[RFC PATCH] kexec, x86/boot: map systab region in identity mapping before accessing it
bhe at redhat.com
Mon Apr 22 07:33:46 PDT 2019
On 04/19/19 at 01:36pm, Borislav Petkov wrote:
> On Fri, Apr 19, 2019 at 01:28:01PM +0200, Borislav Petkov wrote:
> > Read again what I said: "should all be passed through boot_params".
> > Which means, boot_params should be extended with a field of a flag to
> > say: "this is a kexec'ed kernel".
> And by that I mean similar to the XLF_EFI_KEXEC mechanism. The first
> kernel or kexec(1) should prepare the info needed by the kexec'ed
We have set the loader type to '0x0D << 4' for kexec specifically, in both
kexec_load and kexec_file_load. We can check this to identify if it's
kexec-ed kernel or not.
Update patch with it?
static void *bzImage64_load(struct kimage *image, char *kernel,
unsigned long kernel_len, char *initrd,
unsigned long initrd_len, char *cmdline,
unsigned long cmdline_len)
/* bootloader info. Do we need a separate ID for kexec kernel loader? */
params->hdr.type_of_loader = 0x0D << 4;
More information about the kexec