diff options
| author | Tom Lendacky <thomas.lendacky@amd.com> | 2026-03-24 19:13:01 +0300 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2026-03-30 13:10:05 +0300 |
| commit | c3aa64ab6a5ea553ee70526579908936a3ff9392 (patch) | |
| tree | 31fe445f9d2e4f91b61404a04fcdb385e04685ca | |
| parent | f995fc377ac7d3757e1d94e6403940c4b8f3d76e (diff) | |
| download | linux-c3aa64ab6a5ea553ee70526579908936a3ff9392.tar.xz | |
crypto/ccp: Update HV_FIXED page states to allow freeing of memory
After SNP is disabled, any pages allocated as HV_FIXED can now be freed.
Update the page state of these pages and the snp_leak_hv_fixed_pages()
function to free pages on SNP_SHUTDOWN.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Tycho Andersen (AMD) <tycho@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Link: https://patch.msgid.link/20260324161301.1353976-8-tycho@kernel.org
| -rw-r--r-- | drivers/crypto/ccp/sev-dev.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index cc5c5b3ad66d..57f354721cd5 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -1219,7 +1219,7 @@ static void snp_add_hv_fixed_pages(struct sev_device *sev, struct sev_data_range static void snp_leak_hv_fixed_pages(void) { - struct snp_hv_fixed_pages_entry *entry; + struct snp_hv_fixed_pages_entry *entry, *nentry; /* List is protected by sev_cmd_mutex */ lockdep_assert_held(&sev_cmd_mutex); @@ -1227,10 +1227,16 @@ static void snp_leak_hv_fixed_pages(void) if (list_empty(&snp_hv_fixed_pages)) return; - list_for_each_entry(entry, &snp_hv_fixed_pages, list) - if (entry->page_state == HV_FIXED) + list_for_each_entry_safe(entry, nentry, &snp_hv_fixed_pages, list) { + if (entry->free && entry->page_state != HV_FIXED) + __free_pages(entry->page, entry->order); + else __snp_leak_pages(page_to_pfn(entry->page), 1 << entry->order, false); + + list_del(&entry->list); + kfree(entry); + } } bool sev_is_snp_ciphertext_hiding_supported(void) @@ -2077,6 +2083,7 @@ static int __sev_snp_shutdown_locked(int *error, bool panic) if (data.x86_snp_shutdown) { if (!panic) snp_shutdown(); + snp_hv_fixed_pages_state_update(sev, ALLOCATED); } else { /* * SNP_SHUTDOWN_EX with IOMMU_SNP_SHUTDOWN set to 1 disables SNP |