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spa: add cpu method to get the VM type

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Make a method to query the VM we are running on.
This commit is contained in:
Wim Taymans 2021-04-16 16:39:35 +02:00
parent 07c9dbbffa
commit ce828af9e1
2 changed files with 95 additions and 1 deletions
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72
spa/plugins/support/cpu.c
View file

@ -28,6 +28,7 @@
#include <errno.h>
#include <stdio.h>
#include <sched.h>
#include <fcntl.h>
#ifdef __FreeBSD__
#include <sys/sysctl.h>
@ -52,8 +53,25 @@ struct impl {
uint32_t force;
uint32_t count;
uint32_t max_align;
uint32_t vm_type;
};
static char *read_file(const char *name, char *buffer, size_t len)
{
int n, fd;
if ((fd = open(name, O_RDONLY | O_CLOEXEC, 0)) < 0)
return NULL;
if ((n = read(fd, buffer, len)) < 0) {
close(fd);
return NULL;
}
buffer[n] = 0;
close(fd);
return buffer;
}
# if defined (__i386__) || defined (__x86_64__)
#include "cpu-x86.c"
#define init(t) x86_init(t)
@ -116,12 +134,66 @@ impl_cpu_get_max_align(void *object)
return impl->max_align;
}
static uint32_t
impl_cpu_get_vm_type(void *object)
{
struct impl *impl = object;
if (impl->vm_type != 0)
return impl->vm_type;
#if defined(__i386__) || defined(__x86_64__) || defined(__arm__) || defined(__aarch64__)
static const char *const dmi_vendors[] = {
"/sys/class/dmi/id/product_name", /* Test this before sys_vendor to detect KVM over QEMU */
"/sys/class/dmi/id/sys_vendor",
"/sys/class/dmi/id/board_vendor",
"/sys/class/dmi/id/bios_vendor"
};
static const struct {
const char *vendor;
int id;
} dmi_vendor_table[] = {
{ "KVM", SPA_CPU_VM_KVM },
{ "QEMU", SPA_CPU_VM_QEMU },
{ "VMware", SPA_CPU_VM_VMWARE }, /* https://kb.vmware.com/s/article/1009458 */
{ "VMW", SPA_CPU_VM_VMWARE },
{ "innotek GmbH", SPA_CPU_VM_ORACLE },
{ "Oracle Corporation", SPA_CPU_VM_ORACLE },
{ "Xen", SPA_CPU_VM_XEN },
{ "Bochs", SPA_CPU_VM_BOCHS },
{ "Parallels", SPA_CPU_VM_PARALLELS },
/* https://wiki.freebsd.org/bhyve */
{ "BHYVE", SPA_CPU_VM_BHYVE },
};
uint32_t i, j;
for (i = 0; i < SPA_N_ELEMENTS(dmi_vendors); i++) {
char buffer[256], *s;
if ((s = read_file(dmi_vendors[i], buffer, sizeof(buffer))) == NULL)
continue;
for (j = 0; j < SPA_N_ELEMENTS(dmi_vendor_table); j++) {
if (strstr(s, dmi_vendor_table[j].vendor) == s) {
spa_log_debug(impl->log, "Virtualization %s found in DMI (%s)",
s, dmi_vendors[i]);
impl->vm_type = dmi_vendor_table[j].id;
goto done;
}
}
}
done:
#endif
return impl->vm_type;
}
static const struct spa_cpu_methods impl_cpu = {
SPA_VERSION_CPU_METHODS,
.get_flags = impl_cpu_get_flags,
.force_flags = impl_cpu_force_flags,
.get_count = impl_cpu_get_count,
.get_max_align = impl_cpu_get_max_align,
.get_vm_type = impl_cpu_get_vm_type,
};
static int impl_get_interface(struct spa_handle *handle, const char *type, void **interface)