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This commit is contained in:
Sascha Nesterovic
2025-08-11 14:29:00 +02:00
parent c66122e619
commit 4d134a1294
2688 changed files with 1127995 additions and 11475 deletions
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10
samples/Kconfig
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@@ -278,6 +278,16 @@ config SAMPLE_CORESIGHT_SYSCFG
This demonstrates how a user may create their own CoreSight
configurations and easily load them into the system at runtime.
config SAMPLE_GUNYAH
bool "Build example Gunyah Virtual Machine Manager"
depends on CC_CAN_LINK && HEADERS_INSTALL
depends on GUNYAH
help
Build an example Gunyah VMM userspace program capable of launching
a basic virtual machine under the Gunyah hypervisor.
This demonstrates how to create a virtual machine under the Gunyah
hypervisor.
config SAMPLE_KMEMLEAK
tristate "Simple test for the kernel memory leak detector"
depends on DEBUG_KMEMLEAK && m

1
samples/Makefile
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@@ -38,3 +38,4 @@ obj-$(CONFIG_SAMPLE_KMEMLEAK) += kmemleak/
obj-$(CONFIG_SAMPLE_CORESIGHT_SYSCFG) += coresight/
obj-$(CONFIG_SAMPLE_FPROBE) += fprobe/
obj-$(CONFIG_SAMPLES_RUST) += rust/
obj-$(CONFIG_SAMPLE_GUNYAH) += gunyah/

6
samples/gunyah/Makefile Normal file
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@@ -0,0 +1,6 @@
# SPDX-License-Identifier: GPL-2.0-only
userprogs-always-y += gunyah_vmm
dtb-y += sample_vm.dtb
userccflags += -I usr/include

266
samples/gunyah/gunyah_vmm.c Normal file
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@@ -0,0 +1,266 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
*/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <getopt.h>
#include <limits.h>
#include <stdint.h>
#include <fcntl.h>
#include <string.h>
#include <sys/sysmacros.h>
#define __USE_GNU
#include <sys/mman.h>
#include <linux/gunyah.h>
#define DEFAULT_GUEST_BASE 0x80000000
#define DEFAULT_GUEST_SIZE 0x6400000 /* 100 MiB */
#define DEFAULT_DTB_OFFSET 0x45f0000 /* 70MiB - 64 KiB */
#define DEFAULT_RAMDISK_OFFSET 0x4600000 /* 70MiB */
struct vm_config {
int image_fd;
int dtb_fd;
int ramdisk_fd;
uint64_t guest_base;
uint64_t guest_size;
off_t image_size;
uint64_t dtb_offset;
off_t dtb_size;
uint64_t ramdisk_offset;
off_t ramdisk_size;
};
static struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "image", required_argument, NULL, 'i' },
{ "dtb", required_argument, NULL, 'd' },
{ "ramdisk", optional_argument, NULL, 'r' },
{ "base", optional_argument, NULL, 'B' },
{ "size", optional_argument, NULL, 'S' },
{ "dtb_offset", optional_argument, NULL, 'D' },
{ "ramdisk_offset", optional_argument, NULL, 'R' },
{ }
};
static void print_help(char *cmd)
{
printf("gunyah_vmm, a sample tool to launch Gunyah VMs\n"
"Usage: %s <options>\n"
" --help, -h this menu\n"
" --image, -i <image> VM image file to load (e.g. a kernel Image) [Required]\n"
" --dtb, -d <dtb> Devicetree file to load [Required]\n"
" --ramdisk, -r <ramdisk> Ramdisk file to load\n"
