From: Marc Zyngier <marc.zyngier@arm.com> To: Paolo Bonzini <pbonzini@redhat.com> Cc: Jisheng Zhang <jszhang@marvell.com>, kvm@vger.kernel.org, Gleb Natapov <gleb@kernel.org>, Catalin Marinas <catalin.marinas@arm.com>, linux-arm-kernel@lists.infradead.org, David Binderman <dcb314@hotmail.com>, Fengguang Wu <fengguang.wu@intel.com>, kvmarm@lists.cs.columbia.edu Subject: [PATCH 08/31] arm64: KVM: Implement timer save/restore Date: Thu, 24 Dec 2015 11:12:16 +0000 [thread overview] Message-ID: <1450955559-15639-9-git-send-email-marc.zyngier@arm.com> (raw) In-Reply-To: <1450955559-15639-1-git-send-email-marc.zyngier@arm.com> Implement the timer save restore as a direct translation of the assembly code version. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> --- arch/arm64/kvm/hyp/Makefile | 1 + arch/arm64/kvm/hyp/hyp.h | 3 ++ arch/arm64/kvm/hyp/timer-sr.c | 71 ++++++++++++++++++++++++++++++++++++ include/clocksource/arm_arch_timer.h | 6 +++ 4 files changed, 81 insertions(+) create mode 100644 arch/arm64/kvm/hyp/timer-sr.c diff --git a/arch/arm64/kvm/hyp/Makefile b/arch/arm64/kvm/hyp/Makefile index d1e38ce..455dc0a 100644 --- a/arch/arm64/kvm/hyp/Makefile +++ b/arch/arm64/kvm/hyp/Makefile @@ -4,3 +4,4 @@ obj-$(CONFIG_KVM_ARM_HOST) += vgic-v2-sr.o obj-$(CONFIG_KVM_ARM_HOST) += vgic-v3-sr.o +obj-$(CONFIG_KVM_ARM_HOST) += timer-sr.o diff --git a/arch/arm64/kvm/hyp/hyp.h b/arch/arm64/kvm/hyp/hyp.h index 5759f9f..f213e46 100644 --- a/arch/arm64/kvm/hyp/hyp.h +++ b/arch/arm64/kvm/hyp/hyp.h @@ -35,5 +35,8 @@ void __vgic_v2_restore_state(struct kvm_vcpu *vcpu); void __vgic_v3_save_state(struct kvm_vcpu *vcpu); void __vgic_v3_restore_state(struct kvm_vcpu *vcpu); +void __timer_save_state(struct kvm_vcpu *vcpu); +void __timer_restore_state(struct kvm_vcpu *vcpu); + #endif /* __ARM64_KVM_HYP_H__ */ diff --git a/arch/arm64/kvm/hyp/timer-sr.c b/arch/arm64/kvm/hyp/timer-sr.c new file mode 100644 index 0000000..1051e5d --- /dev/null +++ b/arch/arm64/kvm/hyp/timer-sr.c @@ -0,0 +1,71 @@ +/* + * Copyright (C) 2012-2015 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <clocksource/arm_arch_timer.h> +#include <linux/compiler.h> +#include <linux/kvm_host.h> + +#include <asm/kvm_mmu.h> + +#include "hyp.h" + +/* vcpu is already in the HYP VA space */ +void __hyp_text __timer_save_state(struct kvm_vcpu *vcpu) +{ + struct kvm *kvm = kern_hyp_va(vcpu->kvm); + struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; + u64 val; + + if (kvm->arch.timer.enabled) { + timer->cntv_ctl = read_sysreg(cntv_ctl_el0); + timer->cntv_cval = read_sysreg(cntv_cval_el0); + } + + /* Disable the virtual timer */ + write_sysreg(0, cntv_ctl_el0); + + /* Allow physical timer/counter access for the host */ + val = read_sysreg(cnthctl_el2); + val |= CNTHCTL_EL1PCTEN | CNTHCTL_EL1PCEN; + write_sysreg(val, cnthctl_el2); + + /* Clear cntvoff for the host */ + write_sysreg(0, cntvoff_el2); +} + +void __hyp_text __timer_restore_state(struct kvm_vcpu *vcpu) +{ + struct kvm *kvm = kern_hyp_va(vcpu->kvm); + struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; + u64 val; + + /* + * Disallow physical timer access for the guest + * Physical counter access is allowed + */ + val = read_sysreg(cnthctl_el2); + val &= ~CNTHCTL_EL1PCEN; + val |= CNTHCTL_EL1PCTEN; + write_sysreg(val, cnthctl_el2); + + if (kvm->arch.timer.enabled) { + write_sysreg(kvm->arch.timer.cntvoff, cntvoff_el2); + write_sysreg(timer->cntv_cval, cntv_cval_el0); + isb(); + write_sysreg(timer->cntv_ctl, cntv_ctl_el0); + } +} diff --git a/include/clocksource/arm_arch_timer.h b/include/clocksource/arm_arch_timer.h index 9916d0e..25d0914 100644 --- a/include/clocksource/arm_arch_timer.h +++ b/include/clocksource/arm_arch_timer.h @@ -23,6 +23,12 @@ #define ARCH_TIMER_CTRL_IT_MASK (1 << 1) #define ARCH_TIMER_CTRL_IT_STAT (1 << 2) +#define CNTHCTL_EL1PCTEN (1 << 0) +#define CNTHCTL_EL1PCEN (1 << 1) +#define CNTHCTL_EVNTEN (1 << 2) +#define CNTHCTL_EVNTDIR (1 << 3) +#define CNTHCTL_EVNTI (0xF << 4) + enum arch_timer_reg { ARCH_TIMER_REG_CTRL, ARCH_TIMER_REG_TVAL, -- 2.1.4
