linux-kernel - [RFC kvmtool 09/10] riscv: Don't emit MMIO devices for CoVE VM.

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Date:   Wed, 19 Apr 2023 15:23:49 -0700
From:   Atish Patra <atishp@...osinc.com>
To:     linux-kernel@...r.kernel.org
Cc:     Rajnesh Kanwal <rkanwal@...osinc.com>,
        Alexandre Ghiti <alex@...ti.fr>,
        Andrew Jones <ajones@...tanamicro.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...shpatra.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        linux-coco@...ts.linux.dev, Dylan Reid <dylan@...osinc.com>,
        abrestic@...osinc.com, Samuel Ortiz <sameo@...osinc.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        kvm-riscv@...ts.infradead.org, kvm@...r.kernel.org,
        linux-mm@...ck.org, linux-riscv@...ts.infradead.org,
        Palmer Dabbelt <palmer@...belt.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Uladzislau Rezki <urezki@...il.com>
Subject: [RFC kvmtool 09/10] riscv: Don't emit MMIO devices for CoVE VM.

From: Rajnesh Kanwal <rkanwal@...osinc.com>

The CoVE VMs do not support MMIO devices yet. Do not emit
MMIO device nodes for CoVE VMs.

Signed-off-by: Rajnesh Kanwal <rkanwal@...osinc.com>
---
 riscv/fdt.c | 33 ++++++++++++++++++---------------
 1 file changed, 18 insertions(+), 15 deletions(-)

diff --git a/riscv/fdt.c b/riscv/fdt.c
index 07ec336..a7d32b3 100644
--- a/riscv/fdt.c
+++ b/riscv/fdt.c
@@ -210,22 +210,25 @@ static int setup_fdt(struct kvm *kvm)
 			       riscv_irqchip_phandle));
 	_FDT(fdt_property(fdt, "ranges", NULL, 0));
 
-	/* Virtio MMIO devices */
-	dev_hdr = device__first_dev(DEVICE_BUS_MMIO);
-	while (dev_hdr) {
-		generate_mmio_fdt_nodes = dev_hdr->data;
-		generate_mmio_fdt_nodes(fdt, dev_hdr,
-					riscv__generate_irq_prop);
-		dev_hdr = device__next_dev(dev_hdr);
-	}
+	/* CoVE VMs do not support MMIO devices yet */
+	if (!kvm->cfg.arch.cove_vm) {
+		/* Virtio MMIO devices */
+		dev_hdr = device__first_dev(DEVICE_BUS_MMIO);
+		while (dev_hdr) {
+			generate_mmio_fdt_nodes = dev_hdr->data;
+			generate_mmio_fdt_nodes(fdt, dev_hdr,
+						riscv__generate_irq_prop);
+			dev_hdr = device__next_dev(dev_hdr);
+		}
 
-	/* IOPORT devices */
-	dev_hdr = device__first_dev(DEVICE_BUS_IOPORT);
-	while (dev_hdr) {
-		generate_mmio_fdt_nodes = dev_hdr->data;
-		generate_mmio_fdt_nodes(fdt, dev_hdr,
-					riscv__generate_irq_prop);
-		dev_hdr = device__next_dev(dev_hdr);
+		/* IOPORT devices */
+		dev_hdr = device__first_dev(DEVICE_BUS_IOPORT);
+		while (dev_hdr) {
+			generate_mmio_fdt_nodes = dev_hdr->data;
+			generate_mmio_fdt_nodes(fdt, dev_hdr,
+						riscv__generate_irq_prop);
+			dev_hdr = device__next_dev(dev_hdr);
+		}
 	}
 
 	/* PCI host controller */
-- 
2.25.1