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authorVitaly Kuznetsov <vkuznets@redhat.com>2021-01-28 13:01:31 -0500
committerPaolo Bonzini <pbonzini@redhat.com>2021-02-09 08:17:08 -0500
commit4fc096a99e01dd06dc55bef76ade7f8d76653245 (patch)
treed02ee91f59c3b01892a974066c6ee3f962dcee89 /arch/mips
parent281d9cd9b471a28382ac79be9b5cd59b72ae5c87 (diff)
downloadlinux-4fc096a99e01dd06dc55bef76ade7f8d76653245.tar.bz2
KVM: Raise the maximum number of user memslots
Current KVM_USER_MEM_SLOTS limits are arch specific (512 on Power, 509 on x86, 32 on s390, 16 on MIPS) but they don't really need to be. Memory slots are allocated dynamically in KVM when added so the only real limitation is 'id_to_index' array which is 'short'. We don't have any other KVM_MEM_SLOTS_NUM/KVM_USER_MEM_SLOTS-sized statically defined structures. Low KVM_USER_MEM_SLOTS can be a limiting factor for some configurations. In particular, when QEMU tries to start a Windows guest with Hyper-V SynIC enabled and e.g. 256 vCPUs the limit is hit as SynIC requires two pages per vCPU and the guest is free to pick any GFN for each of them, this fragments memslots as QEMU wants to have a separate memslot for each of these pages (which are supposed to act as 'overlay' pages). Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Message-Id: <20210127175731.2020089-3-vkuznets@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/mips')
-rw-r--r--arch/mips/include/asm/kvm_host.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
index 24f3d0f9996b..3a5612e7304c 100644
--- a/arch/mips/include/asm/kvm_host.h
+++ b/arch/mips/include/asm/kvm_host.h
@@ -83,7 +83,6 @@
#define KVM_MAX_VCPUS 16
-#define KVM_USER_MEM_SLOTS 16
/* memory slots that does not exposed to userspace */
#define KVM_PRIVATE_MEM_SLOTS 0