Re: [Qemu-devel] [PATCH v5 3/5] optionrom: add new PVH option rom

[Paolo Bonzini <pbonzini@redhat.com>]

On 18/01/19 13:01, Stefano Garzarella wrote:
> The new pvh.bin option rom can be used with SeaBIOS to boot
> uncompressed kernel using the x86/HVM direct boot ABI.
> 
> pvh.S contains the entry point of the option rom. It runs
> in real mode, loads the e820 table querying the BIOS, and
> then it switches to 32bit protected mode and jumps to the
> pvh_load_kernel() written in pvh_main.c.
> pvh_load_kernel() loads the cmdline and kernel entry_point
> using fw_cfg, then it looks for RSDP, fills the
> hvm_start_info required by x86/HVM ABI, and finally jumps
> to the kernel entry_point.
> 
> Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
> Reviewed-by: Liam Merwick <liam.merwick@oracle.com>

... and, for mingw:

diff --git a/pc-bios/optionrom/pvh_main.c b/pc-bios/optionrom/pvh_main.c
index d1b8b4b..a015e1b 100644
--- a/pc-bios/optionrom/pvh_main.c
+++ b/pc-bios/optionrom/pvh_main.c
@@ -43,7 +43,7 @@ struct pvh_e820_table {
     struct hvm_memmap_table_entry table[E820_MAXENTRIES];
 };

-struct pvh_e820_table pvh_e820 __attribute__ ((aligned));
+struct pvh_e820_table pvh_e820 asm("pvh_e820") __attribute__ ((aligned));

 static struct hvm_start_info start_info;
 static struct hvm_modlist_entry ramdisk_mod;


Paolo