[PATCH v4 04/12] RISC-V: add vector crypto extension detection

Heiko Stuebner
2023-07-11T15:39:41Z

From: Heiko Stuebner <heiko.stuebner@vrull.eu>

Add detection for some extensions of the vector-crypto specification:
- Zvkb: Vector Bit-manipulation used in Cryptography
- Zvkg: Vector GCM/GMAC
- Zvknha and Zvknhb: NIST Algorithm Suite
- Zvkns: AES-128, AES-256 Single Round Suite
- Zvksed: ShangMi Algorithm Suite
- Zvksh: ShangMi Algorithm Suite

As their use is very specific and will likely be limited to special places
we expect current code to just pre-encode those instructions, so right now
we don't introduce toolchain requirements.

Signed-off-by: Heiko Stuebner <heiko.stuebner@vrull.eu>
---
arch/riscv/include/asm/hwcap.h | 9 ++++++
arch/riscv/kernel/cpu.c | 8 ++++++
arch/riscv/kernel/cpufeature.c | 50 ++++++++++++++++++++++++++++++++++
3 files changed, 67 insertions(+)

diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
index b80ca6e77088..0f5172fa87b0 100644
--- a/arch/riscv/include/asm/hwcap.h
+++ b/arch/riscv/include/asm/hwcap.h
@@ -64,6 +64,15 @@
#define RISCV_ISA_EXT_ZKSED 51
#define RISCV_ISA_EXT_ZKSH 52
#define RISCV_ISA_EXT_ZKT 53
+#define RISCV_ISA_EXT_ZVBB 54
+#define RISCV_ISA_EXT_ZVBC 55
+#define RISCV_ISA_EXT_ZVKG 56
+#define RISCV_ISA_EXT_ZVKNED 57
+#define RISCV_ISA_EXT_ZVKNHA 58
+#define RISCV_ISA_EXT_ZVKNHB 59
+#define RISCV_ISA_EXT_ZVKSED 60
+#define RISCV_ISA_EXT_ZVKSH 61
+#define RISCV_ISA_EXT_ZVKT 62

