This series add support for MTE(Memory Tagging Extension)[1]
in KVM guest. It's based on Steven Price's kernel KVM patches
V7[2], and has been tested to ensure that test case[3] can be
passed in a KVM guest. Basic pre-copy migration test also passed
between two MTE enabled kvm guest.
This is a RFC patch series becuase:
(1) Need to add some arm MTE specific codes to the ram migration
loop. There may be better way to do that in a more abstract way.
(2) Only pre-copy migration is supported and tested currently,
post-copy as well as compress/zero page migration are still WIP.
All kinds of feedbacks are very welcomed, especially for the migration
support.
Note:
(1) To support MTE migration, tags for one page are appended to
the page data during ram save iteration which make it easier
to sync the page data and tags.
[1] https://community.arm.com/developer/ip-products/processors/b/
processors-ip-blog/posts/enhancing-memory-safety
[2] https://lwn.net/Articles/842827/
[3] https://elixir.bootlin.com/linux/latest/source/Documentation/
arm64/memory-tagging-extension.rst
Haibo Xu (5):
Update Linux headers with new MTE support
Add basic MTE support to KVM guest
Add APIs to get/set MTE tags
Add migration support for KVM guest with MTE
Enable the MTE support for KVM guest
hw/arm/virt.c | 44 +++++++++++++-------
include/hw/arm/virt.h | 2 +
include/migration/misc.h | 1 +
linux-headers/linux/kvm.h | 15 +++++++
migration/ram.c | 86 ++++++++++++++++++++++++++++++++++++++-
target/arm/cpu.c | 2 +-
target/arm/kvm.c | 9 ++++
target/arm/kvm64.c | 31 ++++++++++++++
target/arm/kvm_arm.h | 2 +
9 files changed, 176 insertions(+), 16 deletions(-)
--
2.17.1
