diff options
| author | Kai Huang <kai.huang@intel.com> | 2023-12-08 20:07:24 +0300 |
|---|---|---|
| committer | Dave Hansen <dave.hansen@linux.intel.com> | 2023-12-08 20:12:06 +0300 |
| commit | 1e66a7e275393055d98d2306771fe1feadeb1cd6 (patch) | |
| tree | 74dfb5d514aaf673468ccd5828848992e4b413cc /arch/x86/include/asm/tdx.h | |
| parent | 3115cabd935ade76fbe61154d1e405158e548272 (diff) | |
| download | linux-1e66a7e275393055d98d2306771fe1feadeb1cd6.tar.xz | |
x86/virt/tdx: Handle SEAMCALL no entropy error in common code
Some SEAMCALLs use the RDRAND hardware and can fail for the same reasons
as RDRAND. Use the kernel RDRAND retry logic for them.
There are three __seamcall*() variants. Do the SEAMCALL retry in common
code and add a wrapper for each of them.
Signed-off-by: Kai Huang <kai.huang@intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Kirill A. Shutemov <kirll.shutemov@linux.intel.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lore.kernel.org/all/20231208170740.53979-4-dave.hansen%40intel.com
Diffstat (limited to 'arch/x86/include/asm/tdx.h')
| -rw-r--r-- | arch/x86/include/asm/tdx.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h index e5dd1cb0e1a1..24c0357081bd 100644 --- a/arch/x86/include/asm/tdx.h +++ b/arch/x86/include/asm/tdx.h @@ -24,6 +24,11 @@ #define TDX_SEAMCALL_GP (TDX_SW_ERROR | X86_TRAP_GP) #define TDX_SEAMCALL_UD (TDX_SW_ERROR | X86_TRAP_UD) +/* + * TDX module SEAMCALL leaf function error codes + */ +#define TDX_RND_NO_ENTROPY 0x8000020300000000ULL + #ifndef __ASSEMBLY__ /* @@ -84,6 +89,27 @@ u64 __seamcall(u64 fn, struct tdx_module_args *args); u64 __seamcall_ret(u64 fn, struct tdx_module_args *args); u64 __seamcall_saved_ret(u64 fn, struct tdx_module_args *args); void tdx_init(void); + +#include <asm/archrandom.h> + +typedef u64 (*sc_func_t)(u64 fn, struct tdx_module_args *args); + +static inline u64 sc_retry(sc_func_t func, u64 fn, + struct tdx_module_args *args) +{ + int retry = RDRAND_RETRY_LOOPS; + u64 ret; + + do { + ret = func(fn, args); + } while (ret == TDX_RND_NO_ENTROPY && --retry); + + return ret; +} + +#define seamcall(_fn, _args) sc_retry(__seamcall, (_fn), (_args)) +#define seamcall_ret(_fn, _args) sc_retry(__seamcall_ret, (_fn), (_args)) +#define seamcall_saved_ret(_fn, _args) sc_retry(__seamcall_saved_ret, (_fn), (_args)) #else static inline void tdx_init(void) { } #endif /* CONFIG_INTEL_TDX_HOST */ |