" --base, -B <address> Set the base address of guest's memory [Default: 0x%08x]\n"
" --size, -S <number> The number of bytes large to make the guest's memory [Default: 0x%08x]\n"
" --dtb_offset, -D <number> Offset into guest memory to load the DTB [Default: 0x%08x]\n"
" --ramdisk_offset, -R <number> Offset into guest memory to load a ramdisk [Default: 0x%08x]\n"
, cmd, DEFAULT_GUEST_BASE, DEFAULT_GUEST_SIZE,
DEFAULT_DTB_OFFSET, DEFAULT_RAMDISK_OFFSET);
}
int main(int argc, char **argv)
{
int gunyah_fd, vm_fd, guest_fd;
struct gh_userspace_memory_region guest_mem_desc = { 0 };
struct gh_vm_dtb_config dtb_config = { 0 };
char *guest_mem;
struct vm_config config = {
/* Defaults good enough to boot static kernel and a basic ramdisk */
.image_fd = -1,
.dtb_fd = -1,
.ramdisk_fd = -1,
.guest_base = DEFAULT_GUEST_BASE,
.guest_size = DEFAULT_GUEST_SIZE,
.dtb_offset = DEFAULT_DTB_OFFSET,
.ramdisk_offset = DEFAULT_RAMDISK_OFFSET,
};
struct stat st;
int opt, optidx, ret = 0;
long l;
while ((opt = getopt_long(argc, argv, "hi:d:r:B:S:D:R:c:", options, &optidx)) != -1) {
switch (opt) {
case 'i':
config.image_fd = open(optarg, O_RDONLY | O_CLOEXEC);
if (config.image_fd < 0) {
perror("Failed to open image");
return -1;
}
if (stat(optarg, &st) < 0) {
perror("Failed to stat image");
return -1;
}
config.image_size = st.st_size;
break;
case 'd':
config.dtb_fd = open(optarg, O_RDONLY | O_CLOEXEC);
if (config.dtb_fd < 0) {
perror("Failed to open dtb");
return -1;
}
if (stat(optarg, &st) < 0) {
perror("Failed to stat dtb");
return -1;
}
config.dtb_size = st.st_size;
break;
case 'r':
config.ramdisk_fd = open(optarg, O_RDONLY | O_CLOEXEC);
if (config.ramdisk_fd < 0) {
perror("Failed to open ramdisk");
return -1;
}
if (stat(optarg, &st) < 0) {
perror("Failed to stat ramdisk");
return -1;
}
config.ramdisk_size = st.st_size;
break;
case 'B':
l = strtol(optarg, NULL, 0);
if (l == LONG_MIN) {
perror("Failed to parse base address");
return -1;
}
config.guest_base = l;
break;
case 'S':
l = strtol(optarg, NULL, 0);
if (l == LONG_MIN) {
perror("Failed to parse memory size");
return -1;
}
config.guest_size = l;
break;
case 'D':
l = strtol(optarg, NULL, 0);
if (l == LONG_MIN) {
perror("Failed to parse dtb offset");
return -1;
}
config.dtb_offset = l;
break;
case 'R':
l = strtol(optarg, NULL, 0);
if (l == LONG_MIN) {
perror("Failed to parse ramdisk offset");
return -1;
}
config.ramdisk_offset = l;
break;
case 'h':
print_help(argv[0]);
return 0;
default:
print_help(argv[0]);
return -1;
}
}
if (config.image_fd == -1 || config.dtb_fd == -1) {
print_help(argv[0]);
return -1;
}
if (config.image_size > config.guest_size) {
fprintf(stderr, "Image size puts it outside guest memory. Make image smaller or increase guest memory size.\n");
return -1;
}
if (config.dtb_offset + config.dtb_size > config.guest_size) {
fprintf(stderr, "DTB offset and size puts it outside guest memory. Make dtb smaller or increase guest memory size.\n");
return -1;
}
if (config.ramdisk_fd == -1 &&
config.ramdisk_offset + config.ramdisk_size > config.guest_size) {
