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6cca9100db
commit b6ae256afd32f96bec0117175b329d0dd617655e upstream.
On AArch64 you can do a sign-extended load to either a 32-bit or 64-bit
register, and we should only sign extend the register up to the width of
the register as specified in the operation (by using the 32-bit Wn or
64-bit Xn register specifier).
As it turns out, the architecture provides this decoding information in
the SF ("Sixty-Four" -- how cute...) bit.
Let's take advantage of this with the usual 32-bit/64-bit header file
dance and do the right thing on AArch64 hosts.
Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20191212195055.5541-1-christoffer.dall@arm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
29 lines
761 B
C
29 lines
761 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 - Virtual Open Systems and Columbia University
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* Author: Christoffer Dall <c.dall@virtualopensystems.com>
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*/
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#ifndef __ARM_KVM_MMIO_H__
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#define __ARM_KVM_MMIO_H__
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#include <linux/kvm_host.h>
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#include <asm/kvm_asm.h>
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#include <asm/kvm_arm.h>
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struct kvm_decode {
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unsigned long rt;
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bool sign_extend;
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/* Not used on 32-bit arm */
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bool sixty_four;
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};
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void kvm_mmio_write_buf(void *buf, unsigned int len, unsigned long data);
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unsigned long kvm_mmio_read_buf(const void *buf, unsigned int len);
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int kvm_handle_mmio_return(struct kvm_vcpu *vcpu, struct kvm_run *run);
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int io_mem_abort(struct kvm_vcpu *vcpu, struct kvm_run *run,
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phys_addr_t fault_ipa);
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#endif /* __ARM_KVM_MMIO_H__ */
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