]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
ppc/kvm: Set the runlatch bit of a CPU just before starting guest
authorPreeti U Murthy <preeti@linux.vnet.ibm.com>
Fri, 11 Apr 2014 10:31:58 +0000 (16:01 +0530)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Mon, 28 Apr 2014 06:32:45 +0000 (16:32 +1000)
commitfd17dc7b9a8d57150ee0121c4c83edbb7e26eece
tree22d9917f3fd13d246c0f3dd2a373eec3551c9028
parentf203891117323dd31c11adcbba60452c933d604e
ppc/kvm: Set the runlatch bit of a CPU just before starting guest

The secondary threads in the core are kept offline before launching guests
in kvm on powerpc: "371fefd6f2dc4666:KVM: PPC: Allow book3s_hv guests to use
SMT processor modes."

Hence their runlatch bits are cleared. When the secondary threads are called
in to start a guest, their runlatch bits need to be set to indicate that they
are busy. The primary thread has its runlatch bit set though, but there is no
harm in setting this bit once again. Hence set the runlatch bit for all
threads before they start guest.

Signed-off-by: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
arch/powerpc/kvm/book3s_hv_rmhandlers.S