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David Matlack 313f636d5c kvm: cap halt polling at exactly halt_poll_ns 
When growing halt-polling, there is no check that the poll time exceeds
the limit. It's possible for vcpu->halt_poll_ns grow once past
halt_poll_ns, and stay there until a halt which takes longer than
vcpu->halt_poll_ns. For example, booting a Linux guest with
halt_poll_ns=11000:

 ... kvm:kvm_halt_poll_ns: vcpu 0: halt_poll_ns 0 (shrink 10000)
 ... kvm:kvm_halt_poll_ns: vcpu 0: halt_poll_ns 10000 (grow 0)
 ... kvm:kvm_halt_poll_ns: vcpu 0: halt_poll_ns 20000 (grow 10000)

Signed-off-by: David Matlack <dmatlack@google.com>
Fixes: aca6ff29c4
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
 		2016-03-09 11:54:14 +01:00
..
kvm kvm: cap halt polling at exactly halt_poll_ns 2016-03-09 11:54:14 +01:00
lib virt: IRQ bypass manager 2015-10-01 15:06:43 +02:00
Makefile virt: Add virt directory to the top Makefile 2015-10-01 15:06:44 +02:00