Let userspace inquire the maximum physical address width
of the host processors; this can be used to identify maximum
memory that can be assigned to the guest.
Reported-by: Laszlo Ersek <lersek@xxxxxxxxxx>
Signed-off-by: Bandan Das <bsd@xxxxxxxxxx>
---
arch/x86/kvm/x86.c | 3 +++
include/uapi/linux/kvm.h | 1 +
2 files changed, 4 insertions(+)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index bbaf44e..97d6746 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2683,6 +2683,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_NR_MEMSLOTS:
r = KVM_USER_MEM_SLOTS;
break;
+ case KVM_CAP_PHY_ADDR_WIDTH:
+ r = boot_cpu_data.x86_phys_bits;
+ break;
case KVM_CAP_PV_MMU: /* obsolete */
r = 0;
break;
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 716ad4a..e7949a1 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -817,6 +817,7 @@ struct kvm_ppc_smmu_info {
#define KVM_CAP_DISABLE_QUIRKS 116
#define KVM_CAP_X86_SMM 117
#define KVM_CAP_MULTI_ADDRESS_SPACE 118
+#define KVM_CAP_PHY_ADDR_WIDTH 119
#ifdef KVM_CAP_IRQ_ROUTING
--
2.4.3
--
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