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From: Andrew Jones <ajones@ventanamicro.com>
To: kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org,
	virtualization@lists.linux-foundation.org
Cc: anup@brainfault.org, atishp@atishpatra.org, pbonzini@redhat.com,
	paul.walmsley@sifive.com, palmer@dabbelt.com,
	aou@eecs.berkeley.edu, jgross@suse.com, srivatsa@csail.mit.edu,
	guoren@kernel.org, conor.dooley@microchip.com,
	Atish Patra <atishp@rivosinc.com>
Subject: [PATCH v4 05/13] RISC-V: KVM: Add steal-update vcpu request
Date: Wed, 20 Dec 2023 17:00:18 +0100	[thread overview]
Message-ID: <20231220160012.40184-20-ajones@ventanamicro.com> (raw)
In-Reply-To: <20231220160012.40184-15-ajones@ventanamicro.com>

Add a new vcpu request to inform a vcpu that it should record its
steal-time information. The request is made each time it has been
detected that the vcpu task was not assigned a cpu for some time,
which is easy to do by making the request from vcpu-load. The record
function is just a stub for now and will be filled in with the rest
of the steal-time support functions in following patches.

Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
---
 arch/riscv/include/asm/kvm_host.h | 3 +++
 arch/riscv/kvm/vcpu.c             | 5 +++++
 arch/riscv/kvm/vcpu_sbi_sta.c     | 4 ++++
 3 files changed, 12 insertions(+)

diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h
index 0eefd9c991ae..230b82c3118d 100644
--- a/arch/riscv/include/asm/kvm_host.h
+++ b/arch/riscv/include/asm/kvm_host.h
@@ -41,6 +41,7 @@
 	KVM_ARCH_REQ_FLAGS(4, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
 #define KVM_REQ_HFENCE			\
 	KVM_ARCH_REQ_FLAGS(5, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
+#define KVM_REQ_STEAL_UPDATE		KVM_ARCH_REQ(6)
 
 enum kvm_riscv_hfence_type {
 	KVM_RISCV_HFENCE_UNKNOWN = 0,
@@ -372,4 +373,6 @@ bool kvm_riscv_vcpu_has_interrupts(struct kvm_vcpu *vcpu, u64 mask);
 void kvm_riscv_vcpu_power_off(struct kvm_vcpu *vcpu);
 void kvm_riscv_vcpu_power_on(struct kvm_vcpu *vcpu);
 
+void kvm_riscv_vcpu_record_steal_time(struct kvm_vcpu *vcpu);
+
 #endif /* __RISCV_KVM_HOST_H__ */
diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
index bf3952d1a621..6995b8b641e4 100644
--- a/arch/riscv/kvm/vcpu.c
+++ b/arch/riscv/kvm/vcpu.c
@@ -541,6 +541,8 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 
 	kvm_riscv_vcpu_aia_load(vcpu, cpu);
 
+	kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
+
 	vcpu->cpu = cpu;
 }
 
@@ -614,6 +616,9 @@ static void kvm_riscv_check_vcpu_requests(struct kvm_vcpu *vcpu)
 
 		if (kvm_check_request(KVM_REQ_HFENCE, vcpu))
 			kvm_riscv_hfence_process(vcpu);
+
+		if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu))
+			kvm_riscv_vcpu_record_steal_time(vcpu);
 	}
 }
 
diff --git a/arch/riscv/kvm/vcpu_sbi_sta.c b/arch/riscv/kvm/vcpu_sbi_sta.c
index 839911dcd837..e28351c9488b 100644
--- a/arch/riscv/kvm/vcpu_sbi_sta.c
+++ b/arch/riscv/kvm/vcpu_sbi_sta.c
@@ -8,6 +8,10 @@
 #include <asm/kvm_vcpu_sbi.h>
 #include <asm/sbi.h>
 
