From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Fedin Subject: [PATCH v2 0/3] KVM: arm/arm64: Allow to use KVM without in-kernel irqchip Date: Tue, 14 Jul 2015 15:06:02 +0300 Message-ID: Cc: Marc Zyngier , Christoffer Dall , Eric Auger To: kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Return-path: Received: from mailout2.w1.samsung.com ([210.118.77.12]:20960 "EHLO mailout2.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751595AbbGNMGM (ORCPT ); Tue, 14 Jul 2015 08:06:12 -0400 Received: from eucpsbgm1.samsung.com (unknown [203.254.199.244]) by mailout2.w1.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTP id <0NRH006338AAR880@mailout2.w1.samsung.com> for kvm@vger.kernel.org; Tue, 14 Jul 2015 13:06:10 +0100 (BST) Sender: kvm-owner@vger.kernel.org List-ID: This patch set brings back functionality which was broken in v4.1. The overall goal is to eventually enable using virtual timer too, but for now changes affect only a possibility to run KVM itself. The guest currently has to use another timer because there's no API to propagate interrupts from in-kernel virtual timer to the interrupt controller emulated in userspace. v1=>v2: - Do not use defensive approach in patch 0001. Use correct conditions in callers instead - Added ARM64-specific code, without which attempt to run a VM ends in a HYP crash because of unset vGIC save/restore function pointers Christoffer Dall: I decided to leave original approach of 0002 as it is, because: - It is much simpler to implement than doing changes inside both probe functions. - These are all use cases for vgic_present flag. Nothing else is going to rely on it. IMHO this switch is very short and stylish :) If you don't like two error codes, we could change -ENXIO to -ENODEV where appropriate, this change would be small enough. Actually i tried to discuss some things with you, but you stopped replying, therefore i respin in order to revive the thing. On top of this i have complete implementation of API which allows to emulate GIC in userspace by qemu, and now i can run any virtual machine, including generic timer, on vGIC-less machine. RasPI-2 is expected to benefit too. Pavel Fedin (3): KVM: arm: Fix NULL pointer dereference if KVM is used without in-kernel irqchip KVM: arm: Detect vGIC presence at runtime KVM: arm64: Introduce default dummy save/restore functions arch/arm/include/asm/kvm_host.h | 5 +++++ arch/arm/kvm/arm.c | 24 +++++++++++++++++++++--- arch/arm64/include/asm/kvm_asm.h | 1 + arch/arm64/include/asm/kvm_host.h | 8 ++++++++ arch/arm64/kvm/vgic-v2-switch.S | 5 +++++ virt/kvm/arm/vgic.c | 2 ++ 6 files changed, 42 insertions(+), 3 deletions(-) -- 2.4.4