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Merge branch 'loongarch-kvm' into loongarch-next

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This commit is contained in:
Huacai Chen 2024-03-19 15:51:04 +08:00
commit 18b722527e
3 changed files with 36 additions and 46 deletions
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6
arch/loongarch/kvm/switch.S
View File

@ -214,12 +214,6 @@ SYM_FUNC_START(kvm_enter_guest)
/* Save host GPRs */
kvm_save_host_gpr a2
/* Save host CRMD, PRMD to stack */
csrrd a3, LOONGARCH_CSR_CRMD
st.d a3, a2, PT_CRMD
csrrd a3, LOONGARCH_CSR_PRMD
st.d a3, a2, PT_PRMD
addi.d a2, a1, KVM_VCPU_ARCH
st.d sp, a2, KVM_ARCH_HSP
st.d tp, a2, KVM_ARCH_HTP

43
arch/loongarch/kvm/timer.c
View File

@ -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;
}
/*
@ -93,7 +75,8 @@ void kvm_restore_timer(struct kvm_vcpu *vcpu)
/*
* Freeze the soft-timer and sync the guest stable timer with it.
*/
hrtimer_cancel(&vcpu->arch.swtimer);
if (kvm_vcpu_is_blocking(vcpu))
hrtimer_cancel(&vcpu->arch.swtimer);
/*
* From LoongArch Reference Manual Volume 1 Chapter 7.6.2
@ -168,26 +151,20 @@ static void _kvm_save_timer(struct kvm_vcpu *vcpu)
* Here judge one-shot timer fired by checking whether TVAL is larger
* than TCFG
*/
if (ticks < cfg) {
if (ticks < cfg)
delta = tick_to_ns(vcpu, ticks);
expire = ktime_add_ns(ktime_get(), delta);
vcpu->arch.expire = expire;
else
delta = 0;
expire = ktime_add_ns(ktime_get(), delta);
vcpu->arch.expire = expire;
if (kvm_vcpu_is_blocking(vcpu)) {
/*
* HRTIMER_MODE_PINNED is suggested since vcpu may run in
* the same physical cpu in next time
*/
hrtimer_start(&vcpu->arch.swtimer, expire, HRTIMER_MODE_ABS_PINNED);
} else if (vcpu->stat.generic.blocking) {
/*
* Inject timer interrupt so that halt polling can dectect and exit.
* VCPU is scheduled out already and sleeps in rcuwait queue and
* will not poll pending events again. kvm_queue_irq() is not enough,
* hrtimer swtimer should be used here.
*/
expire = ktime_add_ns(ktime_get(), 10);
vcpu->arch.expire = expire;
hrtimer_start(&vcpu->arch.swtimer, expire, HRTIMER_MODE_ABS_PINNED);
}
}

33
arch/loongarch/kvm/vcpu.c
View File

@ -304,11 +304,18 @@ static int _kvm_get_cpucfg_mask(int id, u64 *v)
return -EINVAL;
switch (id) {
case 2:
case LOONGARCH_CPUCFG0:
*v = GENMASK(31, 0);
return 0;
case LOONGARCH_CPUCFG1:
/* CPUCFG1_MSGINT is not supported by KVM */
*v = GENMASK(25, 0);
return 0;
case LOONGARCH_CPUCFG2:
/* CPUCFG2 features unconditionally supported by KVM */
*v = CPUCFG2_FP | CPUCFG2_FPSP | CPUCFG2_FPDP |
CPUCFG2_FPVERS | CPUCFG2_LLFTP | CPUCFG2_LLFTPREV |
CPUCFG2_LAM;
CPUCFG2_LSPW | CPUCFG2_LAM;
/*
* For the ISA extensions listed below, if one is supported
* by the host, then it is also supported by KVM.
@ -318,14 +325,26 @@ static int _kvm_get_cpucfg_mask(int id, u64 *v)
if (cpu_has_lasx)
*v |= CPUCFG2_LASX;
return 0;
case LOONGARCH_CPUCFG3:
*v = GENMASK(16, 0);
return 0;
case LOONGARCH_CPUCFG4:
case LOONGARCH_CPUCFG5:
*v = GENMASK(31, 0);
return 0;
case LOONGARCH_CPUCFG16:
*v = GENMASK(16, 0);
return 0;
case LOONGARCH_CPUCFG17 ... LOONGARCH_CPUCFG20:
*v = GENMASK(30, 0);
return 0;
default:
/*
* No restrictions on other valid CPUCFG IDs' values, but
* CPUCFG data is limited to 32 bits as the LoongArch ISA
* manual says (Volume 1, Section 2.2.10.5 "CPUCFG").
* CPUCFG bits should be zero if reserved by HW or not
* supported by KVM.
*/
*v = U32_MAX;
*v = 0;
return 0;
}
}
@ -344,7 +363,7 @@ static int kvm_check_cpucfg(int id, u64 val)
return -EINVAL;
switch (id) {
case 2:
case LOONGARCH_CPUCFG2:
if (!(val & CPUCFG2_LLFTP))
/* Guests must have a constant timer */
return -EINVAL;