kvm/x86: Hyper-V fix SynIC timer disabling condition
authorAndrey Smetanin <asmetanin@virtuozzo.com>
Mon, 28 Dec 2015 15:27:22 +0000 (18:27 +0300)
committerPaolo Bonzini <pbonzini@redhat.com>
Fri, 8 Jan 2016 18:04:41 +0000 (19:04 +0100)
commit23a3b201fd187f1e7af573b3794c3c5ebf7d2c06
tree8b8c0cabd788f2fa798e9994dd58f82b9dccca8c
parent0cdeabb1186fc3a6c7854f05cec7c99e32935ebc
kvm/x86: Hyper-V fix SynIC timer disabling condition

Hypervisor Function Specification(HFS) doesn't require
to disable SynIC timer at timer config write if timer->count = 0.

So drop this check, this allow to load timers MSR's
during migration restore, because config are set before count
in QEMU side.

Also fix condition according to HFS doc(15.3.1):
"It is not permitted to set the SINTx field to zero for an
enabled timer. If attempted, the timer will be
marked disabled (that is, bit 0 cleared) immediately."

Signed-off-by: Andrey Smetanin <asmetanin@virtuozzo.com>
Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
CC: Gleb Natapov <gleb@kernel.org>
CC: Paolo Bonzini <pbonzini@redhat.com>
CC: Roman Kagan <rkagan@virtuozzo.com>
CC: Denis V. Lunev <den@openvz.org>
CC: qemu-devel@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
arch/x86/kvm/hyperv.c