Windows 2012 guests can notify hypervisor about occurred guest crash (Windows bugcheck(BSOD)) by writing specific Hyper-V msrs. This patch does handling of this MSR's by KVM and sending notification to user space that allows to gather Windows guest crash dump by QEMU/LIBVIRT.
The idea is to provide functionality equal to pvpanic device without QEMU guest agent for Windows. The idea is borrowed from Linux HyperV bus driver and validated against Windows 2k12. Changes from v1: * hyperv code move to hyperv.c * added read handlers of crash data msrs * added per vm and per cpu hyperv context structures * added saving crash msrs inside qemu cpu state * added qemu fetch and update of crash msrs * added qemu crash msrs store in cpu state and it's migration Signed-off-by: Andrey Smetanin <asmeta...@virtuozzo.com> Signed-off-by: Denis V. Lunev <d...@openvz.org> CC: Gleb Natapov <g...@kernel.org> CC: Paolo Bonzini <pbonz...@redhat.com>
