Commit 70295a47 authored by Paolo Bonzini's avatar Paolo Bonzini
Browse files

KVM: always define KVM_CAP_SYNC_MMU 



KVM_CAP_SYNC_MMU is provided by KVM's MMU notifiers, which are now always
available.  Move the definition from individual architectures to common
code.

Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 407fd8b8

Documentation/virt/kvm/api.rst

+4 −6
Original line number Diff line number Diff line
@@ -1396,7 +1396,10 @@ or its flags may be modified, but it may not be resized. 
Memory for the region is taken starting at the address denoted by the

field userspace_addr, which must point at user addressable memory for

the entire memory slot size.  Any object may back this memory, including

anonymous memory, ordinary files, and hugetlbfs.

anonymous memory, ordinary files, and hugetlbfs.  Changes in the backing

of the memory region are automatically reflected into the guest.

For example, an mmap() that affects the region will be made visible

immediately.  Another example is madvise(MADV_DROP).



On architectures that support a form of address tagging, userspace_addr must

be an untagged address.
@@ -1412,11 +1415,6 @@ use it. The latter can be set, if KVM_CAP_READONLY_MEM capability allows it, 
to make a new slot read-only.  In this case, writes to this memory will be

posted to userspace as KVM_EXIT_MMIO exits.



When the KVM_CAP_SYNC_MMU capability is available, changes in the backing of

the memory region are automatically reflected into the guest.  For example, an

mmap() that affects the region will be made visible immediately.  Another

example is madvise(MADV_DROP).



For TDX guest, deleting/moving memory region loses guest memory contents.

Read only region isn't supported.  Only as-id 0 is supported.

arch/arm64/kvm/arm.c

+0 −1
Original line number Diff line number Diff line
@@ -358,7 +358,6 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) 
		break;

	case KVM_CAP_IOEVENTFD:

	case KVM_CAP_USER_MEMORY:

	case KVM_CAP_SYNC_MMU:

	case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:

	case KVM_CAP_ONE_REG:

	case KVM_CAP_ARM_PSCI:

arch/loongarch/kvm/vm.c

+0 −1
Original line number Diff line number Diff line
@@ -118,7 +118,6 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) 
	case KVM_CAP_ONE_REG:

	case KVM_CAP_ENABLE_CAP:

	case KVM_CAP_READONLY_MEM:

	case KVM_CAP_SYNC_MMU:

	case KVM_CAP_IMMEDIATE_EXIT:

	case KVM_CAP_IOEVENTFD:

	case KVM_CAP_MP_STATE:

arch/mips/kvm/mips.c

+0 −1
Original line number Diff line number Diff line
@@ -1035,7 +1035,6 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) 
	case KVM_CAP_ONE_REG:

	case KVM_CAP_ENABLE_CAP:

	case KVM_CAP_READONLY_MEM:

	case KVM_CAP_SYNC_MMU:

	case KVM_CAP_IMMEDIATE_EXIT:

		r = 1;

		break;

arch/powerpc/kvm/powerpc.c

+0 −5
Original line number Diff line number Diff line
@@ -623,11 +623,6 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) 
		r = !!(hv_enabled && kvmppc_hv_ops->enable_nested &&

		       !kvmppc_hv_ops->enable_nested(NULL));

		break;

#endif

	case KVM_CAP_SYNC_MMU:

		r = 1;

		break;

#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE

	case KVM_CAP_PPC_HTAB_FD:

		r = hv_enabled;

		break;