From: anton.ivanov@cambridgegreys.com
To: linux-um@lists.infradead.org
Cc: richard@nod.at, Anton Ivanov <anton.ivanov@cambridgegreys.com>
Subject: [PATCH v5 2/4] um: enable the use of optimized xor routines in UML
Date: Mon, 14 Dec 2020 18:14:57 +0000 [thread overview]
Message-ID: <20201214181459.11096-3-anton.ivanov@cambridgegreys.com> (raw)
In-Reply-To: <20201214181459.11096-1-anton.ivanov@cambridgegreys.com>
From: Anton Ivanov <anton.ivanov@cambridgegreys.com>
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>
---
arch/um/include/asm/fpu/api.h | 14 ++++++++++++++
arch/um/include/asm/xor.h | 17 ++++++++++++++++-
2 files changed, 30 insertions(+), 1 deletion(-)
create mode 100644 arch/um/include/asm/fpu/api.h
diff --git a/arch/um/include/asm/fpu/api.h b/arch/um/include/asm/fpu/api.h
new file mode 100644
index 000000000000..2873a6f0105d
--- /dev/null
+++ b/arch/um/include/asm/fpu/api.h
@@ -0,0 +1,14 @@
+/* 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
+
+#endif
diff --git a/arch/um/include/asm/xor.h b/arch/um/include/asm/xor.h
index 36b33d62a35d..f512704a9ec7 100644
--- a/arch/um/include/asm/xor.h
+++ b/arch/um/include/asm/xor.h
@@ -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
--
2.20.1
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next prev parent reply other threads:[~2020-12-14 18:15 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-14 18:14 Updated performance patch series anton.ivanov
2020-12-14 18:14 ` [PATCH v5 1/4] um: Add support for host CPU flags and alignment anton.ivanov
2020-12-14 18:14 ` anton.ivanov [this message]
2020-12-14 18:14 ` [PATCH v5 3/4] um: add a UML specific futex implementation anton.ivanov
2020-12-15 9:43 ` Anton Ivanov
2020-12-15 9:46 ` Richard Weinberger
2020-12-15 9:56 ` Anton Ivanov
2020-12-14 18:14 ` [PATCH v5 4/4] um: allow the use of glibc functions instead of builtins anton.ivanov
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