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authorAndre Przywara <andre.przywara@arm.com>2018-07-05 16:48:23 +0100
committerMarc Zyngier <marc.zyngier@arm.com>2019-02-19 21:05:40 +0000
commit84135d3d18da2ff17d3ad1a609b2818cc3049552 (patch)
treec72a908ddb0d63d73e186273e3b12c0f180ea9c2 /virt
parent09838de943d4c0ee75a99cd7665940705ab8dcea (diff)
downloadlinux-stericsson-84135d3d18da2ff17d3ad1a609b2818cc3049552.tar.gz
KVM: arm/arm64: consolidate arch timer trap handlers
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>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/arm/arch_timer.c130
1 files changed, 113 insertions, 17 deletions
diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c
index 4986028d9829..f7d377448438 100644
--- a/virt/kvm/arm/arch_timer.c
+++ b/virt/kvm/arm/arch_timer.c
@@ -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);