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 <da...@gibson.dropbear.id.au>
Reviewed-by: Alexey Kardashevskiy <a...@ozlabs.ru>
---
hw/ppc/spapr.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index e0f7b54..9e187a1 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -630,9 +630,7 @@ static void spapr_populate_cpu_dt(CPUState *cs, void *fdt,
int offset,
uint32_t cpufreq = kvm_enabled() ? kvmppc_get_clockfreq() : 1000000000;
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)));
@@ -701,7 +699,7 @@ 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
