[PATCH 00/14] KVM GICv3 emulation

Fri Jun 20 01:20:31 PDT 2014

On 20/06/14 02:39, Chalamarla, Tirumalesh wrote:

Hi Tirumalesh,

>  Is there a public repo where we can get this patches from easily.

Indeed, many thanks to Marc who hosts now my patches on his kernel.org
repo. Simply checkout the gicv3/kvm-guest branch from
git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git
to get all of GICv3 host, vgic-dyn and the GICv3 guest emualation stuff
at once.

Regards,
Andre.

> ________________________________________
> From: kvmarm-bounces at lists.cs.columbia.edu <kvmarm-bounces at lists.cs.columbia.edu> on behalf of Andre Przywara <andre.przywara at arm.com>
> Sent: Thursday, June 19, 2014 3:15 PM
> To: linux-arm-kernel at lists.infradead.org; kvmarm at lists.cs.columbia.edu; kvm at vger.kernel.org
> Cc: christoffer.dall at linaro.org
> Subject: [PATCH 00/14] KVM GICv3 emulation
>
> GICv3 is the ARM generic interrupt controller designed to overcome
> some limits of the prevalent GICv2. Most notably it lifts the 8-CPU
> limit. Though with recent patches from Marc there is support for
> hosts to use a GICv3, the CPU limitation still applies to KVM guests,
> since the current code emulates a GICv2 only.
> Also, GICv2 backward compatibility being optional in GICv3, a number
> of systems won't be able to run GICv2 guests.
>
> This patch series provides code to emulate a GICv3 distributor and
> redistributor for any KVM guest. It requires a GICv3 in the host to
> work. With those patches one can run guests efficiently on any GICv3
> host. It has the following features:
> - Affinity routing (support for up to 255 VCPUs, more possible)
> - System registers (as opposed to MMIO access)
> - No ITS
> - No priority support (as the GICv2 emulation)
> - No save / restore support so far (will be added soon)
>
> The first 10 patches actually refactor the current VGIC code to make
> room for a different VGIC model to be dropped in with Patch 11/14.
> The remaining patches connect the new model to the kernel backend and
> the userland facing code.
>
> The series goes on top of both Marc's GICv3 host support series as
> well as his vgic-dyn patches.
> The necessary patches for kvmtool to enable the guest's GICv3 will be
> posted here as well.
> There was some testing on the fast model with some I/O and interrupt
> affinity shuffling in a Linux guest with a varying number of VCPUs.
>
> Please review and test.
> I would be grateful for people to test for GICv2 regressions also
> (so on a GICv2 host with current kvmtool/qemu), as there is quite
> some refactoring on that front.
>
> Much of the code was inspired by Marc, so send all praises to him
> (while I take the blame).
>
> Cheers,
> Andre.
>
> Andre Przywara (14):
>   arm/arm64: KVM: rework MPIDR assignment and add accessors
>   arm/arm64: KVM: pass down user space provided GIC type into vGIC code
>   arm/arm64: KVM: refactor vgic_handle_mmio() function
>   arm/arm64: KVM: wrap 64 bit MMIO accesses with two 32 bit ones
>   arm/arm64: KVM: introduce per-VM ops
>   arm/arm64: KVM: make the maximum number of vCPUs a per-VM value
>   arm/arm64: KVM: make the value of ICC_SRE_EL1 a per-VM variable
>   arm/arm64: KVM: refactor MMIO accessors
>   arm/arm64: KVM: split GICv2 specific emulation code from vgic.c
>   arm/arm64: KVM: add opaque private pointer to MMIO accessors
>   arm/arm64: KVM: add virtual GICv3 distributor emulation
>   arm/arm64: KVM: add SGI system register trapping
>   arm/arm64: KVM: enable kernel side of GICv3 emulation
>   arm/arm64: KVM: allow userland to request a virtual GICv3
>
>  arch/arm/include/asm/kvm_emulate.h   |    2 +-
>  arch/arm/include/asm/kvm_host.h      |    3 +
>  arch/arm/kvm/Makefile                |    1 +
>  arch/arm/kvm/arm.c                   |   23 +-
>  arch/arm/kvm/coproc.c                |   19 +
>  arch/arm/kvm/psci.c                  |   15 +-
>  arch/arm64/include/asm/kvm_emulate.h |    3 +-
>  arch/arm64/include/asm/kvm_host.h    |    5 +
>  arch/arm64/include/uapi/asm/kvm.h    |    7 +
>  arch/arm64/kernel/asm-offsets.c      |    1 +
>  arch/arm64/kvm/Makefile              |    2 +
>  arch/arm64/kvm/sys_regs.c            |   37 +-
>  arch/arm64/kvm/vgic-v3-switch.S      |   14 +-
>  include/kvm/arm_vgic.h               |   38 +-
>  include/linux/irqchip/arm-gic-v3.h   |   26 +
>  include/linux/kvm_host.h             |    1 +
>  include/uapi/linux/kvm.h             |    1 +
>  virt/kvm/arm/vgic-v2-emul.c          |  802 +++++++++++++++++++++++++++
>  virt/kvm/arm/vgic-v2.c               |   22 +-
>  virt/kvm/arm/vgic-v3-emul.c          |  898 ++++++++++++++++++++++++++++++
>  virt/kvm/arm/vgic-v3.c               |  157 +++++-
>  virt/kvm/arm/vgic.c                  | 1017 +++++++---------------------------
>  virt/kvm/arm/vgic.h                  |  117 ++++
>  virt/kvm/kvm_main.c                  |    3 +
>  24 files changed, 2346 insertions(+), 868 deletions(-)
>  create mode 100644 virt/kvm/arm/vgic-v2-emul.c
>  create mode 100644 virt/kvm/arm/vgic-v3-emul.c
>  create mode 100644 virt/kvm/arm/vgic.h
>
> --
> 1.7.9.5
>
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