From: Janosch Frank <frankja@linux.ibm.com>
To: kvm@vger.kernel.org
Cc: linux-s390@vger.kernel.org, borntraeger@linux.ibm.com,
imbrenda@linux.ibm.com
Subject: [PATCH v6 00/11] kvm: s390: Add PV dump support
Date: Tue, 17 May 2022 16:36:18 +0000 [thread overview]
Message-ID: <20220517163629.3443-1-frankja@linux.ibm.com> (raw)
Sometimes dumping inside of a VM fails, is unavailable or doesn't
yield the required data. For these occasions we dump the VM from the
outside, writing memory and cpu data to a file.
Up to now PV guests only supported dumping from the inside of the
guest through dumpers like KDUMP. A PV guest can be dumped from the
hypervisor but the data will be stale and / or encrypted.
To get the actual state of the PV VM we need the help of the
Ultravisor who safeguards the VM state. New UV calls have been added
to initialize the dump, dump storage state data, dump cpu data and
complete the dump process.
I chose not to document the dump data provided by the Ultravisor since
KVM doesn't interprete it in any way. We're currently searching for a
location and enough cycles to make it available to all.
v6:
* Added patch that explains KVM's rc/rrc writes
* Added rev-bys
* Improved documentation
* Reworked capability indication
* Moved the dump completion into a new function
v5:
* v4 went out without a version
* Fixed spelling mistake in query
* Improved the storage state dump code
* Switched to the scheduling uv call for all dump commands
* Fixed the documentation formatting
* Moved the capability into its own patch it shouldn't be part of patch #6
v4:
* Rebased and fixed up conflicts due to the Documentation
changes and new KVM capabilities
* Fixed the dump facility check, now we check for all 4 calls
Janosch Frank (11):
s390x: Add SE hdr query information
s390: uv: Add dump fields to query
KVM: s390: pv: Add query interface
KVM: s390: pv: Add dump support definitions
KVM: s390: pv: Add query dump information
kvm: s390: Add configuration dump functionality
kvm: s390: Add CPU dump functionality
kvm: s390: Add KVM_CAP_S390_PROTECTED_DUMP
Documentation: virt: Protected virtual machine dumps
Documentation/virt/kvm/api.rst: Add protvirt dump/info api
descriptions
Documentation/virt/kvm/api.rst: Explain rc/rrc delivery
Documentation/virt/kvm/api.rst | 163 ++++++++++-
Documentation/virt/kvm/s390/index.rst | 1 +
Documentation/virt/kvm/s390/s390-pv-dump.rst | 64 +++++
arch/s390/boot/uv.c | 4 +
arch/s390/include/asm/kvm_host.h | 1 +
arch/s390/include/asm/uv.h | 45 +++-
arch/s390/kernel/uv.c | 53 ++++
arch/s390/kvm/kvm-s390.c | 269 +++++++++++++++++++
arch/s390/kvm/kvm-s390.h | 5 +
arch/s390/kvm/pv.c | 199 ++++++++++++++
include/uapi/linux/kvm.h | 55 ++++
11 files changed, 856 insertions(+), 3 deletions(-)
create mode 100644 Documentation/virt/kvm/s390/s390-pv-dump.rst
--
2.34.1
next reply other threads:[~2022-05-17 16:36 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-17 16:36 Janosch Frank [this message]
2022-05-17 16:36 ` [PATCH v6 01/11] s390x: Add SE hdr query information Janosch Frank
2022-05-17 16:36 ` [PATCH v6 02/11] s390: uv: Add dump fields to query Janosch Frank
2022-05-17 16:36 ` [PATCH v6 03/11] KVM: s390: pv: Add query interface Janosch Frank
2022-05-17 16:36 ` [PATCH v6 04/11] KVM: s390: pv: Add dump support definitions Janosch Frank
2022-05-17 16:36 ` [PATCH v6 05/11] KVM: s390: pv: Add query dump information Janosch Frank
2022-05-17 16:36 ` [PATCH v6 06/11] kvm: s390: Add configuration dump functionality Janosch Frank
2022-05-17 16:54 ` Claudio Imbrenda
2022-05-17 16:36 ` [PATCH v6 07/11] kvm: s390: Add CPU " Janosch Frank
2022-05-17 16:48 ` Claudio Imbrenda
2022-05-17 16:36 ` [PATCH v6 08/11] kvm: s390: Add KVM_CAP_S390_PROTECTED_DUMP Janosch Frank
2022-05-17 16:48 ` Claudio Imbrenda
2022-05-17 16:36 ` [PATCH v6 09/11] Documentation: virt: Protected virtual machine dumps Janosch Frank
2022-05-17 16:36 ` [PATCH v6 10/11] Documentation/virt/kvm/api.rst: Add protvirt dump/info api descriptions Janosch Frank
2022-05-17 16:47 ` Claudio Imbrenda
2022-05-17 16:36 ` [PATCH v6 11/11] Documentation/virt/kvm/api.rst: Explain rc/rrc delivery Janosch Frank
2022-05-17 16:47 ` Claudio Imbrenda
2022-05-30 13:10 ` [PATCH v6 00/11] kvm: s390: Add PV dump support Christian Borntraeger
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