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RE: [PATCH v4] virtio-pci: correctly set virtio pci queue mem multiplier
From: |
Srujana Challa |
Subject: |
RE: [PATCH v4] virtio-pci: correctly set virtio pci queue mem multiplier |
Date: |
Fri, 8 Mar 2024 13:08:32 +0000 |
Ping.
> -----Original Message-----
> From: Srujana Challa <schalla@marvell.com>
> Sent: Thursday, February 29, 2024 12:13 PM
> To: qemu-devel@nongnu.org
> Cc: mst@redhat.com; jasowang@redhat.com; Vamsi Krishna Attunuru
> <vattunuru@marvell.com>; Jerin Jacob <jerinj@marvell.com>; Srujana Challa
> <schalla@marvell.com>
> Subject: [PATCH v4] virtio-pci: correctly set virtio pci queue mem multiplier
>
> Currently, virtio_pci_queue_mem_mult function always returns 4K when
> VIRTIO_PCI_FLAG_PAGE_PER_VQ is set. But this won't work for vhost vdpa
> when host has page size other than 4K.
> This patch introduces a new property(page-per-vdpa-vq) for vdpa use case to
> fix the same.
>
> Signed-off-by: Srujana Challa <schalla@marvell.com>
> ---
> v3->v4:
> - Return failure if both page_per_vq and host_page_per_vq are set.
>
> v2->v3:
> - Modified property name, page-per-vdpa-vq to host-page-per-vq.
>
> v1->v2:
> - Introduced a new property to get virtqueue mem multiplier for
> vdpa use case.
>
> hw/virtio/virtio-pci.c | 18 ++++++++++++++++--
> include/hw/virtio/virtio-pci.h | 5 +++++
> 2 files changed, 21 insertions(+), 2 deletions(-)
>
> diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index
> 1a7039fb0c..4e31169c6f 100644
> --- a/hw/virtio/virtio-pci.c
> +++ b/hw/virtio/virtio-pci.c
> @@ -320,8 +320,12 @@ static bool virtio_pci_ioeventfd_enabled(DeviceState
> *d)
>
> static inline int virtio_pci_queue_mem_mult(struct VirtIOPCIProxy *proxy) {
> - return (proxy->flags & VIRTIO_PCI_FLAG_PAGE_PER_VQ) ?
> - QEMU_VIRTIO_PCI_QUEUE_MEM_MULT : 4;
> + if (proxy->flags & VIRTIO_PCI_FLAG_PAGE_PER_VQ)
> + return QEMU_VIRTIO_PCI_QUEUE_MEM_MULT;
> + else if (proxy->flags & VIRTIO_PCI_FLAG_HOST_PAGE_PER_VQ)
> + return qemu_real_host_page_size();
> + else
> + return 4;
> }
>
> static int virtio_pci_ioeventfd_assign(DeviceState *d, EventNotifier
> *notifier,
> @@ -2108,6 +2112,14 @@ static void virtio_pci_realize(PCIDevice *pci_dev,
> Error **errp)
> proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
> }
>
> + if ((proxy->flags & VIRTIO_PCI_FLAG_PAGE_PER_VQ) &&
> + (proxy->flags & VIRTIO_PCI_FLAG_HOST_PAGE_PER_VQ)) {
> + error_setg(errp, "device cannot work with both page-per-vq and"
> + " host-page-per-vq at the same time");
> + error_append_hint(errp, "Set either page-per-vq or host-page-per-
> vq\n");
> + return;
> + }
> +
> /*
> * virtio pci bar layout used by default.
> * subclasses can re-arrange things if needed.
> @@ -2301,6 +2313,8 @@ static Property virtio_pci_properties[] = {
> VIRTIO_PCI_FLAG_INIT_FLR_BIT, true),
> DEFINE_PROP_BIT("aer", VirtIOPCIProxy, flags,
> VIRTIO_PCI_FLAG_AER_BIT, false),
> + DEFINE_PROP_BIT("host-page-per-vq", VirtIOPCIProxy, flags,
> + VIRTIO_PCI_FLAG_HOST_PAGE_PER_VQ_BIT, false),
> DEFINE_PROP_END_OF_LIST(),
> };
>
> diff --git a/include/hw/virtio/virtio-pci.h b/include/hw/virtio/virtio-pci.h
> index
> 59d88018c1..81b6de4291 100644
> --- a/include/hw/virtio/virtio-pci.h
> +++ b/include/hw/virtio/virtio-pci.h
> @@ -43,6 +43,7 @@ enum {
> VIRTIO_PCI_FLAG_INIT_FLR_BIT,
> VIRTIO_PCI_FLAG_AER_BIT,
> VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT,
> + VIRTIO_PCI_FLAG_HOST_PAGE_PER_VQ_BIT,
> };
>
> /* Need to activate work-arounds for buggy guests at vmstate load. */ @@ -
> 89,6 +90,10 @@ enum { #define VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED \
> (1 << VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT)
>
> +/* page per vdpa vq flag to be used for vhost vdpa backends */ #define
> +VIRTIO_PCI_FLAG_HOST_PAGE_PER_VQ \
> + (1 << VIRTIO_PCI_FLAG_HOST_PAGE_PER_VQ_BIT)
> +
> typedef struct {
> MSIMessage msg;
> int virq;
> --
> 2.25.1
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