Add Zilsd/Zclsd support in hwprobe and KVM

Documentation/arch/riscv/hwprobe.rst

@@ -281,6 +281,14 @@ The following keys are defined:
   * :c:macro:`RISCV_HWPROBE_EXT_ZICBOP`: The Zicbop extension is supported, as
        ratified in commit 3dd606f ("Create cmobase-v1.0.pdf") of riscv-CMOs.
 
+  * :c:macro:`RISCV_HWPROBE_EXT_ZILSD`: The Zilsd extension is supported as
+       defined in the RISC-V ISA manual starting from commit f88abf1 ("Integrating
+       load/store pair for RV32 with the main manual") of the riscv-isa-manual.
+
+  * :c:macro:`RISCV_HWPROBE_EXT_ZCLSD`: The Zclsd extension is supported as
+       defined in the RISC-V ISA manual starting from commit f88abf1 ("Integrating
+       load/store pair for RV32 with the main manual") of the riscv-isa-manual.
+
 * :c:macro:`RISCV_HWPROBE_KEY_CPUPERF_0`: A bitmask that contains performance
   information about the selected set of processors.
 * :c:macro:`RISCV_HWPROBE_KEY_CPUPERF_0`: Deprecated.  Returns similar values to

Documentation/devicetree/bindings/riscv/extensions.yaml

@@ -240,6 +240,20 @@ properties:
             ratified in the 20191213 version of the unprivileged ISA
             specification.
 
+        - const: zilsd
+          description:
+            The standard Zilsd extension which provides support for aligned
+            register-pair load and store operations in 32-bit instruction
+            encodings, as ratified in commit f88abf1 ("Integrating
+            load/store pair for RV32 with the main manual") of riscv-isa-manual.
+
+        - const: zclsd
+          description:
+            The Zclsd extension implements the compressed (16-bit) version of the
+            Load/Store Pair for RV32. As with Zilsd, this extension was ratified
+            in commit f88abf1 ("Integrating load/store pair for RV32 with the
+            main manual") of riscv-isa-manual.
+
         - const: zihintpause
           description:
             The standard Zihintpause extension for pause hints, as ratified in

arch/riscv/include/asm/hwcap.h

@@ -108,6 +108,8 @@
 #define RISCV_ISA_EXT_ZALRSC		99
 #define RISCV_ISA_EXT_ZICBOP            100
 #define RISCV_ISA_EXT_ZALASR		101
+#define RISCV_ISA_EXT_ZILSD		102
+#define RISCV_ISA_EXT_ZCLSD		103
 
 #define RISCV_ISA_EXT_XLINUXENVCFG	127
 

arch/riscv/include/uapi/asm/hwprobe.h

@@ -84,6 +84,9 @@ struct riscv_hwprobe {
 #define		RISCV_HWPROBE_EXT_ZABHA		(1ULL << 58)
 #define		RISCV_HWPROBE_EXT_ZALASR	(1ULL << 59)
 #define		RISCV_HWPROBE_EXT_ZICBOP	(1ULL << 60)
+#define		RISCV_HWPROBE_EXT_ZILSD		(1ULL << 61)
+#define		RISCV_HWPROBE_EXT_ZCLSD		(1ULL << 62)
+
 #define RISCV_HWPROBE_KEY_CPUPERF_0	5
 #define		RISCV_HWPROBE_MISALIGNED_UNKNOWN	(0 << 0)
 #define		RISCV_HWPROBE_MISALIGNED_EMULATED	(1 << 0)

arch/riscv/include/uapi/asm/kvm.h

@@ -191,6 +191,8 @@ enum KVM_RISCV_ISA_EXT_ID {
 	KVM_RISCV_ISA_EXT_ZVFBFMIN,
 	KVM_RISCV_ISA_EXT_ZVFBFWMA,
 	KVM_RISCV_ISA_EXT_ZALASR,
+	KVM_RISCV_ISA_EXT_ZCLSD,
+	KVM_RISCV_ISA_EXT_ZILSD,
 	KVM_RISCV_ISA_EXT_MAX,
 };
 

arch/riscv/kernel/cpufeature.c

@@ -168,6 +168,28 @@ static int riscv_ext_zcf_validate(const struct riscv_isa_ext_data *data,
 	return -EPROBE_DEFER;
 }
 
