[PATCHv2 0/2] log guest name and memory error type AO, AR for MCEs

[Mario Smarduch <msmarduch@digitalocean.com>]

In a large VPC environment we want to log memory error occurrences
and log them with guest name and type - there are few use cases


- if VM crashes on AR mce inform the user about the reason and resolve the case
- if VM hangs notify the user to reboot and resume processing
- if VM continues to run let the user know, he/she maybe able to correlate
  to vm internal outage
- Rawhammer attacks - isolate/determine the attacker possible migrating it off
  the hypervisor
- In general track memory errors on a hyperviosr over time to determine trends

Monitoring our fleet we come across quite a few of these and been
able to take action where before there were no clues to the causes.

When memory error occurs we get a log entry in qemu log:

Guest [Droplet-12345678] 2019-08-02T05:00:11.940270Z qemu-system-x86_64:
Guest MCE Memory Error at QEMU addr 0x7f3c7622f000 and GUEST 0x78e42f000
addr of type BUS_MCEERR_AR injected

with enterprise logging environment we can to take further actions.

v1 -> v2:
- split into two patches one to get the gustname second to log MCEs 
- addressed comments for MCE logging

Mario Smarduch (2):
  util/qemu-error: add guest name helper with -msg options
  target/i386: log MCE guest and host addresses

 include/qemu/error-report.h |  1 +
 qemu-options.hx             | 10 ++++++----
 target/i386/kvm.c           | 29 ++++++++++++++++++++++++-----
 util/qemu-error.c           | 31 +++++++++++++++++++++++++++++++
 vl.c                        |  5 +++++
 5 files changed, 67 insertions(+), 9 deletions(-)

-- 
2.9.3