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| author | Anup Patel <apatel@ventanamicro.com> | 2022-10-21 09:22:45 +0300 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2022-10-21 09:22:45 +0300 |
| commit | cea8896bd936135559253e9b23340cfa1cdf0caf (patch) | |
| tree | a5c94163df10e7c56cab18976231642efd44efa2 /arch/riscv/include | |
| parent | 5c20a3a9df19811051441214e7f5091cb3546db0 (diff) | |
| download | linux-cea8896bd936135559253e9b23340cfa1cdf0caf.tar.xz | |
RISC-V: KVM: Fix kvm_riscv_vcpu_timer_pending() for Sstc
The kvm_riscv_vcpu_timer_pending() checks per-VCPU next_cycles
and per-VCPU software injected VS timer interrupt. This function
returns incorrect value when Sstc is available because the per-VCPU
next_cycles are only updated by kvm_riscv_vcpu_timer_save() called
from kvm_arch_vcpu_put(). As a result, when Sstc is available the
VCPU does not block properly upon WFI traps.
To fix the above issue, we introduce kvm_riscv_vcpu_timer_sync()
which will update per-VCPU next_cycles upon every VM exit instead
of kvm_riscv_vcpu_timer_save().
Fixes: 8f5cb44b1bae ("RISC-V: KVM: Support sstc extension")
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Anup Patel <anup@brainfault.org>
Diffstat (limited to 'arch/riscv/include')
| -rw-r--r-- | arch/riscv/include/asm/kvm_vcpu_timer.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/kvm_vcpu_timer.h b/arch/riscv/include/asm/kvm_vcpu_timer.h index 0d8fdb8ec63a..82f7260301da 100644 --- a/arch/riscv/include/asm/kvm_vcpu_timer.h +++ b/arch/riscv/include/asm/kvm_vcpu_timer.h @@ -45,6 +45,7 @@ int kvm_riscv_vcpu_timer_deinit(struct kvm_vcpu *vcpu); int kvm_riscv_vcpu_timer_reset(struct kvm_vcpu *vcpu); void kvm_riscv_vcpu_timer_restore(struct kvm_vcpu *vcpu); void kvm_riscv_guest_timer_init(struct kvm *kvm); +void kvm_riscv_vcpu_timer_sync(struct kvm_vcpu *vcpu); void kvm_riscv_vcpu_timer_save(struct kvm_vcpu *vcpu); bool kvm_riscv_vcpu_timer_pending(struct kvm_vcpu *vcpu); |