Re: [Qemu-devel] [QEMU-PPC] [PATCH 00/13] target/ppc: Implement KVM support under TCG

[David Gibson <david@gibson.dropbear.id.au>]

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On Fri, May 03, 2019 at 03:53:03PM +1000, Suraj Jitindar Singh wrote:
> This patch series adds the necessary parts so that a tcg guest is able to use
> kvm facilities. That is a tcg guest can boot its own kvm guests.

The topic line is a bit hard to parse.  IIUC there are basically two
things in this series:

1) Implement / fix TCG emulation of TCG hypervisor facilities, so that
   a TCG powernv machine can use them to run KVM guests.

2) Have the pseries machine under TCG implement the paravirtualized
   interfaces to allow nested virtualizationm therefore allowing TCG
   pseries machines to run KVM guests

Is that right?

> The main requirements for this were a few registers and instructions as well as
> some hcalls and the addition of partition scoped translation in the radix mmu
> emulation.
> 
> This can be used to boot a kvm guest under a pseries tcg guest:
> Use power9_v2.2 cpu and add -machine cap-nested-hv=on for the first guest.
> Then inside that guest boot a kvm guest as normal.
> This takes advantage of the new hcalls with qemu emulating them as a normal
> hypervisor would on a real machine.
> 
> This can also be used to boot a kvm guest under a powernv tcg guest:
> Use any power9 cpu type.
> This takes advantage of the new hv register access added.
> Note that for powernv there is no xive interrupt excalation for KVM which means
> that while the guest will boot, it won't receive any interrupts.
> 
> Suraj Jitindar Singh (13):
>   target/ppc: Implement the VTB for HV access
>   target/ppc: Work [S]PURR implementation and add HV support
>   target/ppc: Add SPR ASDR
>   target/ppc: Add SPR TBU40
>   target/ppc: Add privileged message send facilities
>   target/ppc: Enforce that the root page directory size must be at least
>     5
>   target/ppc: Handle partition scoped radix tree translation
>   target/ppc: Implement hcall H_SET_PARTITION_TABLE
>   target/ppc: Implement hcall H_ENTER_NESTED
>   target/ppc: Implement hcall H_TLB_INVALIDATE
>   target/ppc: Implement hcall H_COPY_TOFROM_GUEST
>   target/ppc: Introduce POWER9 DD2.2 cpu type
>   target/ppc: Enable SPAPR_CAP_NESTED_KVM_HV under tcg
> 
>  hw/ppc/ppc.c                    |  46 ++++-
>  hw/ppc/spapr_caps.c             |  22 ++-
>  hw/ppc/spapr_cpu_core.c         |   1 +
>  hw/ppc/spapr_hcall.c            | 409 +++++++++++++++++++++++++++++++++++++++
>  include/hw/ppc/ppc.h            |   4 +-
>  include/hw/ppc/spapr.h          |   7 +-
>  linux-user/ppc/cpu_loop.c       |   5 +
>  target/ppc/cpu-models.c         |   2 +
>  target/ppc/cpu-models.h         |   1 +
>  target/ppc/cpu.h                |  70 +++++++
>  target/ppc/excp_helper.c        |  79 +++++++-
>  target/ppc/helper.h             |   9 +
>  target/ppc/misc_helper.c        |  46 +++++
>  target/ppc/mmu-radix64.c        | 412 ++++++++++++++++++++++++++++------------
>  target/ppc/mmu-radix64.h        |   4 +
>  target/ppc/timebase_helper.c    |  20 ++
>  target/ppc/translate.c          |  28 +++
>  target/ppc/translate_init.inc.c | 107 +++++++++--
>  18 files changed, 1115 insertions(+), 157 deletions(-)
> 

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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