[PATCH] KVM: arm64: Increase number of memslots to 512

[linucherian at gmail.com]

From: Linu Cherian <linu.cherian at cavium.com>

Having only 32 memslots is a real constraint for the maximum number of
PCI devices that can be assigned to a single guest. Assuming each PCI
device/virtual function having two memory BAR regions, we could assign
only 15 devices/virtual functions to a guest.

So increase KVM_MEM_SLOTS_NUM to 512 as done in other archs like x86 and
powerpc. For this, KVM_USER_MEM_SLOTS has been changed to 508.

Signed-off-by: Linu Cherian <linu.cherian at cavium.com>
---
 arch/arm/kvm/arm.c                | 3 +++
 arch/arm64/include/asm/kvm_host.h | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index 8f92efa..a19389b 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -221,6 +221,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 	case KVM_CAP_MAX_VCPUS:
 		r = KVM_MAX_VCPUS;
 		break;
+	case KVM_CAP_NR_MEMSLOTS:
+		r = KVM_USER_MEM_SLOTS;
+		break;
 	case KVM_CAP_MSI_DEVID:
 		if (!kvm)
 			r = -EINVAL;
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index e505038..88f017d 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -30,7 +30,7 @@
 
 #define __KVM_HAVE_ARCH_INTC_INITIALIZED
 
-#define KVM_USER_MEM_SLOTS 32
+#define KVM_USER_MEM_SLOTS 508
 #define KVM_PRIVATE_MEM_SLOTS 4
 #define KVM_COALESCED_MMIO_PAGE_OFFSET 1
 #define KVM_HALT_POLL_NS_DEFAULT 500000
-- 
1.9.1