#define RISCV_ISA_EXT_MAX 64
#define RISCV_ISA_EXT_NAME_LEN_MAX 32
diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
index 10524322a4c0..925241e25db2 100644
--- a/arch/riscv/kernel/cpu.c
+++ b/arch/riscv/kernel/cpu.c
@@ -227,6 +227,14 @@ static struct riscv_isa_ext_data isa_ext_arr[] = {
__RISCV_ISA_EXT_DATA(zksed, RISCV_ISA_EXT_ZKSED),
__RISCV_ISA_EXT_DATA(zksh, RISCV_ISA_EXT_ZKSH),
__RISCV_ISA_EXT_DATA(zkt, RISCV_ISA_EXT_ZKT),
+ __RISCV_ISA_EXT_DATA(zvbb, RISCV_ISA_EXT_ZVBB),
+ __RISCV_ISA_EXT_DATA(zvbc, RISCV_ISA_EXT_ZVBC),
+ __RISCV_ISA_EXT_DATA(zvkg, RISCV_ISA_EXT_ZVKG),
+ __RISCV_ISA_EXT_DATA(zvkned, RISCV_ISA_EXT_ZVKNED),
+ __RISCV_ISA_EXT_DATA(zvknha, RISCV_ISA_EXT_ZVKNHA),
+ __RISCV_ISA_EXT_DATA(zvknhb, RISCV_ISA_EXT_ZVKNHB),
+ __RISCV_ISA_EXT_DATA(zvksed, RISCV_ISA_EXT_ZVKSED),
+ __RISCV_ISA_EXT_DATA(zvksh, RISCV_ISA_EXT_ZVKSH),
__RISCV_ISA_EXT_DATA(smaia, RISCV_ISA_EXT_SMAIA),
__RISCV_ISA_EXT_DATA(ssaia, RISCV_ISA_EXT_SSAIA),
__RISCV_ISA_EXT_DATA(sscofpmf, RISCV_ISA_EXT_SSCOFPMF),
diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index 9a872a2007a5..13556fd16bf6 100644
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -343,6 +343,56 @@ void __init riscv_fill_hwcap(void)
SET_ISA_EXT_MAP("zksh", RISCV_ISA_EXT_ZKSH);
SET_ISA_EXT_MAP("zkr", RISCV_ISA_EXT_ZKR);
SET_ISA_EXT_MAP("zkt", RISCV_ISA_EXT_ZKT);
+ SET_ISA_EXT_MAP("zvbb", RISCV_ISA_EXT_ZVBB);
+ SET_ISA_EXT_MAP("zvbc", RISCV_ISA_EXT_ZVBC);
+ SET_ISA_EXT_MAP("zvkg", RISCV_ISA_EXT_ZVKG);
+ SET_ISA_EXT_MAP("zvkned", RISCV_ISA_EXT_ZVKNED);
+ SET_ISA_EXT_MAP("zvknha", RISCV_ISA_EXT_ZVKNHA);
+ SET_ISA_EXT_MAP("zvknhb", RISCV_ISA_EXT_ZVKNHB);
+ SET_ISA_EXT_MAP("zvksed", RISCV_ISA_EXT_ZVKSED);
+ SET_ISA_EXT_MAP("zvksh", RISCV_ISA_EXT_ZVKSH);
+ SET_ISA_EXT_MAP("zvkt", RISCV_ISA_EXT_ZVKT);
+
+ /* NIST Algorithm Suite */
+ SET_ISA_EXT_MAP("zvkn", RISCV_ISA_EXT_ZVKNED);
+ SET_ISA_EXT_MAP("zvkn", RISCV_ISA_EXT_ZVKNHB);
+ SET_ISA_EXT_MAP("zvkn", RISCV_ISA_EXT_ZVBB);
+ SET_ISA_EXT_MAP("zvkn", RISCV_ISA_EXT_ZVKT);
+
+ /* NIST Algorithm Suite with carryless multiply */
+ SET_ISA_EXT_MAP("zvknc", RISCV_ISA_EXT_ZVKNED);
+ SET_ISA_EXT_MAP("zvknc", RISCV_ISA_EXT_ZVKNHB);
+ SET_ISA_EXT_MAP("zvknc", RISCV_ISA_EXT_ZVBB);
+ SET_ISA_EXT_MAP("zvknc", RISCV_ISA_EXT_ZVKT);
+ SET_ISA_EXT_MAP("zvknc", RISCV_ISA_EXT_ZVBC);
+
+ /* NIST Algorithm Suite with GCM */
+ SET_ISA_EXT_MAP("zvkng", RISCV_ISA_EXT_ZVKNED);
+ SET_ISA_EXT_MAP("zvkng", RISCV_ISA_EXT_ZVKNHB);
+ SET_ISA_EXT_MAP("zvkng", RISCV_ISA_EXT_ZVBB);
+ SET_ISA_EXT_MAP("zvkng", RISCV_ISA_EXT_ZVKT);
+ SET_ISA_EXT_MAP("zvkng", RISCV_ISA_EXT_ZVKG);
+
+ /* ShangMi Algorithm Suite */
+ SET_ISA_EXT_MAP("zvks", RISCV_ISA_EXT_ZVKSED);
+ SET_ISA_EXT_MAP("zvks", RISCV_ISA_EXT_ZVKSH);
+ SET_ISA_EXT_MAP("zvks", RISCV_ISA_EXT_ZVBB);
+ SET_ISA_EXT_MAP("zvks", RISCV_ISA_EXT_ZVKT);
+
+ /* ShangMi Algorithm Suite with carryless multiply */
+ SET_ISA_EXT_MAP("zvksc", RISCV_ISA_EXT_ZVKSED);
+ SET_ISA_EXT_MAP("zvksc", RISCV_ISA_EXT_ZVKSH);
+ SET_ISA_EXT_MAP("zvksc", RISCV_ISA_EXT_ZVBB);
+ SET_ISA_EXT_MAP("zvksc", RISCV_ISA_EXT_ZVKT);
+ SET_ISA_EXT_MAP("zvksc", RISCV_ISA_EXT_ZVBC);
+
+ /* ShangMi Algorithm Suite with GCM */
+ SET_ISA_EXT_MAP("zvksg", RISCV_ISA_EXT_ZVKSED);
+ SET_ISA_EXT_MAP("zvksg", RISCV_ISA_EXT_ZVKSH);
+ SET_ISA_EXT_MAP("zvksg", RISCV_ISA_EXT_ZVBB);
+ SET_ISA_EXT_MAP("zvksg", RISCV_ISA_EXT_ZVKT);
+ SET_ISA_EXT_MAP("zvksg", RISCV_ISA_EXT_ZVKG);
+
}
#undef SET_ISA_EXT_MAP
}
--
2.39.2