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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>

Jan Beulich committed 4 years ago

Commit 335e4dd1 parent ce2f46f2 files · +11 −4Browse files

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include/xen/interface/xen.h+3−0
@@ -722,6 +722,9 @@ struct dom0_vga_console_info { · 721 unmodified lines
722722 uint32_t gbl_caps;
723723 /* Mode attributes (offset 0x0, VESA command 0x4f01). */
724724 uint16_t mode_attrs;
725+ uint16_t pad;
726+ /* high 32 bits of lfb_base */
727+ uint32_t ext_lfb_base;
725728 } vesa_lfb;
726729 } u;
727730 };