Re: [Qemu-devel] [PATCH v6 08/16] hw/vfio: create common module

[Alexander Graf <agraf@suse.de>]

On 09.09.14 09:31, Eric Auger wrote:
> A new common module is created. It implements all functions
> that have no device specificity (PCI, Platform).
> 
> This patch only consists in move (no functional changes)
> 
> Signed-off-by: Kim Phillips <kim.phillips@linaro.org>
> Signed-off-by: Eric Auger <eric.auger@linaro.org>
> 
> ---
> v5 -> v6:
> - follow all evolutions of original PCI code from v5 to V6
> - move declaration of vfio_region_ops, vfio_memory_listener,
>   vfio_group_list, vfio_address_spaces into vfio-common.h
> 
> v4 -> v5:
> - integrate "sPAPR/IOMMU: Fix TCE entry permission"
> - VFIOdevice .name dealloc removed from vfio_put_base_device
> - add some includes according to vfio inclusion policy
> 
> v3 -> v4:
> [Eric Auger]
> move done after all PCI modifications to anticipate for
> VFIO Platform needs. Purpose is to alleviate the whole
> review process.
> 
> <= v3
> First split done by Kim Phillips
> ---
>  hw/vfio/Makefile.objs         |    1 +
>  hw/vfio/common.c              |  958 ++++++++++++++++++++++++++++++++++++++
>  hw/vfio/pci.c                 | 1028 +----------------------------------------
>  include/hw/vfio/vfio-common.h |  152 ++++++
>  trace-events                  |    1 +
>  5 files changed, 1113 insertions(+), 1027 deletions(-)
>  create mode 100644 hw/vfio/common.c
>  create mode 100644 include/hw/vfio/vfio-common.h
> 
> diff --git a/hw/vfio/Makefile.objs b/hw/vfio/Makefile.objs
> index 31c7dab..e31f30e 100644
> --- a/hw/vfio/Makefile.objs
> +++ b/hw/vfio/Makefile.objs
> @@ -1,3 +1,4 @@
>  ifeq ($(CONFIG_LINUX), y)
> +obj-$(CONFIG_SOFTMMU) += common.o
>  obj-$(CONFIG_PCI) += pci.o
>  endif
> diff --git a/hw/vfio/common.c b/hw/vfio/common.c
> new file mode 100644
> index 0000000..252c0b8
> --- /dev/null
> +++ b/hw/vfio/common.c
> @@ -0,0 +1,958 @@
> +/*
> + * generic functions used by VFIO devices
> + *
> + * Copyright Red Hat, Inc. 2012
> + *
> + * Authors:
> + *  Alex Williamson <alex.williamson@redhat.com>
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2.  See
> + * the COPYING file in the top-level directory.
> + *
> + * Based on qemu-kvm device-assignment:
> + *  Adapted for KVM by Qumranet.
> + *  Copyright (c) 2007, Neocleus, Alex Novik (alex@neocleus.com)
> + *  Copyright (c) 2007, Neocleus, Guy Zana (guy@neocleus.com)
> + *  Copyright (C) 2008, Qumranet, Amit Shah (amit.shah@qumranet.com)
> + *  Copyright (C) 2008, Red Hat, Amit Shah (amit.shah@redhat.com)
> + *  Copyright (C) 2008, IBM, Muli Ben-Yehuda (muli@il.ibm.com)
> + */
> +
> +#include <sys/ioctl.h>
> +#include <sys/mman.h>
> +#include <linux/vfio.h>
> +
> +#include "hw/vfio/vfio-common.h"
> +#include "hw/vfio/vfio.h"
> +#include "exec/address-spaces.h"
> +#include "exec/memory.h"
> +#include "hw/hw.h"
> +#include "qemu/error-report.h"
> +#include "sysemu/kvm.h"
> +#include "trace.h"
> +
> +struct vfio_group_head vfio_group_list =
> +    QLIST_HEAD_INITIALIZER(vfio_address_spaces);
> +struct vfio_as_head vfio_address_spaces =
> +    QLIST_HEAD_INITIALIZER(vfio_address_spaces);
> +
> +#ifdef CONFIG_KVM
> +/*
> + * We have a single VFIO pseudo device per KVM VM.  Once created it lives
> + * for the life of the VM.  Closing the file descriptor only drops our
> + * reference to it and the device's reference to kvm.  Therefore once
> + * initialized, this file descriptor is only released on QEMU exit and
> + * we'll re-use it should another vfio device be attached before then.
> + */
> +static int vfio_kvm_device_fd = -1;
> +#endif
> +
> +/*
> + * Common VFIO interrupt disable
> + */
> +void vfio_disable_irqindex(VFIODevice *vbasedev, int index)
> +{
> +    struct vfio_irq_set irq_set = {
> +        .argsz = sizeof(irq_set),
> +        .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER,
> +        .index = index,
> +        .start = 0,
> +        .count = 0,
> +    };
> +
> +    ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
> +}
> +
> +void vfio_unmask_irqindex(VFIODevice *vbasedev, int index)
> +{
> +    struct vfio_irq_set irq_set = {
> +        .argsz = sizeof(irq_set),
> +        .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK,
> +        .index = index,
> +        .start = 0,
> +        .count = 1,
> +    };
> +
> +    ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
> +}
> +
> +void vfio_mask_irqindex(VFIODevice *vbasedev, int index)
> +{
> +    struct vfio_irq_set irq_set = {
> +        .argsz = sizeof(irq_set),
> +        .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_MASK,
> +        .index = index,
> +        .start = 0,
> +        .count = 1,
> +    };
> +
> +    ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
> +}
> +
> +/*
> + * IO Port/MMIO - Beware of the endians, VFIO is always little endian
> + */
> +void vfio_region_write(void *opaque, hwaddr addr,
> +                       uint64_t data, unsigned size)
> +{
> +    VFIORegion *region = opaque;
> +    VFIODevice *vbasedev = region->vbasedev;
> +    union {
> +        uint8_t byte;
> +        uint16_t word;
> +        uint32_t dword;
> +        uint64_t qword;
> +    } buf;
> +
> +    switch (size) {
> +    case 1:
> +        buf.byte = data;
> +        break;
> +    case 2:
> +        buf.word = data;
> +        break;
> +    case 4:
> +        buf.dword = data;

Please beware that this code is affected by Alexey's patch set that
fixes endianness for slow patch MMIO access and ROM regions.


Alex