correct the commit message: In the firmware-first RAS solution, 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 host OS kernel
On 2017/6/26 20:45, Dongjiu Geng wrote: > 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 <[email protected]> > --- > 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 f5ea0ba..5f64ab2 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; > } >
