[tip:x86/tdx 10/12] arch/x86/coco/tdx/tdx.c:729:32: warning: excess elements in struct initializer
From: kernel test robot
Date: Tue Sep 12 2023 - 19:15:39 EST
tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/tdx
head: d6cb0f01644c5cd2bc51b88df933e07849cfaa76
commit: 8cb19d6ef21bbf7e109336f895574ed2a267ea08 [10/12] x86/tdx: Remove 'struct tdx_hypercall_args'
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20230913/202309130740.KtUrIwC5-lkp@xxxxxxxxx/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230913/202309130740.KtUrIwC5-lkp@xxxxxxxxx/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202309130740.KtUrIwC5-lkp@xxxxxxxxx/
All warnings (new ones prefixed by >>):
arch/x86/coco/tdx/tdx.c: In function 'tdx_map_gpa':
arch/x86/coco/tdx/tdx.c:726:24: error: variable 'args' has initializer but incomplete type
726 | struct tdx_hypercall_args args = {
| ^~~~~~~~~~~~~~~~~~
arch/x86/coco/tdx/tdx.c:727:26: error: 'struct tdx_hypercall_args' has no member named 'r10'
727 | .r10 = TDX_HYPERCALL_STANDARD,
| ^~~
In file included from arch/x86/include/asm/tdx.h:11,
from arch/x86/coco/tdx/tdx.c:11:
arch/x86/include/asm/shared/tdx.h:8:33: warning: excess elements in struct initializer
8 | #define TDX_HYPERCALL_STANDARD 0
| ^
arch/x86/coco/tdx/tdx.c:727:32: note: in expansion of macro 'TDX_HYPERCALL_STANDARD'
727 | .r10 = TDX_HYPERCALL_STANDARD,
| ^~~~~~~~~~~~~~~~~~~~~~
arch/x86/include/asm/shared/tdx.h:8:33: note: (near initialization for 'args')
8 | #define TDX_HYPERCALL_STANDARD 0
| ^
arch/x86/coco/tdx/tdx.c:727:32: note: in expansion of macro 'TDX_HYPERCALL_STANDARD'
727 | .r10 = TDX_HYPERCALL_STANDARD,
| ^~~~~~~~~~~~~~~~~~~~~~
arch/x86/coco/tdx/tdx.c:728:26: error: 'struct tdx_hypercall_args' has no member named 'r11'
728 | .r11 = TDVMCALL_MAP_GPA,
| ^~~
arch/x86/include/asm/shared/tdx.h:25:41: warning: excess elements in struct initializer
25 | #define TDVMCALL_MAP_GPA 0x10001
| ^~~~~~~
arch/x86/coco/tdx/tdx.c:728:32: note: in expansion of macro 'TDVMCALL_MAP_GPA'
728 | .r11 = TDVMCALL_MAP_GPA,
| ^~~~~~~~~~~~~~~~
arch/x86/include/asm/shared/tdx.h:25:41: note: (near initialization for 'args')
25 | #define TDVMCALL_MAP_GPA 0x10001
| ^~~~~~~
arch/x86/coco/tdx/tdx.c:728:32: note: in expansion of macro 'TDVMCALL_MAP_GPA'
728 | .r11 = TDVMCALL_MAP_GPA,
| ^~~~~~~~~~~~~~~~
arch/x86/coco/tdx/tdx.c:729:26: error: 'struct tdx_hypercall_args' has no member named 'r12'
729 | .r12 = start,
| ^~~
>> arch/x86/coco/tdx/tdx.c:729:32: warning: excess elements in struct initializer
729 | .r12 = start,
| ^~~~~
arch/x86/coco/tdx/tdx.c:729:32: note: (near initialization for 'args')
arch/x86/coco/tdx/tdx.c:730:26: error: 'struct tdx_hypercall_args' has no member named 'r13'
730 | .r13 = end - start };
| ^~~
arch/x86/coco/tdx/tdx.c:730:32: warning: excess elements in struct initializer
730 | .r13 = end - start };
| ^~~
arch/x86/coco/tdx/tdx.c:730:32: note: (near initialization for 'args')
arch/x86/coco/tdx/tdx.c:726:43: error: storage size of 'args' isn't known
726 | struct tdx_hypercall_args args = {
| ^~~~
arch/x86/coco/tdx/tdx.c:733:27: error: implicit declaration of function '__tdx_hypercall_ret'; did you mean '__tdx_hypercall'? [-Werror=implicit-function-declaration]
733 | u64 ret = __tdx_hypercall_ret(&args);
| ^~~~~~~~~~~~~~~~~~~
| __tdx_hypercall
>> arch/x86/coco/tdx/tdx.c:726:43: warning: unused variable 'args' [-Wunused-variable]
726 | struct tdx_hypercall_args args = {
| ^~~~
cc1: some warnings being treated as errors
vim +729 arch/x86/coco/tdx/tdx.c
7dbde763162989 Kirill A. Shutemov 2022-04-06 707
7dbde763162989 Kirill A. Shutemov 2022-04-06 708 /*
019b383d1132e4 Dexuan Cui 2023-08-10 709 * Notify the VMM about page mapping conversion. More info about ABI
019b383d1132e4 Dexuan Cui 2023-08-10 710 * can be found in TDX Guest-Host-Communication Interface (GHCI),
019b383d1132e4 Dexuan Cui 2023-08-10 711 * section "TDG.VP.VMCALL<MapGPA>".
