Merge tag 'kvm-riscv-6.9-1' of https://github.com/kvm-riscv/linux into HEAD

KVM/riscv changes for 6.9

- Exception and interrupt handling for selftests
- Sstc (aka arch_timer) selftest
- Forward seed CSR access to KVM userspace
- Ztso extension support for Guest/VM
- Zacas extension support for Guest/VM

Author: bonzini

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

@@ -165,6 +165,8 @@ enum KVM_RISCV_ISA_EXT_ID {
 	KVM_RISCV_ISA_EXT_ZVFH,
 	KVM_RISCV_ISA_EXT_ZVFHMIN,
 	KVM_RISCV_ISA_EXT_ZFA,
+	KVM_RISCV_ISA_EXT_ZTSO,
+	KVM_RISCV_ISA_EXT_ZACAS,
 	KVM_RISCV_ISA_EXT_MAX,
 };
 

arch/riscv/kvm/vcpu_insn.c

@@ -7,6 +7,8 @@
 #include <linux/bitops.h>
 #include <linux/kvm_host.h>
 
+#include <asm/cpufeature.h>
+
 #define INSN_OPCODE_MASK	0x007c
 #define INSN_OPCODE_SHIFT	2
 #define INSN_OPCODE_SYSTEM	28
@@ -213,9 +215,20 @@ struct csr_func {
 		    unsigned long wr_mask);
 };
 
+static int seed_csr_rmw(struct kvm_vcpu *vcpu, unsigned int csr_num,
+			unsigned long *val, unsigned long new_val,
+			unsigned long wr_mask)
+{
+	if (!riscv_isa_extension_available(vcpu->arch.isa, ZKR))
+		return KVM_INSN_ILLEGAL_TRAP;
+
+	return KVM_INSN_EXIT_TO_USER_SPACE;
+}
+
 static const struct csr_func csr_funcs[] = {
 	KVM_RISCV_VCPU_AIA_CSR_FUNCS
 	KVM_RISCV_VCPU_HPMCOUNTER_CSR_FUNCS
+	{ .base = CSR_SEED, .count = 1, .func = seed_csr_rmw },
 };
 
 /**

arch/riscv/kvm/vcpu_onereg.c

@@ -40,6 +40,7 @@ static const unsigned long kvm_isa_ext_arr[] = {
 	KVM_ISA_EXT_ARR(SVINVAL),
 	KVM_ISA_EXT_ARR(SVNAPOT),
 	KVM_ISA_EXT_ARR(SVPBMT),
+	KVM_ISA_EXT_ARR(ZACAS),
 	KVM_ISA_EXT_ARR(ZBA),
 	KVM_ISA_EXT_ARR(ZBB),
 	KVM_ISA_EXT_ARR(ZBC),
@@ -66,6 +67,7 @@ static const unsigned long kvm_isa_ext_arr[] = {
 	KVM_ISA_EXT_ARR(ZKSED),
 	KVM_ISA_EXT_ARR(ZKSH),
 	KVM_ISA_EXT_ARR(ZKT),
+	KVM_ISA_EXT_ARR(ZTSO),
 	KVM_ISA_EXT_ARR(ZVBB),
 	KVM_ISA_EXT_ARR(ZVBC),
 	KVM_ISA_EXT_ARR(ZVFH),
@@ -117,6 +119,7 @@ static bool kvm_riscv_vcpu_isa_disable_allowed(unsigned long ext)
 	case KVM_RISCV_ISA_EXT_SSTC:
 	case KVM_RISCV_ISA_EXT_SVINVAL:
 	case KVM_RISCV_ISA_EXT_SVNAPOT:
+	case KVM_RISCV_ISA_EXT_ZACAS:
 	case KVM_RISCV_ISA_EXT_ZBA:
 	case KVM_RISCV_ISA_EXT_ZBB:
 	case KVM_RISCV_ISA_EXT_ZBC:
@@ -141,6 +144,7 @@ static bool kvm_riscv_vcpu_isa_disable_allowed(unsigned long ext)
 	case KVM_RISCV_ISA_EXT_ZKSED:
 	case KVM_RISCV_ISA_EXT_ZKSH:
 	case KVM_RISCV_ISA_EXT_ZKT:
+	case KVM_RISCV_ISA_EXT_ZTSO:
 	case KVM_RISCV_ISA_EXT_ZVBB:
 	case KVM_RISCV_ISA_EXT_ZVBC:
 	case KVM_RISCV_ISA_EXT_ZVFH: