public-mirrors/linux
1
0
Fork 0
mirror of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-08-05 16:54:27 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

x86/virt/tdx: Handle SEAMCALL no entropy error in common code

Browse source 
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
This commit is contained in:
Kai Huang 2023-12-08 09:07:24 -08:00 • committed by Dave Hansen
parent 3115cabd93
commit 1e66a7e275
1 changed files with 26 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

26
arch/x86/include/asm/tdx.h
View file

@ -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 */