Only using 32 memslots for KVM on powerpc is way too low, you can
nowadays hit this limit quite fast by adding a couple of PCI devices
and/or pluggable memory DIMMs to the guest.
x86 already increased the limit to 512 in total, to satisfy 256
pluggable DIMM slots, 3 private slots and 253 slots for other things
like PCI devices. On powerpc, we only have 32 pluggable DIMMs in
QEMU, not 256, so we likely do not as much slots as on x86. Thus
setting the slot limit to 320 sounds like a good value for the
time being (until we have some code in the future to resize the
memslot array dynamically).
And while we're at it, also remove the KVM_MEM_SLOTS_NUM definition
from the powerpc-specific header since this gets defined in the
generic kvm_host.h header anyway.

Signed-off-by: Thomas Huth <>
 arch/powerpc/include/asm/kvm_host.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/kvm_host.h 
index 887c259..89d387a 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -38,8 +38,7 @@
 #define KVM_MAX_VCPUS          NR_CPUS
 #define KVM_MAX_VCORES         NR_CPUS
-#define KVM_USER_MEM_SLOTS 32
+#define KVM_USER_MEM_SLOTS 320

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