video/vesa: drop "vesa-remap" command line option

If we get mode dimensions wrong, having the remapping size controllable
via command line option isn't going to help much. Drop the option.

While adjusting this also
- add __initdata to the variable,
- use ROUNDUP() instead of open-coding it.

Requested-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>

CHANGELOG.md

@@ -7,7 +7,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ## [unstable UNRELEASED](https://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=staging) - TBD
 
 ### Removed / support downgraded
- - dropped support for the (x86-only) "vesa-mtrr" command line option
+ - dropped support for the (x86-only) "vesa-mtrr" and "vesa-remap" command line options
 
 ## [4.16.0](https://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=staging) - 2021-12-02
 

docs/misc/xen-command-line.pandoc

@@ -2489,9 +2489,6 @@ PCPUs when using the credit1 scheduler. This prevents rapid fluttering
 of a VCPU between CPUs, and reduces the implicit overheads such as
 cache-warming. 1ms (1000) has been measured as a good value.
 
-### vesa-map
-> `= <integer>`
-
 ### vesa-ram
 > `= <integer>`
 

xen/drivers/video/vesa.c

@@ -26,8 +26,7 @@ static bool_t vga_compat;
 static unsigned int vram_total;
 integer_param("vesa-ram", vram_total);
 
-static unsigned int vram_remap;
-integer_param("vesa-map", vram_remap);
+static unsigned int __initdata vram_remap;
 
 static int font_height;
 static int __init parse_font_height(const char *s)
@@ -79,12 +78,8 @@ void __init vesa_early_init(void)
      *                 use for vesafb.  With modern cards it is no
      *                 option to simply use vram_total as that
      *                 wastes plenty of kernel address space. */
-    vram_remap = (vram_remap ?
-                  (vram_remap << 20) :
-                  ((vram_vmode + (1 << L2_PAGETABLE_SHIFT) - 1) &
-                   ~((1 << L2_PAGETABLE_SHIFT) - 1)));
-    vram_remap = max_t(unsigned int, vram_remap, vram_vmode);
-    vram_remap = min_t(unsigned int, vram_remap, vram_total);
+    vram_remap = ROUNDUP(vram_vmode, 1 << L2_PAGETABLE_SHIFT);
+    vram_remap = min(vram_remap, vram_total);
 }
 
 void __init vesa_init(void)