linux-stable/arch/powerpc/kernel/epapr_paravirt.c
Liu Yu-B13201 2e1ae9c07d KVM: PPC: Factor out guest epapr initialization
epapr paravirtualization support is now a Kconfig
selectable option

Signed-off-by: Liu Yu <yu.liu@freescale.com>
[stuart.yoder@freescale.com: misc minor fixes, description update]
Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
2012-05-30 11:43:10 +02:00

52 lines
1.4 KiB
C

/*
* ePAPR para-virtualization support.
*
* 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. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright (C) 2012 Freescale Semiconductor, Inc.
*/
#include <linux/of.h>
#include <asm/epapr_hcalls.h>
#include <asm/cacheflush.h>
#include <asm/code-patching.h>
bool epapr_paravirt_enabled;
static int __init epapr_paravirt_init(void)
{
struct device_node *hyper_node;
const u32 *insts;
int len, i;
hyper_node = of_find_node_by_path("/hypervisor");
if (!hyper_node)
return -ENODEV;
insts = of_get_property(hyper_node, "hcall-instructions", &len);
if (!insts)
return -ENODEV;
if (len % 4 || len > (4 * 4))
return -ENODEV;
for (i = 0; i < (len / 4); i++)
patch_instruction(epapr_hypercall_start + i, insts[i]);
epapr_paravirt_enabled = true;
return 0;
}
early_initcall(epapr_paravirt_init);