xen/pv: support selecting safe/unsafe msr accesses

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Instead of always doing the safe variants for reading and writing MSRs
in Xen PV guests, make the behavior controllable via Kconfig option
and a boot parameter.

The default will be the current behavior, which is to always use the
safe variant.

Signed-off-by: Juergen Gross <jgross@suse.com>

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This commit is contained in:

Juergen Gross 2022-09-26 13:16:56 +02:00

parent a1886b915e

commit 3fac3734c4

3 changed files with 29 additions and 10 deletions

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6

Documentation/admin-guide/kernel-parameters.txt

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9

arch/x86/xen/Kconfig

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24

arch/x86/xen/enlighten_pv.c

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