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Commit b74a07be authored by Avi Kivity's avatar Avi Kivity
Browse files

KVM: Remove kernel-allocated memory regions 



Equivalent (and better) functionality is provided by user-allocated memory
regions.

Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent a1f4d395

Documentation/feature-removal-schedule.txt

+0 −10
Original line number Diff line number Diff line
@@ -548,16 +548,6 @@ Who: John Stultz <johnstul@us.ibm.com> 


----------------------------



What:	KVM kernel-allocated memory slots

When:	July 2010

Why:	Since 2.6.25, kvm supports user-allocated memory slots, which are

	much more flexible than kernel-allocated slots.  All current userspace

	supports the newer interface and this code can be removed with no

	impact.

Who:	Avi Kivity <avi@redhat.com>



----------------------------



What:	KVM paravirt mmu host support

When:	January 2011

Why:	The paravirt mmu host support is slower than non-paravirt mmu, both

Documentation/kvm/api.txt

+1 −23
Original line number Diff line number Diff line
@@ -160,29 +160,7 @@ Type: vm ioctl 
Parameters: struct kvm_memory_region (in)

Returns: 0 on success, -1 on error



struct kvm_memory_region {

	__u32 slot;

	__u32 flags;

	__u64 guest_phys_addr;

	__u64 memory_size; /* bytes */

};



/* for kvm_memory_region::flags */

#define KVM_MEM_LOG_DIRTY_PAGES  1UL



This ioctl allows the user to create or modify a guest physical memory

slot.  When changing an existing slot, it may be moved in the guest

physical memory space, or its flags may be modified.  It may not be

resized.  Slots may not overlap.



The flags field supports just one flag, KVM_MEM_LOG_DIRTY_PAGES, which

instructs kvm to keep track of writes to memory within the slot.  See

the KVM_GET_DIRTY_LOG ioctl.



It is recommended to use the KVM_SET_USER_MEMORY_REGION ioctl instead

of this API, if available.  This newer API allows placing guest memory

at specified locations in the host address space, yielding better

control and easy access.

This ioctl is obsolete and has been removed.



4.6 KVM_CREATE_VCPU

arch/x86/kvm/x86.c

+0 −16
Original line number Diff line number Diff line
@@ -2967,22 +2967,6 @@ long kvm_arch_vm_ioctl(struct file *filp, 
			goto out;

		break;

	}

	case KVM_SET_MEMORY_REGION: {

		struct kvm_memory_region kvm_mem;

		struct kvm_userspace_memory_region kvm_userspace_mem;



		r = -EFAULT;

		if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))

			goto out;

		kvm_userspace_mem.slot = kvm_mem.slot;

		kvm_userspace_mem.flags = kvm_mem.flags;

		kvm_userspace_mem.guest_phys_addr = kvm_mem.guest_phys_addr;

		kvm_userspace_mem.memory_size = kvm_mem.memory_size;

		r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 0);

		if (r)

			goto out;

		break;

	}

	case KVM_SET_NR_MMU_PAGES:

		r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);

		if (r)