fprintf(stderr, "Ramdisk offset and size puts it outside guest memory. Make ramdisk smaller or increase guest memory size.\n");
return -1;
}
gunyah_fd = open("/dev/gunyah", O_RDWR | O_CLOEXEC);
if (gunyah_fd < 0) {
perror("Failed to open /dev/gunyah");
return -1;
}
vm_fd = ioctl(gunyah_fd, GH_CREATE_VM, 0);
if (vm_fd < 0) {
perror("Failed to create vm");
return -1;
}
guest_fd = memfd_create("guest_memory", MFD_CLOEXEC);
if (guest_fd < 0) {
perror("Failed to create guest memfd");
return -1;
}
if (ftruncate(guest_fd, config.guest_size) < 0) {
perror("Failed to grow guest memory");
return -1;
}
guest_mem = mmap(NULL, config.guest_size, PROT_READ | PROT_WRITE, MAP_SHARED, guest_fd, 0);
if (guest_mem == MAP_FAILED) {
perror("Not enough memory");
return -1;
}
if (read(config.image_fd, guest_mem, config.image_size) < 0) {
perror("Failed to read image into guest memory");
return -1;
}
if (read(config.dtb_fd, guest_mem + config.dtb_offset, config.dtb_size) < 0) {
perror("Failed to read dtb into guest memory");
return -1;
}
if (config.ramdisk_fd > 0 &&
read(config.ramdisk_fd, guest_mem + config.ramdisk_offset,
config.ramdisk_size) < 0) {
perror("Failed to read ramdisk into guest memory");
return -1;
}
guest_mem_desc.label = 0;
guest_mem_desc.flags = GH_MEM_ALLOW_READ | GH_MEM_ALLOW_WRITE | GH_MEM_ALLOW_EXEC;
guest_mem_desc.guest_phys_addr = config.guest_base;
guest_mem_desc.memory_size = config.guest_size;
guest_mem_desc.userspace_addr = (__u64)guest_mem;
if (ioctl(vm_fd, GH_VM_SET_USER_MEM_REGION, &guest_mem_desc) < 0) {
perror("Failed to register guest memory with VM");
return -1;
}
dtb_config.guest_phys_addr = config.guest_base + config.dtb_offset;
dtb_config.size = config.dtb_size;
if (ioctl(vm_fd, GH_VM_SET_DTB_CONFIG, &dtb_config) < 0) {
perror("Failed to set DTB configuration for VM");
return -1;
}
ret = ioctl(vm_fd, GH_VM_START);
if (ret) {
perror("GH_VM_START failed");
return -1;
}
while (1)
pause();
return 0;
}

68
samples/gunyah/sample_vm.dts Normal file
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@@ -0,0 +1,68 @@
// SPDX-License-Identifier: BSD-3-Clause
/*
* Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
*/
/dts-v1/;
/ {
#address-cells = <2>;
#size-cells = <2>;
interrupt-parent = <&intc>;
chosen {
bootargs = "nokaslr";
};
cpus {
#address-cells = <0x2>;
#size-cells = <0>;
cpu@0 {
device_type = "cpu";
compatible = "arm,armv8";
reg = <0 0>;
};
};
intc: interrupt-controller@3FFF0000 {
compatible = "arm,gic-v3";
#interrupt-cells = <3>;
#address-cells = <2>;
#size-cells = <2>;
interrupt-controller;
reg = <0 0x3FFF0000 0 0x10000>,
<0 0x3FFD0000 0 0x20000>;
};
timer {
compatible = "arm,armv8-timer";
always-on;
interrupts = <1 13 0x108>,
<1 14 0x108>,
<1 11 0x108>,
<1 10 0x108>;
clock-frequency = <19200000>;
};
gunyah-vm-config {
image-name = "linux_vm_0";
memory {
#address-cells = <2>;
#size-cells = <2>;
base-address = <0 0x80000000>;
};
interrupts {
config = <&intc>;
};
vcpus {
affinity-map = < 0 >;
sched-priority = < (-1) >;
sched-timeslice = < 2000 >;
};
};
};