From patchwork Mon Aug 5 11:18:12 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Maydell X-Patchwork-Id: 18775 Return-Path: X-Original-To: linaro@patches.linaro.org Delivered-To: linaro@patches.linaro.org Received: from mail-ve0-f197.google.com (mail-ve0-f197.google.com [209.85.128.197]) by ip-10-151-82-157.ec2.internal (Postfix) with ESMTPS id 199352486D for ; Mon, 5 Aug 2013 11:18:16 +0000 (UTC) Received: by mail-ve0-f197.google.com with SMTP id ox1sf4484354veb.4 for ; Mon, 05 Aug 2013 04:18:15 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:x-beenthere:x-forwarded-to:x-forwarded-for :delivered-to:from:to:cc:subject:date:message-id:x-mailer :in-reply-to:references:x-gm-message-state:x-removed-original-auth :x-original-sender:x-original-authentication-results:precedence :mailing-list:list-id:x-google-group-id:list-post:list-help :list-archive:list-unsubscribe; bh=hvSrH1j2MspLRrZ/M6QUky8AnyYWWyuAEpBpjAog8ZQ=; b=h1JBL30E8qTVn/g7mPQUW7WUrT6HNLCgfBm02vse/Qa6ev/xcRbI+tWuGB36NDxHZK vFGdUWEEI1I7dNYsyNKgwbecJh0Nc8OLdWdkF9Mv8i0WkIazuWakf7VbKLyq8N+8z5z4 g1iu1BDHuZ+Wx8PL6iRL7ALNtTw335it3k4WIAQ8xjKiyWSAJkz7E2o6FIY8mIEaXzKe eMiqQ+beYJ9+yjWgIU7bLnu7D+Cs4oN4fXEeOxztEgQLvGyJ7kFEPeJ8XB7jD//Wo4cs MZOE6zMyTtReFjbruhsNmDAr7tr6Mg0O+Js6GZUdcZdxzgb0FTxJNWkM/y1cHWfZ0Up/ SAPg== X-Received: by 10.236.220.5 with SMTP id n5mr7992667yhp.21.1375701495818; Mon, 05 Aug 2013 04:18:15 -0700 (PDT) MIME-Version: 1.0 X-BeenThere: patchwork-forward@linaro.org Received: by 10.49.133.102 with SMTP id pb6ls2459939qeb.80.gmail; Mon, 05 Aug 2013 04:18:15 -0700 (PDT) X-Received: by 10.58.187.4 with SMTP id fo4mr5672967vec.55.1375701495723; Mon, 05 Aug 2013 04:18:15 -0700 (PDT) Received: from mail-vb0-f42.google.com (mail-vb0-f42.google.com [209.85.212.42]) by mx.google.com with ESMTPS id y4si4827350vej.37.2013.08.05.04.18.15 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 05 Aug 2013 04:18:15 -0700 (PDT) Received-SPF: neutral (google.com: 209.85.212.42 is neither permitted nor denied by best guess record for domain of patch+caf_=patchwork-forward=linaro.org@linaro.org) client-ip=209.85.212.42; Received: by mail-vb0-f42.google.com with SMTP id e12so2674763vbg.15 for ; Mon, 05 Aug 2013 04:18:15 -0700 (PDT) X-Received: by 10.58.154.34 with SMTP id vl2mr5731842veb.35.1375701495550; Mon, 05 Aug 2013 04:18:15 -0700 (PDT) X-Forwarded-To: patchwork-forward@linaro.org X-Forwarded-For: patch@linaro.org patchwork-forward@linaro.org Delivered-To: patches@linaro.org Received: by 10.221.11.8 with SMTP id pc8csp82627vcb; Mon, 5 Aug 2013 04:18:14 -0700 (PDT) X-Received: by 10.180.211.206 with SMTP id ne14mr6385033wic.30.1375701494321; Mon, 05 Aug 2013 04:18:14 -0700 (PDT) Received: from mnementh.archaic.org.uk (1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.d.1.0.0.b.8.0.1.0.0.2.ip6.arpa. [2001:8b0:1d0::1]) by mx.google.com with ESMTPS id gf11si7570398wic.36.2013.08.05.04.18.13 for (version=TLSv1.2 cipher=RC4-SHA bits=128/128); Mon, 05 Aug 2013 04:18:14 -0700 (PDT) Received-SPF: neutral (google.com: 2001:8b0:1d0::1 is neither permitted nor denied by best guess record for domain of pm215@archaic.org.uk) client-ip=2001:8b0:1d0::1; Received: from pm215 by mnementh.archaic.org.uk with local (Exim 4.80) (envelope-from ) id 1V6Ink-0005fY-CG; Mon, 05 Aug 2013 12:18:12 +0100 From: Peter Maydell To: qemu-devel@nongnu.org Cc: patches@linaro.org, kvmarm@lists.cs.columbia.edu, "Mian