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x86/xen: remove 32-bit Xen PV guest support

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Xen is requiring 64-bit machines today and since Xen 4.14 it can be
built without 32-bit PV guest support. There is no need to carry the
burden of 32-bit PV guest support in the kernel any longer, as new
guests can be either HVM or PVH, or they can use a 64 bit kernel.

Remove the 32-bit Xen PV support from the kernel.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Juergen Gross
2020-06-29 10:35:39 +02:00
parent d7b461caa6
commit a13f2ef168
18 changed files with 50 additions and 840 deletions
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30
arch/x86/entry/vdso/vdso32/note.S
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@@ -16,33 +16,3 @@ ELFNOTE_START(Linux, 0, "a")
ELFNOTE_END
BUILD_SALT
#ifdef CONFIG_XEN
/*
* Add a special note telling glibc's dynamic linker a fake hardware
* flavor that it will use to choose the search path for libraries in the
* same way it uses real hardware capabilities like "mmx".
* We supply "nosegneg" as the fake capability, to indicate that we
* do not like negative offsets in instructions using segment overrides,
* since we implement those inefficiently. This makes it possible to
* install libraries optimized to avoid those access patterns in someplace
* like /lib/i686/tls/nosegneg. Note that an /etc/ld.so.conf.d/file
* corresponding to the bits here is needed to make ldconfig work right.
* It should contain:
* hwcap 1 nosegneg
* to match the mapping of bit to name that we give here.
*
* At runtime, the fake hardware feature will be considered to be present
* if its bit is set in the mask word. So, we start with the mask 0, and
* at boot time we set VDSO_NOTE_NONEGSEG_BIT if running under Xen.
*/
#include "../../xen/vdso.h" /* Defines VDSO_NOTE_NONEGSEG_BIT. */
ELFNOTE_START(GNU, 2, "a")
.long 1 /* ncaps */
VDSO32_NOTE_MASK: /* Symbol used by arch/x86/xen/setup.c */
.long 0 /* mask */
.byte VDSO_NOTE_NONEGSEG_BIT; .asciz "nosegneg" /* bit, name */
ELFNOTE_END
#endif