diff options
author | Andrew Jones <ajones@ventanamicro.com> | 2023-12-20 19:00:18 +0300 |
---|---|---|
committer | Tan En De <ende.tan@starfivetech.com> | 2024-05-22 18:31:49 +0300 |
commit | 9174d85e8dc8e8c71bcd8d39180213b5cb1ad131 (patch) | |
tree | e253435aee7ec142049d486450b980ea8a1582b9 | |
parent | 87100f8c41d40f32b6a68437de528dcfe2abdd79 (diff) | |
download | linux-9174d85e8dc8e8c71bcd8d39180213b5cb1ad131.tar.xz |
RISC-V: KVM: Add steal-update vcpu request
[ Upstream commit 2a1f6bf079700f0f9d8045ab77b302aeb4d12c06 ]
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>
Signed-off-by: Anup Patel <anup@brainfault.org>
-rw-r--r-- | arch/riscv/include/asm/kvm_host.h | 3 | ||||
-rw-r--r-- | arch/riscv/kvm/vcpu.c | 5 | ||||
-rw-r--r-- | arch/riscv/kvm/vcpu_sbi_sta.c | 4 |
3 files changed, 12 insertions, 0 deletions
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 481bb210cbca..928296cf87ac 100644 --- a/arch/riscv/kvm/vcpu.c +++ b/arch/riscv/kvm/vcpu.c @@ -546,6 +546,8 @@ 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; } @@ -619,6 +621,9 @@ 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; |