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KVM: arm/arm64: arch_timer: Fix CNTP_TVAL calculation

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Recently the generic timer test of kvm-unit-tests failed to complete
(stalled) when a physical timer is being used. This issue is caused
by incorrect update of CNTP_CVAL when CNTP_TVAL is being accessed,
introduced by 'Commit 84135d3d18 ("KVM: arm/arm64: consolidate arch
timer trap handlers")'. According to Arm ARM, the read/write behavior
of accesses to the TVAL registers is expected to be:

  * READ: TimerValue = (CompareValue – (Counter - Offset)
  * WRITE: CompareValue = ((Counter - Offset) + Sign(TimerValue)

This patch fixes the TVAL read/write code path according to the
specification.

Fixes: 84135d3d18 ("KVM: arm/arm64: consolidate arch timer trap handlers")
Signed-off-by: Wei Huang <wei@redhat.com>
[maz: commit message tidy-up]
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Wei Huang 2019-03-29 15:12:53 -05:00 committed by Marc Zyngier
parent 8324c3d518
commit 8fa7616248
1 changed files with 2 additions and 2 deletions
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4
virt/kvm/arm/arch_timer.c
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@ -812,7 +812,7 @@ static u64 kvm_arm_timer_read(struct kvm_vcpu *vcpu,
switch (treg) {
case TIMER_REG_TVAL:
val = kvm_phys_timer_read() - timer->cntvoff - timer->cnt_cval;
val = timer->cnt_cval - kvm_phys_timer_read() + timer->cntvoff;
break;
case TIMER_REG_CTL:
@ -858,7 +858,7 @@ static void kvm_arm_timer_write(struct kvm_vcpu *vcpu,
{
switch (treg) {
case TIMER_REG_TVAL:
timer->cnt_cval = val - kvm_phys_timer_read() - timer->cntvoff;
timer->cnt_cval = kvm_phys_timer_read() - timer->cntvoff + val;
break;
case TIMER_REG_CTL: