diff mbox series

[tip:,x86/cc] x86/tdx: Refactor try_accept_one()

Message ID 168608055842.404.11233367615561114327.tip-bot2@tip-bot2
State New
Headers
Series [tip:,x86/cc] x86/tdx: Refactor try_accept_one() |

Commit Message

tip-bot2 for Thomas Gleixner June 6, 2023, 7:42 p.m. UTC 
  The following commit has been merged into the x86/cc branch of tip:

Commit-ID:     c2b353ae24d6fecddcc599529ad8319282494781
Gitweb:        https://git.kernel.org/tip/c2b353ae24d6fecddcc599529ad8319282494781
Author:        Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
AuthorDate:    Tue, 06 Jun 2023 17:26:36 +03:00
Committer:     Borislav Petkov (AMD) <bp@alien8.de>
CommitterDate: Tue, 06 Jun 2023 17:38:50 +02:00

x86/tdx: Refactor try_accept_one()

Rework try_accept_one() to return accepted size instead of modifying
'start' inside the helper. It makes 'start' in-only argument and
streamlines code on the caller side.

Suggested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lore.kernel.org/r/20230606142637.5171-9-kirill.shutemov@linux.intel.com
---
 arch/x86/coco/tdx/tdx.c | 38 +++++++++++++++++++-------------------
 1 file changed, 19 insertions(+), 19 deletions(-)
diff mbox series

Patch

diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c
index e6f4c27..0d5fe6e 100644
--- a/arch/x86/coco/tdx/tdx.c
+++ b/arch/x86/coco/tdx/tdx.c
@@ -713,18 +713,18 @@  static bool tdx_cache_flush_required(void)
 	return true;
 }
 
-static bool try_accept_one(phys_addr_t *start, unsigned long len,
-			  enum pg_level pg_level)
+static unsigned long try_accept_one(phys_addr_t start, unsigned long len,
+				    enum pg_level pg_level)
 {
 	unsigned long accept_size = page_level_size(pg_level);
 	u64 tdcall_rcx;
 	u8 page_size;
 
-	if (!IS_ALIGNED(*start, accept_size))
-		return false;
+	if (!IS_ALIGNED(start, accept_size))
+		return 0;
 
 	if (len < accept_size)
-		return false;
+		return 0;
 
 	/*
 	 * Pass the page physical address to the TDX module to accept the
@@ -743,15 +743,14 @@  static bool try_accept_one(phys_addr_t *start, unsigned long len,
 		page_size = 2;
 		break;
 	default:
-		return false;
+		return 0;
 	}
 
-	tdcall_rcx = *start | page_size;
+	tdcall_rcx = start | page_size;
 	if (__tdx_module_call(TDX_ACCEPT_PAGE, tdcall_rcx, 0, 0, 0, NULL))
-		return false;
+		return 0;
 
-	*start += accept_size;
-	return true;
+	return accept_size;
 }
 
 /*
@@ -788,21 +787,22 @@  static bool tdx_enc_status_changed(unsigned long vaddr, int numpages, bool enc)
 	 */
 	while (start < end) {
 		unsigned long len = end - start;
+		unsigned long accept_size;
 
 		/*
 		 * Try larger accepts first. It gives chance to VMM to keep
-		 * 1G/2M SEPT entries where possible and speeds up process by
-		 * cutting number of hypercalls (if successful).
+		 * 1G/2M Secure EPT entries where possible and speeds up
+		 * process by cutting number of hypercalls (if successful).
 		 */
 
-		if (try_accept_one(&start, len, PG_LEVEL_1G))
-			continue;
-
-		if (try_accept_one(&start, len, PG_LEVEL_2M))
-			continue;
-
-		if (!try_accept_one(&start, len, PG_LEVEL_4K))
+		accept_size = try_accept_one(start, len, PG_LEVEL_1G);
+		if (!accept_size)
+			accept_size = try_accept_one(start, len, PG_LEVEL_2M);
+		if (!accept_size)
+			accept_size = try_accept_one(start, len, PG_LEVEL_4K);
+		if (!accept_size)
 			return false;
+		start += accept_size;
 	}
 
 	return true;