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KVM: arm/arm64: consolidate arch timer trap handlers

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At the moment we have separate system register emulation handlers for
each timer register. Actually they are quite similar, and we rely on
kvm_arm_timer_[gs]et_reg() for the actual emulation anyways, so let's
just merge all of those handlers into one function, which just marshalls
the arguments and then hands off to a set of common accessors.
This makes extending the emulation to include EL2 timers much easier.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
[Fixed 32-bit VM breakage and reduced to reworking existing code]
Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>
[Fixed 32bit host, general cleanup]
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Andre Przywara
2018-07-05 16:48:23 +01:00
committed by Marc Zyngier
parent 09838de943
commit 84135d3d18
5 changed files with 187 additions and 66 deletions
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130
virt/kvm/arm/arch_timer.c
View File

@@ -25,6 +25,7 @@
#include <clocksource/arm_arch_timer.h>
#include <asm/arch_timer.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_hyp.h>
#include <kvm/arm_vgic.h>
@@ -52,6 +53,13 @@ static bool kvm_timer_irq_can_fire(struct arch_timer_context *timer_ctx);
static void kvm_timer_update_irq(struct kvm_vcpu *vcpu, bool new_level,
struct arch_timer_context *timer_ctx);
static bool kvm_timer_should_fire(struct arch_timer_context *timer_ctx);
static void kvm_arm_timer_write(struct kvm_vcpu *vcpu,
struct arch_timer_context *timer,
enum kvm_arch_timer_regs treg,
u64 val);
static u64 kvm_arm_timer_read(struct kvm_vcpu *vcpu,
struct arch_timer_context *timer,
enum kvm_arch_timer_regs treg);
u64 kvm_phys_timer_read(void)
{
@@ -628,24 +636,25 @@ 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 & ~ARCH_TIMER_CTRL_IT_STAT;
kvm_arm_timer_write(vcpu,
vcpu_vtimer(vcpu), TIMER_REG_CTL, value);
break;
case KVM_REG_ARM_TIMER_CNT:
update_vtimer_cntvoff(vcpu, kvm_phys_timer_read() - value);
break;
case KVM_REG_ARM_TIMER_CVAL:
vtimer->cnt_cval = value;
kvm_arm_timer_write(vcpu,
vcpu_vtimer(vcpu), TIMER_REG_CVAL, value);
break;
case KVM_REG_ARM_PTIMER_CTL:
ptimer->cnt_ctl = value & ~ARCH_TIMER_CTRL_IT_STAT;
kvm_arm_timer_write(vcpu,
vcpu_ptimer(vcpu), TIMER_REG_CTL, value);
break;
case KVM_REG_ARM_PTIMER_CVAL:
ptimer->cnt_cval = value;
kvm_arm_timer_write(vcpu,
vcpu_ptimer(vcpu), TIMER_REG_CVAL, value);
break;
default:
@@ -672,26 +681,113 @@ static u64 read_timer_ctl(struct arch_timer_context *timer)
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 read_timer_ctl(vtimer);
return kvm_arm_timer_read(vcpu,
vcpu_vtimer(vcpu), TIMER_REG_CTL);
case KVM_REG_ARM_TIMER_CNT:
return kvm_phys_timer_read() - vtimer->cntvoff;
return kvm_arm_timer_read(vcpu,
vcpu_vtimer(vcpu), TIMER_REG_CNT);
case KVM_REG_ARM_TIMER_CVAL:
return vtimer->cnt_cval;
return kvm_arm_timer_read(vcpu,
vcpu_vtimer(vcpu), TIMER_REG_CVAL);
case KVM_REG_ARM_PTIMER_CTL:
return read_timer_ctl(ptimer);
case KVM_REG_ARM_PTIMER_CVAL:
return ptimer->cnt_cval;
return kvm_arm_timer_read(vcpu,
vcpu_ptimer(vcpu), TIMER_REG_CTL);
case KVM_REG_ARM_PTIMER_CNT:
return kvm_phys_timer_read();
return kvm_arm_timer_read(vcpu,
vcpu_vtimer(vcpu), TIMER_REG_CNT);
case KVM_REG_ARM_PTIMER_CVAL:
return kvm_arm_timer_read(vcpu,
vcpu_ptimer(vcpu), TIMER_REG_CVAL);
}
return (u64)-1;
}
static u64 kvm_arm_timer_read(struct kvm_vcpu *vcpu,
struct arch_timer_context *timer,
enum kvm_arch_timer_regs treg)
{
u64 val;
switch (treg) {
case TIMER_REG_TVAL:
val = kvm_phys_timer_read() - timer->cntvoff - timer->cnt_cval;
break;
case TIMER_REG_CTL:
val = read_timer_ctl(timer);
break;
case TIMER_REG_CVAL:
val = timer->cnt_cval;
break;
case TIMER_REG_CNT:
val = kvm_phys_timer_read() - timer->cntvoff;
break;
default:
BUG();
}
return val;
}
u64 kvm_arm_timer_read_sysreg(struct kvm_vcpu *vcpu,
enum kvm_arch_timers tmr,
enum kvm_arch_timer_regs treg)
{
u64 val;
preempt_disable();
kvm_timer_vcpu_put(vcpu);
val = kvm_arm_timer_read(vcpu, vcpu_get_timer(vcpu, tmr), treg);
kvm_timer_vcpu_load(vcpu);
preempt_enable();
return val;
}
static void kvm_arm_timer_write(struct kvm_vcpu *vcpu,
struct arch_timer_context *timer,
enum kvm_arch_timer_regs treg,
u64 val)
{
switch (treg) {
case TIMER_REG_TVAL:
timer->cnt_cval = val - kvm_phys_timer_read() - timer->cntvoff;
break;
case TIMER_REG_CTL:
timer->cnt_ctl = val & ~ARCH_TIMER_CTRL_IT_STAT;
break;
case TIMER_REG_CVAL:
timer->cnt_cval = val;
break;
default:
BUG();
}
}
void kvm_arm_timer_write_sysreg(struct kvm_vcpu *vcpu,
enum kvm_arch_timers tmr,
enum kvm_arch_timer_regs treg,
u64 val)
{
preempt_disable();
kvm_timer_vcpu_put(vcpu);
kvm_arm_timer_write(vcpu, vcpu_get_timer(vcpu, tmr), treg, val);
kvm_timer_vcpu_load(vcpu);
preempt_enable();
}
static int kvm_timer_starting_cpu(unsigned int cpu)
{
kvm_timer_init_interrupt(NULL);