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Message-Id: <1453239965-1466-2-git-send-email-syeh@vmware.com>
Date: Tue, 19 Jan 2016 13:46:00 -0800
From: "Sinclair Yeh" <syeh@...are.com>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
Sinclair Yeh <syeh@...are.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>,
Alok Kataria <akataria@...are.com>,
virtualization@...ts.linux-foundation.org,
Xavier Deguillard <xdeguillard@...are.com>
Subject: [PATCH 1/6] x86: Add VMWare Host Communication Macros
These macros will be used by multiple VMWare modules for handling
host communication.
Signed-off-by: Sinclair Yeh <syeh@...are.com>
Reviewed-by: Thomas Hellstrom <thellstrom@...are.com>
Reviewed-by: Alok N Kataria <akataria@...are.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Alok Kataria <akataria@...are.com>
Cc: linux-kernel@...r.kernel.org
Cc: virtualization@...ts.linux-foundation.org
Cc: Xavier Deguillard <xdeguillard@...are.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
v2:
* Keeping only the minimal common platform defines
* added vmware_platform() check function
v3:
* Added new field to handle different hypervisor magic values
v4:
* Make it so that "cmd" is always the first parameter for both
High-Bandwidh and non-High-Bandwidth version of the macro
* Addressed comments from H. Peter Anvin on the assembly code
v5:
* Separate SI/DI as independent input/output arguments, given
the latest update to vmw_balloon.c
---
arch/x86/include/asm/vmware.h | 138 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 138 insertions(+)
create mode 100644 arch/x86/include/asm/vmware.h
diff --git a/arch/x86/include/asm/vmware.h b/arch/x86/include/asm/vmware.h
new file mode 100644
index 0000000..7d02a2b
--- /dev/null
+++ b/arch/x86/include/asm/vmware.h
@@ -0,0 +1,138 @@
+/*
+ * Copyright (C) 2015, VMware, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT. See the GNU General Public License for more
+ * details.
+ *
+ * Based on code from vmware.c and vmmouse.c.
+ * Author:
+ * Sinclair Yeh <syeh@...are.com>
+ */
+#ifndef _ASM_X86_VMWARE_H
+#define _ASM_X86_VMWARE_H
+
+
+/**
+ * Hypervisor-specific bi-directional communication channel. Should never
+ * execute on bare metal hardware. The caller must make sure to check for
+ * supported hypervisor before using these macros.
+ *
+ * The last two parameters are both input and output and must be initialized.
+ *
+ * @cmd: [IN] Message Cmd
+ * @in_ebx: [IN] Message Len, through EBX
+ * @in_si: [IN] Input argument through SI, set to 0 if not used
+ * @in_di: [IN] Input argument through DI, set ot 0 if not used
+ * @port_num: [IN] port number + [channel id]
+ * @magic: [IN] hypervisor magic value
+ * @eax: [OUT] value of EAX register
+ * @ebx: [OUT] e.g. status from an HB message status command
+ * @ecx: [OUT] e.g. status from a non-HB message status command
+ * @edx: [OUT] e.g. channel id
+ * @si: [OUT]
+ * @di: [OUT]
+ */
+#define VMW_PORT(cmd, in_ebx, in_si, in_di, \
+ port_num, magic, \
+ eax, ebx, ecx, edx, si, di) \
+({ \
+ asm volatile ("inl %%dx, %%eax;" : \
+ "=a"(eax), \
+ "=b"(ebx), \
+ "=c"(ecx), \
+ "=d"(edx), \
+ "=S"(si), \
+ "=D"(di) : \
+ "a"(magic), \
+ "b"(in_ebx), \
+ "c"(cmd), \
+ "d"(port_num), \
+ "S"(in_si), \
+ "D"(in_di) : \
+ "memory"); \
+})
+
+
+/**
+ * Hypervisor-specific bi-directional communication channel. Should never
+ * execute on bare metal hardware. The caller must make sure to check for
+ * supported hypervisor before using these macros.
+ *
+ * The last 3 parameters are both input and output and must be initialized.
+ *
+ * @cmd: [IN] Message Cmd
+ * @in_ecx: [IN] Message Len, through ECX
+ * @in_si: [IN] Input argument through SI, set to 0 if not used
+ * @in_di: [IN] Input argument through DI, set to 0 if not used
+ * @port_num: [IN] port number + [channel id]
+ * @magic: [IN] hypervisor magic value
+ * @eax: [OUT] value of EAX register
+ * @ebx: [OUT] e.g. status from an HB message status command
+ * @ecx: [OUT] e.g. status from a non-HB message status command
+ * @edx: [OUT] e.g. channel id
+ * @si: [OUT]
+ * @di: [OUT]
+ * @bp: [INOUT] set to 0 if not used
+ */
+#define VMW_PORT_HB_OUT(cmd, in_ecx, in_si, in_di, \
+ port_num, magic, \
+ eax, ebx, ecx, edx, si, di, bp) \
+({ \
+ asm volatile ("push %%rbp;" \
+ "xchgq %6, %%rbp;" \
+ "rep outsb;" \
+ "xchgq %%rbp, %6;" \
+ "pop %%rbp;" : \
+ "=a"(eax), \
+ "=b"(ebx), \
+ "=c"(ecx), \
+ "=d"(edx), \
+ "=S"(si), \
+ "=D"(di), \
+ "+r"(bp) : \
+ "a"(magic), \
+ "b"(cmd), \
+ "c"(in_ecx), \
+ "d"(port_num), \
+ "S"(in_si), \
+ "D"(in_di) : \
+ "memory", "cc"); \
+})
+
+
+#define VMW_PORT_HB_IN(cmd, in_ecx, in_si, in_di, \
+ port_num, magic, \
+ eax, ebx, ecx, edx, si, di, bp) \
+({ \
+ asm volatile ("push %%rbp;" \
+ "xchgq %6, %%rbp;" \
+ "rep insb;" \
+ "xchgq %%rbp, %6;" \
+ "pop %%rbp" : \
+ "=a"(eax), \
+ "=b"(ebx), \
+ "=c"(ecx), \
+ "=d"(edx), \
+ "=S"(si), \
+ "=D"(di), \
+ "+r"(bp) : \
+ "a"(magic), \
+ "b"(cmd), \
+ "c"(in_ecx), \
+ "d"(port_num), \
+ "S"(in_si), \
+ "D"(in_di) : \
+ "memory", "cc"); \
+})
+
+
+#endif
+
--
1.9.1
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