From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933086AbcAYPyU (ORCPT ); Mon, 25 Jan 2016 10:54:20 -0500 Received: from foss.arm.com ([217.140.101.70]:38477 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932884AbcAYPyP (ORCPT ); Mon, 25 Jan 2016 10:54:15 -0500 From: Marc Zyngier To: Catalin Marinas , Will Deacon , Christoffer Dall Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu Subject: [PATCH v2 00/21] arm64: Virtualization Host Extension support Date: Mon, 25 Jan 2016 15:53:34 +0000 Message-Id: <1453737235-16522-1-git-send-email-marc.zyngier@arm.com> X-Mailer: git-send-email 2.1.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ARMv8.1 comes with the "Virtualization Host Extension" (VHE for short), which enables simpler support of Type-2 hypervisors. This extension allows the kernel to directly run at EL2, and significantly reduces the number of system registers shared between host and guest, reducing the overhead of virtualization. In order to have the same kernel binary running on all versions of the architecture, this series makes heavy use of runtime code patching. The first 20 patches massage the KVM code to deal with VHE and enable Linux to run at EL2. The last patch catches an ugly case when VHE capable CPUs are paired with some of their less capable siblings. This should never happen, but hey... I have deliberately left out some of the more "advanced" optimizations, as they are likely to distract the reviewer from the core infrastructure, which is what I care about at the moment. A few things to note: - Given that the code has been almost entierely rewritten, I've dropped all Acks from the new patches - GDB is currently busted on VHE systems, as it checks for version 6 on the debug architecture, while VHE is version 7. The binutils people are on the case. This has been tested on the FVP_Base_SLV-V8-A model, and based on v4.5-rc1. I've put a branch out on: git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git kvm-arm64/vhe * From v1: - Full rewrite now that the World Switch is written in C code. - Dropped the "early IRQ handling" for the moment. Marc Zyngier (21): arm/arm64: Add new is_kernel_in_hyp_mode predicate arm64: Allow the arch timer to use the HYP timer arm64: Add ARM64_HAS_VIRT_HOST_EXTN feature arm64: KVM: Skip HYP setup when already running in HYP arm64: KVM: VHE: Turn VTCR_EL2 setup into a reusable macro arm64: KVM: VHE: Patch out use of HVC arm64: KVM: VHE: Patch out kern_hyp_va arm64: KVM: VHE: Introduce unified system register accessors arm64: KVM: VHE: Differenciate host/guest sysreg save/restore arm64: KVM: VHE: Split save/restore of sysregs shared between EL1 and EL2 arm64: KVM: VHE: Use unified system register accessors arm64: KVM: VHE: Enable minimal sysreg save/restore arm64: KVM: VHE: Make __fpsimd_enabled VHE aware arm64: KVM: VHE: Implement VHE activate/deactivate_traps arm64: KVM: VHE: Use unified sysreg accessors for timer arm64: KVM: VHE: Add fpsimd enabling on guest access arm64: KVM: VHE: Add alternative panic handling arm64: KVM: Introduce hyp_alternate_value helper arm64: KVM: Move most of the fault decoding to C arm64: VHE: Add support for running Linux in EL2 mode arm64: Panic when VHE and non VHE CPUs coexist arch/arm/include/asm/virt.h | 5 ++ arch/arm/kvm/arm.c | 151 +++++++++++++++++++------------ arch/arm/kvm/mmu.c | 7 ++ arch/arm64/Kconfig | 13 +++ arch/arm64/include/asm/cpufeature.h | 3 +- arch/arm64/include/asm/kvm_arm.h | 1 + arch/arm64/include/asm/kvm_emulate.h | 3 + arch/arm64/include/asm/kvm_mmu.h | 34 ++++++- arch/arm64/include/asm/virt.h | 27 ++++++ arch/arm64/kernel/asm-offsets.c | 3 - arch/arm64/kernel/cpufeature.c | 15 +++- arch/arm64/kernel/head.S | 51 ++++++++++- arch/arm64/kernel/smp.c | 3 + arch/arm64/kvm/hyp-init.S | 18 +--- arch/arm64/kvm/hyp.S | 7 ++ arch/arm64/kvm/hyp/entry.S | 6 ++ arch/arm64/kvm/hyp/hyp-entry.S | 107 +++++++--------------- arch/arm64/kvm/hyp/hyp.h | 119 ++++++++++++++++++++++-- arch/arm64/kvm/hyp/switch.c | 170 +++++++++++++++++++++++++++++++---- arch/arm64/kvm/hyp/sysreg-sr.c | 147 ++++++++++++++++++++---------- arch/arm64/kvm/hyp/timer-sr.c | 10 +-- drivers/clocksource/arm_arch_timer.c | 96 ++++++++++++-------- 22 files changed, 724 insertions(+), 272 deletions(-) -- 2.1.4 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marc Zyngier Subject: [PATCH v2 00/21] arm64: Virtualization Host Extension support Date: Mon, 25 Jan 2016 15:53:34 +0000 Message-ID: <1453737235-16522-1-git-send-email-marc.zyngier@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org To: Catalin Marinas , Will Deacon , Christoffer Dall Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu List-Id: kvm.vger.kernel.org ARMv8.1 comes with the "Virtualization Host Extension" (VHE for short), which enables simpler support of Type-2 hypervisors. This extension allows the kernel to directly run at EL2, and significantly reduces the number of system registers shared between host and guest, reducing the overhead of virtualization. In order to have the same kernel binary running on all versions of the architecture, this series makes heavy use of runtime code patching. The first 20 patches massage the KVM code to deal with VHE and enable Linux to run at EL2. The last patch catches an ugly case when VHE capable CPUs are paired with some of their less capable siblings. This should never happen, but hey... I have deliberately left out some of the more "advanced" optimizations, as they are likely to distract the reviewer from the core infrastructure, which is what I care about at the moment. A few things to note: - Given that the code has been almost entierely rewritten, I've dropped all Acks from the new patches - GDB is currently busted on VHE systems, as it checks for version 6 on the debug architecture, while VHE is version 7. The binutils people are on the case. This has been tested on the FVP_Base_SLV-V8-A model, and based on v4.5-rc1. I've put a branch out on: git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git kvm-arm64/vhe * From v1: - Full rewrite now that the World Switch is written in C code. - Dropped the "early IRQ handling" for the moment. Marc Zyngier (21): arm/arm64: Add new is_kernel_in_hyp_mode predicate arm64: Allow the arch timer to use the HYP timer arm64: Add ARM64_HAS_VIRT_HOST_EXTN feature arm64: KVM: Skip HYP setup when already running in HYP arm64: KVM: VHE: Turn VTCR_EL2 setup into a reusable macro arm64: KVM: VHE: Patch out use of HVC arm64: KVM: VHE: Patch out kern_hyp_va arm64: KVM: VHE: Introduce unified system register accessors arm64: KVM: VHE: Differenciate host/guest sysreg save/restore arm64: KVM: VHE: Split save/restore of sysregs shared between EL1 and EL2 arm64: KVM: VHE: Use unified system register accessors arm64: KVM: VHE: Enable minimal sysreg save/restore arm64: KVM: VHE: Make __fpsimd_enabled VHE aware arm64: KVM: VHE: Implement VHE activate/deactivate_traps arm64: KVM: VHE: Use unified sysreg accessors for timer arm64: KVM: VHE: Add fpsimd enabling on guest access arm64: KVM: VHE: Add alternative panic handling arm64: KVM: Introduce hyp_alternate_value helper arm64: KVM: Move most of the fault decoding to C arm64: VHE: Add support for running Linux in EL2 mode arm64: Panic when VHE and non VHE CPUs coexist arch/arm/include/asm/virt.h | 5 ++ arch/arm/kvm/arm.c | 151 +++++++++++++++++++------------ arch/arm/kvm/mmu.c | 7 ++ arch/arm64/Kconfig | 13 +++ arch/arm64/include/asm/cpufeature.h | 3 +- arch/arm64/include/asm/kvm_arm.h | 1 + arch/arm64/include/asm/kvm_emulate.h | 3 + arch/arm64/include/asm/kvm_mmu.h | 34 ++++++- arch/arm64/include/asm/virt.h | 27 ++++++ arch/arm64/kernel/asm-offsets.c | 3 - arch/arm64/kernel/cpufeature.c | 15 +++- arch/arm64/kernel/head.S | 51 ++++++++++- arch/arm64/kernel/smp.c | 3 + arch/arm64/kvm/hyp-init.S | 18 +--- arch/arm64/kvm/hyp.S | 7 ++ arch/arm64/kvm/hyp/entry.S | 6 ++ arch/arm64/kvm/hyp/hyp-entry.S | 107 +++++++--------------- arch/arm64/kvm/hyp/hyp.h | 119 ++++++++++++++++++++++-- arch/arm64/kvm/hyp/switch.c | 170 +++++++++++++++++++++++++++++++---- arch/arm64/kvm/hyp/sysreg-sr.c | 147 ++++++++++++++++++++---------- arch/arm64/kvm/hyp/timer-sr.c | 10 +-- drivers/clocksource/arm_arch_timer.c | 96 ++++++++++++-------- 22 files changed, 724 insertions(+), 272 deletions(-) -- 2.1.4 From mboxrd@z Thu Jan 1 00:00:00 1970 From: marc.zyngier@arm.com (Marc Zyngier) Date: Mon, 25 Jan 2016 15:53:34 +0000 Subject: [PATCH v2 00/21] arm64: Virtualization Host Extension support Message-ID: <1453737235-16522-1-git-send-email-marc.zyngier@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org ARMv8.1 comes with the "Virtualization Host Extension" (VHE for short), which enables simpler support of Type-2 hypervisors. This extension allows the kernel to directly run at EL2, and significantly reduces the number of system registers shared between host and guest, reducing the overhead of virtualization. In order to have the same kernel binary running on all versions of the architecture, this series makes heavy use of runtime code patching. The first 20 patches massage the KVM code to deal with VHE and enable Linux to run at EL2. The last patch catches an ugly case when VHE capable CPUs are paired with some of their less capable siblings. This should never happen, but hey... I have deliberately left out some of the more "advanced" optimizations, as they are likely to distract the reviewer from the core infrastructure, which is what I care about at the moment. A few things to note: - Given that the code has been almost entierely rewritten, I've dropped all Acks from the new patches - GDB is currently busted on VHE systems, as it checks for version 6 on the debug architecture, while VHE is version 7. The binutils people are on the case. This has been tested on the FVP_Base_SLV-V8-A model, and based on v4.5-rc1. I've put a branch out on: git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git kvm-arm64/vhe * From v1: - Full rewrite now that the World Switch is written in C code. - Dropped the "early IRQ handling" for the moment. Marc Zyngier (21): arm/arm64: Add new is_kernel_in_hyp_mode predicate arm64: Allow the arch timer to use the HYP timer arm64: Add ARM64_HAS_VIRT_HOST_EXTN feature arm64: KVM: Skip HYP setup when already running in HYP arm64: KVM: VHE: Turn VTCR_EL2 setup into a reusable macro arm64: KVM: VHE: Patch out use of HVC arm64: KVM: VHE: Patch out kern_hyp_va arm64: KVM: VHE: Introduce unified system register accessors arm64: KVM: VHE: Differenciate host/guest sysreg save/restore arm64: KVM: VHE: Split save/restore of sysregs shared between EL1 and EL2 arm64: KVM: VHE: Use unified system register accessors arm64: KVM: VHE: Enable minimal sysreg save/restore arm64: KVM: VHE: Make __fpsimd_enabled VHE aware arm64: KVM: VHE: Implement VHE activate/deactivate_traps arm64: KVM: VHE: Use unified sysreg accessors for timer arm64: KVM: VHE: Add fpsimd enabling on guest access arm64: KVM: VHE: Add alternative panic handling arm64: KVM: Introduce hyp_alternate_value helper arm64: KVM: Move most of the fault decoding to C arm64: VHE: Add support for running Linux in EL2 mode arm64: Panic when VHE and non VHE CPUs coexist arch/arm/include/asm/virt.h | 5 ++ arch/arm/kvm/arm.c | 151 +++++++++++++++++++------------ arch/arm/kvm/mmu.c | 7 ++ arch/arm64/Kconfig | 13 +++ arch/arm64/include/asm/cpufeature.h | 3 +- arch/arm64/include/asm/kvm_arm.h | 1 + arch/arm64/include/asm/kvm_emulate.h | 3 + arch/arm64/include/asm/kvm_mmu.h | 34 ++++++- arch/arm64/include/asm/virt.h | 27 ++++++ arch/arm64/kernel/asm-offsets.c | 3 - arch/arm64/kernel/cpufeature.c | 15 +++- arch/arm64/kernel/head.S | 51 ++++++++++- arch/arm64/kernel/smp.c | 3 + arch/arm64/kvm/hyp-init.S | 18 +--- arch/arm64/kvm/hyp.S | 7 ++ arch/arm64/kvm/hyp/entry.S | 6 ++ arch/arm64/kvm/hyp/hyp-entry.S | 107 +++++++--------------- arch/arm64/kvm/hyp/hyp.h | 119 ++++++++++++++++++++++-- arch/arm64/kvm/hyp/switch.c | 170 +++++++++++++++++++++++++++++++---- arch/arm64/kvm/hyp/sysreg-sr.c | 147 ++++++++++++++++++++---------- arch/arm64/kvm/hyp/timer-sr.c | 10 +-- drivers/clocksource/arm_arch_timer.c | 96 ++++++++++++-------- 22 files changed, 724 insertions(+), 272 deletions(-) -- 2.1.4