linux-kernel - [RFC 45/55] KVM: arm64: KVM: Inject stage-2 page faults

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Date:   Mon,  9 Jan 2017 01:24:41 -0500
From:   Jintack Lim <jintack@...columbia.edu>
To:     christoffer.dall@...aro.org, marc.zyngier@....com,
        pbonzini@...hat.com, rkrcmar@...hat.com, linux@...linux.org.uk,
        catalin.marinas@....com, will.deacon@....com,
        vladimir.murzin@....com, suzuki.poulose@....com,
        mark.rutland@....com, james.morse@....com,
        lorenzo.pieralisi@....com, kevin.brodsky@....com,
        wcohen@...hat.com, shankerd@...eaurora.org, geoff@...radead.org,
        andre.przywara@....com, eric.auger@...hat.com,
        anna-maria@...utronix.de, shihwei@...columbia.edu,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     jintack@...columbia.edu
Subject: [RFC 45/55] KVM: arm64: KVM: Inject stage-2 page faults

From: Christoffer Dall <christoffer.dall@...aro.org>

Inject stage-2 page faults to the guest hypervisor.

Signed-off-by: Christoffer Dall <christoffer.dall@...aro.org>
Signed-off-by: Jintack Lim <jintack@...columbia.edu>
---
 arch/arm64/include/asm/esr.h |  1 +
 arch/arm64/kvm/mmu-nested.c  | 30 ++++++++++++++++++++++++------
 2 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/include/asm/esr.h b/arch/arm64/include/asm/esr.h
index f32e3a7..6104e31 100644
--- a/arch/arm64/include/asm/esr.h
+++ b/arch/arm64/include/asm/esr.h
@@ -107,6 +107,7 @@
 #define ESR_ELx_CM 		(UL(1) << 8)
 
 /* ISS field definitions for exceptions taken in to Hyp */
+#define ESR_ELx_FSC_ADDRSZ	(0x00)
 #define ESR_ELx_CV		(UL(1) << 24)
 #define ESR_ELx_COND_SHIFT	(20)
 #define ESR_ELx_COND_MASK	(UL(0xF) << ESR_ELx_COND_SHIFT)
diff --git a/arch/arm64/kvm/mmu-nested.c b/arch/arm64/kvm/mmu-nested.c
index a2fab41..b161b55 100644
--- a/arch/arm64/kvm/mmu-nested.c
+++ b/arch/arm64/kvm/mmu-nested.c
@@ -55,22 +55,40 @@ static unsigned int pa_max(void)
 static int vcpu_inject_s2_trans_fault(struct kvm_vcpu *vcpu, gpa_t ipa,
 				      int level)
 {
-	/* TODO: Implement */
-	return -EFAULT;
+	u32 esr;
+
+	vcpu->arch.ctxt.el2_regs[FAR_EL2] = vcpu->arch.fault.far_el2;
+	vcpu->arch.ctxt.el2_regs[HPFAR_EL2] = vcpu->arch.fault.hpfar_el2;
+	esr = kvm_vcpu_get_hsr(vcpu) & ~ESR_ELx_FSC;
+	esr |= ESR_ELx_FSC_FAULT;
+	esr |= level & 0x3;
+	return kvm_inject_nested_sync(vcpu, esr);
 }
 
 static int vcpu_inject_s2_addr_sz_fault(struct kvm_vcpu *vcpu, gpa_t ipa,
 					int level)
 {
-	/* TODO: Implement */
-	return -EFAULT;
+	u32 esr;
+
+	vcpu->arch.ctxt.el2_regs[FAR_EL2] = vcpu->arch.fault.far_el2;
+	vcpu->arch.ctxt.el2_regs[HPFAR_EL2] = vcpu->arch.fault.hpfar_el2;
+	esr = kvm_vcpu_get_hsr(vcpu) & ~ESR_ELx_FSC;
+	esr |= ESR_ELx_FSC_ADDRSZ;
+	esr |= level & 0x3;
+	return kvm_inject_nested_sync(vcpu, esr);
 }
 
 static int vcpu_inject_s2_access_flag_fault(struct kvm_vcpu *vcpu, gpa_t ipa,
 					    int level)
 {
-	/* TODO: Implement */
-	return -EFAULT;
+	u32 esr;
+
+	vcpu->arch.ctxt.el2_regs[FAR_EL2] = vcpu->arch.fault.far_el2;
+	vcpu->arch.ctxt.el2_regs[HPFAR_EL2] = vcpu->arch.fault.hpfar_el2;
+	esr = kvm_vcpu_get_hsr(vcpu) & ~ESR_ELx_FSC;
+	esr |= ESR_ELx_FSC_ACCESS;
+	esr |= level & 0x3;
+	return kvm_inject_nested_sync(vcpu, esr);
 }
 
 static int check_base_s2_limits(struct kvm_vcpu *vcpu, struct s2_walk_info *wi,
-- 
1.9.1