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Load bzImage to guest RAM

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Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
This commit is contained in:
Pekka Enberg
2015-06-01 16:39:38 +01:00
committed by Will Deacon
parent 0d1f17ec4d
commit ee0e89c5f1
1 changed files with 26 additions and 5 deletions
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kvm.c
+26 -5
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@@ -141,30 +141,51 @@ static void kvm__run(struct kvm *self)
die_perror("KVM_RUN ioctl");
}
static inline void *guest_addr_to_host(struct kvm *self, unsigned long offset)
{
return self->ram_start + offset;
}
/* bzImages are loaded at 1 MB by default. */
#define KERNEL_START_ADDR (1024ULL * 1024ULL)
static const char *BZIMAGE_MAGIC = "HdrS";
static int load_bzimage(struct kvm *kvm, int fd)
static uint32_t load_bzimage(struct kvm *kvm, int fd)
{
struct boot_params boot;
void *p;
int nr;
read(fd, &boot, sizeof(boot));
if (memcmp(&boot.hdr.header, BZIMAGE_MAGIC, strlen(BZIMAGE_MAGIC)) != 0)
return -1;
return 0;
return 0;
lseek(fd, (boot.hdr.setup_sects+1) * 512, SEEK_SET);
p = guest_addr_to_host(kvm, KERNEL_START_ADDR);
while ((nr = read(fd, p, 65536)) > 0)
p += nr;
return boot.hdr.code32_start;
}
static void kvm__load_kernel(struct kvm *kvm, const char *kernel_filename)
static uint32_t kvm__load_kernel(struct kvm *kvm, const char *kernel_filename)
{
uint32_t ret;
int fd;
fd = open(kernel_filename, O_RDONLY);
if (fd < 0)
die("unable to open kernel");
if (load_bzimage(kvm, fd) < 0)
ret = load_bzimage(kvm, fd);
if (!ret)
die("%s is not a valid bzImage", kernel_filename);
return ret;
}
static const char *exit_reasons[] = {