Re: [Qemu-devel] [PATCH v6 0/12] HyperV equivalent of pvpanic driver

[Paolo Bonzini <pbonzini@redhat.com>]

On 03/07/2015 14:01, Denis V. Lunev wrote:
> 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 v5:
> * added hyperv crash msrs into supported/emulated list
> * qemu: reset CPUState::crash_occurred at cpu reset
> * qemu: userspace checks kernel support of hyperv crash msrs
>   by kvm_get_supported_msrs
> 
> Changes from v4:
> * fixed typo in email of Andreas Färber <afaerber@suse.de>
>   my vim strangely behaves on lines with extended Deutch chars
> 
> Changes from v3:
> * remove unused HV_X64_MSR_CRASH_CTL_NOTIFY
> * added documentation section about KVM_SYSTEM_EVENT_CRASH
> * allow only supported values inside crash ctl msr
> * qemu: split patch into generic crash handling patches and hyperv specific
> * qemu: skip migration of crash ctl msr value
> 
> Changes from v2:
> * forbid modification crash ctl msr by guest
> * qemu_system_guest_panicked usage in pvpanic and s390x
> * hyper-v crash handler move from generic kvm to i386
> * hyper-v crash handler: skip fetching crash msrs just mark crash occurred
> * sync with linux-next 20150629
> * patch 11 squashed to patch 10
> * patch 9 squashed to patch 7
> 
> 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 <asmetanin@virtuozzo.com>
> Signed-off-by: Denis V. Lunev <den@openvz.org>
> CC: Gleb Natapov <gleb@kernel.org>
> CC: Paolo Bonzini <pbonzini@redhat.com>
> 

I'm queuing patches 1-8 to the KVM tree.  For patch 9-12, I've applied
them locally but would like Eduardo or Andreas to ack 11 and 12.

Paolo