[Qemu-ppc] [RFCv2 1/2] pseries: Fix incorrect calculation of threads per socket for chip-id

[David Gibson]

The device tree presented to pseries machine type guests includes an
ibm,chip-id property which gives essentially the socket number of each
vcpu core (individual vcpu threads don't get a node in the device
tree).

To calculate this, it uses a vcpus_per_socket variable computed as
(smp_cpus / #sockets).  This is correct for the usual case where
smp_cpus == smp_threads * smp_cores * #sockets.

However, you can start QEMU with the number of cores and threads
mismatching the total number of vcpus (whether that _should_ be
permitted is a topic for another day).  It's a bit hard to say what
the "real" number of vcpus per socket here is, but for most purposes
(smp_threads * smp_cores) will more meaningfully match how QEMU
behaves with respect to socket boundaries.

Signed-off-by: David Gibson <address@hidden>
---
 hw/ppc/spapr.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 783763f..dbc295b 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -595,8 +595,7 @@ static void spapr_populate_cpu_dt(CPUState *cs, void *fdt, 
int offset,
     uint32_t page_sizes_prop[64];
     size_t page_sizes_prop_size;
     QemuOpts *opts = qemu_opts_find(qemu_find_opts("smp-opts"), NULL);
-    unsigned sockets = opts ? qemu_opt_get_number(opts, "sockets", 0) : 0;
-    uint32_t cpus_per_socket = sockets ? (smp_cpus / sockets) : 1;
+    uint32_t vcpus_per_socket = smp_threads * smp_cores;
     uint32_t pft_size_prop[] = {0, cpu_to_be32(spapr->htab_shift)};
 
     _FDT((fdt_setprop_cell(fdt, offset, "reg", index)));
@@ -665,7 +664,7 @@ static void spapr_populate_cpu_dt(CPUState *cs, void *fdt, 
int offset,
     }
 
     _FDT((fdt_setprop_cell(fdt, offset, "ibm,chip-id",
-                           cs->cpu_index / cpus_per_socket)));
+                           cs->cpu_index / vcpus_per_socket)));
 
     _FDT((fdt_setprop(fdt, offset, "ibm,pft-size",
                       pft_size_prop, sizeof(pft_size_prop))));
-- 
2.4.3