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

From: Denis V. Lunev
Subject: [Qemu-devel] [PATCH v6 0/12] HyperV equivalent of pvpanic driver
Date: Fri, 3 Jul 2015 15:01:33 +0300

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 <address@hidden>
  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 <address@hidden>
Signed-off-by: Denis V. Lunev <address@hidden>
CC: Gleb Natapov <address@hidden>
CC: Paolo Bonzini <address@hidden>

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