Add struct rsi_host_call to rsi_smc.h, which represents the host call data structure used by the Realm Management Monitor (RMM) for the RSI_HOST_CALL interface. The structure contains a 16-bit immediate field and 31 general-purpose register values, aligned to 256 bytes as required by the CCA RMM specification.
Add rsi_host_call() static inline wrapper in rsi_cmds.h that invokes SMC_RSI_HOST_CALL with the physical address of the host call structure. This will be used by Hyper-V guest code to route hypercalls through the RSI interface when running inside an Arm CCA Realm. Signed-off-by: Kameron Carr <[email protected]> --- arch/arm64/include/asm/rsi_cmds.h | 9 +++++++++ arch/arm64/include/asm/rsi_smc.h | 6 ++++++ 2 files changed, 15 insertions(+) diff --git a/arch/arm64/include/asm/rsi_cmds.h b/arch/arm64/include/asm/rsi_cmds.h index 2c8763876dfb7..83b4b1f598454 100644 --- a/arch/arm64/include/asm/rsi_cmds.h +++ b/arch/arm64/include/asm/rsi_cmds.h @@ -159,4 +159,13 @@ static inline unsigned long rsi_attestation_token_continue(phys_addr_t granule, return res.a0; } +static inline long rsi_host_call(phys_addr_t host_call_struct) +{ + struct arm_smccc_res res; + + arm_smccc_smc(SMC_RSI_HOST_CALL, host_call_struct, 0, 0, 0, 0, 0, 0, + &res); + return res.a0; +} + #endif /* __ASM_RSI_CMDS_H */ diff --git a/arch/arm64/include/asm/rsi_smc.h b/arch/arm64/include/asm/rsi_smc.h index e19253f96c940..ffea93340ed7f 100644 --- a/arch/arm64/include/asm/rsi_smc.h +++ b/arch/arm64/include/asm/rsi_smc.h @@ -142,6 +142,12 @@ struct realm_config { */ } __aligned(0x1000); +struct rsi_host_call { + u16 immediate; + u64 gprs[31]; +} __aligned(256); +static_assert(sizeof(struct rsi_host_call) == 256); + #endif /* __ASSEMBLER__ */ /* -- 2.45.4
