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arm64: KVM: MMIO access backend 

Define the necessary structures to perform an MMIO access.

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 2012-12-10 16:29:50 +00:00
parent 4f8d6632ec
commit d7246bf357
1 changed files with 59 additions and 0 deletions
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59
arch/arm64/include/asm/kvm_mmio.h Normal file
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/*
* Copyright (C) 2012 - Virtual Open Systems and Columbia University
* Author: 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/>.
*/
#ifndef __ARM64_KVM_MMIO_H__
#define __ARM64_KVM_MMIO_H__
#include <linux/kvm_host.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_arm.h>
/*
* This is annoying. The mmio code requires this, even if we don't
* need any decoding. To be fixed.
*/
struct kvm_decode {
unsigned long rt;
bool sign_extend;
};
/*
* The in-kernel MMIO emulation code wants to use a copy of run->mmio,
* which is an anonymous type. Use our own type instead.
*/
struct kvm_exit_mmio {
phys_addr_t phys_addr;
u8 data[8];
u32 len;
bool is_write;
};
static inline void kvm_prepare_mmio(struct kvm_run *run,
struct kvm_exit_mmio *mmio)
{
run->mmio.phys_addr = mmio->phys_addr;
run->mmio.len = mmio->len;
run->mmio.is_write = mmio->is_write;
memcpy(run->mmio.data, mmio->data, mmio->len);
run->exit_reason = KVM_EXIT_MMIO;
}
int kvm_handle_mmio_return(struct kvm_vcpu *vcpu, struct kvm_run *run);
int io_mem_abort(struct kvm_vcpu *vcpu, struct kvm_run *run,
phys_addr_t fault_ipa);
#endif /* __ARM64_KVM_MMIO_H__ */