From: Mike Pattrick <mkp@redhat.com>
To: Maxime Coquelin <maxime.coquelin@redhat.com>
Cc: dev@dpdk.org, david.marchand@redhat.com, chenbo.xia@intel.com,
fbl@redhat.com, jasowang@redhat.com, cunming.liang@intel.com,
xieyongji@bytedance.com, echaudro@redhat.com,
eperezma@redhat.com, amorenoz@redhat.com
Subject: Re: [RFC 05/27] vhost: add helper for IOTLB entries shared page check
Date: Wed, 19 Apr 2023 10:52:11 -0400 [thread overview]
Message-ID: <CAHcdBH4NrytZFe6E8hKcE5QiXM8spkgXc7QUt+3JReyReVgnVg@mail.gmail.com> (raw)
In-Reply-To: <e9e640a1-83f5-3b12-aea1-d7ff59ee3eb6@redhat.com>
On Wed, Apr 19, 2023 at 5:35 AM Maxime Coquelin
<maxime.coquelin@redhat.com> wrote:
>
> Hi Mike,
>
> On 4/17/23 21:39, Mike Pattrick wrote:
> > Hi Maxime,
> >
> > On Fri, Mar 31, 2023 at 11:43 AM Maxime Coquelin
> > <maxime.coquelin@redhat.com> wrote:
> >>
> >> This patch introduces a helper to check whether two IOTLB
> >> entries share a page.
> >>
> >> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> >> ---
> >> lib/vhost/iotlb.c | 25 ++++++++++++++++++++-----
> >> 1 file changed, 20 insertions(+), 5 deletions(-)
> >>
> >> diff --git a/lib/vhost/iotlb.c b/lib/vhost/iotlb.c
> >> index e8f1cb661e..d919f74704 100644
> >> --- a/lib/vhost/iotlb.c
> >> +++ b/lib/vhost/iotlb.c
> >> @@ -23,6 +23,23 @@ struct vhost_iotlb_entry {
> >>
> >> #define IOTLB_CACHE_SIZE 2048
> >>
> >> +static bool
> >> +vhost_user_iotlb_share_page(struct vhost_iotlb_entry *a, struct vhost_iotlb_entry *b,
> >> + uint64_t align)
> >> +{
> >> + uint64_t a_end, b_start;
> >> +
> >> + if (a == NULL || b == NULL)
> >> + return false;
> >> +
> >> + /* Assumes entry a lower than entry b */
> >> + RTE_ASSERT(a->uaddr < b->uaddr);
> >> + a_end = RTE_ALIGN_CEIL(a->uaddr + a->size, align);
> >> + b_start = RTE_ALIGN_FLOOR(b->uaddr, align);
> >> +
> >> + return a_end > b_start;
> >
> > This may be a very minor detail, but it might improve readability if
> > the a_end calculation used addr + size - 1 and the return conditional
> > used >=.
>
> That's actually how I initially implemented it, but discussing with
> David we agreed it would be better that way for consistency with
> vhost_user_iotlb_clear_dump().
I can get behind consistency.
Acked-by: Mike Pattrick <mkp@redhat.com>
>
> Regards,
> Maxime
>
> >
> > Cheers,
> > M
> >
> >
> >> +}
> >> +
> >> static void
> >> vhost_user_iotlb_set_dump(struct virtio_net *dev, struct vhost_iotlb_entry *node)
> >> {
> >> @@ -37,16 +54,14 @@ static void
> >> vhost_user_iotlb_clear_dump(struct virtio_net *dev, struct vhost_iotlb_entry *node,
> >> struct vhost_iotlb_entry *prev, struct vhost_iotlb_entry *next)
> >> {
> >> - uint64_t align, mask;
> >> + uint64_t align;
> >>
> >> align = hua_to_alignment(dev->mem, (void *)(uintptr_t)node->uaddr);
> >> - mask = ~(align - 1);
> >>
> >> /* Don't disable coredump if the previous node is in the same page */
> >> - if (prev == NULL || (node->uaddr & mask) != ((prev->uaddr + prev->size - 1) & mask)) {
> >> + if (!vhost_user_iotlb_share_page(prev, node, align)) {
> >> /* Don't disable coredump if the next node is in the same page */
> >> - if (next == NULL ||
> >> - ((node->uaddr + node->size - 1) & mask) != (next->uaddr & mask))
> >> + if (!vhost_user_iotlb_share_page(node, next, align))
> >> mem_set_dump((void *)(uintptr_t)node->uaddr, node->size, false, align);
> >> }
> >> }
> >> --
> >> 2.39.2
> >>
> >
>
next prev parent reply other threads:[~2023-04-19 14:52 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-31 15:42 [RFC 00/27] Add VDUSE support to Vhost library Maxime Coquelin
2023-03-31 15:42 ` [RFC 01/27] vhost: fix missing guest notif stat increment Maxime Coquelin
2023-04-24 2:57 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 02/27] vhost: fix invalid call FD handling Maxime Coquelin
2023-04-24 2:58 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 03/27] vhost: fix IOTLB entries overlap check with previous entry Maxime Coquelin
2023-04-17 19:15 ` Mike Pattrick