+void kvm_riscv_vcpu_record_steal_time(struct kvm_vcpu *vcpu)
+{
+}
+
 static int kvm_sbi_sta_steal_time_set_shmem(struct kvm_vcpu *vcpu)
 {
 	return SBI_ERR_FAILURE;
-- 
2.43.0


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linux-riscv@lists.infradead.org
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WARNING: multiple messages have this Message-ID (diff)
From: Andrew Jones <ajones@ventanamicro.com>
To: kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org,
	virtualization@lists.linux-foundation.org
Cc: anup@brainfault.org, atishp@atishpatra.org, pbonzini@redhat.com,
	paul.walmsley@sifive.com, palmer@dabbelt.com,
	aou@eecs.berkeley.edu, jgross@suse.com, srivatsa@csail.mit.edu,
	guoren@kernel.org, conor.dooley@microchip.com,
	Atish Patra <atishp@rivosinc.com>
Subject: [PATCH v4 05/13] RISC-V: KVM: Add steal-update vcpu request
Date: Wed, 20 Dec 2023 17:00:18 +0100	[thread overview]
Message-ID: <20231220160012.40184-20-ajones@ventanamicro.com> (raw)
In-Reply-To: <20231220160012.40184-15-ajones@ventanamicro.com>

Add a new vcpu request to inform a vcpu that it should record its
steal-time information. The request is made each time it has been
detected that the vcpu task was not assigned a cpu for some time,
which is easy to do by making the request from vcpu-load. The record
function is just a stub for now and will be filled in with the rest
of the steal-time support functions in following patches.

Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
---
 arch/riscv/include/asm/kvm_host.h | 3 +++
 arch/riscv/kvm/vcpu.c             | 5 +++++
 arch/riscv/kvm/vcpu_sbi_sta.c     | 4 ++++
 3 files changed, 12 insertions(+)

diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h
index 0eefd9c991ae..230b82c3118d 100644
--- a/arch/riscv/include/asm/kvm_host.h
+++ b/arch/riscv/include/asm/kvm_host.h
@@ -41,6 +41,7 @@
 	KVM_ARCH_REQ_FLAGS(4, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
 #define KVM_REQ_HFENCE			\
 	KVM_ARCH_REQ_FLAGS(5, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
+#define KVM_REQ_STEAL_UPDATE		KVM_ARCH_REQ(6)
 
 enum kvm_riscv_hfence_type {
 	KVM_RISCV_HFENCE_UNKNOWN = 0,
@@ -372,4 +373,6 @@ bool kvm_riscv_vcpu_has_interrupts(struct kvm_vcpu *vcpu, u64 mask);
 void kvm_riscv_vcpu_power_off(struct kvm_vcpu *vcpu);
 void kvm_riscv_vcpu_power_on(struct kvm_vcpu *vcpu);
 
+void kvm_riscv_vcpu_record_steal_time(struct kvm_vcpu *vcpu);
+
 #endif /* __RISCV_KVM_HOST_H__ */
diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
index bf3952d1a621..6995b8b641e4 100644
--- a/arch/riscv/kvm/vcpu.c
+++ b/arch/riscv/kvm/vcpu.c
@@ -541,6 +541,8 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 
 	kvm_riscv_vcpu_aia_load(vcpu, cpu);
 
+	kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
+
 	vcpu->cpu = cpu;
 }
 
@@ -614,6 +616,9 @@ static void kvm_riscv_check_vcpu_requests(struct kvm_vcpu *vcpu)
 
 		if (kvm_check_request(KVM_REQ_HFENCE, vcpu))
 			kvm_riscv_hfence_process(vcpu);
+
+		if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu))
+			kvm_riscv_vcpu_record_steal_time(vcpu);
 	}
 }
 
diff --git a/arch/riscv/kvm/vcpu_sbi_sta.c b/arch/riscv/kvm/vcpu_sbi_sta.c
index 839911dcd837..e28351c9488b 100644
--- a/arch/riscv/kvm/vcpu_sbi_sta.c
+++ b/arch/riscv/kvm/vcpu_sbi_sta.c
@@ -8,6 +8,10 @@
 #include <asm/kvm_vcpu_sbi.h>
 #include <asm/sbi.h>
 
