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| author |   Juergen Gross <jgross@suse.com> | 2022-09-26 13:16:56 +0200 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2022-10-11 10:51:05 +0200 |
| commit | 3fac3734c43a2e21fefeb72124d8bd31dff3956f (patch) | |
| tree | d500099e8e4eb012db4510dfaf17da126f3156df /Documentation | |
| parent | xen/pv: refactor msr access functions to support safe and unsafe accesses (diff) | |
| download | linux-dev-3fac3734c43a2e21fefeb72124d8bd31dff3956f.tar.xz linux-dev-3fac3734c43a2e21fefeb72124d8bd31dff3956f.zip | |
xen/pv: support selecting safe/unsafe msr accesses
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>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 426fa892d311..1bda9cf18fae 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -6836,6 +6836,12 @@ Crash from Xen panic notifier, without executing late panic() code such as dumping handler. + xen_msr_safe= [X86,XEN] + Format: <bool> + Select whether to always use non-faulting (safe) MSR + access functions when running as Xen PV guest. The + default value is controlled by CONFIG_XEN_PV_MSR_SAFE. + xen_nopvspin [X86,XEN] Disables the qspinlock slowpath using Xen PV optimizations. This parameter is obsoleted by "nopvspin" parameter, which |