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| author | Bibo Mao <maobibo@loongson.cn> | 2024-03-06 09:12:13 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2024-03-06 09:12:13 +0800 |
| commit | f66228053e429bd926505c447d3af2d3d610ed92 (patch) | |
| tree | 59e66a290de2ff084a70c298b0b039c54675df68 /arch/loongarch/kvm | |
| parent | 8bc15d02d5fdff31bfeca02e58e22e26880dde39 (diff) | |
| download | linux-stable-f66228053e429bd926505c447d3af2d3d610ed92.tar.gz linux-stable-f66228053e429bd926505c447d3af2d3d610ed92.tar.bz2 linux-stable-f66228053e429bd926505c447d3af2d3d610ed92.zip | |
LoongArch: KVM: Do not restart SW timer when it is expired
LoongArch VCPUs have their own separate HW timers. SW timer is to wake
up blocked vcpu thread, rather than HW timer emulation. When blocking
vcpu scheduled out, SW timer is used to wakeup blocked vcpu thread and
injects timer interrupt. It does not care about whether guest timer is
in period mode or oneshot mode, and SW timer needs not to be restarted
since vcpu has been woken.
This patch does not restart SW timer when it is expired.
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/kvm')
| -rw-r--r-- | arch/loongarch/kvm/timer.c | 20 |
1 files changed, 1 insertions, 19 deletions
diff --git a/arch/loongarch/kvm/timer.c b/arch/loongarch/kvm/timer.c index b0dafe0611ab..bcc6b6d063d9 100644 --- a/arch/loongarch/kvm/timer.c +++ b/arch/loongarch/kvm/timer.c @@ -23,24 +23,6 @@ static inline u64 tick_to_ns(struct kvm_vcpu *vcpu, u64 tick) return div_u64(tick * MNSEC_PER_SEC, vcpu->arch.timer_mhz); } -/* - * Push timer forward on timeout. - * Handle an hrtimer event by push the hrtimer forward a period. - */ -static enum hrtimer_restart kvm_count_timeout(struct kvm_vcpu *vcpu) -{ - unsigned long cfg, period; - - /* Add periodic tick to current expire time */ - cfg = kvm_read_sw_gcsr(vcpu->arch.csr, LOONGARCH_CSR_TCFG); - if (cfg & CSR_TCFG_PERIOD) { - period = tick_to_ns(vcpu, cfg & CSR_TCFG_VAL); - hrtimer_add_expires_ns(&vcpu->arch.swtimer, period); - return HRTIMER_RESTART; - } else - return HRTIMER_NORESTART; -} - /* Low level hrtimer wake routine */ enum hrtimer_restart kvm_swtimer_wakeup(struct hrtimer *timer) { @@ -50,7 +32,7 @@ enum hrtimer_restart kvm_swtimer_wakeup(struct hrtimer *timer) kvm_queue_irq(vcpu, INT_TI); rcuwait_wake_up(&vcpu->wait); - return kvm_count_timeout(vcpu); + return HRTIMER_NORESTART; } /* |