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From: Atish Patra <atishp@rivosinc.com>
To: linux-kernel@vger.kernel.org
Cc: Atish Patra <atishp@rivosinc.com>,
	Anup Patel <anup@brainfault.org>,
	Andrew Jones <ajones@ventanamicro.com>,
	Atish Patra <atishp@atishpatra.org>, Guo Ren <guoren@kernel.org>,
	kvm-riscv@lists.infradead.org, kvm@vger.kernel.org,
	linux-riscv@lists.infradead.org,
	Mark Rutland <mark.rutland@arm.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Sergey Matyukevich <sergey.matyukevich@syntacore.com>,
	Eric Lin <eric.lin@sifive.com>, Will Deacon <will@kernel.org>
Subject: [PATCH v2 02/11] RISC-V: KVM: Define a probe function for SBI extension data structures
Date: Thu, 15 Dec 2022 09:00:37 -0800	[thread overview]
Message-ID: <20221215170046.2010255-3-atishp@rivosinc.com> (raw)
In-Reply-To: <20221215170046.2010255-1-atishp@rivosinc.com>

Currently the probe function just checks 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 does not require additional dependency checks
can avoid implementing this function.

Signed-off-by: Atish Patra <atishp@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 f79478a..61dac1b 100644
--- a/arch/riscv/include/asm/kvm_vcpu_sbi.h
+++ b/arch/riscv/include/asm/kvm_vcpu_sbi.h
@@ -29,6 +29,9 @@ 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)(struct kvm_vcpu *vcpu, 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 5d65c63..89e2415 100644
--- a/arch/riscv/kvm/vcpu_sbi_base.c
+++ b/arch/riscv/kvm/vcpu_sbi_base.c
@@ -19,6 +19,7 @@ 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;
+	const struct kvm_vcpu_sbi_extension *sbi_ext;
 
 	switch (cp->a6) {
 	case SBI_EXT_BASE_GET_SPEC_VERSION:
@@ -43,8 +44,16 @@ 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(vcpu, cp->a0);
+				else
+					*out_val = 1;
+			} else
+				*out_val = 0;
+		}
 		break;
 	case SBI_EXT_BASE_GET_MVENDORID:
 		*out_val = vcpu->arch.mvendorid;
-- 
2.25.1


  parent reply	other threads:[~2022-12-15 17:01 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-12-15 17:00 [PATCH v2 00/11] KVM perf support Atish Patra
2022-12-15 17:00 ` [PATCH v2 01/11] RISC-V: Define helper functions expose hpm counter width and count Atish Patra
2023-01-12 10:06   ` Andrew Jones
2023-01-12 18:18     ` Atish Kumar Patra
2023-01-13  7:22       ` Andrew Jones
2023-01-24 20:41         ` Atish Patra
2022-12-15 17:00 ` Atish Patra [this message]
2023-01-12 10:21   ` [PATCH v2 02/11] RISC-V: KVM: Define a probe function for SBI extension data structures Andrew Jones
2023-01-12 18:19     ` Atish Kumar Patra
2022-12-15 17:00 ` [PATCH v2 03/11] RISC-V: KVM: Return correct code for hsm stop function Atish Patra
2023-01-12 10:28   ` Andrew Jones
2023-01-12 18:25     ` Atish Kumar Patra
2023-01-13  7:25       ` Andrew Jones
2022-12-15 17:00 ` [PATCH v2 04/11] RISC-V: KVM: Modify SBI extension handler to return SBI error code Atish Patra
2023-01-12 11:04   ` Andrew Jones
2023-01-12 18:47     ` Atish Kumar Patra
2023-01-13  7:42       ` Andrew Jones
2022-12-15 17:00 ` [PATCH v2 05/11] RISC-V: KVM: Improve privilege mode filtering for perf Atish Patra
2022-12-15 20:17   ` Conor Dooley
2022-12-15 21:10     ` Atish Kumar Patra
2022-12-15 17:00 ` [PATCH v2 06/11] RISC-V: KVM: Add skeleton support " Atish Patra
2023-01-12 15:10   ` Andrew Jones
2023-01-12 18:09     ` Atish Kumar Patra
2022-12-15 17:00 ` [PATCH v2 07/11] RISC-V: KVM: Add SBI PMU extension support Atish Patra
2023-01-12 15:29   ` Andrew Jones
2023-01-12 18:04     ` Atish Kumar Patra
2022-12-15 17:00 ` [PATCH v2 08/11] RISC-V: KVM: Disable all hpmcounter access for VS/VU mode Atish Patra
2023-01-12 15:47   ` Andrew Jones
2022-12-15 17:00 ` [PATCH v2 09/11] RISC-V: KVM: Implement trap & emulate for hpmcounters Atish Patra
2023-01-13 11:47   ` Andrew Jones
2022-12-15 17:00 ` [PATCH v2 10/11] RISC-V: KVM: Implement perf support without sampling Atish Patra
2023-01-13 11:45   ` Andrew Jones
2023-01-23  7:23     ` Andrew Jones
2023-01-26  0:50     ` Atish Patra
2022-12-15 17:00 ` [PATCH v2 11/11] RISC-V: KVM: Implement firmware events Atish Patra
2023-01-13 12:08   ` Andrew Jones
2023-01-26  3:08     ` Atish Patra

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