Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933628AbdCWMqk (ORCPT ); Thu, 23 Mar 2017 08:46:40 -0400 Received: from szxga01-in.huawei.com ([45.249.212.187]:4791 "EHLO dggrg01-dlp.huawei.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S932127AbdCWMqj (ORCPT ); Thu, 23 Mar 2017 08:46:39 -0400 From: Dongjiu Geng To: , , , , , , , , CC: , , , Subject: [PATCH] arm/arm64: KVM: send SIGBUS error to qemu Date: Thu, 23 Mar 2017 21:01:01 +0800 Message-ID: <1490274061-487-1-git-send-email-gengdongjiu@huawei.com> X-Mailer: git-send-email 1.7.7 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.67.187.203] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020204.58D3C373.0243,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2014-11-16 11:51:01, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: d5963c71841fc08d37df01736530680b Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2038 Lines: 66 when the pfn is KVM_PFN_ERR_HWPOISON, it indicates to send SIGBUS signal from KVM's fault-handling code to qemu, qemu can handle this signal according to the fault address. Signed-off-by: Dongjiu Geng --- arch/arm/kvm/mmu.c | 20 ++++++++++++++++++++ include/linux/kvm_host.h | 5 +++++ 2 files changed, 25 insertions(+) diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c index 962616fd4ddd..1307ec400de3 100644 --- a/arch/arm/kvm/mmu.c +++ b/arch/arm/kvm/mmu.c @@ -1237,6 +1237,20 @@ static void coherent_cache_guest_page(struct kvm_vcpu *vcpu, kvm_pfn_t pfn, __coherent_cache_guest_page(vcpu, pfn, size); } +static void kvm_send_hwpoison_signal(unsigned long address, + struct task_struct *tsk) +{ + siginfo_t info; + + info.si_signo = SIGBUS; + info.si_errno = 0; + info.si_code = BUS_MCEERR_AR; + info.si_addr = (void __user *)address; + info.si_addr_lsb = PAGE_SHIFT; + + send_sig_info(SIGBUS, &info, tsk); +} + static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, struct kvm_memory_slot *memslot, unsigned long hva, unsigned long fault_status) @@ -1309,6 +1323,12 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, if (is_error_noslot_pfn(pfn)) return -EFAULT; + if (is_error_hwpoison_pfn(pfn)) { + kvm_send_hwpoison_signal(kvm_vcpu_gfn_to_hva(vcpu, gfn), + current); + return -EFAULT; + } + if (kvm_is_device_pfn(pfn)) { mem_type = PAGE_S2_DEVICE; flags |= KVM_S2PTE_FLAG_IS_IOMAP; diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 2c14ad9809da..610ded9ebe9b 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -91,6 +91,11 @@ static inline bool is_noslot_pfn(kvm_pfn_t pfn) { return pfn == KVM_PFN_NOSLOT; } +/* hwpoison pfn indicates that it needs to send SIGBUS */ +static inline bool is_error_hwpoison_pfn(kvm_pfn_t pfn) +{ + return pfn == KVM_PFN_ERR_HWPOISON; +} /* * architectures with KVM_HVA_ERR_BAD other than PAGE_OFFSET (e.g. s390) -- 2.11.0