Subject: [PATCH v2 18/54] KVM: arm/arm64: vgic-new: Add GICv3 world switch backend

From: [email-masked] (Marc Zyngier)
Date: Tue, 3 May 2016 17:16:28 +0100

On 28/04/16 17:45, Andre Przywara wrote:
> From: Marc Zyngier <[email-masked]>
> 
> As the GICv3 virtual interface registers differ from their GICv2
> siblings, we need different handlers for processing maintenance
> interrupts and reading/writing to the LRs.
> Implement the respective handler functions and connect them to
> existing code to be called if the host is using a GICv3.
> 
> Signed-off-by: Marc Zyngier <[email-masked]>
> Signed-off-by: Andre Przywara <[email-masked]>
> ---
> Changelog RFC..v1:
> - remove outdated comment about the dist_lock
> - add WARN_ON about LR_STATE not being 0 in maintenance interrupts
> 
> Changelog v1 .. v2:
> - inject the IRQ priority into the list register
> 
>  include/linux/irqchip/arm-gic-v3.h |   1 +
>  virt/kvm/arm/vgic/vgic-v3.c        | 169 +++++++++++++++++++++++++++++++++++++
>  virt/kvm/arm/vgic/vgic.c           |  25 ++++--
>  virt/kvm/arm/vgic/vgic.h           |  29 +++++++
>  4 files changed, 219 insertions(+), 5 deletions(-)
>  create mode 100644 virt/kvm/arm/vgic/vgic-v3.c
> 
> diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h
> index d5d798b..56fd2c5 100644
> --- a/include/linux/irqchip/arm-gic-v3.h
> +++ b/include/linux/irqchip/arm-gic-v3.h
> @@ -275,6 +275,7 @@
>  #define ICH_LR_ACTIVE_BIT		(1ULL << 63)
>  #define ICH_LR_PHYS_ID_SHIFT		32
>  #define ICH_LR_PHYS_ID_MASK		(0x3ffULL << ICH_LR_PHYS_ID_SHIFT)
> +#define ICH_LR_PRIORITY_SHIFT		48
>  
>  #define ICH_MISR_EOI			(1 << 0)
>  #define ICH_MISR_U			(1 << 1)
> diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c
> new file mode 100644
> index 0000000..461229b
> --- /dev/null
> +++ b/virt/kvm/arm/vgic/vgic-v3.c
> @@ -0,0 +1,169 @@
> +/*
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program. If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/irqchip/arm-gic-v3.h>
> +#include <linux/kvm.h>
> +#include <linux/kvm_host.h>
> +#include <linux/irqchip/arm-gic.h>

This last line is definitely a (copy-paste) bug. We should never include
both GIC headers in the same file. Can you please drop that line and
have the following hunk instead?

+/* These are for GICv2 emulation only */
+#define GICH_LR_VIRTUALID		(0x3ffUL << 0)
+#define GICH_LR_PHYSID_CPUID_SHIFT	(10)
+#define GICH_LR_PHYSID_CPUID		(7UL << GICH_LR_PHYSID_CPUID_SHIFT)
+#define ICH_LR_VIRTUALID_MASK		(BIT_ULL(32) - 1)
+

which is similar to what we have in the old implementation, for the
exact same reason.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...