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| author | David Gibson <david@gibson.dropbear.id.au> | 2016-12-09 01:07:37 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-02-10 03:28:01 +0100 |
| commit | 0de0fb09bbce1e1635a0d4c4781af6ec8cbfdb81 (patch) | |
| tree | 539c4d718226b4130495e5ad626ca0b118ae6dfa /arch/powerpc/kernel/prom_init.c | |
| parent | powerpc/pseries: Add support for hash table resizing (diff) | |
| download | linux-0de0fb09bbce1e1635a0d4c4781af6ec8cbfdb81.tar.xz linux-0de0fb09bbce1e1635a0d4c4781af6ec8cbfdb81.zip | |
powerpc/pseries: Advertise HPT resizing support via CAS
The hypervisor needs to know a guest is capable of using the HPT resizing
PAPR extension in order to make full advantage of it for memory hotplug.
If the hypervisor knows the guest is HPT resize aware, it can size the
initial HPT based on the initial guest RAM size, relying on the guest to
resize the HPT when more memory is hot-added. Without this, the hypervisor
must size the HPT for the maximum possible guest RAM, which can lead to
a huge waste of space if the guest never actually expends to that maximum
size.
This patch advertises the guest's support for HPT resizing via the
ibm,client-architecture-support OF interface. We use bit 5 of byte 6 of
option vector 5 for this purpose, as defined in the PAPR ACR "HPT
resizing option".
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Reviewed-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/prom_init.c')
| -rw-r--r-- | arch/powerpc/kernel/prom_init.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c index ec47a939cbdd..d16b0f005290 100644 --- a/arch/powerpc/kernel/prom_init.c +++ b/arch/powerpc/kernel/prom_init.c @@ -826,7 +826,7 @@ struct ibm_arch_vec __cacheline_aligned ibm_architecture_vec = { 0, #endif .associativity = OV5_FEAT(OV5_TYPE1_AFFINITY) | OV5_FEAT(OV5_PRRN), - .bin_opts = 0, + .bin_opts = OV5_FEAT(OV5_RESIZE_HPT), .micro_checkpoint = 0, .reserved0 = 0, .max_cpus = cpu_to_be32(NR_CPUS), /* number of cores supported */ |