The patch titled
Subject: x86/tdx: refactor try_accept_one()
has been added to the -mm mm-unstable branch. Its filename is
x86-tdx-refactor-try_accept_one.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/x86-tdx-refactor-try_accept_one.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: x86/tdx: refactor try_accept_one()
Date: Thu, 1 Jun 2023 21:25:42 +0300
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.
Link: https://lkml.kernel.org/r/20230601182543.19036-9-kirill.shutemov@xxxxxxxxxxxxxxx
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Suggested-by: Borislav Petkov <bp@xxxxxxxxx>
Reviewed-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: Dario Faggioli <dfaggioli@xxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Joerg Roedel <jroedel@xxxxxxx>
Cc: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
Cc: Liam Merwick <liam.merwick@xxxxxxxxxx>
Cc: Marcelo Henrique Cerri <marcelo.cerri@xxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Sean Christopherson <seanjc@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Tim Gardner <tim.gardner@xxxxxxxxxxxxx>
Cc: Tom Lendacky <thomas.lendacky@xxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/coco/tdx/tdx.c | 38 +++++++++++++++++++-------------------
1 file changed, 19 insertions(+), 19 deletions(-)
--- a/arch/x86/coco/tdx/tdx.c~x86-tdx-refactor-try_accept_one
+++ a/arch/x86/coco/tdx/tdx.c
@@ -713,18 +713,18 @@ static bool tdx_cache_flush_required(voi
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 *
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(unsig
*/
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;
_
Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are
mm-add-support-for-unaccepted-memory.patch
efi-x86-get-full-memory-map-in-allocate_e820.patch
efi-libstub-implement-support-for-unaccepted-memory.patch
x86-boot-compressed-handle-unaccepted-memory.patch
efi-add-unaccepted-memory-support.patch
efi-unaccepted-avoid-load_unaligned_zeropad-stepping-into-unaccepted-memory.patch
x86-tdx-make-_tdx_hypercall-and-__tdx_module_call-available-in-boot-stub.patch
x86-tdx-refactor-try_accept_one.patch
x86-tdx-add-unaccepted-memory-support.patch
