| Message ID | 20180114192349.22212-2-joserz@linux.vnet.ibm.com |
|---|---|
| State | New |
| Headers | show |
| Series | Small fixes for SMT guests in Power9 | expand |
On Sun, Jan 14, 2018 at 05:23:48PM -0200, Jose Ricardo Ziviani wrote: > Increases the max smt mode to 8 for Power9. That's because KVM supports > smt emulation in this platform so QEMU should allow users to use it as > well. > > Today if we try to pass -smp ...,threads=8, QEMU will silently truncate > it to smt4 mode and may cause a crash if we try to perform a cpu > hotplug. > > Signed-off-by: Jose Ricardo Ziviani <joserz@linux.vnet.ibm.com> Applied, with the addition of a comment explaining why we want this despite the hardware limit. > --- > target/ppc/compat.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/target/ppc/compat.c b/target/ppc/compat.c > index ad8f93c064..d1770cdc6f 100644 > --- a/target/ppc/compat.c > +++ b/target/ppc/compat.c > @@ -73,7 +73,7 @@ static const CompatInfo compat_table[] = { > .pvr = CPU_POWERPC_LOGICAL_3_00, > .pcr = PCR_COMPAT_3_00, > .pcr_level = PCR_COMPAT_3_00, > - .max_threads = 4, > + .max_threads = 8, > }, > }; >
diff --git a/target/ppc/compat.c b/target/ppc/compat.c index ad8f93c064..d1770cdc6f 100644 --- a/target/ppc/compat.c +++ b/target/ppc/compat.c @@ -73,7 +73,7 @@ static const CompatInfo compat_table[] = { .pvr = CPU_POWERPC_LOGICAL_3_00, .pcr = PCR_COMPAT_3_00, .pcr_level = PCR_COMPAT_3_00, - .max_threads = 4, + .max_threads = 8, }, };
Increases the max smt mode to 8 for Power9. That's because KVM supports smt emulation in this platform so QEMU should allow users to use it as well. Today if we try to pass -smp ...,threads=8, QEMU will silently truncate it to smt4 mode and may cause a crash if we try to perform a cpu hotplug. Signed-off-by: Jose Ricardo Ziviani <joserz@linux.vnet.ibm.com> --- target/ppc/compat.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)