[PATCH v6 5/7] arm64: kvm: route synchronous external abort exceptions to el2
From: Dongjiu Geng <hidden>
Date: 2017-08-28 10:19:28
Also in:
kvm, kvmarm, linux-acpi, lkml
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
ARMv8.2 adds a new bit HCR_EL2.TEA which controls to route synchronous external aborts to EL2, and adds a trap control bit HCR_EL2.TERR which controls to trap all Non-secure EL1&0 error record accesses to EL2. This patch enables the two bits for the guest OS. when an synchronous abort is generated in the guest OS, it will trap to EL3 firmware, EL3 firmware will check the HCR_EL2.TEA value to decide to jump to hypervisor or host OS. Enabling HCR_EL2.TERR makes error record access from guest trap to EL2. change since v5: 1. modify some patch description Signed-off-by: Dongjiu Geng <redacted> --- 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 61d694c2eae5..1188272003c4 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 fe39e6841326..47983db27de2 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; }
--
2.14.1