[RFC 3/9] RISC-V: KVM: Define a probe function for SBI extension data structures

[Atish Patra]

c,urrently the probe function just check if an SBI extension is
registered or not. However, the extension may not want to advertise
itself depending on some other condition.
An additional extension specific probe function will allow
extensions to decide if they want to be advertised to the caller or
not. Any extension that do not require additional dependency check
does not required to implement this function.

Signed-off-by: Atish Patra <atishp at rivosinc.com>
---
 arch/riscv/include/asm/kvm_vcpu_sbi.h |  3 +++
 arch/riscv/kvm/vcpu_sbi_base.c        | 13 +++++++++++--
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/include/asm/kvm_vcpu_sbi.h b/arch/riscv/include/asm/kvm_vcpu_sbi.h
index 83d6d4d2b1df..5853a1ef71ea 100644
--- a/arch/riscv/include/asm/kvm_vcpu_sbi.h
+++ b/arch/riscv/include/asm/kvm_vcpu_sbi.h
@@ -25,6 +25,9 @@ struct kvm_vcpu_sbi_extension {
 	int (*handler)(struct kvm_vcpu *vcpu, struct kvm_run *run,
 		       unsigned long *out_val, struct kvm_cpu_trap *utrap,
 		       bool *exit);
+
+	/* Extension specific probe function */
+	unsigned long (*probe)(unsigned long extid);
 };
 
 void kvm_riscv_vcpu_sbi_forward(struct kvm_vcpu *vcpu, struct kvm_run *run);
diff --git a/arch/riscv/kvm/vcpu_sbi_base.c b/arch/riscv/kvm/vcpu_sbi_base.c
index 48f431091cdb..14be1a819588 100644
--- a/arch/riscv/kvm/vcpu_sbi_base.c
+++ b/arch/riscv/kvm/vcpu_sbi_base.c
@@ -22,6 +22,7 @@ static int kvm_sbi_ext_base_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
 	int ret = 0;
 	struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
 	struct sbiret ecall_ret;
+	const struct kvm_vcpu_sbi_extension *sbi_ext;
 
 	switch (cp->a6) {
 	case SBI_EXT_BASE_GET_SPEC_VERSION:
@@ -46,8 +47,16 @@ static int kvm_sbi_ext_base_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
 			 */
 			kvm_riscv_vcpu_sbi_forward(vcpu, run);
 			*exit = true;
-		} else
-			*out_val = kvm_vcpu_sbi_find_ext(cp->a0) ? 1 : 0;
+		} else {
+			sbi_ext = kvm_vcpu_sbi_find_ext(cp->a0);
+			if (sbi_ext) {
+				if (sbi_ext->probe)
+					*out_val = sbi_ext->probe(cp->a0);
+				else
+					*out_val = 1;
+			} else
+				*out_val = 0;
+		}
 		break;
 	case SBI_EXT_BASE_GET_MVENDORID:
 	case SBI_EXT_BASE_GET_MARCHID:
-- 
2.25.1