pvh: use x86/HVM direct boot ABI

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

QEMU parses the uncompressed kernel binary passed to it via -kernel
to read the ELF Note which contains the address to be loaded.  QEMU
then depends on qboot to populate the start_info struct needed by
the direct boot ABI and configure the guest e820 tables before
jumping to the loaded kernel entry.

Signed-off-by: George Kennedy <George.Kennedy@oracle.com>
Signed-off-by: Liam Merwick <Liam.Merwick@oracle.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/tables.c b/tables.c
index 32b2406..9493691 100644
--- a/tables.c
+++ b/tables.c
@@ -2,6 +2,9 @@
 #include "stdio.h"
 #include "fw_cfg.h"
 #include "string.h"
+#include "start_info.h"
+
+extern struct hvm_start_info start_info;
 
 struct loader_cmd {
 	uint32_t cmd;
@@ -67,6 +70,13 @@ static void do_alloc(char *file, uint32_t align, uint8_t zone)
 
 	set_file_addr(id, p);
 	fw_cfg_read_file(id, p, n);
+
+	/* For PVH boot, save the PA where the RSDP is stored */
+	if (zone == ALLOC_FSEG) {
+		if (!memcmp(p, "RSD PTR ", 8)) {
+			start_info.rsdp_paddr = (uintptr_t)id_to_addr(id);
+		}
+	}
 }
 
 static void do_ptr(char *dest, char *src, uint32_t offset, uint8_t size)