+static int riscv_ext_zilsd_validate(const struct riscv_isa_ext_data *data,
+				    const unsigned long *isa_bitmap)
+{
+	if (IS_ENABLED(CONFIG_64BIT))
+		return -EINVAL;
+
+	return 0;
+}
+
+static int riscv_ext_zclsd_validate(const struct riscv_isa_ext_data *data,
+				    const unsigned long *isa_bitmap)
+{
+	if (IS_ENABLED(CONFIG_64BIT))
+		return -EINVAL;
+
+	if (__riscv_isa_extension_available(isa_bitmap, RISCV_ISA_EXT_ZILSD) &&
+	    __riscv_isa_extension_available(isa_bitmap, RISCV_ISA_EXT_ZCA))
+		return 0;
+
+	return -EPROBE_DEFER;
+}
+
 static int riscv_vector_f_validate(const struct riscv_isa_ext_data *data,
 				   const unsigned long *isa_bitmap)
 {
@@ -412,6 +434,8 @@ const struct riscv_isa_ext_data riscv_isa_ext[] = {
 	__RISCV_ISA_EXT_DATA_VALIDATE(zcd, RISCV_ISA_EXT_ZCD, riscv_ext_zcd_validate),
 	__RISCV_ISA_EXT_DATA_VALIDATE(zcf, RISCV_ISA_EXT_ZCF, riscv_ext_zcf_validate),
 	__RISCV_ISA_EXT_DATA_VALIDATE(zcmop, RISCV_ISA_EXT_ZCMOP, riscv_ext_zca_depends),
+	__RISCV_ISA_EXT_DATA_VALIDATE(zclsd, RISCV_ISA_EXT_ZCLSD, riscv_ext_zclsd_validate),
+	__RISCV_ISA_EXT_DATA_VALIDATE(zilsd, RISCV_ISA_EXT_ZILSD, riscv_ext_zilsd_validate),
 	__RISCV_ISA_EXT_DATA(zba, RISCV_ISA_EXT_ZBA),
 	__RISCV_ISA_EXT_DATA(zbb, RISCV_ISA_EXT_ZBB),
 	__RISCV_ISA_EXT_DATA(zbc, RISCV_ISA_EXT_ZBC),

arch/riscv/kernel/sys_hwprobe.c

@@ -112,6 +112,7 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
 		EXT_KEY(ZBS);
 		EXT_KEY(ZCA);
 		EXT_KEY(ZCB);
+		EXT_KEY(ZCLSD);
 		EXT_KEY(ZCMOP);
 		EXT_KEY(ZICBOM);
 		EXT_KEY(ZICBOP);
@@ -121,6 +122,7 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
 		EXT_KEY(ZIHINTNTL);
 		EXT_KEY(ZIHINTPAUSE);
 		EXT_KEY(ZIHPM);
+		EXT_KEY(ZILSD);
 		EXT_KEY(ZIMOP);
 		EXT_KEY(ZKND);
 		EXT_KEY(ZKNE);

arch/riscv/kvm/vcpu_onereg.c

@@ -64,6 +64,7 @@ static const unsigned long kvm_isa_ext_arr[] = {
 	KVM_ISA_EXT_ARR(ZCB),
 	KVM_ISA_EXT_ARR(ZCD),
 	KVM_ISA_EXT_ARR(ZCF),
+	KVM_ISA_EXT_ARR(ZCLSD),
 	KVM_ISA_EXT_ARR(ZCMOP),
 	KVM_ISA_EXT_ARR(ZFA),
 	KVM_ISA_EXT_ARR(ZFBFMIN),
@@ -80,6 +81,7 @@ static const unsigned long kvm_isa_ext_arr[] = {
 	KVM_ISA_EXT_ARR(ZIHINTNTL),
 	KVM_ISA_EXT_ARR(ZIHINTPAUSE),
 	KVM_ISA_EXT_ARR(ZIHPM),
+	KVM_ISA_EXT_ARR(ZILSD),
 	KVM_ISA_EXT_ARR(ZIMOP),
 	KVM_ISA_EXT_ARR(ZKND),
 	KVM_ISA_EXT_ARR(ZKNE),

