vmm: Consolidate code which manages guest memory regions

On all three platforms supported by vmm, we have mostly duplicated code
to manage guest physical memory regions. Deduplicate much of this co

vmm: Consolidate code which manages guest memory regions

On all three platforms supported by vmm, we have mostly duplicated code
to manage guest physical memory regions. Deduplicate much of this code
and move it into sys/dev/vmm/vmm_mem.c.

To avoid exporting struct vm outside of machdep vmm.c, add a new
struct vm_mem to contain the memory segment descriptors, and add a
vm_mem() accessor, akin to vm_vmspace(). This way vmm_mem.c can
implement its routines without needing to see the layout of struct vm.

The handling of the per-VM vmspace is also duplicated but will be moved
to vmm_mem.c in a follow-up patch.

On amd64, move the ppt_is_mmio() check out of vm_mem_allocated() to keep
the code MI, as PPT is only implemented on amd64. There are only a
couple of callers, so this is not unreasonable.

No functional change intended.

Reviewed by: jhb
Differential Revision: https://reviews.freebsd.org/D48270

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arm64: Fix the VM_MAX_NAMELEN definition

The maximum VM name length has changed since the arm64 vmm code was
forked. For now, just sync with the amd64 definitions, since they
permit longer VM names

arm64: Fix the VM_MAX_NAMELEN definition

The maximum VM name length has changed since the arm64 vmm code was
forked. For now, just sync with the amd64 definitions, since they
permit longer VM names. As arm64/vmm is implemented only in main, I
won't bother dealing with backward compat.

Reviewed by: jhb
Differential Revision: https://reviews.freebsd.org/D46484

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arm64/vmm: Avoid unnecessary indirection in vmmops_modinit()

Most of vmm.h is machine-independent. Simplify merging amd64 and arm64
vmm code by removing this machine-dependent routine from arm64's

arm64/vmm: Avoid unnecessary indirection in vmmops_modinit()

Most of vmm.h is machine-independent. Simplify merging amd64 and arm64
vmm code by removing this machine-dependent routine from arm64's vmm.h.
No functional change intended.

Reviewed by: andrew
Differential Revision: https://reviews.freebsd.org/D45557

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arm64/vmm: Implement vm_disable_vcpu_creation()

No functional change intended.

Reviewed by: andrew
Differential Revision: https://reviews.freebsd.org/D45556

arm64/vmm: Add breakpoint and single-stepping support

This will be used to implement parts of bhyve's gdb stub.

Three VM capabilities are added, similar to amd64 without monitor mode.
Two cause bre

arm64/vmm: Add breakpoint and single-stepping support

This will be used to implement parts of bhyve's gdb stub.

Three VM capabilities are added, similar to amd64 without monitor mode.
Two cause breakpoint and single-step exceptions to be raised to EL2 and
then down to bhyve. One lets the gdb stub mask hardware interrupts
while single-stepping, since otherwise the guest will handle a timer
interrupt before executing the target instruction and thus fail
to make progress.

Reviewed by: bnovkov, andrew
Sponsored by: Innovate UK
Differential Revision: https://reviews.freebsd.org/D44739

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Import the kernel parts of bhyve/arm64

To support virtual machines on arm64 add the vmm code. This is based on
earlier work by Mihai Carabas and Alexandru Elisei at University
Politehnica of Buchare

Import the kernel parts of bhyve/arm64

To support virtual machines on arm64 add the vmm code. This is based on
earlier work by Mihai Carabas and Alexandru Elisei at University
Politehnica of Bucharest, with further work by myself and Mark Johnston.

All AArch64 CPUs should work, however only the GICv3 interrupt
controller is supported. There is initial support to allow the GICv2
to be supported in the future. Only pure Armv8.0 virtualisation is
supported, the Virtualization Host Extensions are not currently used.

With a separate userspace patch and U-Boot port FreeBSD guests are able
to boot to multiuser mode, and the hypervisor can be tested with the
kvm unit tests. Linux partially boots, but hangs before entering
userspace. Other operating systems are untested.

Sponsored by: Arm Ltd
Sponsored by: Innovate UK
Sponsored by: The FreeBSD Foundation
Sponsored by: University Politehnica of Bucharest
Differential Revision: https://reviews.freebsd.org/D37428

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