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Such (bogus address) ends up mapped in vesa_init(), and since it overlaps with a RAM region the whole system goes down pretty badly, see: (XEN) vesafb: framebuffer at 0x0000000000000000, mapped to 0xffff82c0002010= 00, using 35209k, total 35209k (XEN) vesafb: mode is 0x37557x32, linelength=3D960, font 8x16 (XEN) vesafb: Truecolor: size=3D8:8:8:8, shift=3D24:0:8:16 (XEN) (XEN) (XEN) (XEN) (XEN) (XEN) (XEN) (XEN) =EF=BF=BDERROR: Class:0; Su= bclass:0; Operation: 0 ERROR: No ConOut ERROR: No ConIn Do like Linux and prevent using the EFI Frame Buffer if the base address is 0. This is inline with the logic in Linuxes fb_base_is_valid() function at drivers/video/fbdev/efifb.c v6.0.9. See also Linux commit 133bb070e94ab41d750c6f2160c8843e46f11b78 for further reference. Signed-off-by: Roger Pau Monn=C3=A9 --- Other options would be doing the check in vesa_init(), but that would also then apply to other framebuffers and won't be strictly limited to the EFI fb. We could also check in vesa_init() whether the framebuffer overlaps with any RAM region, but I think that should be in addition to the change done here. --- xen/arch/x86/efi/efi-boot.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/xen/arch/x86/efi/efi-boot.h b/xen/arch/x86/efi/efi-boot.h index e82ac9daa7..a68091d82a 100644 --- a/xen/arch/x86/efi/efi-boot.h +++ b/xen/arch/x86/efi/efi-boot.h @@ -552,7 +552,7 @@ static void __init efi_arch_video_init(EFI_GRAPHICS_OUT= PUT_PROTOCOL *gop, bpp =3D 0; break; } - if ( bpp > 0 ) + if ( bpp > 0 && gop->Mode->FrameBufferBase ) { vga_console_info.video_type =3D XEN_VGATYPE_EFI_LFB; vga_console_info.u.vesa_lfb.gbl_caps =3D 2; /* possibly non-VGA */ --=20 2.37.3