Re: [PATCH v2 5/7] virt: geniezone: Add irqchip support for virtual interrupt injection

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On 2023-04-28 11:36, Yi-De Wu wrote:
From: "Yingshiuan Pan" <yingshiuan.pan@xxxxxxxxxxxx>

Enable GenieZone to handle virtual interrupt injection request.

Signed-off-by: Yingshiuan Pan <yingshiuan.pan@xxxxxxxxxxxx>
Signed-off-by: Yi-De Wu <yi-de.wu@xxxxxxxxxxxx>
---
 arch/arm64/geniezone/Makefile       |  2 +-
 arch/arm64/geniezone/gzvm_arch.c    | 24 ++++++--
 arch/arm64/geniezone/gzvm_arch.h    | 11 ++++
 arch/arm64/geniezone/gzvm_irqchip.c | 88 +++++++++++++++++++++++++++++
 drivers/virt/geniezone/gzvm_vm.c    | 75 ++++++++++++++++++++++++
 include/linux/gzvm_drv.h            |  4 ++
 include/uapi/linux/gzvm.h           | 38 ++++++++++++-
 7 files changed, 235 insertions(+), 7 deletions(-)
 create mode 100644 arch/arm64/geniezone/gzvm_irqchip.c

[...]

+++ b/arch/arm64/geniezone/gzvm_irqchip.c
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2023 MediaTek Inc.
+ */
+
+#include <linux/irqchip/arm-gic-v3.h>
+#include <kvm/arm_vgic.h>

NAK.

There is no way you can rely on anything from KVM in
your own hypervisor code.

+
+#include <linux/gzvm.h>
+#include <linux/gzvm_drv.h>
+#include "gzvm_arch.h"
+
+/**
+ * gzvm_sync_vgic_state() - Check all LRs synced from gz hypervisor
+ *
+ * Traverse all LRs, see if any EOIed vint, notify_acked_irq if any.
+ * GZ does not fold/unfold everytime KVM_RUN, so we have to traverse all saved + * LRs. It will not takes much more time comparing to fold/unfold everytime
+ * GZVM_RUN, because there are only few LRs.
+ */
+void gzvm_sync_vgic_state(struct gzvm_vcpu *vcpu)
+{
+}
+
+/* is_irq_valid() - Check the irq number and irq_type are matched */
+static bool is_irq_valid(u32 irq, u32 irq_type)
+{
+	switch (irq_type) {
+	case GZVM_IRQ_TYPE_CPU:
+		/*  0 ~ 15: SGI */
+		if (likely(irq <= GZVM_IRQ_CPU_FIQ))
+			return true;
+		break;
+	case GZVM_IRQ_TYPE_PPI:
+		/* 16 ~ 31: PPI */
+		if (likely(irq >= VGIC_NR_SGIS && irq < VGIC_NR_PRIVATE_IRQS))

What happens if I redefine all these macros tomorrow? None of
this code should rely on anything that is *INTERNAL* to KVM.

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



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