[PATCH] x86/sgx: Print EREMOVE return value in __sgx_sanitize_pages()

[Jarkko Sakkinen]

In the 2nd run of __sgx_sanitize_pages() print the error
message. All EREMOVE's should succeed. This will allow to
provide some additional clues, if not.

Cc: Paul Menzel <pmenzel@xxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Reinette Chatre <reinette.chatre@xxxxxxxxx>
Signed-off-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
---
 arch/x86/kernel/cpu/sgx/main.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c
index 515e2a5f25bb..33354921c59f 100644
--- a/arch/x86/kernel/cpu/sgx/main.c
+++ b/arch/x86/kernel/cpu/sgx/main.c
@@ -50,7 +50,7 @@ static LIST_HEAD(sgx_dirty_page_list);
  * from the input list, and made available for the page allocator. SECS pages
  * prepending their children in the input list are left intact.
  */
-static void __sgx_sanitize_pages(struct list_head *dirty_page_list)
+static void __sgx_sanitize_pages(struct list_head *dirty_page_list, bool verbose)
 {
 	struct sgx_epc_page *page;
 	LIST_HEAD(dirty);
@@ -90,6 +90,9 @@ static void __sgx_sanitize_pages(struct list_head *dirty_page_list)
 			list_del(&page->list);
 			sgx_free_epc_page(page);
 		} else {
+			if (verbose)
+				pr_err_ratelimited(EREMOVE_ERROR_MESSAGE, ret, ret);
+
 			/* The page is not yet clean - move to the dirty list. */
 			list_move_tail(&page->list, &dirty);
 		}
@@ -394,8 +397,8 @@ static int ksgxd(void *p)
 	 * Sanitize pages in order to recover from kexec(). The 2nd pass is
 	 * required for SECS pages, whose child pages blocked EREMOVE.
 	 */
-	__sgx_sanitize_pages(&sgx_dirty_page_list);
-	__sgx_sanitize_pages(&sgx_dirty_page_list);
+	__sgx_sanitize_pages(&sgx_dirty_page_list, false);
+	__sgx_sanitize_pages(&sgx_dirty_page_list, true);
 
 	/* sanity check: */
 	WARN_ON(!list_empty(&sgx_dirty_page_list));
-- 
2.37.1


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