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pvh: Boot uncompressed kernel using direct boot ABI

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These changes (along with corresponding Linux kernel and qboot changes)
enable a guest to be booted using the x86/HVM direct boot ABI.

This commit adds a load_elfboot() routine to pass the size and
location of the kernel entry point to qboot (which will fill in
the start_info struct information needed to to boot the guest).
Having loaded the ELF binary, load_linux() will run qboot
which continues the boot.

The address for the kernel entry point is read from an ELF Note
in the uncompressed kernel binary by a helper routine passed
to load_elf().

Co-developed-by: George Kennedy <George.Kennedy@oracle.com>
Signed-off-by: George Kennedy <George.Kennedy@oracle.com>
Signed-off-by: Liam Merwick <liam.merwick@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Liam Merwick 2019-01-15 12:18:06 +00:00 • committed by Paolo Bonzini
parent 20a965067f
commit ab969087da
2 changed files with 145 additions and 0 deletions
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10
include/elf.h
View file

@ -1640,6 +1640,16 @@ typedef struct elf64_shdr {
#define NT_ARM_HW_WATCH 0x403 /* ARM hardware watchpoint registers */
#define NT_ARM_SYSTEM_CALL 0x404 /* ARM system call number */
/*
* Physical entry point into the kernel.
*
* 32bit entry point into the kernel. When requested to launch the
* guest kernel, use this entry point to launch the guest in 32-bit
* protected mode with paging disabled.
*
* [ Corresponding definition in Linux kernel: include/xen/interface/elfnote.h ]
*/
#define XEN_ELFNOTE_PHYS32_ENTRY 18 /* 0x12 */
/* Note header in a PT_NOTE section */
typedef struct elf32_note {