[v5,0/3] xen/x86: implement NMI continuation

Message

Juergen Gross Nov. 12, 2020, 1:14 p.m. UTC

Move sending of a virq event for oprofile to the local vcpu from NMI
to normal interrupt context.

This has been tested with a small test patch using the continuation
framework of patch 1 for all NMIs and doing a print to console in
the continuation handler.

Version 1 of this small series was sent to the security list before.

Changes in V3:
- switched to self-IPI instead of softirq
- added patch 3

Changes in V4:
- use less generic approach

Changes in V5:
- addressed comments

Juergen Gross (3):
  xen/x86: add nmi continuation framework
  xen/oprofile: use NMI continuation for sending virq to guest
  xen/x86: issue pci_serr error message via NMI continuation

 xen/arch/x86/apic.c             | 13 +++++++---
 xen/arch/x86/genapic/x2apic.c   |  1 +
 xen/arch/x86/oprofile/nmi_int.c | 19 ++++++++++++--
 xen/arch/x86/smp.c              |  1 +
 xen/arch/x86/traps.c            | 46 ++++++++++++++++++++++++++++-----
 xen/include/asm-x86/nmi.h       | 11 +++++++-
 xen/include/asm-x86/softirq.h   |  5 ++--
 xen/include/asm-x86/xenoprof.h  |  7 +++++
 8 files changed, 88 insertions(+), 15 deletions(-)