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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: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

Link: https://lore.kernel.org/r/a3df8bf3-d044-b7bb-3383-cd5239d6d4af@suse.com
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Jan Beulich 2022-01-04 09:46:06 +01:00 committed by Juergen Gross
parent ce2f46f353
commit 335e4dd67b
2 changed files with 11 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
arch/x86/xen/vga.c
View File

@ -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;
}
}

3
include/xen/interface/xen.h
View File

@ -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;
};