tools/testing/selftests/kvm/riscv/get-reg-list.c

@@ -56,6 +56,7 @@ bool filter_reg(__u64 reg)
 	case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_ZBKC:
 	case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_ZBKX:
 	case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_ZBS:
+	case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_ZCLSD:
 	case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_ZFA:
 	case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_ZFH:
 	case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_ZFHMIN:
@@ -69,6 +70,7 @@ bool filter_reg(__u64 reg)
 	case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_ZIHINTNTL:
 	case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_ZIHINTPAUSE:
 	case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_ZIHPM:
+	case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_ZILSD:
 	case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_ZKND:
 	case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_ZKNE:
 	case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_ZKNH:
@@ -399,6 +401,7 @@ static const char *isa_ext_id_to_str(const char *prefix, __u64 id)
 		KVM_ISA_EXT_ARR(ZBA),
 		KVM_ISA_EXT_ARR(ZBB),
 		KVM_ISA_EXT_ARR(ZBS),
+		KVM_ISA_EXT_ARR(ZCLSD),
 		KVM_ISA_EXT_ARR(ZICBOM),
 		KVM_ISA_EXT_ARR(ZICBOP),
 		KVM_ISA_EXT_ARR(ZICBOZ),
@@ -407,6 +410,7 @@ static const char *isa_ext_id_to_str(const char *prefix, __u64 id)
 		KVM_ISA_EXT_ARR(ZIFENCEI),
 		KVM_ISA_EXT_ARR(ZIHINTPAUSE),
 		KVM_ISA_EXT_ARR(ZIHPM),
+		KVM_ISA_EXT_ARR(ZILSD),
 	};
 
 	if (reg_off >= ARRAY_SIZE(kvm_isa_ext_reg_name))
@@ -868,6 +872,7 @@ KVM_ISA_EXT_SIMPLE_CONFIG(svpbmt, SVPBMT);
 KVM_ISA_EXT_SIMPLE_CONFIG(zba, ZBA);
 KVM_ISA_EXT_SIMPLE_CONFIG(zbb, ZBB);
 KVM_ISA_EXT_SIMPLE_CONFIG(zbs, ZBS);
+KVM_ISA_EXT_SIMPLE_CONFIG(zclsd, ZCLSD);
 KVM_ISA_EXT_SUBLIST_CONFIG(zicbom, ZICBOM);
 KVM_ISA_EXT_SUBLIST_CONFIG(zicbop, ZICBOP);
 KVM_ISA_EXT_SUBLIST_CONFIG(zicboz, ZICBOZ);
@@ -877,6 +882,7 @@ KVM_ISA_EXT_SIMPLE_CONFIG(zicsr, ZICSR);
 KVM_ISA_EXT_SIMPLE_CONFIG(zifencei, ZIFENCEI);
 KVM_ISA_EXT_SIMPLE_CONFIG(zihintpause, ZIHINTPAUSE);
 KVM_ISA_EXT_SIMPLE_CONFIG(zihpm, ZIHPM);
+KVM_ISA_EXT_SIMPLE_CONFIG(zilsd, ZILSD);
 
 struct vcpu_reg_list *vcpu_configs[] = {
 	&config_sbi_base,
@@ -897,6 +903,7 @@ struct vcpu_reg_list *vcpu_configs[] = {
 	&config_zba,
 	&config_zbb,
 	&config_zbs,
+	&config_zclsd,
 	&config_zicbom,
 	&config_zicbop,
 	&config_zicboz,
@@ -906,5 +913,6 @@ struct vcpu_reg_list *vcpu_configs[] = {
 	&config_zifencei,
 	&config_zihintpause,
 	&config_zihpm,
+	&config_zilsd,
 };
 int vcpu_configs_n = ARRAY_SIZE(vcpu_configs);