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KVM: arm/arm64: Support EL1 phys timer register access in set/get reg

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Add suport for the physical timer registers in kvm_arm_timer_set_reg and
kvm_arm_timer_get_reg so that these functions can be reused to interact
with the rest of the system.

Note that this paves part of the way for the physical timer state
save/restore, but we still need to add those registers to
KVM_GET_REG_LIST before we support migrating the physical timer state.

Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
This commit is contained in:
Christoffer Dall
2017-06-16 23:08:57 -07:00
committed by Christoffer Dall
parent b103cc3f10
commit 5c5196da4e
3 changed files with 43 additions and 2 deletions
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33
virt/kvm/arm/arch_timer.c
View File

@@ -628,10 +628,11 @@ static void kvm_timer_init_interrupt(void *info)
int kvm_arm_timer_set_reg(struct kvm_vcpu *vcpu, u64 regid, u64 value)
{
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
switch (regid) {
case KVM_REG_ARM_TIMER_CTL:
vtimer->cnt_ctl = value;
vtimer->cnt_ctl = value & ~ARCH_TIMER_CTRL_IT_STAT;
break;
case KVM_REG_ARM_TIMER_CNT:
update_vtimer_cntvoff(vcpu, kvm_phys_timer_read() - value);
@@ -639,6 +640,13 @@ int kvm_arm_timer_set_reg(struct kvm_vcpu *vcpu, u64 regid, u64 value)
case KVM_REG_ARM_TIMER_CVAL:
vtimer->cnt_cval = value;
break;
case KVM_REG_ARM_PTIMER_CTL:
ptimer->cnt_ctl = value & ~ARCH_TIMER_CTRL_IT_STAT;
break;
case KVM_REG_ARM_PTIMER_CVAL:
ptimer->cnt_cval = value;
break;
default:
return -1;
}
@@ -647,17 +655,38 @@ int kvm_arm_timer_set_reg(struct kvm_vcpu *vcpu, u64 regid, u64 value)
return 0;
}
static u64 read_timer_ctl(struct arch_timer_context *timer)
{
/*
* Set ISTATUS bit if it's expired.
* Note that according to ARMv8 ARM Issue A.k, ISTATUS bit is
* UNKNOWN when ENABLE bit is 0, so we chose to set ISTATUS bit
* regardless of ENABLE bit for our implementation convenience.
*/
if (!kvm_timer_compute_delta(timer))
return timer->cnt_ctl | ARCH_TIMER_CTRL_IT_STAT;
else
return timer->cnt_ctl;
}
u64 kvm_arm_timer_get_reg(struct kvm_vcpu *vcpu, u64 regid)
{
struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
switch (regid) {
case KVM_REG_ARM_TIMER_CTL:
return vtimer->cnt_ctl;
return read_timer_ctl(vtimer);
case KVM_REG_ARM_TIMER_CNT:
return kvm_phys_timer_read() - vtimer->cntvoff;
case KVM_REG_ARM_TIMER_CVAL:
return vtimer->cnt_cval;
case KVM_REG_ARM_PTIMER_CTL:
return read_timer_ctl(ptimer);
case KVM_REG_ARM_PTIMER_CVAL:
return ptimer->cnt_cval;
case KVM_REG_ARM_PTIMER_CNT:
return kvm_phys_timer_read();
}
return (u64)-1;
}