From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760790AbdAIGgu (ORCPT ); Mon, 9 Jan 2017 01:36:50 -0500 Received: from outprodmail01.cc.columbia.edu ([128.59.72.39]:38176 "EHLO outprodmail01.cc.columbia.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S939605AbdAIGZ7 (ORCPT ); Mon, 9 Jan 2017 01:25:59 -0500 From: Jintack Lim To: christoffer.dall@linaro.org, marc.zyngier@arm.com, pbonzini@redhat.com, rkrcmar@redhat.com, linux@armlinux.org.uk, catalin.marinas@arm.com, will.deacon@arm.com, vladimir.murzin@arm.com, suzuki.poulose@arm.com, mark.rutland@arm.com, james.morse@arm.com, lorenzo.pieralisi@arm.com, kevin.brodsky@arm.com, wcohen@redhat.com, shankerd@codeaurora.org, geoff@infradead.org, andre.przywara@arm.com, eric.auger@redhat.com, anna-maria@linutronix.de, shihwei@cs.columbia.edu, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: jintack@cs.columbia.edu Subject: [RFC 13/55] KVM: arm64: Handle eret instruction traps Date: Mon, 9 Jan 2017 01:24:09 -0500 Message-Id: <1483943091-1364-14-git-send-email-jintack@cs.columbia.edu> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1483943091-1364-1-git-send-email-jintack@cs.columbia.edu> References: <1483943091-1364-1-git-send-email-jintack@cs.columbia.edu> X-No-Spam-Score: Local Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When HCR.NV bit is set, eret instruction execution in the guest hypervisor will trap with EC code 0x1A. Let ELR_EL2 and SPSR_EL2 state from the guest's perspective be restored to the hardware on the next guest entry. Signed-off-by: Jintack Lim --- arch/arm64/include/asm/esr.h | 1 + arch/arm64/kvm/handle_exit.c | 12 ++++++++++++ arch/arm64/kvm/trace.h | 21 +++++++++++++++++++++ 3 files changed, 34 insertions(+) diff --git a/arch/arm64/include/asm/esr.h b/arch/arm64/include/asm/esr.h index d14c478..f32e3a7 100644 --- a/arch/arm64/include/asm/esr.h +++ b/arch/arm64/include/asm/esr.h @@ -42,6 +42,7 @@ #define ESR_ELx_EC_HVC64 (0x16) #define ESR_ELx_EC_SMC64 (0x17) #define ESR_ELx_EC_SYS64 (0x18) +#define ESR_ELx_EC_ERET (0x1A) /* Unallocated EC: 0x19 - 0x1E */ #define ESR_ELx_EC_IMP_DEF (0x1f) #define ESR_ELx_EC_IABT_LOW (0x20) diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c index a204adf..4e4a915 100644 --- a/arch/arm64/kvm/handle_exit.c +++ b/arch/arm64/kvm/handle_exit.c @@ -125,6 +125,17 @@ static int kvm_handle_guest_debug(struct kvm_vcpu *vcpu, struct kvm_run *run) return ret; } +static int kvm_handle_eret(struct kvm_vcpu *vcpu, struct kvm_run *run) +{ + trace_kvm_nested_eret(vcpu, vcpu_el2_reg(vcpu, ELR_EL2), + vcpu_el2_reg(vcpu, SPSR_EL2)); + + *vcpu_pc(vcpu) = vcpu_el2_reg(vcpu, ELR_EL2); + *vcpu_cpsr(vcpu) = vcpu_el2_reg(vcpu, SPSR_EL2); + + return 1; +} + static exit_handle_fn arm_exit_handlers[] = { [ESR_ELx_EC_WFx] = kvm_handle_wfx, [ESR_ELx_EC_CP15_32] = kvm_handle_cp15_32, @@ -137,6 +148,7 @@ static int kvm_handle_guest_debug(struct kvm_vcpu *vcpu, struct kvm_run *run) [ESR_ELx_EC_HVC64] = handle_hvc, [ESR_ELx_EC_SMC64] = handle_smc, [ESR_ELx_EC_SYS64] = kvm_handle_sys_reg, + [ESR_ELx_EC_ERET] = kvm_handle_eret, [ESR_ELx_EC_IABT_LOW] = kvm_handle_guest_abort, [ESR_ELx_EC_DABT_LOW] = kvm_handle_guest_abort, [ESR_ELx_EC_SOFTSTP_LOW]= kvm_handle_guest_debug, diff --git a/arch/arm64/kvm/trace.h b/arch/arm64/kvm/trace.h index 7c86cfb..5f40987 100644 --- a/arch/arm64/kvm/trace.h +++ b/arch/arm64/kvm/trace.h @@ -187,6 +187,27 @@ TP_printk("vcpu: %p, inject exception to vEL2: ESR_EL2 0x%lx, vector: 0x%016lx", __entry->vcpu, __entry->esr_el2, __entry->pc) ); + +TRACE_EVENT(kvm_nested_eret, + TP_PROTO(struct kvm_vcpu *vcpu, unsigned long elr_el2, + unsigned long spsr_el2), + TP_ARGS(vcpu, elr_el2, spsr_el2), + + TP_STRUCT__entry( + __field(struct kvm_vcpu *, vcpu) + __field(unsigned long, elr_el2) + __field(unsigned long, spsr_el2) + ), + + TP_fast_assign( + __entry->vcpu = vcpu; + __entry->elr_el2 = elr_el2; + __entry->spsr_el2 = spsr_el2; + ), + + TP_printk("vcpu: %p, eret to elr_el2: 0x%016lx, with spsr_el2: 0x%08lx", + __entry->vcpu, __entry->elr_el2, __entry->spsr_el2) +); #endif /* _TRACE_ARM64_KVM_H */ #undef TRACE_INCLUDE_PATH -- 1.9.1