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KVM: selftests: VMX preemption timer migration test

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When a nested VM with a VMX-preemption timer is migrated, verify that the
nested VM and its parent VM observe the VMX-preemption timer exit close to
the original expiration deadline.

Signed-off-by: Makarand Sonare <makarandsonare@google.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Message-Id: <20200526215107.205814-3-makarandsonare@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Makarand Sonare
2020-05-26 14:51:07 -07:00
committed by Paolo Bonzini
parent 850448f35a
commit 8d7fbf01f9
8 changed files with 298 additions and 12 deletions
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12
arch/x86/kvm/vmx/nested.c
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@@ -2091,20 +2091,16 @@ static u64 vmx_calc_preemption_timer_value(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
u64 timer_value = 0;
u64 l1_scaled_tsc = kvm_read_l1_tsc(vcpu, rdtsc()) >>
VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE;
if (!vmx->nested.has_preemption_timer_deadline) {
timer_value = vmcs12->vmx_preemption_timer_value;
vmx->nested.preemption_timer_deadline = timer_value +
l1_scaled_tsc;
vmx->nested.preemption_timer_deadline =
vmcs12->vmx_preemption_timer_value + l1_scaled_tsc;
vmx->nested.has_preemption_timer_deadline = true;
} else if (l1_scaled_tsc < vmx->nested.preemption_timer_deadline)
timer_value = vmx->nested.preemption_timer_deadline -
l1_scaled_tsc;
return timer_value;
}
return vmx->nested.preemption_timer_deadline - l1_scaled_tsc;
}
static void vmx_start_preemption_timer(struct kvm_vcpu *vcpu,