From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nikolay Nikolaev Subject: [PATCH v2 2/5] KVM: ARM: on IO mem abort - route the call to KVM MMIO bus Date: Sun, 07 Dec 2014 11:37:49 +0200 Message-ID: <20141207093749.17563.12497.stgit@i3820> References: <20141207093641.17563.84226.stgit@i3820> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: tech@virtualopensystems.com, linux-arm-kernel@lists.infradead.org To: kvm@vger.kernel.org, eric.auger@linaro.org, marc.zyngier@arm.com, andre.przywara@arm.com, kvmarm@lists.cs.columbia.edu, christoffer.dall@linaro.org Return-path: Received: from mail-wi0-f177.google.com ([209.85.212.177]:48970 "EHLO mail-wi0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752897AbaLGJhx (ORCPT ); Sun, 7 Dec 2014 04:37:53 -0500 Received: by mail-wi0-f177.google.com with SMTP id l15so2299915wiw.4 for ; Sun, 07 Dec 2014 01:37:52 -0800 (PST) In-Reply-To: <20141207093641.17563.84226.stgit@i3820> Sender: kvm-owner@vger.kernel.org List-ID: On IO memory abort, try to handle the MMIO access thorugh the KVM registered read/write callbacks. This is done by invoking the relevant kvm_io_bus_* API. Signed-off-by: Nikolay Nikolaev --- arch/arm/kvm/mmio.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/arch/arm/kvm/mmio.c b/arch/arm/kvm/mmio.c index 4cb5a93..e42469f 100644 --- a/arch/arm/kvm/mmio.c +++ b/arch/arm/kvm/mmio.c @@ -162,6 +162,36 @@ static int decode_hsr(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, return 0; } +/** + * handle_kernel_mmio - handle an in-kernel MMIO access + * @vcpu: pointer to the vcpu performing the access + * @run: pointer to the kvm_run structure + * @mmio: pointer to the data describing the access + * + * returns true if the MMIO access has been performed in kernel space, + * and false if it needs to be emulated in user space. + */ +static bool handle_kernel_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run, + struct kvm_exit_mmio *mmio) +{ + int ret; + + if (mmio->is_write) { + ret = kvm_io_bus_write(vcpu, KVM_MMIO_BUS, mmio->phys_addr, + mmio->len, &mmio->data); + + } else { + ret = kvm_io_bus_read(vcpu, KVM_MMIO_BUS, mmio->phys_addr, + mmio->len, &mmio->data); + } + if (!ret) { + kvm_prepare_mmio(run, mmio); + kvm_handle_mmio_return(vcpu, run); + } + + return !ret; +} + int io_mem_abort(struct kvm_vcpu *vcpu, struct kvm_run *run, phys_addr_t fault_ipa) { @@ -200,6 +230,9 @@ int io_mem_abort(struct kvm_vcpu *vcpu, struct kvm_run *run, if (vgic_handle_mmio(vcpu, run, &mmio)) return 1; + if (handle_kernel_mmio(vcpu, run, &mmio)) + return 1; + kvm_prepare_mmio(run, &mmio); return 0; }