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>
This commit is contained in:
Liu Yu-B13201 2012-03-15 10:52:13 +00:00 committed by Alexander Graf
parent b48b2c3e50
commit 2e1ae9c07d
7 changed files with 92 additions and 35 deletions

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@ -153,6 +153,8 @@
#define EV_HCALL_CLOBBERS2 EV_HCALL_CLOBBERS3, "r5"
#define EV_HCALL_CLOBBERS1 EV_HCALL_CLOBBERS2, "r4"
extern bool epapr_paravirt_enabled;
extern u32 epapr_hypercall_start[];
/*
* We use "uintptr_t" to define a register because it's guaranteed to be a

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@ -128,6 +128,7 @@ ifneq ($(CONFIG_XMON)$(CONFIG_KEXEC),)
obj-y += ppc_save_regs.o
endif
obj-$(CONFIG_EPAPR_PARAVIRT) += epapr_paravirt.o epapr_hcalls.o
obj-$(CONFIG_KVM_GUEST) += kvm.o kvm_emul.o
# Disable GCOV in odd or sensitive code

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@ -0,0 +1,25 @@
/*
* Copyright (C) 2012 Freescale Semiconductor, 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.
*/
#include <linux/threads.h>
#include <asm/reg.h>
#include <asm/page.h>
#include <asm/cputable.h>
#include <asm/thread_info.h>
#include <asm/ppc_asm.h>
#include <asm/asm-offsets.h>
/* Hypercall entry point. Will be patched with device tree instructions. */
.global epapr_hypercall_start
epapr_hypercall_start:
li r3, -1
nop
nop
nop
blr

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@ -0,0 +1,52 @@
/*
* 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);

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@ -31,6 +31,7 @@
#include <asm/cacheflush.h>
#include <asm/disassemble.h>
#include <asm/ppc-opcode.h>
#include <asm/epapr_hcalls.h>
#define KVM_MAGIC_PAGE (-4096L)
#define magic_var(x) KVM_MAGIC_PAGE + offsetof(struct kvm_vcpu_arch_shared, x)
@ -726,7 +727,7 @@ unsigned long kvm_hypercall(unsigned long *in,
unsigned long register r11 asm("r11") = nr;
unsigned long register r12 asm("r12");
asm volatile("bl kvm_hypercall_start"
asm volatile("bl epapr_hypercall_start"
: "=r"(r0), "=r"(r3), "=r"(r4), "=r"(r5), "=r"(r6),
"=r"(r7), "=r"(r8), "=r"(r9), "=r"(r10), "=r"(r11),
"=r"(r12)
@ -747,29 +748,6 @@ unsigned long kvm_hypercall(unsigned long *in,
}
EXPORT_SYMBOL_GPL(kvm_hypercall);
static int kvm_para_setup(void)
{
extern u32 kvm_hypercall_start;
struct device_node *hyper_node;
u32 *insts;
int len, i;
hyper_node = of_find_node_by_path("/hypervisor");
if (!hyper_node)
return -1;
insts = (u32*)of_get_property(hyper_node, "hcall-instructions", &len);
if (len % 4)
return -1;
if (len > (4 * 4))
return -1;
for (i = 0; i < (len / 4); i++)
kvm_patch_ins(&(&kvm_hypercall_start)[i], insts[i]);
return 0;
}
static __init void kvm_free_tmp(void)
{
unsigned long start, end;
@ -791,7 +769,7 @@ static int __init kvm_guest_init(void)
if (!kvm_para_available())
goto free_tmp;
if (kvm_para_setup())
if (!epapr_paravirt_enabled)
goto free_tmp;
if (kvm_para_has_feature(KVM_FEATURE_MAGIC_PAGE))

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@ -24,16 +24,6 @@
#include <asm/page.h>
#include <asm/asm-offsets.h>
/* Hypercall entry point. Will be patched with device tree instructions. */
.global kvm_hypercall_start
kvm_hypercall_start:
li r3, -1
nop
nop
nop
blr
#define KVM_MAGIC_PAGE (-4096)
#ifdef CONFIG_64BIT

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@ -25,6 +25,7 @@ source "arch/powerpc/platforms/wsp/Kconfig"
config KVM_GUEST
bool "KVM Guest support"
default n
select EPAPR_PARAVIRT
---help---
This option enables various optimizations for running under the KVM
hypervisor. Overhead for the kernel when not running inside KVM should
@ -32,6 +33,14 @@ config KVM_GUEST
In case of doubt, say Y
config EPAPR_PARAVIRT
bool "ePAPR para-virtualization support"
default n
help
Enables ePAPR para-virtualization support for guests.
In case of doubt, say Y
config PPC_NATIVE
bool
depends on 6xx || PPC64