WARNING: multiple messages have this Message-ID (diff)
From: marc.zyngier@arm.com (Marc Zyngier) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 08/31] arm64: KVM: Implement timer save/restore Date: Thu, 24 Dec 2015 11:12:16 +0000 [thread overview] Message-ID: <1450955559-15639-9-git-send-email-marc.zyngier@arm.com> (raw) In-Reply-To: <1450955559-15639-1-git-send-email-marc.zyngier@arm.com> Implement the timer save restore as a direct translation of the assembly code version. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> --- arch/arm64/kvm/hyp/Makefile | 1 + arch/arm64/kvm/hyp/hyp.h | 3 ++ arch/arm64/kvm/hyp/timer-sr.c | 71 ++++++++++++++++++++++++++++++++++++ include/clocksource/arm_arch_timer.h | 6 +++ 4 files changed, 81 insertions(+) create mode 100644 arch/arm64/kvm/hyp/timer-sr.c diff --git a/arch/arm64/kvm/hyp/Makefile b/arch/arm64/kvm/hyp/Makefile index d1e38ce..455dc0a 100644 --- a/arch/arm64/kvm/hyp/Makefile +++ b/arch/arm64/kvm/hyp/Makefile @@ -4,3 +4,4 @@ obj-$(CONFIG_KVM_ARM_HOST) += vgic-v2-sr.o obj-$(CONFIG_KVM_ARM_HOST) += vgic-v3-sr.o +obj-$(CONFIG_KVM_ARM_HOST) += timer-sr.o diff --git a/arch/arm64/kvm/hyp/hyp.h b/arch/arm64/kvm/hyp/hyp.h index 5759f9f..f213e46 100644 --- a/arch/arm64/kvm/hyp/hyp.h +++ b/arch/arm64/kvm/hyp/hyp.h @@ -35,5 +35,8 @@ void __vgic_v2_restore_state(struct kvm_vcpu *vcpu); void __vgic_v3_save_state(struct kvm_vcpu *vcpu); void __vgic_v3_restore_state(struct kvm_vcpu *vcpu); +void __timer_save_state(struct kvm_vcpu *vcpu); +void __timer_restore_state(struct kvm_vcpu *vcpu); + #endif /* __ARM64_KVM_HYP_H__ */ diff --git a/arch/arm64/kvm/hyp/timer-sr.c b/arch/arm64/kvm/hyp/timer-sr.c new file mode 100644 index 0000000..1051e5d --- /dev/null +++ b/arch/arm64/kvm/hyp/timer-sr.c @@ -0,0 +1,71 @@ +/* + * Copyright (C) 2012-2015 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <clocksource/arm_arch_timer.h> +#include <linux/compiler.h> +#include <linux/kvm_host.h> + +#include <asm/kvm_mmu.h> + +#include "hyp.h" + +/* vcpu is already in the HYP VA space */ +void __hyp_text __timer_save_state(struct kvm_vcpu *vcpu) +{ + struct kvm *kvm = kern_hyp_va(vcpu->kvm); + struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; + u64 val; + + if (kvm->arch.timer.enabled) { + timer->cntv_ctl = read_sysreg(cntv_ctl_el0); + timer->cntv_cval = read_sysreg(cntv_cval_el0); + } + + /* Disable the virtual timer */ + write_sysreg(0, cntv_ctl_el0); + + /* Allow physical timer/counter access for the host */ + val = read_sysreg(cnthctl_el2); + val |= CNTHCTL_EL1PCTEN | CNTHCTL_EL1PCEN; + write_sysreg(val, cnthctl_el2); + + /* Clear cntvoff for the host */ + write_sysreg(0, cntvoff_el2); +} + +void __hyp_text __timer_restore_state(struct kvm_vcpu *vcpu) +{ + struct kvm *kvm = kern_hyp_va(vcpu->kvm); + struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; + u64 val; + + /* + * Disallow physical timer access for the guest + * Physical counter access is allowed + */ + val = read_sysreg(cnthctl_el2); + val &= ~CNTHCTL_EL1PCEN; + val |= CNTHCTL_EL1PCTEN; + write_sysreg(val, cnthctl_el2); + + if (kvm->arch.timer.enabled) { + write_sysreg(kvm->arch.timer.cntvoff, cntvoff_el2); + write_sysreg(timer->cntv_cval, cntv_cval_el0); + isb(); + write_sysreg(timer->cntv_ctl, cntv_ctl_el0); + } +} diff --git a/include/clocksource/arm_arch_timer.h b/include/clocksource/arm_arch_timer.h index 9916d0e..25d0914 100644 --- a/include/clocksource/arm_arch_timer.h +++ b/include/clocksource/arm_arch_timer.h @@ -23,6 +23,12 @@ #define ARCH_TIMER_CTRL_IT_MASK (1 << 1) #define ARCH_TIMER_CTRL_IT_STAT (1 << 2) +#define CNTHCTL_EL1PCTEN (1 << 0) +#define CNTHCTL_EL1PCEN (1 << 1) +#define CNTHCTL_EVNTEN (1 << 2) +#define CNTHCTL_EVNTDIR (1 << 3) +#define CNTHCTL_EVNTI (0xF << 4) + enum arch_timer_reg { ARCH_TIMER_REG_CTRL, ARCH_TIMER_REG_TVAL, -- 2.1.4
