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Date: Mon, 17 May 2021 15:58:55 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, David Matlack <dmatlack@...gle.com>,
Venkatesh Srinivas <venkateshs@...omium.org>,
Paolo Bonzini <pbonzini@...hat.com>
Subject: [PATCH 5.10 010/289] kvm: Cap halt polling at kvm->max_halt_poll_ns
From: David Matlack <dmatlack@...gle.com>
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@...gle.com>
Signed-off-by: Venkatesh Srinivas <venkateshs@...omium.org>
Message-Id: <20210506152442.4010298-1-venkateshs@...omium.org>
Cc: stable@...r.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
virt/kvm/kvm_main.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2717,8 +2717,8 @@ static void grow_halt_poll_ns(struct kvm
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:
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