KVM: PPC: Book3S HV P9: Improve mtmsrd scheduling by delaying MSR[EE] disable

Browse source

Moving the mtmsrd after the host SPRs are saved and before the guest
SPRs start to be loaded can prevent an SPR scoreboard stall (because
the mtmsrd is L=1 type which does not cause context synchronisation.

This is also now more convenient to combined with the mtmsrd L=0
instruction to enable facilities just below, but that is not done yet.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211123095231.1036501-21-npiggin@gmail.com

...

This commit is contained in:

Nicholas Piggin 2021-11-23 19:51:58 +10:00 • committed by Michael Ellerman

parent 34e119c96b

commit 2251fbe763

1 changed files with 18 additions and 5 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

23

arch/powerpc/kvm/book3s_hv.c

View file