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P-SEAMLDR can update the TDX module at runtime. > Software can talk with P-SEAMLDR via SEAMCALLs with the bit 63 of RAX > (leaf number) set to 1 (a.k.a P-SEAMLDR SEAMCALLs). > > P-SEAMLDR SEAMCALLs differ from SEAMCALLs of the TDX module in terms of > error codes and the handling of the current VMCS. > > In preparation for adding support for P-SEAMLDR SEAMCALLs, do the two > following changes to SEAMCALL low-level helpers: > > 1) Tweak sc_retry() to retry on "lack of entropy" errors reported by > P-SEAMLDR because it uses a different error code. > > 2) Add seamldr_err() to log error messages on P-SEAMLDR SEAMCALL failures. > > Signed-off-by: Chao Gao > Tested-by: Farrah Chen > --- > Add seamldr_prerr() as a macro to be consistent with existing code. If > maintainers would like to switch these to static inline functions then I > would be happy to add a new patch to convert existing macros to static > inline functions and build on that. > > v2: > - use a macro rather than an inline function for seamldr_err() for > consistency. > --- > arch/x86/include/asm/tdx.h | 5 +++++ > arch/x86/virt/vmx/tdx/seamcall.h | 29 ++++++++++++++++++++++++++++- > 2 files changed, 33 insertions(+), 1 deletion(-) > > diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h > index e872a411a359..7ad026618a23 100644 > --- a/arch/x86/include/asm/tdx.h > +++ b/arch/x86/include/asm/tdx.h > @@ -32,6 +32,11 @@ > #define TDX_SUCCESS 0ULL > #define TDX_RND_NO_ENTROPY 0x8000020300000000ULL > > +/* P-SEAMLDR SEAMCALL leaf function error codes */ > +#define SEAMLDR_RND_NO_ENTROPY 0x8000000000030001ULL > + > +#define SEAMLDR_SEAMCALL_MASK _BITUL(63) > + > #ifndef __ASSEMBLER__ > > #include > diff --git a/arch/x86/virt/vmx/tdx/seamcall.h b/arch/x86/virt/vmx/tdx/seamcall.h > index 71b6ffddfa40..3f462e58d68e 100644 > --- a/arch/x86/virt/vmx/tdx/seamcall.h > +++ b/arch/x86/virt/vmx/tdx/seamcall.h > @@ -14,6 +14,19 @@ u64 __seamcall_saved_ret(u64 fn, struct tdx_module_args *args); > > typedef u64 (*sc_func_t)(u64 fn, struct tdx_module_args *args); > > +static inline bool is_seamldr_call(u64 fn) > +{ > + return fn & SEAMLDR_SEAMCALL_MASK; > +} > + > +static inline bool sc_need_retry(u64 fn, u64 error_code) > +{ > + if (is_seamldr_call(fn)) Do we need to have this check, can TDX module seamcall return value SEAMLDR_RND_NO_ENTROPY but for different reason? > + return error_code == SEAMLDR_RND_NO_ENTROPY; > + else > + return error_code == TDX_RND_NO_ENTROPY; > +} > + > static __always_inline u64 sc_retry(sc_func_t func, u64 fn, > struct tdx_module_args *args) > { > @@ -22,7 +35,7 @@ static __always_inline u64 sc_retry(sc_func_t func, u64 fn, > > do { > ret = func(fn, args); > - } while (ret == TDX_RND_NO_ENTROPY && --retry); > + } while (sc_need_retry(fn, ret) && --retry); > > return ret; > } > @@ -48,6 +61,17 @@ static inline void seamcall_err_ret(u64 fn, u64 err, > args->r9, args->r10, args->r11); > } > > +static inline void seamldr_err(u64 fn, u64 err, struct tdx_module_args *args) > +{ > + /* > + * Get the actual leaf number. No need to print the bit used to > + * differentiate between P-SEAMLDR and TDX module as the "P-SEAMLDR" > + * string in the error message already provides that information. > + */ > + fn &= ~SEAMLDR_SEAMCALL_MASK; > + pr_err("P-SEAMLDR (%lld) failed: 0x%016llx\n", fn, err); > +} > + > static __always_inline int sc_retry_prerr(sc_func_t func, > sc_err_func_t err_func, > u64 fn, struct tdx_module_args *args) > @@ -76,4 +100,7 @@ static __always_inline int sc_retry_prerr(sc_func_t func, > #define seamcall_prerr_ret(__fn, __args) \ > sc_retry_prerr(__seamcall_ret, seamcall_err_ret, (__fn), (__args)) > > +#define seamldr_prerr(__fn, __args) \ > + sc_retry_prerr(__seamcall, seamldr_err, (__fn), (__args)) > + > #endif