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kvm: Add copying of kernel command line into guest memory

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We will need to modify heap pointer in guest.

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
This commit is contained in:
Cyrill Gorcunov
2015-06-01 16:39:39 +01:00
committed by Will Deacon
parent 305d905423
commit debcfac047
1 changed files with 20 additions and 0 deletions
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kvm.c
+20
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@@ -208,6 +208,7 @@ static bool load_bzimage(struct kvm *self, int fd, const char *kernel_cmdline)
struct boot_params boot;
unsigned long setup_sects;
unsigned int intr_addr;
size_t cmdline_size, cmdline_offset;
ssize_t setup_size;
void *p;
int nr;
@@ -243,6 +244,25 @@ static bool load_bzimage(struct kvm *self, int fd, const char *kernel_cmdline)
while ((nr = read(fd, p, 65536)) > 0)
p += nr;
if (boot.hdr.version < 0x0202 || !(boot.hdr.loadflags & 0x01))
cmdline_offset = (0x9ff0 - cmdline_size) & ~15;
else
cmdline_offset = 0x10000;
if (boot.hdr.version < 0x0206)
boot.hdr.cmdline_size = 256;
if (kernel_cmdline) {
cmdline_size = 0;
cmdline_size = strlen(kernel_cmdline) + 1;
if (cmdline_size > boot.hdr.cmdline_size)
cmdline_size = boot.hdr.cmdline_size;
p = guest_flat_to_host(self, cmdline_offset);
memset(p, 0, cmdline_size);
strcpy(p, kernel_cmdline);
}
self->boot_selector = BOOT_LOADER_SELECTOR;
/*
* The real-mode setup code starts at offset 0x200 of a bzImage. See