linux-kernel - [PATCH v2] arm64: kvm: route synchronous external abort exceptions to el2

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Message-ID: <1498306822-2924-1-git-send-email-gengdongjiu@huawei.com>
Date:   Sat, 24 Jun 2017 20:20:22 +0800
From:   Dongjiu Geng <gengdongjiu@...wei.com>
To:     <marc.zyngier@....com>, <james.morse@....com>,
        <christoffer.dall@...aro.org>, <kvmarm@...ts.cs.columbia.edu>,
        <wuquanming@...wei.com>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <gengdongjiu@...wei.com>
Subject: [PATCH v2] arm64: kvm: route synchronous external abort exceptions to el2

In the firmware-first RAS solution, guest OS receives an synchronous
external abort, then trapped to EL3 by SCR_EL3.EA. Firmware inspects
the HCR_EL2.TEA and chooses the target to send APEI's SEA notification.
If the SCR_EL3.EA is set, delegates the error exception to the hypervisor,
otherwise it delegates to the guest OS kernel

Signed-off-by: Dongjiu Geng <gengdongjiu@...wei.com>
---
 arch/arm64/include/asm/kvm_arm.h     | 2 ++
 arch/arm64/include/asm/kvm_emulate.h | 7 +++++++
 2 files changed, 9 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index 61d694c..1188272 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -23,6 +23,8 @@
 #include <asm/types.h>
 
 /* Hyp Configuration Register (HCR) bits */
+#define HCR_TEA		(UL(1) << 37)
+#define HCR_TERR	(UL(1) << 36)
 #define HCR_E2H		(UL(1) << 34)
 #define HCR_ID		(UL(1) << 33)
 #define HCR_CD		(UL(1) << 32)
diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index a3259a9..93dc3d1 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -47,6 +47,13 @@ static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu)
 	vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS;
 	if (is_kernel_in_hyp_mode())
 		vcpu->arch.hcr_el2 |= HCR_E2H;
+	if (cpus_have_const_cap(ARM64_HAS_RAS_EXTN)) {
+		/* route synchronous external abort exceptions to EL2 */
+		vcpu->arch.hcr_el2 |= HCR_TEA;
+		/* trap error record accesses */
+		vcpu->arch.hcr_el2 |= HCR_TERR;
+	}
+
 	if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features))
 		vcpu->arch.hcr_el2 &= ~HCR_RW;
 }
-- 
2.10.1