> From: Andrew Cooper [mailto:andrew.coop...@citrix.com] > Sent: Saturday, June 9, 2018 2:49 AM > > The main purpose of this patch is to only ever insert the LBR MSRs into the > guest load/save list once, as a future patch wants to change the behaviour > of > vmx_add_guest_msr(). > > The repeated processing of lbr_info and the guests MSR load/save list is > redundant, and a guest using LBR itself will have to re-enable > MSR_DEBUGCTL.LBR in its #DB handler, meaning that Xen will repeat this > redundant processing every time the guest gets a debug exception. > > Rename lbr_fixup_enabled to lbr_flags to be a little more generic, and use > one > bit to indicate that the MSRs have been inserted into the load/save list. > Shorten the existing FIXUP* identifiers to reduce code volume. > > Finally, the enablement of the fixups only need to be calculated once, > rather > than inside a doubly nested loop. > > Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com>
Acked-by: Kevin Tian <kevin.t...@intel.com> _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