7dbde763162989 Kirill A. Shutemov 2022-04-06 712 */
019b383d1132e4 Dexuan Cui 2023-08-10 713 static bool tdx_map_gpa(phys_addr_t start, phys_addr_t end, bool enc)
7dbde763162989 Kirill A. Shutemov 2022-04-06 714 {
019b383d1132e4 Dexuan Cui 2023-08-10 715 /* Retrying the hypercall a second time should succeed; use 3 just in case */
019b383d1132e4 Dexuan Cui 2023-08-10 716 const int max_retries_per_page = 3;
019b383d1132e4 Dexuan Cui 2023-08-10 717 int retry_count = 0;
7dbde763162989 Kirill A. Shutemov 2022-04-06 718
7dbde763162989 Kirill A. Shutemov 2022-04-06 719 if (!enc) {
7dbde763162989 Kirill A. Shutemov 2022-04-06 720 /* Set the shared (decrypted) bits: */
7dbde763162989 Kirill A. Shutemov 2022-04-06 721 start |= cc_mkdec(0);
7dbde763162989 Kirill A. Shutemov 2022-04-06 722 end |= cc_mkdec(0);
7dbde763162989 Kirill A. Shutemov 2022-04-06 723 }
7dbde763162989 Kirill A. Shutemov 2022-04-06 724
019b383d1132e4 Dexuan Cui 2023-08-10 725 while (retry_count < max_retries_per_page) {
019b383d1132e4 Dexuan Cui 2023-08-10 @726 struct tdx_hypercall_args args = {
019b383d1132e4 Dexuan Cui 2023-08-10 727 .r10 = TDX_HYPERCALL_STANDARD,
019b383d1132e4 Dexuan Cui 2023-08-10 728 .r11 = TDVMCALL_MAP_GPA,
019b383d1132e4 Dexuan Cui 2023-08-10 @729 .r12 = start,
019b383d1132e4 Dexuan Cui 2023-08-10 730 .r13 = end - start };
019b383d1132e4 Dexuan Cui 2023-08-10 731
019b383d1132e4 Dexuan Cui 2023-08-10 732 u64 map_fail_paddr;
019b383d1132e4 Dexuan Cui 2023-08-10 733 u64 ret = __tdx_hypercall_ret(&args);
019b383d1132e4 Dexuan Cui 2023-08-10 734
019b383d1132e4 Dexuan Cui 2023-08-10 735 if (ret != TDVMCALL_STATUS_RETRY)
019b383d1132e4 Dexuan Cui 2023-08-10 736 return !ret;
7dbde763162989 Kirill A. Shutemov 2022-04-06 737 /*
019b383d1132e4 Dexuan Cui 2023-08-10 738 * The guest must retry the operation for the pages in the
019b383d1132e4 Dexuan Cui 2023-08-10 739 * region starting at the GPA specified in R11. R11 comes
019b383d1132e4 Dexuan Cui 2023-08-10 740 * from the untrusted VMM. Sanity check it.
7dbde763162989 Kirill A. Shutemov 2022-04-06 741 */
019b383d1132e4 Dexuan Cui 2023-08-10 742 map_fail_paddr = args.r11;
019b383d1132e4 Dexuan Cui 2023-08-10 743 if (map_fail_paddr < start || map_fail_paddr >= end)
019b383d1132e4 Dexuan Cui 2023-08-10 744 return false;
019b383d1132e4 Dexuan Cui 2023-08-10 745
019b383d1132e4 Dexuan Cui 2023-08-10 746 /* "Consume" a retry without forward progress */
019b383d1132e4 Dexuan Cui 2023-08-10 747 if (map_fail_paddr == start) {
019b383d1132e4 Dexuan Cui 2023-08-10 748 retry_count++;
019b383d1132e4 Dexuan Cui 2023-08-10 749 continue;
019b383d1132e4 Dexuan Cui 2023-08-10 750 }
019b383d1132e4 Dexuan Cui 2023-08-10 751
019b383d1132e4 Dexuan Cui 2023-08-10 752 start = map_fail_paddr;
019b383d1132e4 Dexuan Cui 2023-08-10 753 retry_count = 0;
019b383d1132e4 Dexuan Cui 2023-08-10 754 }
019b383d1132e4 Dexuan Cui 2023-08-10 755
019b383d1132e4 Dexuan Cui 2023-08-10 756 return false;
019b383d1132e4 Dexuan Cui 2023-08-10 757 }
019b383d1132e4 Dexuan Cui 2023-08-10 758
:::::: The code at line 729 was first introduced by commit
:::::: 019b383d1132e4051de0d2e43254454b86538cf4 x86/tdx: Retry partially-completed page conversion hypercalls
:::::: TO: Dexuan Cui <decui@xxxxxxxxxxxxx>
:::::: CC: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
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