2023-04-24 2:58 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 04/27] vhost: add helper of IOTLB entries coredump Maxime Coquelin
2023-04-24 2:59 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 05/27] vhost: add helper for IOTLB entries shared page check Maxime Coquelin
2023-04-17 19:39 ` Mike Pattrick
2023-04-19 9:35 ` Maxime Coquelin
2023-04-19 14:52 ` Mike Pattrick [this message]
2023-04-24 2:59 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 06/27] vhost: don't dump unneeded pages with IOTLB Maxime Coquelin
2023-04-20 17:11 ` Mike Pattrick
2023-04-24 3:00 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 07/27] vhost: change to single IOTLB cache per device Maxime Coquelin
2023-04-25 6:19 ` Xia, Chenbo
2023-05-03 13:47 ` Maxime Coquelin
2023-03-31 15:42 ` [RFC 08/27] vhost: add offset field to IOTLB entries Maxime Coquelin
2023-04-25 6:20 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 09/27] vhost: add page size info to IOTLB entry Maxime Coquelin
2023-04-25 6:20 ` Xia, Chenbo
2023-05-03 13:57 ` Maxime Coquelin
2023-03-31 15:42 ` [RFC 10/27] vhost: retry translating IOVA after IOTLB miss Maxime Coquelin
2023-05-05 5:07 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 11/27] vhost: introduce backend ops Maxime Coquelin
2023-05-05 5:07 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 12/27] vhost: add IOTLB cache entry removal callback Maxime Coquelin
2023-05-05 5:07 ` Xia, Chenbo
2023-05-25 11:20 ` Maxime Coquelin
2023-03-31 15:42 ` [RFC 13/27] vhost: add helper for IOTLB misses Maxime Coquelin
2023-03-31 15:42 ` [RFC 14/27] vhost: add helper for interrupt injection Maxime Coquelin
2023-05-05 5:07 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 15/27] vhost: add API to set max queue pairs Maxime Coquelin
2023-05-05 5:07 ` Xia, Chenbo
2023-05-25 11:23 ` Maxime Coquelin
2023-03-31 15:42 ` [RFC 16/27] net/vhost: use " Maxime Coquelin
2023-05-05 5:07 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 17/27] vhost: add control virtqueue support Maxime Coquelin
2023-05-09 5:29 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 18/27] vhost: add VDUSE device creation and destruction Maxime Coquelin
2023-05-09 5:31 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 19/27] vhost: add VDUSE callback for IOTLB miss Maxime Coquelin
2023-05-09 5:31 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 20/27] vhost: add VDUSE callback for IOTLB entry removal Maxime Coquelin
2023-05-09 5:32 ` Xia, Chenbo
2023-05-25 11:35 ` Maxime Coquelin
2023-03-31 15:42 ` [RFC 21/27] vhost: add VDUSE callback for IRQ injection Maxime Coquelin
2023-05-09 5:33 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 22/27] vhost: add VDUSE events handler Maxime Coquelin
2023-05-09 5:34 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 23/27] vhost: add support for virtqueue state get event Maxime Coquelin
2023-05-09 5:34 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 24/27] vhost: add support for VDUSE status set event Maxime Coquelin
2023-05-09 5:34 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 25/27] vhost: add support for VDUSE IOTLB update event Maxime Coquelin
2023-05-09 5:35 ` Xia, Chenbo
2023-05-25 11:43 ` Maxime Coquelin
2023-03-31 15:42 ` [RFC 26/27] vhost: add VDUSE device startup Maxime Coquelin
2023-05-09 5:35 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 27/27] vhost: add multiqueue support to VDUSE Maxime Coquelin
2023-05-09 5:35 ` Xia, Chenbo
2023-04-06 3:44 ` [RFC 00/27] Add VDUSE support to Vhost library Yongji Xie
2023-04-06 8:16 ` Maxime Coquelin
2023-04-06 11:04 ` Yongji Xie
2023-04-12 11:33 ` Ferruh Yigit
2023-04-12 15:28 ` Maxime Coquelin
2023-04-12 19:40 ` Morten Brørup
2023-04-13 7:08 ` Xia, Chenbo
2023-04-13 7:58 ` Morten Brørup
2023-04-13 7:59 ` Maxime Coquelin
2023-04-14 10:48 ` Ferruh Yigit
2023-04-14 12:06 ` Maxime Coquelin
2023-04-14 14:25 ` Ferruh Yigit
2023-04-17 3:10 ` Jason Wang
2023-05-05 5:53 ` Xia, Chenbo
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