[PATCH 0/15] Hypervisor-mode KVM on POWER7 and PPC970

[Alexander Graf]

On 18.06.2011, at 10:27, Paul Mackerras wrote:

> The following series of patches enable KVM to exploit the hardware
> hypervisor mode on 64-bit Power ISA Book3S machines.  At present,
> POWER7 and PPC970 processors are supported.  (Note that the PPC970
> processors in Apple G5 machines don't have a usable hypervisor mode
> and are not supported by these patches.)
> 
> Running the KVM host in hypervisor mode means that the guest can use
> both supervisor mode and user mode.  That means that the guest can
> execute supervisor-privilege instructions and access supervisor-
> privilege registers.  In addition the hardware directs most exceptions
> to the guest.  Thus we don't need to emulate any instructions in the
> host.  Generally, the only times we need to exit the guest are when it
> does a hypercall or when an external interrupt or host timer
> (decrementer) interrupt occurs.
> 
> The focus of this KVM implementation is to run guests that use the
> PAPR (Power Architecture Platform Requirements) paravirtualization
> interface, which is the interface supplied by PowerVM on IBM pSeries
> machines.  Currently the "pseries" machine type in qemu is only
> supported by book3s_hv KVM, and book3s_hv KVM only supports the
> "pseries" machine type.  That will hopefully change in future.
> 
> These patches are against Alex Graf's kvm-ppc-next branch.

I just applied them on top of kvm-ppc-next and started compiling for book3s_64_pr=M:

arch/powerpc/kernel/exceptions-64s.S: Assembler messages:
arch/powerpc/kernel/exceptions-64s.S:314: Error: undefined symbol `PACA_KVM_SVCPU' in operation
arch/powerpc/kernel/exceptions-64s.S:314: Error: undefined symbol `SVCPU_IN_GUEST' in operation
make[1]: *** [arch/powerpc/kernel/head_64.o] Error 1
make: *** [arch/powerpc/kernel] Error 2


Alex