On 12/7/21 5:48 AM, Borislav Petkov wrote:
On Wed, Nov 10, 2021 at 04:07:00PM -0600, Brijesh Singh wrote:
diff --git a/arch/x86/boot/compressed/ident_map_64.c b/arch/x86/boot/compressed/ident_map_64.c
index f7213d0943b8..3cf7a7575f5c 100644
--- a/arch/x86/boot/compressed/ident_map_64.c
+++ b/arch/x86/boot/compressed/ident_map_64.c
@@ -275,15 +275,31 @@ static int set_clr_page_flags(struct x86_mapping_info *info,
* Changing encryption attributes of a page requires to flush it from
* the caches.
*/
- if ((set | clr) & _PAGE_ENC)
+ if ((set | clr) & _PAGE_ENC) {
clflush_page(address);
+ /*
+ * If the encryption attribute is being cleared, then change
+ * the page state to shared in the RMP table.
+ */
+ if (clr)
+ snp_set_page_shared(pte_pfn(*ptep) << PAGE_SHIFT);
So I'm wondering: __page_state_change() wants a physical address and
you're reading it out from the PTE here.
Why not do
__pa(address & PAGE_MASK);
like it is usually done?
I am okay to use __pa().
thanks
