct folio *folio) { int res;
- res = page_mapcount(page); - if (PageSwapCache(page)) { + res = folio_mapcount(folio); + if (folio_test_swapcache(folio)) { res++; - } else if (page_mapping(page)) { + } else if (folio_mapping(folio)) { res++; - if (page_has_private(page)) + if (folio->private) res++; } return res; @@ -194,14 +194,17 @@ static int expected_page_refs(struct page *page)
static int make_page_secure(struct page *page, struct uv_cb_header *uvcb) { + struct folio *folio = page_folio(page); int expected, cc = 0;
- if (PageWriteback(page)) + if (folio_test_large(folio)) + return -EINVAL; + if (folio_test_writeback(folio)) return -EAGAIN; - expected = expected_page_refs(page); - if (!page_ref_freeze(page, expected)) + expected = expected_folio_refs(folio); + if (!folio_ref_freeze(folio, expected)) return -EBUSY; - set_bit(PG_arch_1, &page->flags); + set_bit(PG_arch_1, &folio->flags); /* * If the UVC does not succeed or fail immediately, we don't want to * loop for long, or we might get stall notifications. @@ -211,9 +214,9 @@ static int make_page_secure(struct page *page, struct uv_cb_header *uvcb) * -EAGAIN and we let the callers deal with it. */ cc = __uv_call(0, (u64)uvcb); - page_ref_unfreeze(page, expected); + folio_ref_unfreeze(folio, expected); /* - * Return -ENXIO if the page was not mapped, -EINVAL for other errors. + * Return -ENXIO if the folio was not mapped, -EINVAL for other errors. * If busy or partially completed, return -EAGAIN. */ if (cc == UVC_CC_OK)