diff options
| -rw-r--r-- | arch/x86/coco/tdx/tdx.c | 37 | ||||
| -rw-r--r-- | arch/x86/include/asm/shared/tdx.h | 1 | ||||
| -rw-r--r-- | arch/x86/include/asm/tdx.h | 2 |
3 files changed, 40 insertions, 0 deletions
diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c index edab6d6049be..0b6804d2a5e1 100644 --- a/arch/x86/coco/tdx/tdx.c +++ b/arch/x86/coco/tdx/tdx.c @@ -36,6 +36,7 @@ /* TDX Module call error codes */ #define TDCALL_RETURN_CODE(a) ((a) >> 32) #define TDCALL_INVALID_OPERAND 0xc0000100 +#define TDCALL_OPERAND_BUSY 0x80000200 #define TDREPORT_SUBTYPE_0 0 @@ -137,6 +138,42 @@ int tdx_mcall_get_report0(u8 *reportdata, u8 *tdreport) EXPORT_SYMBOL_GPL(tdx_mcall_get_report0); /** + * tdx_mcall_extend_rtmr() - Wrapper to extend RTMR registers using + * TDG.MR.RTMR.EXTEND TDCALL. + * @index: Index of RTMR register to be extended. + * @data: Address of the input buffer with RTMR register extend data. + * + * Refer to section titled "TDG.MR.RTMR.EXTEND leaf" in the TDX Module v1.0 + * specification for more information on TDG.MR.RTMR.EXTEND TDCALL. + * + * It is used in the TDX guest driver module to allow user to extend the RTMR + * registers. + * + * Return 0 on success, -ENXIO for invalid operands, -EBUSY for busy operation, + * or -EIO on other TDCALL failures. + */ +int tdx_mcall_extend_rtmr(u8 index, u8 *data) +{ + struct tdx_module_args args = { + .rcx = virt_to_phys(data), + .rdx = index, + }; + u64 ret; + + ret = __tdcall(TDG_MR_RTMR_EXTEND, &args); + if (ret) { + if (TDCALL_RETURN_CODE(ret) == TDCALL_INVALID_OPERAND) + return -ENXIO; + if (TDCALL_RETURN_CODE(ret) == TDCALL_OPERAND_BUSY) + return -EBUSY; + return -EIO; + } + + return 0; +} +EXPORT_SYMBOL_GPL(tdx_mcall_extend_rtmr); + +/** * tdx_hcall_get_quote() - Wrapper to request TD Quote using GetQuote * hypercall. * @buf: Address of the directly mapped shared kernel buffer which diff --git a/arch/x86/include/asm/shared/tdx.h b/arch/x86/include/asm/shared/tdx.h index a28ff6b14145..738f583f65cb 100644 --- a/arch/x86/include/asm/shared/tdx.h +++ b/arch/x86/include/asm/shared/tdx.h @@ -13,6 +13,7 @@ /* TDX module Call Leaf IDs */ #define TDG_VP_VMCALL 0 #define TDG_VP_INFO 1 +#define TDG_MR_RTMR_EXTEND 2 #define TDG_VP_VEINFO_GET 3 #define TDG_MR_REPORT 4 #define TDG_MEM_PAGE_ACCEPT 6 diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h index 4a1922ec80cf..12d17f3ca301 100644 --- a/arch/x86/include/asm/tdx.h +++ b/arch/x86/include/asm/tdx.h @@ -64,6 +64,8 @@ bool tdx_early_handle_ve(struct pt_regs *regs); int tdx_mcall_get_report0(u8 *reportdata, u8 *tdreport); +int tdx_mcall_extend_rtmr(u8 index, u8 *data); + u64 tdx_hcall_get_quote(u8 *buf, size_t size); void __init tdx_dump_attributes(u64 td_attr); |