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RISC-V: KVM: Add SBI STA info to vcpu_arch

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KVM's implementation of SBI STA needs to track the address of each
VCPU's steal-time shared memory region as well as the amount of
stolen time. Add a structure to vcpu_arch to contain this state
and make sure that the address is always set to INVALID_GPA on
vcpu reset. And, of course, ensure KVM won't try to update steal-
time when the shared memory address is invalid.

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>
This commit is contained in:
Andrew Jones 2023-12-20 17:00:19 +01:00 committed by Anup Patel
parent 2a1f6bf079
commit 38b3390ee4
3 changed files with 19 additions and 0 deletions
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7
arch/riscv/include/asm/kvm_host.h
View file

@ -263,6 +263,12 @@ struct kvm_vcpu_arch {
/* 'static' configurations which are set only once */
struct kvm_vcpu_config cfg;
/* SBI steal-time accounting */
struct {
gpa_t shmem;
u64 last_steal;
} sta;
};
static inline void kvm_arch_sync_events(struct kvm *kvm) {}
@ -373,6 +379,7 @@ 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_sbi_sta_reset(struct kvm_vcpu *vcpu);
void kvm_riscv_vcpu_record_steal_time(struct kvm_vcpu *vcpu);
#endif /* __RISCV_KVM_HOST_H__ */

2
arch/riscv/kvm/vcpu.c
View file

@ -83,6 +83,8 @@ static void kvm_riscv_reset_vcpu(struct kvm_vcpu *vcpu)
vcpu->arch.hfence_tail = 0;
memset(vcpu->arch.hfence_queue, 0, sizeof(vcpu->arch.hfence_queue));
kvm_riscv_vcpu_sbi_sta_reset(vcpu);
/* Reset the guest CSRs for hotplug usecase */
if (loaded)
kvm_arch_vcpu_load(vcpu, smp_processor_id());

10
arch/riscv/kvm/vcpu_sbi_sta.c
View file

@ -8,8 +8,18 @@
#include <asm/kvm_vcpu_sbi.h>
#include <asm/sbi.h>
void kvm_riscv_vcpu_sbi_sta_reset(struct kvm_vcpu *vcpu)
{
vcpu->arch.sta.shmem = INVALID_GPA;
vcpu->arch.sta.last_steal = 0;
}
void kvm_riscv_vcpu_record_steal_time(struct kvm_vcpu *vcpu)
{
gpa_t shmem = vcpu->arch.sta.shmem;
if (shmem == INVALID_GPA)
return;
}
static int kvm_sbi_sta_steal_time_set_shmem(struct kvm_vcpu *vcpu)