+void kvm_riscv_vcpu_record_steal_time(struct kvm_vcpu *vcpu)
+{
+}
+
 static int kvm_sbi_sta_steal_time_set_shmem(struct kvm_vcpu *vcpu)
 {
 	return SBI_ERR_FAILURE;
-- 
2.43.0


  parent reply	other threads:[~2023-12-20 16:00 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-12-20 16:00 [PATCH v4 00/13] RISC-V: Add steal-time support Andrew Jones
2023-12-20 16:00 ` Andrew Jones
2023-12-20 16:00 ` [PATCH v4 01/13] RISC-V: paravirt: Add skeleton for pv-time support Andrew Jones
2023-12-20 16:00   ` Andrew Jones
2023-12-29  0:16   ` Palmer Dabbelt
2023-12-29  0:16     ` Palmer Dabbelt
2023-12-20 16:00 ` [PATCH v4 02/13] RISC-V: Add SBI STA extension definitions Andrew Jones
2023-12-20 16:00   ` Andrew Jones
2023-12-29  0:16   ` Palmer Dabbelt
2023-12-29  0:16     ` Palmer Dabbelt
2023-12-20 16:00 ` [PATCH v4 03/13] RISC-V: paravirt: Implement steal-time support Andrew Jones
2023-12-20 16:00   ` Andrew Jones
2023-12-29  0:16   ` Palmer Dabbelt
2023-12-29  0:16     ` Palmer Dabbelt
2023-12-20 16:00 ` [PATCH v4 04/13] RISC-V: KVM: Add SBI STA extension skeleton Andrew Jones
2023-12-20 16:00   ` Andrew Jones
2023-12-20 16:00 ` Andrew Jones [this message]
2023-12-20 16:00   ` [PATCH v4 05/13] RISC-V: KVM: Add steal-update vcpu request Andrew Jones
2023-12-20 16:00 ` [PATCH v4 06/13] RISC-V: KVM: Add SBI STA info to vcpu_arch Andrew Jones
2023-12-20 16:00   ` Andrew Jones
2023-12-20 16:00 ` [PATCH v4 07/13] RISC-V: KVM: Add support for SBI extension registers Andrew Jones
2023-12-20 16:00   ` Andrew Jones
2023-12-20 16:00 ` [PATCH v4 08/13] RISC-V: KVM: Add support for SBI STA registers Andrew Jones
2023-12-20 16:00   ` Andrew Jones
2023-12-20 16:00 ` [PATCH v4 09/13] RISC-V: KVM: Implement SBI STA extension Andrew Jones
2023-12-20 16:00   ` Andrew Jones
2023-12-20 16:00 ` [PATCH v4 10/13] RISC-V: KVM: selftests: Move sbi_ecall to processor.c Andrew Jones
2023-12-20 16:00   ` Andrew Jones
2023-12-20 16:00 ` [PATCH v4 11/13] RISC-V: KVM: selftests: Add guest_sbi_probe_extension Andrew Jones
2023-12-20 16:00   ` Andrew Jones
2023-12-20 16:00 ` [PATCH v4 12/13] RISC-V: KVM: selftests: Add steal_time test support Andrew Jones
2023-12-20 16:00   ` Andrew Jones
2023-12-20 16:00 ` [PATCH v4 13/13] RISC-V: KVM: selftests: Add get-reg-list test for STA registers Andrew Jones
2023-12-20 16:00   ` Andrew Jones
2023-12-20 16:11 ` [PATCH v4 00/13] RISC-V: Add steal-time support Anup Patel
2023-12-20 16:11   ` Anup Patel
2023-12-29  6:52 ` Anup Patel
2023-12-29  6:52   ` Anup Patel
2024-01-20 21:09 ` patchwork-bot+linux-riscv
2024-01-20 21:09   ` patchwork-bot+linux-riscv

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