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ARM: KVM: don't special case PC when doing an MMIO

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Admitedly, reading a MMIO register to load PC is very weird.
Writing PC to a MMIO register is probably even worse. But
the architecture doesn't forbid any of these, and injecting
a Prefetch Abort is the wrong thing to do anyway.

Remove this check altogether, and let the adventurous guest
wander into LaLaLand if they feel compelled to do so.

Reported-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <cdall@cs.columbia.edu>
This commit is contained in:
Marc Zyngier 2013-05-14 12:11:38 +01:00 committed by Christoffer Dall
parent dac288f7b3
commit 8734f16fb2
2 changed files with 0 additions and 11 deletions
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5
arch/arm/include/asm/kvm_emulate.h
View File

@ -65,11 +65,6 @@ static inline bool vcpu_mode_priv(struct kvm_vcpu *vcpu)
return cpsr_mode > USR_MODE;;
}
static inline bool kvm_vcpu_reg_is_pc(struct kvm_vcpu *vcpu, int reg)
{
return reg == 15;
}
static inline u32 kvm_vcpu_get_hsr(struct kvm_vcpu *vcpu)
{
return vcpu->arch.fault.hsr;

6
arch/arm/kvm/mmio.c
View File

@ -86,12 +86,6 @@ static int decode_hsr(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
sign_extend = kvm_vcpu_dabt_issext(vcpu);
rt = kvm_vcpu_dabt_get_rd(vcpu);
if (kvm_vcpu_reg_is_pc(vcpu, rt)) {
/* IO memory trying to read/write pc */
kvm_inject_pabt(vcpu, kvm_vcpu_get_hfar(vcpu));
return 1;
}
mmio->is_write = is_write;
mmio->phys_addr = fault_ipa;
mmio->len = len;