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KVM: nVMX: Really make emulated nested preemption timer pinned

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The PINNED bit is ignored by hrtimer_init. It is only considered when
starting the timer.

When the hrtimer isn't pinned to the same logical processor as the
vCPU thread to be interrupted, the emulated VMX-preemption timer
often fails to adhere to the architectural specification.

Fixes: f15a75eedc ("KVM: nVMX: make emulated nested preemption timer pinned")
Signed-off-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Peter Shier <pshier@google.com>
Reviewed-by: Oliver Upton <oupton@google.com>
Message-Id: <20200508203643.85477-2-jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jim Mattson
2020-05-08 13:36:41 -07:00
committed by Paolo Bonzini
parent 6c1c6e5835
commit 1739f3d56d
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/vmx/nested.c
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@@ -2113,7 +2113,7 @@ static void vmx_start_preemption_timer(struct kvm_vcpu *vcpu)
preemption_timeout *= 1000000;
do_div(preemption_timeout, vcpu->arch.virtual_tsc_khz);
hrtimer_start(&vmx->nested.preemption_timer,
ns_to_ktime(preemption_timeout), HRTIMER_MODE_REL);
ns_to_ktime(preemption_timeout), HRTIMER_MODE_REL_PINNED);
}
static u64 nested_vmx_calc_efer(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12)