Commit 335e4dd6 authored by Jan Beulich's avatar Jan Beulich Committed by Juergen Gross
Browse files

xen/x86: obtain upper 32 bits of video frame buffer address for Dom0 



The hypervisor has been supplying this information for a couple of major
releases. Make use of it. The need to set a flag in the capabilities
field also points out that the prior setting of that field from the
hypervisor interface's gbl_caps one was wrong, so that code gets deleted
(there's also no equivalent of this in native boot code).

Signed-off-by: default avatarJan Beulich <jbeulich@suse.com>
Reviewed-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>

Link: https://lore.kernel.org/r/a3df8bf3-d044-b7bb-3383-cd5239d6d4af@suse.com


Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
parent ce2f46f3

arch/x86/xen/vga.c

+8 −4
Original line number Diff line number Diff line
@@ -62,14 +62,18 @@ void __init xen_init_vga(const struct dom0_vga_console_info *info, size_t size) 
			break;

		}



		if (size >= offsetof(struct dom0_vga_console_info,

				     u.vesa_lfb.gbl_caps)

		    + sizeof(info->u.vesa_lfb.gbl_caps))

			screen_info->capabilities = info->u.vesa_lfb.gbl_caps;

		if (size >= offsetof(struct dom0_vga_console_info,

				     u.vesa_lfb.mode_attrs)

		    + sizeof(info->u.vesa_lfb.mode_attrs))

			screen_info->vesa_attributes = info->u.vesa_lfb.mode_attrs;



		if (size >= offsetof(struct dom0_vga_console_info,

				     u.vesa_lfb.ext_lfb_base)

		    + sizeof(info->u.vesa_lfb.ext_lfb_base)

		    && info->u.vesa_lfb.ext_lfb_base) {

			screen_info->ext_lfb_base = info->u.vesa_lfb.ext_lfb_base;

			screen_info->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;

		}

		break;

	}

}

include/xen/interface/xen.h

+3 −0
Original line number Diff line number Diff line
@@ -722,6 +722,9 @@ struct dom0_vga_console_info { 
			uint32_t gbl_caps;

			/* Mode attributes (offset 0x0, VESA command 0x4f01). */

			uint16_t mode_attrs;

			uint16_t pad;

			/* high 32 bits of lfb_base */

			uint32_t ext_lfb_base;

		} vesa_lfb;

	} u;

};