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kvm: Cap halt polling at kvm->max_halt_poll_ns

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commit 258785ef08b323bddd844b4926a32c2b2045a1b0 upstream.

When growing halt-polling, there is no check that the poll time exceeds
the per-VM limit. It's possible for vcpu->halt_poll_ns to grow past
kvm->max_halt_poll_ns and stay there until a halt which takes longer
than kvm->halt_poll_ns.

Signed-off-by: David Matlack <dmatlack@google.com>
Signed-off-by: Venkatesh Srinivas <venkateshs@chromium.org>
Message-Id: <20210506152442.4010298-1-venkateshs@chromium.org>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Matlack 2021-05-06 15:24:43 +00:00 committed by Greg Kroah-Hartman
parent 53d7eed031
commit 21756f878e
1 changed files with 2 additions and 2 deletions
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4
virt/kvm/kvm_main.c
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@ -2717,8 +2717,8 @@ static void grow_halt_poll_ns(struct kvm_vcpu *vcpu)
if (val < grow_start)
val = grow_start;
if (val > halt_poll_ns)
val = halt_poll_ns;
if (val > vcpu->kvm->max_halt_poll_ns)
val = vcpu->kvm->max_halt_poll_ns;
vcpu->halt_poll_ns = val;
out: