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kvmtool: {x86} Add initrd support when loading elf kernel

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Signed-off-by: Fan Du <fan.du@intel.com>
Signed-off-by: Dimitri John Ledkov <dimitri.j.ledkov@intel.com>
This commit is contained in:
Fan Du
2015-09-02 11:53:52 -04:00
committed by Dimitri John Ledkov
parent 259e76b395
commit b1ef6ede7b
1 changed files with 25 additions and 0 deletions
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x86/kvm.c
+25
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@@ -356,6 +356,31 @@ static int load_elf64_binary(struct kvm *kvm, int fd_kernel, int fd_initrd,
zero_page->e820_map[4].type = E820_RAM;
}
if (fd_initrd >= 0) {
struct stat initrd_stat;
unsigned long addr;
void *p;
int nr;
if (fstat(fd_initrd, &initrd_stat))
die_perror("fstat");
/* boot.hdr.initrd_addr_max is 0x7fffffff */
addr = 0x7fffffff & ~0xfffff;
for (;;) {
if (addr < (kvm->ram_size - initrd_stat.st_size))
break;
addr -= 0x100000;
}
p = guest_flat_to_host(kvm, addr);
nr = read(fd_initrd, p, initrd_stat.st_size);
if (nr != initrd_stat.st_size)
die("Failed to read initrd");
zero_page->hdr.ramdisk_image = addr;
zero_page->hdr.ramdisk_size = initrd_stat.st_size;
}
/*
* normally, we would jump to real-mode code (either the bootloader or