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um: enable the use of optimized xor routines in UML

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This patch enables the use of optimized xor routines from the x86
tree as well as the necessary fpu api shims so they can work on
UML.

Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Anton Ivanov 2021-03-12 15:16:08 +00:00 committed by Richard Weinberger
parent d8fb32f479
commit c0ecca6604
2 changed files with 36 additions and 1 deletions
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20
arch/um/include/asm/fpu/api.h Normal file
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@ -0,0 +1,20 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _ASM_UM_FPU_API_H
#define _ASM_UM_FPU_API_H
/* Copyright (c) 2020 Cambridge Greys Ltd
* Copyright (c) 2020 Red Hat Inc.
* A set of "dummy" defines to allow the direct inclusion
* of x86 optimized copy, xor, etc routines into the
* UML code tree. */
#define kernel_fpu_begin() (void)0
#define kernel_fpu_end() (void)0
static inline bool irq_fpu_usable(void)
{
return true;
}
#endif

17
arch/um/include/asm/xor.h
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@ -1,7 +1,22 @@
/* SPDX-License-Identifier: GPL-2.0 */
#include <asm-generic/xor.h>
#ifndef _ASM_UM_XOR_H
#define _ASM_UM_XOR_H
#ifdef CONFIG_64BIT
#undef CONFIG_X86_32
#else
#define CONFIG_X86_32 1
#endif
#include <asm/cpufeature.h>
#include <../../x86/include/asm/xor.h>
#include <linux/time-internal.h>
#ifdef CONFIG_UML_TIME_TRAVEL_SUPPORT
#undef XOR_SELECT_TEMPLATE
/* pick an arbitrary one - measuring isn't possible with inf-cpu */
#define XOR_SELECT_TEMPLATE(x) \
(time_travel_mode == TT_MODE_INFCPU ? &xor_block_8regs : NULL)
#endif
#endif