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Commit e82e0305 authored by Marc Zyngier's avatar Marc Zyngier
Browse files

arm64: KVM: 32bit guest fault injection 



Add fault injection capability for 32bit guests.

Reviewed-by: default avatarChristopher Covington <cov@codeaurora.org>
Reviewed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent b4afad06

arch/arm64/kvm/inject_fault.c

+78 −1
Original line number Diff line number Diff line 
/*

 * Fault injection for 64bit guests.

 * Fault injection for both 32 and 64bit guests.

 *

 * Copyright (C) 2012,2013 - ARM Ltd

 * Author: Marc Zyngier <marc.zyngier@arm.com>
@@ -29,6 +29,74 @@ 
				 PSR_I_BIT | PSR_D_BIT)

#define EL1_EXCEPT_SYNC_OFFSET	0x200



static void prepare_fault32(struct kvm_vcpu *vcpu, u32 mode, u32 vect_offset)

{

	unsigned long cpsr;

	unsigned long new_spsr_value = *vcpu_cpsr(vcpu);

	bool is_thumb = (new_spsr_value & COMPAT_PSR_T_BIT);

	u32 return_offset = (is_thumb) ? 4 : 0;

	u32 sctlr = vcpu_cp15(vcpu, c1_SCTLR);



	cpsr = mode | COMPAT_PSR_I_BIT;



	if (sctlr & (1 << 30))

		cpsr |= COMPAT_PSR_T_BIT;

	if (sctlr & (1 << 25))

		cpsr |= COMPAT_PSR_E_BIT;



	*vcpu_cpsr(vcpu) = cpsr;



	/* Note: These now point to the banked copies */

	*vcpu_spsr(vcpu) = new_spsr_value;

	*vcpu_reg(vcpu, 14) = *vcpu_pc(vcpu) + return_offset;



	/* Branch to exception vector */

	if (sctlr & (1 << 13))

		vect_offset += 0xffff0000;

	else /* always have security exceptions */

		vect_offset += vcpu_cp15(vcpu, c12_VBAR);



	*vcpu_pc(vcpu) = vect_offset;

}



static void inject_undef32(struct kvm_vcpu *vcpu)

{

	prepare_fault32(vcpu, COMPAT_PSR_MODE_UND, 4);

}



/*

 * Modelled after TakeDataAbortException() and TakePrefetchAbortException

 * pseudocode.

 */

static void inject_abt32(struct kvm_vcpu *vcpu, bool is_pabt,

			 unsigned long addr)

{

	u32 vect_offset;

	u32 *far, *fsr;

	bool is_lpae;



	if (is_pabt) {

		vect_offset = 12;

		far = &vcpu_cp15(vcpu, c6_IFAR);

		fsr = &vcpu_cp15(vcpu, c5_IFSR);

	} else { /* !iabt */

		vect_offset = 16;

		far = &vcpu_cp15(vcpu, c6_DFAR);

		fsr = &vcpu_cp15(vcpu, c5_DFSR);

	}



	prepare_fault32(vcpu, COMPAT_PSR_MODE_ABT | COMPAT_PSR_A_BIT, vect_offset);



	*far = addr;



	/* Give the guest an IMPLEMENTATION DEFINED exception */

	is_lpae = (vcpu_cp15(vcpu, c2_TTBCR) >> 31);

	if (is_lpae)

		*fsr = 1 << 9 | 0x34;

	else

		*fsr = 0x14;

}



static void inject_abt64(struct kvm_vcpu *vcpu, bool is_iabt, unsigned long addr)

{

	unsigned long cpsr = *vcpu_cpsr(vcpu);
@@ -98,6 +166,9 @@ static void inject_undef64(struct kvm_vcpu *vcpu) 
 */

void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr)

{

	if (!(vcpu->arch.hcr_el2 & HCR_RW))

		inject_abt32(vcpu, false, addr);



	inject_abt64(vcpu, false, addr);

}
@@ -111,6 +182,9 @@ void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr) 
 */

void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr)

{

	if (!(vcpu->arch.hcr_el2 & HCR_RW))

		inject_abt32(vcpu, true, addr);



	inject_abt64(vcpu, true, addr);

}
@@ -122,5 +196,8 @@ void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr) 
 */

void kvm_inject_undefined(struct kvm_vcpu *vcpu)

{

	if (!(vcpu->arch.hcr_el2 & HCR_RW))

		inject_undef32(vcpu);



	inject_undef64(vcpu);

}