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'bhyve' was developed by grehan@ and myself at NetApp (thanks!).
Special thanks to Peter Snyder, Joe Caradonna and Michael Dexter for their
support and encouragement.
Obtained from: NetApp
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During the early days of bhyve it did not support instruction emulation
which necessitated the use of x2apic to access the local apic. This is no
longer the case and the dependency on x2apic has gone away.
The x2apic patches can be considered independently of bhyve and will be
merged into head via projects/x2apic.
Discussed with: grehan
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identical to the one in HEAD.
Obtained from: NetApp
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'GENERIC' works fine.
Obtained from: NetApp
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in <machine/cpufunc.h> so remove them from there.
Obtained from: NetApp
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the guest to execute real or unpaged protected mode code - bhyve relies on
this feature to execute the AP bootstrap code.
Get rid of the hack that allowed bhyve to support SMP guests on processors
that do not have the "unrestricted guest" capability. This hack was entirely
FreeBSD-specific and would not work with any other guest OS.
Instead, limit the number of vcpus to 1 when executing on processors without
"unrestricted guest" capability.
Suggested by: grehan
Obtained from: NetApp
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x2apic mode on the guest.
The guest can decide whether or not it wants to use legacy mmio or x2apic
access to the APIC by writing to the MSR_APICBASE register.
Obtained from: NetApp
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Provide a tunable 'machdep.x2apic_desired' to let the administrator override
the default behavior.
Provide a read-only sysctl 'machdep.x2apic' to let the administrator know
whether the kernel is using x2apic or legacy mmio to access local apic.
Tested with Parallels Desktop 8 and bhyve hypervisors.
Also tested running on bare metal Intel Xeon E5-2658.
Obtained from: NetApp
Discussed with: jhb, attilio, avg, grehan
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of group1 0x81 instructions that use the reg bits as an
extended opcode.
Still todo: properly update rflags.
Pointed out by: jilles@
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Pointed out by: emaste
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by clang in the local APIC code.
0x81 is a read-modify-write instruction - the EPT check
that only allowed read or write and not both has been
relaxed to allow read and write.
Reviewed by: neel
Obtained from: NetApp
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emulation is in place.
Obtained from: NetApp
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failure. The conversion from the return value to HANDLED or UNHANDLED can be
done locally in vmx_exit_process().
Obtained from: NetApp
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On a nested page table fault the hypervisor will:
- fetch the instruction using the guest %rip and %cr3
- decode the instruction in 'struct vie'
- emulate the instruction in host kernel context for local apic accesses
- any other type of mmio access is punted up to user-space (e.g. ioapic)
The decoded instruction is passed as collateral to the user-space process
that is handling the PAGING exit.
The emulation code is fleshed out to include more addressing modes (e.g. SIB)
and more types of operands (e.g. imm8). The source code is unified into a
single file (vmm_instruction_emul.c) that is compiled into vmm.ko as well
as /usr/sbin/bhyve.
Reviewed by: grehan
Obtained from: NetApp
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In the case where the underlying host had disabled MSI-X via the
"hw.pci.enable_msix" tunable, the ppt_setup_msix() function would fail
and return an error without properly cleaning up. This in turn would
cause a page fault on the next boot of the guest.
Fix this by calling ppt_teardown_msix() in all the error return paths.
Obtained from: NetApp
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integers.
Obtained from: NetApp
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Return 0's for now.
Reviewed by: neel
Obtained from: NetApp
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between inline asm statements that would in turn modify the flags
value set by the first asm, and used by the second.
Solve by making the common error block a string that can be pulled
into the first inline asm, and using symbolic labels for asm variables.
bhyve can now build/run fine when compiled with clang.
Reviewed by: neel
Obtained from: NetApp
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to vmcs_getreg(). Without this conversion vmcs_getreg() will return EINVAL.
In particular this prevented injection of the breakpoint exception into the
guest via the "-B" option to /usr/sbin/bhyve which is hugely useful when
debugging guest hangs.
This was broken in r241921.
Pointy hat: me
Obtained from: NetApp
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This state is independent of the type of hardware assist used so there is
really no need for it to be in Intel-specific code.
Obtained from: NetApp
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vm page allocators do. This fixes a panic when a virtio block
device is mounted as root, with the host system dying in
vm_page_dirty with invalid bits.
Reviewed by: neel
Obtained from: NetApp
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guest does a vm exit.
This allows us to trap any fpu access in the host context while the fpu still
has "dirty" state belonging to the guest.
Reported by: "s vas" on freebsd-virtualization@
Obtained from: NetApp
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host cpu to the scheduler until the guest is ready to run again.
This implies that the host cpu utilization will now closely mirror the actual
load imposed by the guest vcpu.
Also, the vcpu mutex now needs to be of type MTX_SPIN since we need to acquire
it inside a critical section.
Obtained from: NetApp
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to properly intercept it.
Obtained from: NetApp
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Also add a stats counter to count the number of NMIs delivered per vcpu.
Obtained from: NetApp
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If an IPI was delivered to this cpu before interrupts were disabled
then return right away via vmx_setjmp() with a return value of VMX_RETURN_AST.
Obtained from: NetApp
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This information will be used in conjunction with guest "HLT exiting" to
yield the thread hosting the virtual cpu.
Obtained from: NetApp
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the paging exit in preparation for a rework of
bhyve MMIO handling.
Reviewed by: neel
Obtained from: NetApp
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This also gets rid of all the witness.watch warnings related to calling
malloc(M_WAITOK) while holding a mutex.
Reviewed by: grehan
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destruction for calling malloc() with M_WAITOK while holding a mutex.
Do not allow vmm.ko to be unloaded until all virtual machines are destroyed.
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Prior to this change the MSI was being delivered unconditionally to vcpu 0
regardless of how the guest programmed the MSI delivery.
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It is no longer necessary to hard-partition the memory between the host
and guests at boot time.
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chunks. This breaks the assumption that the entire memory segment is
contiguously allocated in the host physical address space.
This also paves the way to satisfy the 4KB page allocations by requesting
free pages from the VM subsystem as opposed to hard-partitioning host memory
at boot time.
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associated with guest physical memory is contiguous.
Add check to vm_gpa2hpa() that the range indicated by [gpa,gpa+len) is all
contained within a single 4KB page.
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associated with guest physical memory is contiguous.
Rewrite vm_gpa2hpa() to get the GPA to HPA mapping by querying the nested
page tables.
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associated with guest physical memory is contiguous.
In this case vm_malloc() was using vm_gpa2hpa() to indirectly infer whether
or not the address range had already been allocated.
Replace this instead with an explicit API 'vm_gpa_available()' that returns
TRUE if a page is available for allocation in guest physical address space.
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page table fault. Use this when fetching the instruction bytes from the guest
memory.
Also modify the lapic_mmio() API so that a decoded instruction is fed into it
instead of having it fetch the instruction bytes from the guest. This is
useful for hardware assists like SVM that provide the faulting instruction
as part of the vmexit.
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default X2APIC mode to the guest.
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The default behavior is still to present the local apic to the guest in the
x2apic mode.
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the guest.
At the moment this simply sets the state in the 'vcpu' instance but there is
no code that acts upon these settings.
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AP needs to be activated by spinning up an execution context for it.
The local apic emulation is now completely done in the hypervisor and it will
detect writes to the ICR_LO register that try to bring up the AP. In response
to such writes it will return to userspace with an exit code of SPINUP_AP.
Reviewed by: grehan
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