[v2,4/9] provide i8259-kvm

This patch provides the file i8259-kvm.c, which implements a schim over
the kvm in-kernel PIC.

Signed-off-by: Glauber Costa <glommer@redhat.com>
---
 Makefile.target |    2 +-
 hw/i8259-kvm.c  |  112 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 hw/pc.c         |    8 +++-
 hw/pc.h         |    1 +
 kvm-all.c       |   26 ++++++++++++-
 kvm.h           |    2 +
 6 files changed, 147 insertions(+), 4 deletions(-)
 create mode 100644 hw/i8259-kvm.c

Glauber Costa wrote:
> This patch provides the file i8259-kvm.c, which implements a schim over
> the kvm in-kernel PIC.
>
> Signed-off-by: Glauber Costa <glommer@redhat.com>
> ---
>  Makefile.target |    2 +-
>  hw/i8259-kvm.c  |  112 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  hw/pc.c         |    8 +++-
>  hw/pc.h         |    1 +
>  kvm-all.c       |   26 ++++++++++++-
>  kvm.h           |    2 +
>  6 files changed, 147 insertions(+), 4 deletions(-)
>  create mode 100644 hw/i8259-kvm.c
>
> diff --git a/Makefile.target b/Makefile.target
> index 6e97ba7..86cf0a5 100644
> --- a/Makefile.target
> +++ b/Makefile.target
> @@ -199,7 +199,7 @@ obj-i386-y += usb-uhci.o vmmouse.o vmport.o vmware_vga.o hpet.o
>  obj-i386-y += device-hotplug.o pci-hotplug.o smbios.o wdt_ib700.o
>  obj-i386-y += ne2000-isa.o
>  
> -obj-i386-$(CONFIG_KVM) += ioapic-kvm.o
> +obj-i386-$(CONFIG_KVM) += ioapic-kvm.o i8259-kvm.o
>  
>  # shared objects
>  obj-ppc-y = ppc.o ide/core.o ide/qdev.o ide/isa.o ide/pci.o ide/macio.o
> diff --git a/hw/i8259-kvm.c b/hw/i8259-kvm.c
> new file mode 100644
> index 0000000..bd6387b
> --- /dev/null
> +++ b/hw/i8259-kvm.c
> @@ -0,0 +1,112 @@
> +#include "hw.h"
> +#include "pc.h"
> +#include "isa.h"
> +#include "monitor.h"
> +#include "qemu-timer.h"
> +#include "kvm.h"
> +
> +static void kvm_i8259_set_irq(void *opaque, int irq, int level)
> +{
> +    int pic_ret;
> +
> +    if (kvm_set_irq(irq, level, &pic_ret)) {
> +        if (pic_ret != 0)
> +            /* In theory, we should not be using any apic state, but we need
> +             * to warn devices such as the rtc about state of delivery. Since this
> +             * one is just a marker, it is no big deal */
> +            apic_set_irq_delivered();
> +        return;
> +    }
> +}
> +
> +static void kvm_pic_reset(void *opaque)
> +{
> +    struct kvm_pic_state *s = opaque;
> +    struct kvm_irqchip *chip;
> +
> +    s->last_irr = 0;
> +    s->irr = 0;
> +    s->imr = 0;
> +    s->isr = 0;
> +    s->priority_add = 0;
> +    s->irq_base = 0;
> +    s->read_reg_select = 0;
> +    s->poll = 0;
> +    s->special_mask = 0;
> +    s->init_state = 0;
> +    s->auto_eoi = 0;
> +    s->rotate_on_auto_eoi = 0;
> +    s->special_fully_nested_mode = 0;
> +    s->init4 = 0;
> +
> +    chip = container_of(s, struct kvm_irqchip, chip.pic);
> +    kvm_set_irqchip(chip);
> +}
> +
> +static void pic_pre_save(void *opaque)
> +{
> +    struct kvm_pic_state *s = opaque;
> +    struct kvm_irqchip *chip;
> +
> +    chip = container_of(s, struct kvm_irqchip, chip.pic);
> +
> +    kvm_get_irqchip(chip);
> +}
> +
> +static int pic_post_load(void *opaque, int version_id)
> +{
> +    struct kvm_pic_state *s = opaque;
> +    struct kvm_irqchip *chip;
> +
> +    chip = container_of(s, struct kvm_irqchip, chip.pic);
> +
> +    return kvm_set_irqchip(chip);
> +}
> +
> +static const VMStateDescription vmstate_kvm_pic = {
> +    .name = "i8259-kvm",
> +    .version_id = 1,
> +    .pre_save = pic_pre_save,
> +    .post_load = pic_post_load,
> +    .minimum_version_id = 1,
> +    .fields      = (VMStateField []) {
> +        VMSTATE_UINT8(last_irr, struct kvm_pic_state),
> +        VMSTATE_UINT8(irr, struct kvm_pic_state),
> +        VMSTATE_UINT8(imr, struct kvm_pic_state),
> +        VMSTATE_UINT8(isr, struct kvm_pic_state),
> +        VMSTATE_UINT8(priority_add, struct kvm_pic_state),
> +        VMSTATE_UINT8(irq_base, struct kvm_pic_state),
> +        VMSTATE_UINT8(read_reg_select, struct kvm_pic_state),
> +        VMSTATE_UINT8(poll, struct kvm_pic_state),
> +        VMSTATE_UINT8(special_mask, struct kvm_pic_state),
> +        VMSTATE_UINT8(init_state, struct kvm_pic_state),
> +        VMSTATE_UINT8(auto_eoi, struct kvm_pic_state),
> +        VMSTATE_UINT8(rotate_on_auto_eoi, struct kvm_pic_state),
> +        VMSTATE_UINT8(special_fully_nested_mode, struct kvm_pic_state),
> +        VMSTATE_UINT8(init4, struct kvm_pic_state),
> +        VMSTATE_UINT8(elcr, struct kvm_pic_state),
> +        VMSTATE_END_OF_LIST()
> +    }
> +};
> +
> +static void kvm_pic_init1(int io_addr, struct kvm_pic_state *s)
> +{
> +    vmstate_register(io_addr, &vmstate_kvm_pic, s);
> +    qemu_register_reset(kvm_pic_reset, s);
> +}
> +
> +qemu_irq *kvm_i8259_init(qemu_irq parent_irq)
> +{
> +    struct kvm_irqchip *master, *slave;
> +
> +    master = qemu_mallocz(sizeof(*master));
> +    slave = qemu_mallocz(sizeof(*slave));
> +
> +    master->chip_id = KVM_IRQCHIP_PIC_MASTER;
> +    slave->chip_id = KVM_IRQCHIP_PIC_SLAVE;
> +
> +    kvm_pic_init1(0x20, &master->chip.pic);
> +    kvm_pic_init1(0xa0, &slave->chip.pic);
> +
> +    return qemu_allocate_irqs(kvm_i8259_set_irq, master, 16);
> +}
> diff --git a/hw/pc.c b/hw/pc.c
> index b7a1734..003ae11 100644
> --- a/hw/pc.c
> +++ b/hw/pc.c
> @@ -1154,8 +1154,14 @@ static void pc_init1(ram_addr_t ram_size,
>      }
>  
>      cpu_irq = qemu_allocate_irqs(pic_irq_request, NULL, 1);
> -    i8259 = i8259_init(cpu_irq[0]);
>      isa_irq_state = qemu_mallocz(sizeof(*isa_irq_state));
> +
> +    if (kvm_enabled() && kvm_irqchip_in_kernel()) {
> +        i8259 = kvm_i8259_init(cpu_irq[0]);
> +    } else {
> +        i8259 = i8259_init(cpu_irq[0]);
> +    }
> +
>      isa_irq_state->i8259 = i8259;
>      isa_irq = qemu_allocate_irqs(isa_irq_handler, isa_irq_state, 24);
>  
> diff --git a/hw/pc.h b/hw/pc.h
> index 4c9b4c3..3d79b9d 100644
> --- a/hw/pc.h
> +++ b/hw/pc.h
> @@ -34,6 +34,7 @@ uint32_t pic_intack_read(PicState2 *s);
>  void pic_info(Monitor *mon);
>  void irq_info(Monitor *mon);
>  
> +qemu_irq *kvm_i8259_init(qemu_irq parent_irq);
>  /* APIC */
>  typedef struct IOAPICState IOAPICState;
>  void apic_deliver_irq(uint8_t dest, uint8_t dest_mode,
> diff --git a/kvm-all.c b/kvm-all.c
> index fc542f3..c46a411 100644
> --- a/kvm-all.c
> +++ b/kvm-all.c
> @@ -391,7 +391,6 @@ int kvm_check_extension(KVMState *s, unsigned int extension)
>      return ret;
>  }
>  
> -#ifdef KVM_CAP_IRQCHIP
>  int kvm_set_irqchip(struct kvm_irqchip *chip)
>  {
>      if (!kvm_state->irqchip_in_kernel) {
> @@ -409,7 +408,30 @@ int kvm_get_irqchip(struct kvm_irqchip *chip)
>  
>      return kvm_vm_ioctl(kvm_state, KVM_GET_IRQCHIP, chip);
>  }
> -#endif
> +
> +int kvm_set_irq(int irq, int level, int *status)
> +{
> +    struct kvm_irq_level event;
> +    int r;
> +
> +    if (!kvm_state->irqchip_in_kernel) {
> +        return 0;
> +    }
> +
> +    event.level = level;
> +    event.irq = irq;
> +
> +    r = kvm_vm_ioctl(kvm_state, KVM_IRQ_LINE_STATUS, &event);
>   

