On 10/05/16 16:28, Eric Auger wrote:

On 05/06/2016 12:45 PM, Andre Przywara wrote:

quoted

From: Marc Zyngier <redacted>

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 <redacted>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
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- remove outdated comment about the dist_lock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

Changelog v2 .. v3:
- remove no longer needed irqchip/arm-gic.h inclusion

 include/linux/irqchip/arm-gic-v3.h |   1 +
 virt/kvm/arm/vgic/vgic-v3.c        | 168 +++++++++++++++++++++++++++++++++++++
 virt/kvm/arm/vgic/vgic.c           |  25 ++++--
 virt/kvm/arm/vgic/vgic.h           |  29 +++++++
 4 files changed, 218 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 ec938d1..35e93cf 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
 
 /* These are for GICv2 emulation only */
 #define GICH_LR_VIRTUALID		(0x3ffUL << 0)

diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c
new file mode 100644
index 0000000..43d1dd7
--- /dev/null
+++ b/virt/kvm/arm/vgic/vgic-v3.c

@@ -0,0 +1,168 @@
+/*
+ * 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 "vgic.h"
+
+void vgic_v3_process_maintenance(struct kvm_vcpu *vcpu)
+{
+	struct vgic_v3_cpu_if *cpuif = &vcpu->arch.vgic_cpu.vgic_v3;
+	u32 model = vcpu->kvm->arch.vgic.vgic_model;
+
+	if (cpuif->vgic_misr & ICH_MISR_EOI) {
+		unsigned long eisr_bmap = cpuif->vgic_eisr;
+		int lr;
+
+		for_each_set_bit(lr, &eisr_bmap, kvm_vgic_global_state.nr_lr) {

used_lrs?

Indeed.

quoted

+			u32 intid;
+			u64 val = cpuif->vgic_lr[lr];
+
+			if (model == KVM_DEV_TYPE_ARM_VGIC_V3)
+				intid = val & ICH_LR_VIRTUAL_ID_MASK;
+			else
+				intid = val & GICH_LR_VIRTUALID;
+
+			WARN_ON(cpuif->vgic_lr[lr] & ICH_LR_STATE);
+
+			kvm_notify_acked_irq(vcpu->kvm, 0,
+					     intid - VGIC_NR_PRIVATE_IRQS);
+
+			cpuif->vgic_elrsr |= 1ULL << lr;
+		}
+
+		/*
+		 * In the next iterations of the vcpu loop, if we sync
+		 * the vgic state after flushing it, but before
+		 * entering the guest (this happens for pending
+		 * signals and vmid rollovers), then make sure we
+		 * don't pick up any old maintenance interrupts here.
+		 */
+		cpuif->vgic_eisr = 0;
+	}
+
+	cpuif->vgic_hcr &= ~ICH_HCR_UIE;
+}
+
+void vgic_v3_set_underflow(struct kvm_vcpu *vcpu)
+{
+	struct vgic_v3_cpu_if *cpuif = &vcpu->arch.vgic_cpu.vgic_v3;
+
+	cpuif->vgic_hcr |= ICH_HCR_UIE;
+}
+
+void vgic_v3_fold_lr_state(struct kvm_vcpu *vcpu)
+{
+	struct vgic_v3_cpu_if *cpuif = &vcpu->arch.vgic_cpu.vgic_v3;
+	u32 model = vcpu->kvm->arch.vgic.vgic_model;
+	int lr;
+
+	/* Assumes ap_list_lock held */

I don't think there is such requirement and failed finding the lock held.

This looks like a leftover from a previous version. Folding the state is
done on a per-irq basis, and doesn't require to parse the ap_list.

Besides Reviewed-by: Eric Auger [off-list ref]

Thanks,

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