[PATCH 00/14] KVM GICv3 emulation
andre.przywara at arm.com
Fri Jun 20 01:20:31 PDT 2014
On 20/06/14 02:39, Chalamarla, Tirumalesh wrote:
> 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
to get all of GICv3 host, vgic-dyn and the GICv3 guest emualation stuff
> 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).
> 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
> kvmarm mailing list
> kvmarm at lists.cs.columbia.edu
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