[Xen-devel] [PATCH v4 0/4] x86/smp: fix send_IPI_mask usage of scratch_cpumask

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Hello,

Commit:

5500d265a2a8fa63d60c08beb549de8ec82ff7a5
x86/smp: use APIC ALLBUT destination shorthand when possible

Introduced a bogus usage of the scratch cpumask: it was used in a
function that could be called from interrupt context, and hence using
the scratch cpumask there is not safe. Patch #4 is a fix for that usage,
together with also preventing the usage of any per-CPU variables when
send_IPI_mask is called from #MC or NMI context. Previous patches are
preparatory changes.

Thanks, Roger.

Roger Pau Monne (4):
  x86: introduce a nmi_count tracking variable
  x86: track when in NMI context
  x86: track when in #MC context
  x86/smp: do not use scratch_cpumask when in interrupt or exception
    context

 xen/arch/x86/cpu/mcheck/mce.c |  2 ++
 xen/arch/x86/nmi.c            | 11 +++++------
 xen/arch/x86/smp.c            | 12 ++++++++++++
 xen/arch/x86/traps.c          | 10 +++++++++-
 xen/include/asm-x86/hardirq.h | 13 ++++++++++++-
 xen/include/asm-x86/nmi.h     |  2 ++
 xen/include/xen/irq_cpustat.h |  1 -
 7 files changed, 42 insertions(+), 9 deletions(-)

-- 
2.25.0


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