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SUSE:SLE-12-SP2:Update
qemu-linux-user
0066-ARM-KVM-Enable-in-kernel-timers-wit.patch
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File 0066-ARM-KVM-Enable-in-kernel-timers-wit.patch of Package qemu-linux-user
From: Alexander Graf <agraf@suse.de> Date: Mon, 19 Sep 2016 10:02:55 +0200 Subject: ARM: KVM: Enable in-kernel timers with user space gic When running with KVM enabled, you can choose between emulating the gic in kernel or user space. If the kernel supports in-kernel virtualization of the interrupt controller, it will default to that. If not, if will default to user space emulation. Unfortunately when running in user mode gic emulation, we miss out on timer events which are only available from kernel space. This patch leverages the new kernel/user space notification mechanism for those timer events. Signed-off-by: Alexander Graf <agraf@suse.de> --- hw/arm/virt.c | 18 ++++++++++++++++++ hw/intc/Makefile.objs | 2 +- hw/intc/arm_gic.c | 16 ++++++++++++++++ linux-headers/linux/kvm.h | 14 ++++++++++++++ target-arm/kvm.c | 29 ++++++++++++++++++++++++++++- target-arm/kvm_arm.h | 11 +++++++++++ 6 files changed, 88 insertions(+), 2 deletions(-) diff --git a/hw/arm/virt.c b/hw/arm/virt.c index 30841de7ad47a5256c5d2d7242da..1b126c1b8f03afe1bc9f37cd5b5d 100644 --- a/hw/arm/virt.c +++ b/hw/arm/virt.c @@ -514,6 +514,24 @@ static void create_gic(VirtBoardInfo *vbi, qemu_irq *pic, int type, bool secure) if (type == 2) { create_v2m(vbi, pic); } + +#ifdef CONFIG_KVM + if (kvm_enabled() && !kvm_irqchip_in_kernel()) { + for (i = 0; i < smp_cpus; i++) { + CPUState *cs = qemu_get_cpu(i); + int ret; + + ret = kvm_vcpu_enable_cap(cs, KVM_CAP_ARM_TIMER, 0, + KVM_ARM_TIMER_VTIMER); + + if (ret) { + error_report("KVM with user space irqchip only works when the " + "host kernel supports KVM_CAP_ARM_TIMER"); + exit(1); + } + } + } +#endif } static void create_uart(const VirtBoardInfo *vbi, qemu_irq *pic, int uart, diff --git a/hw/intc/Makefile.objs b/hw/intc/Makefile.objs index 0e47f0f9ec1a07dd2cef35c1f719..46a8fc5bae3067167997dc98b2d1 100644 --- a/hw/intc/Makefile.objs +++ b/hw/intc/Makefile.objs @@ -10,12 +10,12 @@ common-obj-$(CONFIG_REALVIEW) += realview_gic.o common-obj-$(CONFIG_SLAVIO) += slavio_intctl.o common-obj-$(CONFIG_IOAPIC) += ioapic_common.o common-obj-$(CONFIG_ARM_GIC) += arm_gic_common.o -common-obj-$(CONFIG_ARM_GIC) += arm_gic.o common-obj-$(CONFIG_ARM_GIC) += arm_gicv2m.o common-obj-$(CONFIG_ARM_GIC) += arm_gicv3_common.o common-obj-$(CONFIG_OPENPIC) += openpic.o obj-$(CONFIG_APIC) += apic.o apic_common.o +obj-$(CONFIG_ARM_GIC) += arm_gic.o obj-$(CONFIG_ARM_GIC_KVM) += arm_gic_kvm.o obj-$(call land,$(CONFIG_ARM_GIC_KVM),$(TARGET_AARCH64)) += arm_gicv3_kvm.o obj-$(CONFIG_STELLARIS) += armv7m_nvic.o diff --git a/hw/intc/arm_gic.c b/hw/intc/arm_gic.c index f55124174d312410b7f96e77a984..3758fdac7e9727540c9ffea09922 100644 --- a/hw/intc/arm_gic.c +++ b/hw/intc/arm_gic.c @@ -23,6 +23,7 @@ #include "gic_internal.h" #include "qapi/error.h" #include "qom/cpu.h" +#include "kvm_arm.h" //#define DEBUG_GIC @@ -533,6 +534,11 @@ static void gic_deactivate_irq(GICState *s, int cpu, int irq, MemTxAttrs attrs) return; } + /* Tell KVM that we want to know about timer IRQs again */ + if (kvm_enabled()) { + kvm_arm_eoi_notify(cpu); + } + GIC_CLEAR_ACTIVE(irq, cm); } @@ -542,6 +548,12 @@ void gic_complete_irq(GICState *s, int cpu, int irq, MemTxAttrs attrs) int group; DPRINTF("EOI %d\n", irq); + + /* Tell KVM that we want to know about timer IRQs again */ + if (kvm_enabled()) { + kvm_arm_eoi_notify(cpu); + } + if (irq >= s->num_irq) { /* This handles two cases: * 1. If software writes the ID of a spurious interrupt [ie 1023] @@ -855,6 +867,10 @@ static void gic_dist_writeb(void *opaque, hwaddr offset, DPRINTF("Enabled IRQ %d\n", irq + i); } GIC_SET_ENABLED(irq + i, cm); + /* Tell KVM that we want to know about timer IRQs again */ + if (kvm_enabled()) { + kvm_arm_eoi_notify(cpu); + } /* If a raised level triggered IRQ enabled then mark is as pending. */ if (GIC_TEST_LEVEL(irq + i, mask) diff --git a/linux-headers/linux/kvm.h b/linux-headers/linux/kvm.h index 3bae71a8743ed9b932cff87866d9..8018df294da9e03acf0f7dbc02bb 100644 --- a/linux-headers/linux/kvm.h +++ b/linux-headers/linux/kvm.h @@ -205,6 +205,7 @@ struct kvm_hyperv_exit { #define KVM_EXIT_S390_STSI 25 #define KVM_EXIT_IOAPIC_EOI 26 #define KVM_EXIT_HYPERV 27 +#define KVM_EXIT_ARM_TIMER 28 /* For KVM_EXIT_INTERNAL_ERROR */ /* Emulate instruction failed. */ @@ -361,6 +362,10 @@ struct kvm_run { } eoi; /* KVM_EXIT_HYPERV */ struct kvm_hyperv_exit hyperv; + /* KVM_EXIT_ARM_TIMER */ + struct { + __u8 timesource; + } arm_timer; /* Fix the size of the union. */ char padding[256]; }; @@ -865,6 +870,7 @@ struct kvm_ppc_smmu_info { #define KVM_CAP_SPAPR_TCE_64 125 #define KVM_CAP_ARM_PMU_V3 126 #define KVM_CAP_VCPU_ATTRIBUTES 127 +#define KVM_CAP_ARM_TIMER 133 #ifdef KVM_CAP_IRQ_ROUTING @@ -1312,4 +1318,12 @@ struct kvm_assigned_msix_entry { __u16 padding[3]; }; +/* Available with KVM_CAP_ARM_TIMER */ + +/* Bits for run->request_interrupt_window */ +#define KVM_IRQWINDOW_VTIMER (1 << 0) + +/* Bits for run->arm_timer.timesource */ +#define KVM_ARM_TIMER_VTIMER (1 << 0) + #endif /* __LINUX_KVM_H */ diff --git a/target-arm/kvm.c b/target-arm/kvm.c index 36710320f082ec2aeb5f63ea9a29..9597d0ce490070e278f471997822 100644 --- a/target-arm/kvm.c +++ b/target-arm/kvm.c @@ -529,7 +529,6 @@ MemTxAttrs kvm_arch_post_run(CPUState *cs, struct kvm_run *run) return MEMTXATTRS_UNSPECIFIED; } - int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run) { int ret = 0; @@ -540,6 +539,23 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run) ret = EXCP_DEBUG; } /* otherwise return to guest */ break; + case KVM_EXIT_ARM_TIMER: + /* We only support the vtimer today */ + if (run->arm_timer.timesource != KVM_ARM_TIMER_VTIMER) { + return -EINVAL; + } + + /* + * We ask the kernel to not tell us about pending virtual timer irqs, + * so that we can process the IRQ until we get an EOI for it. Once the + * EOI hits, we unset and unmask the interrupt again and if it is still + * pending, we set the line high again + */ + run->request_interrupt_window = KVM_IRQWINDOW_VTIMER; + + /* Internally trigger virtual timer IRQ */ + qemu_set_irq(ARM_CPU(cs)->gt_timer_outputs[GTIMER_VIRT], 1); + break; default: qemu_log_mask(LOG_UNIMP, "%s: un-handled exit reason %d\n", __func__, run->exit_reason); @@ -626,3 +642,14 @@ int kvm_arch_msi_data_to_gsi(uint32_t data) { return (data - 32) & 0xffff; } + +void kvm_arm_eoi_notify(int cpu) +{ + CPUState *cs; + + cs = qemu_get_cpu(cpu); + + /* Disable vtimer - if it's still pending we get notified again */ + cs->kvm_run->request_interrupt_window &= ~KVM_ARM_TIMER_VTIMER; + qemu_set_irq(ARM_CPU(cs)->gt_timer_outputs[GTIMER_VIRT], 0); +} diff --git a/target-arm/kvm_arm.h b/target-arm/kvm_arm.h index 345233c18bed98f8aaf0eef28311..6704308577f36530d1548dc985de 100644 --- a/target-arm/kvm_arm.h +++ b/target-arm/kvm_arm.h @@ -248,4 +248,15 @@ struct kvm_guest_debug_arch; void kvm_arm_copy_hw_debug_data(struct kvm_guest_debug_arch *ptr); +/** + * kvm_arm_eoi_notify: + * + * @cpu: CPU index the EOI is for + * + * Notify KVM that we're done processing an interrupt. This is + * used to unmask any pending timer interrupts and potentially + * learn about the fact that the level is still high. + */ +void kvm_arm_eoi_notify(int cpu); + #endif
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