M. Hamayun" Subject: [PATCH v4 2/2] ARM: Add 'virt' platform Date: Mon, 5 Aug 2013 12:18:12 +0100 Message-Id: <1375701492-21759-3-git-send-email-peter.maydell@linaro.org> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1375701492-21759-1-git-send-email-peter.maydell@linaro.org> References: <1375701492-21759-1-git-send-email-peter.maydell@linaro.org> X-Gm-Message-State: ALoCoQms5pqkbMpHkderyx7IMSCwzSHo7JDJHZTw5i3/oFclgGGFcG78HTygeArIZ5oXXaUNnDsL X-Removed-Original-Auth: Dkim didn't pass. X-Original-Sender: peter.maydell@linaro.org X-Original-Authentication-Results: mx.google.com; spf=neutral (google.com: 209.85.212.42 is neither permitted nor denied by best guess record for domain of patch+caf_=patchwork-forward=linaro.org@linaro.org) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org Precedence: list Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org List-ID: X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , From: John Rigby Add 'virt' platform support corresponding to arch/arm/mach-virt in the Linux kernel tree. This has no platform-specific code but can use any device whose kernel driver is is able to work purely from a device tree node. We use this to instantiate a minimal set of devices: a GIC and some virtio-mmio transports. TODO: * MAX_MEM for A15 could be higher if we shuffle things about * RAM or flash at addr 0?? Signed-off-by: John Rigby [PMM: Significantly overhauled: * renamed user-facing machine to just "virt" * removed the A9 support (it can't work since the A9 has no generic timers) * added virtio-mmio transports instead of random set of 'soc' devices * instead of updating io_base as we step through adding devices, define a memory map with an array (similar to vexpress) * folded in some minor fixes from John's aarch64-support patch * rather than explicitly doing endian-swapping on FDT cells, use fdt APIs that let us just pass in host-endian values and let the fdt layer take care of the swapping * miscellaneous minor code cleanups and style fixes ] Signed-off-by: Peter Maydell --- hw/arm/Makefile.objs | 2 +- hw/arm/virt.c | 363 ++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 364 insertions(+), 1 deletion(-) create mode 100644 hw/arm/virt.c diff --git a/hw/arm/Makefile.objs b/hw/arm/Makefile.objs index 9e3a06f..744484f 100644 --- a/hw/arm/Makefile.objs +++ b/hw/arm/Makefile.objs @@ -1,7 +1,7 @@ obj-y += boot.o collie.o exynos4_boards.o gumstix.o highbank.o obj-y += integratorcp.o kzm.o mainstone.o musicpal.o nseries.o obj-y += omap_sx1.o palm.o pic_cpu.o realview.o spitz.o stellaris.o -obj-y += tosa.o versatilepb.o vexpress.o xilinx_zynq.o z2.o +obj-y += tosa.o versatilepb.o vexpress.o virt.o xilinx_zynq.o z2.o obj-y += armv7m.o exynos4210.o pxa2xx.o pxa2xx_gpio.o pxa2xx_pic.o obj-y += omap1.o omap2.o strongarm.o diff --git a/hw/arm/virt.c b/hw/arm/virt.c new file mode 100644 index 0000000..2a743b7 --- /dev/null +++ b/hw/arm/virt.c @@ -0,0 +1,363 @@ +/* + * ARM mach-virt emulation + * + * Copyright (c) 2013 Linaro + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2 or later, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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 . + * + * Emulate a virtual board which works by passing Linux all the information + * it needs about what devices are present via the device tree. + * There are some restrictions about what we