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Commit 8730046c authored by K. Y. Srinivasan's avatar K. Y. Srinivasan Committed by Greg Kroah-Hartman
Browse files

Drivers: hv vmbus: Move Hypercall page setup out of common code 



As part of the effort to separate out architecture specific code, move the
hypercall page setup to an architecture specific file.

Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 352c9624

MAINTAINERS

+1 −0
Original line number Diff line number Diff line
@@ -5962,6 +5962,7 @@ S: Maintained 
F:	arch/x86/include/asm/mshyperv.h

F:	arch/x86/include/uapi/asm/hyperv.h

F:	arch/x86/kernel/cpu/mshyperv.c

F:	arch/x86/hyperv

F:	drivers/hid/hid-hyperv.c

F:	drivers/hv/

F:	drivers/input/serio/hyperv-keyboard.c

arch/x86/Kbuild

+3 −0
Original line number Diff line number Diff line
@@ -7,6 +7,9 @@ obj-$(CONFIG_KVM) += kvm/ 
# Xen paravirtualization support

obj-$(CONFIG_XEN) += xen/



# Hyper-V paravirtualization support

obj-$(CONFIG_HYPERVISOR_GUEST) += hyperv/



# lguest paravirtualization support

obj-$(CONFIG_LGUEST_GUEST) += lguest/

arch/x86/hyperv/Makefile

0 → 100644
+1 −0
Original line number Diff line number Diff line 
obj-y		:= hv_init.o

arch/x86/hyperv/hv_init.c

0 → 100644
+62 −0
Original line number Diff line number Diff line 
/*

 * X86 specific Hyper-V initialization code.

 *

 * Copyright (C) 2016, Microsoft, Inc.

 *

 * Author : K. Y. Srinivasan <kys@microsoft.com>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 as published

 * by the Free Software Foundation.

 *

 * 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.

 *

 */



#include <linux/types.h>

#include <asm/hypervisor.h>

#include <asm/hyperv.h>

#include <asm/mshyperv.h>

#include <linux/version.h>

#include <linux/vmalloc.h>

#include <linux/mm.h>



void *hv_hypercall_pg;

/*

 * This function is to be invoked early in the boot sequence after the

 * hypervisor has been detected.

 *

 * 1. Setup the hypercall page.

 */

void hyperv_init(void)

{

	u64 guest_id;

	union hv_x64_msr_hypercall_contents hypercall_msr;



	if (x86_hyper != &x86_hyper_ms_hyperv)

		return;



	/*

	 * Setup the hypercall page and enable hypercalls.

	 * 1. Register the guest ID

	 * 2. Enable the hypercall and register the hypercall page

	 */

	guest_id = generate_guest_id(0, LINUX_VERSION_CODE, 0);

	wrmsrl(HV_X64_MSR_GUEST_OS_ID, guest_id);



	hv_hypercall_pg  = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_EXEC);

	if (hv_hypercall_pg == NULL) {

		wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);

		return;

	}



	rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);

	hypercall_msr.enable = 1;

	hypercall_msr.guest_physical_address = vmalloc_to_pfn(hv_hypercall_pg);

	wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);

}

EXPORT_SYMBOL_GPL(hv_hypercall_pg);

arch/x86/include/asm/mshyperv.h

+5 −0
Original line number Diff line number Diff line
@@ -80,4 +80,9 @@ void hv_setup_kexec_handler(void (*handler)(void)); 
void hv_remove_kexec_handler(void);

void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs));

void hv_remove_crash_handler(void);



#if IS_ENABLED(CONFIG_HYPERV)

void hyperv_init(void);

extern void *hv_hypercall_pg;

#endif

#endif