On S390X:

/suse/agraf/work/kvm-s390/qemu.works/kvm-all.c: In function ‘kvm_set_irq’:
/suse/agraf/work/kvm-s390/qemu.works/kvm-all.c:425: error:
‘KVM_IRQ_LINE_STATUS’ undeclared (first use in this function)
/suse/agraf/work/kvm-s390/qemu.works/kvm-all.c:425: error: (Each
undeclared identifier is reported only once
/suse/agraf/work/kvm-s390/qemu.works/kvm-all.c:425: error: for each
function it appears in.)
/suse/agraf/work/kvm-s390/qemu.works/kvm-all.c:431: error: ‘struct
kvm_irq_level’ has no member named ‘status’


Alex

> 
> On S390X:
> 
> /suse/agraf/work/kvm-s390/qemu.works/kvm-all.c: In function ‘kvm_set_irq’:
> /suse/agraf/work/kvm-s390/qemu.works/kvm-all.c:425: error:
> ‘KVM_IRQ_LINE_STATUS’ undeclared (first use in this function)
> /suse/agraf/work/kvm-s390/qemu.works/kvm-all.c:425: error: (Each
> undeclared identifier is reported only once
> /suse/agraf/work/kvm-s390/qemu.works/kvm-all.c:425: error: for each
> function it appears in.)
> /suse/agraf/work/kvm-s390/qemu.works/kvm-all.c:431: error: ‘struct
> kvm_irq_level’ has no member named ‘status’

Yeah.

As we talked, I tested all targets, but only in x86 hosts, which is what I
have handy. I will re-send another version