next prev parent reply other threads:[~2015-12-24 11:12 UTC|newest] Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-12-24 11:12 [PULL] KVM/ARM updates for 4.5 Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 01/31] KVM: arm/arm64: vgic: make vgic_io_ops static Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 02/31] KVM: arm/arm64: Count guest exit due to various reasons Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 03/31] arm64: Add macros to read/write system registers Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 04/31] arm64: KVM: Add a HYP-specific header file Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 05/31] arm64: KVM: Implement vgic-v2 save/restore Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 06/31] KVM: arm/arm64: vgic-v3: Make the LR indexing macro public Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 07/31] arm64: KVM: Implement vgic-v3 save/restore Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier [this message] 2015-12-24 11:12 ` [PATCH 08/31] arm64: KVM: Implement timer save/restore Marc Zyngier 2015-12-24 11:12 ` [PATCH 09/31] arm64: KVM: Implement system register save/restore Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 10/31] arm64: KVM: Implement 32bit " Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 11/31] arm64: KVM: Implement debug save/restore Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 12/31] arm64: KVM: Implement guest entry Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 13/31] arm64: KVM: Add patchable function selector Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 14/31] arm64: KVM: Implement the core world switch Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 15/31] arm64: KVM: Implement fpsimd save/restore Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 16/31] arm64: KVM: Implement TLB handling Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 17/31] arm64: KVM: HYP mode entry points Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 18/31] arm64: KVM: Add panic handling Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 19/31] arm64: KVM: Add compatibility aliases Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 20/31] arm64: KVM: Map the kernel RO section into HYP Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 21/31] arm64: KVM: Move away from the assembly version of the world switch Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 22/31] arm64: KVM: Turn system register numbers to an enum Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 23/31] arm64: KVM: Cleanup asm-offset.c Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 24/31] arm64: KVM: Remove weak attributes Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 25/31] ARM: KVM: Cleanup exception injection Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 26/31] arm64: KVM: debug: Remove spurious inline attributes Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 27/31] arm/arm64: KVM: Remove unreferenced S2_PGD_ORDER Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 28/31] arm: KVM: Make kvm_arm.h friendly to assembly code Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 29/31] arm64: KVM: Add support for 16-bit VMID Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 30/31] MAINTAINERS: add git URL for KVM/ARM Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2015-12-24 11:12 ` [PATCH 31/31] arm/arm64: KVM: Detect vGIC presence at runtime Marc Zyngier 2015-12-24 11:12 ` Marc Zyngier 2016-01-07 10:07 ` [PULL] KVM/ARM updates for 4.5 Paolo Bonzini 2016-01-07 10:07 ` Paolo Bonzini
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