[PATCH 4/5] x86/loader: expose unpatched kernel

[Gerd Hoffmann <kraxel@redhat.com>]

Add a new "etc/boot/kernel" fw_cfg file, containing the kernel without
the setup header patches.  Intended use is booting in UEFI with secure
boot enabled, where the setup header patching breaks secure boot
verification.

Needs OVMF changes too to be actually useful.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/i386/x86.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/i386/x86.c b/hw/i386/x86.c
index 6f75948b3021..6724e408e576 100644
--- a/hw/i386/x86.c
+++ b/hw/i386/x86.c
@@ -1125,6 +1125,9 @@ void x86_load_linux(X86MachineState *x86ms,
     sev_load_ctx.setup_data = (char *)setup;
     sev_load_ctx.setup_size = setup_size;
 
+    /* kernel without setup header patches */
+    fw_cfg_add_file(fw_cfg, "etc/boot/kernel", kernel, kernel_size);
+
     if (sev_enabled()) {
         sev_add_kernel_loader_hashes(&sev_load_ctx, &error_fatal);
     }
-- 
2.44.0