Commit fd17dc7b9a8d57150ee0121c4c83edbb7e26eece
Committed by
Benjamin Herrenschmidt
1 parent
f203891117
Exists in
master
and in
13 other branches
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>
Showing 1 changed file with 6 additions and 0 deletions Side-by-side Diff
arch/powerpc/kvm/book3s_hv_rmhandlers.S
... | ... | @@ -242,6 +242,12 @@ |
242 | 242 | */ |
243 | 243 | .globl kvm_start_guest |
244 | 244 | kvm_start_guest: |
245 | + | |
246 | + /* Set runlatch bit the minute you wake up from nap */ | |
247 | + mfspr r1, SPRN_CTRLF | |
248 | + ori r1, r1, 1 | |
249 | + mtspr SPRN_CTRLT, r1 | |
250 | + | |
245 | 251 | ld r2,PACATOC(r13) |
246 | 252 | |
247 | 253 | li r0,KVM_HWTHREAD_IN_KVM |