Commit 2a1f6bf0 authored by Andrew Jones's avatar Andrew Jones Committed by Anup Patel
Browse files

RISC-V: KVM: Add steal-update vcpu request 



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: default avatarAnup Patel <anup@brainfault.org>
Reviewed-by: default avatarAtish Patra <atishp@rivosinc.com>
Signed-off-by: default avatarAndrew Jones <ajones@ventanamicro.com>
Signed-off-by: default avatarAnup Patel <anup@brainfault.org>
parent 5fed84a8

arch/riscv/include/asm/kvm_host.h

+3 −0
Original line number Diff line number Diff line
@@ -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__ */

arch/riscv/kvm/vcpu.c

+5 −0
Original line number Diff line number Diff line
@@ -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);

	}

}

arch/riscv/kvm/vcpu_sbi_sta.c

+4 −0
Original line number Diff line number Diff line
@@ -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;