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arm64: KVM: CPU specific system registers handling 

Add the support code for CPU specific system registers. Not much
here yet.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2013-02-06 17:30:48 +00:00
parent 7c8c5e6a91
commit b990a9d315
1 changed files with 85 additions and 0 deletions
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85
arch/arm64/kvm/sys_regs_generic_v8.c Normal file
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/*
* Copyright (C) 2012,2013 - ARM Ltd
* Author: Marc Zyngier <marc.zyngier@arm.com>
*
* Based on arch/arm/kvm/coproc_a15.c:
* Copyright (C) 2012 - Virtual Open Systems and Columbia University
* Authors: Rusty Russell <rusty@rustcorp.au>
* Christoffer Dall <c.dall@virtualopensystems.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. 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, see <http://www.gnu.org/licenses/>.
*/
#include <linux/kvm_host.h>
#include <asm/cputype.h>
#include <asm/kvm_arm.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_host.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_coproc.h>
#include <linux/init.h>
#include "sys_regs.h"
static bool access_actlr(struct kvm_vcpu *vcpu,
const struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
if (p->is_write)
return ignore_write(vcpu, p);
*vcpu_reg(vcpu, p->Rt) = vcpu_sys_reg(vcpu, ACTLR_EL1);
return true;
}
static void reset_actlr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
{
u64 actlr;
asm volatile("mrs %0, actlr_el1\n" : "=r" (actlr));
vcpu_sys_reg(vcpu, ACTLR_EL1) = actlr;
}
/*
* Implementation specific sys-reg registers.
* Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2
*/
static const struct sys_reg_desc genericv8_sys_regs[] = {
/* ACTLR_EL1 */
{ Op0(0b11), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b001),
access_actlr, reset_actlr, ACTLR_EL1 },
};
static struct kvm_sys_reg_target_table genericv8_target_table = {
.table64 = {
.table = genericv8_sys_regs,
.num = ARRAY_SIZE(genericv8_sys_regs),
},
};
static int __init sys_reg_genericv8_init(void)
{
unsigned int i;
for (i = 1; i < ARRAY_SIZE(genericv8_sys_regs); i++)
BUG_ON(cmp_sys_reg(&genericv8_sys_regs[i-1],
&genericv8_sys_regs[i]) >= 0);
kvm_register_target_sys_reg_table(KVM_ARM_TARGET_AEM_V8,
&genericv8_target_table);
kvm_register_target_sys_reg_table(KVM_ARM_TARGET_FOUNDATION_V8,
&genericv8_target_table);
kvm_register_target_sys_reg_table(KVM_ARM_TARGET_CORTEX_A57,
&genericv8_target_table);
return 0;
}
late_initcall(sys_reg_genericv8_init);