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#include <unistd.h>
#include <string.h>
#include <sys/utsname.h>
#include "android/utils/debug.h"
#define D(...) VERBOSE_PRINT(init,__VA_ARGS__)
/* A simple routine used to check that we can run the program under KVM.
* We simply want to ensure that the emulator binary and the kernel have the
* same endianess.
*
* A 32-bit executable cannot use the 64-bit KVM interface, even to run a 32-bit guest.
*/
#ifndef __linux__
#error "This file should only be compiled under linux"
#endif
int
kvm_check_allowed(void)
{
/* sizeof(void*) is enough to give us the program's bitness */
const int isProgram64bits = (sizeof(void*) == 8);
int isKernel64bits = 0;
struct utsname utn;
/* Is there a /dev/kvm device file here? */
if (access("/dev/kvm",F_OK)) {
/* no need to print a warning here */
D("No kvm device file detected");
return 0;
}
/* Can we access it? */
if (access("/dev/kvm",R_OK)) {
D("KVM device file is not readable for this user.");
return 0;
}
/* Determine kernel endianess */
memset(&utn,0,sizeof(utn));
uname(&utn);
D("Kernel machine type: %s", utn.machine);
if (strcmp(utn.machine,"x86_64") == 0)
isKernel64bits = 1;
else if (strcmp(utn.machine,"amd64") == 0)
isKernel64bits = 1;
if (isProgram64bits != isKernel64bits) {
if (isProgram64bits) {
D("kvm disabled (64-bit emulator and 32-bit kernel)");
} else {
D("kvm disabled (32-bit emulator and 64-bit kernel)");
}
return 0;
}
D("KVM mode auto-enabled!");
return 1;
}
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