Historically when running as Xen PV guest all MSR accesses have been
silently swallowing any GP faults, even when the kernel was using not
the *msr_safe() access functions.
Change that by making the behavior controllable via kernel config and
via a boot parameter.
This will help finding paths where MSRs are being accessed under Xen
which are not emulated by the hypervisor.
Juergen Gross (3):
xen/pv: allow pmu msr accesses to cause GP
xen/pv: refactor msr access functions to support safe and unsafe
accesses
xen/pv: support selecting safe/unsafe msr accesses
.../admin-guide/kernel-parameters.txt | 6 ++
arch/x86/xen/Kconfig | 9 ++
arch/x86/xen/enlighten_pv.c | 97 +++++++++++++------
arch/x86/xen/pmu.c | 44 +++++----
4 files changed, 110 insertions(+), 46 deletions(-)
--
2.35.3