can do here: + * + we can only present devices whose Linux drivers will work based + * purely on the device tree with no platform data at all + * + we want to present a very stripped-down minimalist platform, + * both because this reduces the security attack surface from the guest + * and also because it reduces our exposure to being broken when + * the kernel updates its device tree bindings and requires further + * information in a device binding that we aren't providing. + * This is essentially the same approach kvmtool uses. + */ + +#include "hw/sysbus.h" +#include "hw/arm/arm.h" +#include "hw/arm/primecell.h" +#include "hw/devices.h" +#include "net/net.h" +#include "sysemu/device_tree.h" +#include "sysemu/sysemu.h" +#include "sysemu/kvm.h" +#include "hw/boards.h" +#include "exec/address-spaces.h" +#include "qemu/bitops.h" +#include "qemu/error-report.h" + +#define NUM_VIRTIO_TRANSPORTS 32 + +#define GIC_FDT_IRQ_TYPE_SPI 0 +#define GIC_FDT_IRQ_TYPE_PPI 1 + +#define GIC_FDT_IRQ_FLAGS_EDGE_LO_HI 1 +#define GIC_FDT_IRQ_FLAGS_EDGE_HI_LO 2 +#define GIC_FDT_IRQ_FLAGS_LEVEL_HI 4 +#define GIC_FDT_IRQ_FLAGS_LEVEL_LO 8 + +#define GIC_FDT_IRQ_PPI_CPU_START 8 +#define GIC_FDT_IRQ_PPI_CPU_WIDTH 8 + +enum { + VIRT_FLASH, + VIRT_MEM, + VIRT_CPUPERIPHS, + VIRT_GIC_DIST, + VIRT_GIC_CPU, + VIRT_MMIO, +}; + +typedef struct MemMapEntry { + hwaddr base; + hwaddr size; +} MemMapEntry; + +typedef struct VirtBoardInfo { + struct arm_boot_info bootinfo; + const char *cpu_model; + const char *cpu_compatible; + const char *qdevname; + const char *gic_compatible; + const MemMapEntry *memmap; + int smp_cpus; + void *fdt; + int fdt_size; +} VirtBoardInfo; + +/* Addresses and sizes of our components. + * We leave the first 64K free for possible use later for + * flash (for running boot code such as UEFI); following + * that is I/O, and then everything else is RAM (which may + * happily spill over into the high memory region beyond 4GB). + */ +static const MemMapEntry a15memmap[] = { + [VIRT_FLASH] = { 0, 0x100000 }, + [VIRT_CPUPERIPHS] = { 0x100000, 0x8000 }, + /* GIC distributor and CPU interfaces sit inside the CPU peripheral space */ + [VIRT_GIC_DIST] = { 0x101000, 0x1000 }, + [VIRT_GIC_CPU] = { 0x102000, 0x1000 }, + [VIRT_MMIO] = { 0x108000, 0x200 }, + /* ...repeating for a total of NUM_VIRTIO_TRANSPORTS, each of that size */ + [VIRT_MEM] = { 0x8000000, 30ULL * 1024 * 1024 * 1024 }, +}; + +static VirtBoardInfo machines[] = { + { + .cpu_model = "cortex-a15", + .cpu_compatible = "arm,cortex-a15", + .qdevname = "a15mpcore_priv", + .gic_compatible = "arm,cortex-a15-gic", + .memmap = a15memmap, + }, +}; + +static VirtBoardInfo *find_machine_info(const char *cpu) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(machines); i++) { + if (strcmp(cpu, machines[i].cpu_model) == 0) { + return &machines[i]; + } + } + return NULL; +} + +static void create_fdt(VirtBoardInfo *vbi) +{ + void *fdt = create_device_tree(&vbi->fdt_size); + + if (!fdt) { + error_report("create_device_tree() failed"); + exit(1); + } + + vbi->fdt = fdt; + + /* Header */ + qemu_devtree_setprop_string(fdt, "/", "compatible", "linux,dummy-virt"); + qemu_devtree_setprop_cell(fdt, "/", "#address-cells", 0x2); + qemu_devtree_setprop_cell(fdt, "/", "#size-cells", 0x2); + + /* + * /chosen and /memory nodes must exist for load_dtb + * to fill in necessary properties later + */ + qemu_devtree_add_subnode(fdt, "/chosen"); + qemu_devtree_add_subnode(fdt, "/memory"); + qemu_devtree_setprop_string(fdt, "/memory", "device_type", "memory"); + + /* No PSCI for TCG yet */ +#ifdef CONFIG_KVM + if (kvm_enabled()) { + qemu_devtree_add_subnode(fdt, "/psci"); + qemu_devtree_setprop_string(fdt, "/psci", "compatible", "arm,psci"); + qemu_devtree_setprop_string(fdt, "/psci", "method", "hvc"); + qemu_devtree_setprop_cell(fdt, "/psci", "cpu_suspend", + KVM_PSCI_FN_CPU_SUSPEND); + qemu_devtree_setprop_cell(fdt, "/psci", "cpu_off", KVM_PSCI_FN_CPU_OFF); + qemu_devtree_setprop_cell(fdt, "/psci", "cpu_on", KVM_PSCI_FN_CPU_ON); + qemu_devtree_setprop_cell(fdt, "/psci", "migrate", KVM_PSCI_FN_MIGRATE); + } +#endif +} + +static void fdt_add_timer_nodes(const VirtBoardInfo *vbi) +{ + /* Note that on A15 h/w these interrupts are level-triggered, + * but for the GIC implementation provided by both QEMU and KVM + * they are edge-triggered. + */ + uint32_t irqflags = GIC_FDT_IRQ_FLAGS_EDGE_LO_HI; + + irqflags = deposit32(irqflags, GIC_FDT_IRQ_PPI_CPU_START, + GIC_FDT_IRQ_PPI_CPU_WIDTH, (1 << vbi->smp_cpus) - 1); + + qemu_devtree_add_subnode(vbi->fdt, "/timer"); + qemu_devtree_setprop_string(vbi->fdt, "/timer", + "compatible", "arm,armv7-timer"); + qemu_devtree_setprop_cells(vbi->fdt, "/timer", "interrupts", + GIC_FDT_IRQ_TYPE_PPI, 13, irqflags, + GIC_FDT_IRQ_TYPE_PPI, 14, irqflags, + GIC_FDT_IRQ_TYPE_PPI, 11, irqflags, + GIC_FDT_IRQ_TYPE_PPI, 10, irqflags); +} + +static void fdt_add_cpu_nodes(const VirtBoardInfo *vbi) +{ + int cpu; + + qemu_devtree_add_subnode(vbi->fdt, "/cpus"); + qemu_devtree_setprop_cell(vbi->fdt, "/cpus", "#address-cells", 0x1); + qemu_devtree_setprop_cell(vbi->fdt, "/cpus", "#size-cells", 0x0); + + for (cpu = 0; cpu < vbi->smp_cpus; cpu++) { + char *nodename = g_strdup_printf("/cpus/cpu@%d", cpu); + + qemu_devtree_add_subnode(vbi->fdt, nodename); + qemu_devtree_setprop_string(vbi->fdt, nodename, "device_type", "cpu"); + qemu_devtree_setprop_string(vbi->fdt, nodename, "compatible", + vbi->cpu_compatible); + + if (vbi->smp_cpus > 1) { + qemu_devtree_setprop_string(vbi->fdt, nodename, + "enable-method", "psci"); + } + + qemu_devtree_setprop_cell(vbi->fdt, nodename, "reg", cpu); + g_free(nodename); + } +} + +static void fdt_add_gic_node(const VirtBoardInfo *vbi) +{ + uint32_t gic_phandle; + + gic_phandle = qemu_devtree_alloc_phandle(vbi->fdt); + qemu_devtree_setprop_cell(vbi->fdt, "/", "interrupt-parent", gic_phandle); + + qemu_devtree_add_subnode(vbi->fdt, "/intc"); + qemu_devtree_setprop_string(vbi->fdt, "/intc", "compatible", + vbi->gic_compatible); + qemu_devtree_setprop_cell(vbi->fdt, "/intc", "#interrupt-cells", 3); + qemu_devtree_setprop(vbi->fdt, "/intc", "interrupt-controller", NULL, 0); + qemu_devtree_setprop_sized_cells(vbi->fdt, "/intc", "reg", + 2, vbi->memmap[VIRT_GIC_DIST].base, + 2, vbi->memmap[VIRT_GIC_DIST].size, + 2, vbi->memmap[VIRT_GIC_CPU].base, + 2, vbi->memmap[VIRT_GIC_CPU].size); + qemu_devtree_setprop_cell(vbi->fdt, "/intc", "phandle", gic_phandle); +} + +static void create_virtio_devices(const VirtBoardInfo *vbi, qemu_irq *pic) +{ + int i; + hwaddr base = vbi->memmap[VIRT_MMIO].base; + hwaddr size = vbi->memmap[VIRT_MMIO].size; + + for (i = 0; i < NUM_VIRTIO_TRANSPORTS; i++) { + char *nodename; + int irq = i + 16; + + sysbus_create_simple("virtio-mmio", base, pic[irq]); + + nodename = g_strdup_printf("/virtio_mmio@%" PRIx64, base); + qemu_devtree_add_subnode(vbi->fdt, nodename); + qemu_devtree_setprop_string(vbi->fdt, nodename, + "compatible", "virtio,mmio"); + qemu_devtree_setprop_sized_cells(vbi->fdt, nodename, "reg", + 2, base, 2, size); + qemu_devtree_setprop_cells(vbi->fdt, nodename, "interrupts", + GIC_FDT_IRQ_TYPE_SPI, irq, + GIC_FDT_IRQ_FLAGS_EDGE_LO_HI); + g_free(nodename); + base += size; + } +} + +static void *machvirt_dtb(const struct arm_boot_info *binfo, int *fdt_size) +{ + const VirtBoardInfo *board = (const VirtBoardInfo *)binfo; + + *fdt_size = board->fdt_size; + return board->fdt; +} + +static void machvirt_init(QEMUMachineInitArgs *args) +{ + qemu_irq pic[64]; + MemoryRegion *sysmem = get_system_memory(); + int n; + MemoryRegion *ram = g_new(MemoryRegion, 1); + qemu_irq cpu_irq[4]; + DeviceState *dev; + SysBusDevice *busdev; + const char *cpu_model = args->cpu_model; + VirtBoardInfo *vbi; + + if (!cpu_model) { + cpu_model = "cortex-a15"; + } + + vbi = find_machine_info(cpu_model); + + if (!vbi) { + error_report("mach-virt: CPU %s not supported", cpu_model); + exit(1); + } + + vbi->smp_cpus = smp_cpus; + + /* + * Only supported method of starting secondary CPUs is PSCI and + * PSCI is not yet supported with TCG, so limit smp_cpus to 1 + * if we're not using KVM. + */ + if (!kvm_enabled() && smp_cpus > 1) { + error_report("mach-virt: must enable KVM to use multiple CPUs"); + exit(1); + } + + if (args->ram_size > vbi->memmap[VIRT_MEM].size) { + error_report("mach-virt: cannot model more than 30GB RAM"); + exit(1); + } + + create_fdt(vbi); + fdt_add_timer_nodes(vbi); + + for (n = 0; n < smp_cpus; n++) { + ARMCPU *cpu; + qemu_irq *irqp; + + cpu = cpu_arm_init(cpu_model); + irqp = arm_pic_init_cpu(cpu); + cpu_irq[n] = irqp[ARM_PIC_CPU_IRQ]; + } + fdt_add_cpu_nodes(vbi); + + memory_region_init_ram(ram, NULL, "mach-virt.ram", args->ram_size); + vmstate_register_ram_global(ram); + memory_region_add_subregion(sysmem, vbi->memmap[VIRT_MEM].base, ram); + + dev = qdev_create(NULL, vbi->qdevname); + qdev_prop_set_uint32(dev, "num-cpu", smp_cpus); + qdev_init_nofail(dev); + busdev = SYS_BUS_DEVICE(dev); + sysbus_mmio_map(busdev, 0, vbi->memmap[VIRT_CPUPERIPHS].base); + fdt_add_gic_node(vbi); + for (n = 0; n < smp_cpus; n++) { + sysbus_connect_irq(busdev, n, cpu_irq[n]); + } + + for (n = 0; n < 64; n++) { + pic[n] = qdev_get_gpio_in(dev, n); + } + + /* Create mmio transports, so the user can create virtio backends + * (which will be automatically plugged in to the transports). If + * no backend is created the transport will just sit harmlessly idle. + */ + create_virtio_devices(vbi, pic); + + vbi->bootinfo.ram_size = args->ram_size; + vbi->bootinfo.kernel_filename = args->kernel_filename; + vbi->bootinfo.kernel_cmdline = args->kernel_cmdline; + vbi->bootinfo.initrd_filename = args->initrd_filename; + vbi->bootinfo.nb_cpus = smp_cpus; + vbi->bootinfo.board_id = -1; + vbi->bootinfo.loader_start = vbi->memmap[VIRT_MEM].base; + vbi->bootinfo.get_dtb = machvirt_dtb; + arm_load_kernel(ARM_CPU(first_cpu), &vbi->bootinfo); +} + +static QEMUMachine machvirt_a15_machine = { + .name = "virt", + .desc = "ARM Virtual Machine", + .init = machvirt_init, + .max_cpus = 4, + DEFAULT_MACHINE_OPTIONS, +}; + +static void machvirt_machine_init(void) +{ + qemu_register_machine(&machvirt_a15_machine); +} + +machine_init(machvirt_machine_init);