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Re: [PATCH 16/16] hw/block/nvme: use preallocated qsg/iov in nvme_dma_pr
From: |
Klaus Jensen |
Subject: |
Re: [PATCH 16/16] hw/block/nvme: use preallocated qsg/iov in nvme_dma_prp |
Date: |
Wed, 29 Jul 2020 21:57:30 +0200 |
On Jul 30 01:15, Minwoo Im wrote:
> On 20-07-20 13:37:48, Klaus Jensen wrote:
> > From: Klaus Jensen <k.jensen@samsung.com>
> >
> > Since clean up of the request qsg/iov is now always done post-use, there
> > is no need to use a stack-allocated qsg/iov in nvme_dma_prp.
> >
> > Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
> > Acked-by: Keith Busch <kbusch@kernel.org>
> > Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
>
> > ---
> > hw/block/nvme.c | 18 ++++++------------
> > 1 file changed, 6 insertions(+), 12 deletions(-)
> >
> > diff --git a/hw/block/nvme.c b/hw/block/nvme.c
> > index 0b3dceccc89b..b6da5a9f3fc6 100644
> > --- a/hw/block/nvme.c
> > +++ b/hw/block/nvme.c
> > @@ -381,45 +381,39 @@ static uint16_t nvme_dma_prp(NvmeCtrl *n, uint8_t
> > *ptr, uint32_t len,
> > uint64_t prp1, uint64_t prp2, DMADirection
> > dir,
> > NvmeRequest *req)
> > {
> > - QEMUSGList qsg;
> > - QEMUIOVector iov;
> > uint16_t status = NVME_SUCCESS;
> >
> > - status = nvme_map_prp(n, &qsg, &iov, prp1, prp2, len, req);
> > + status = nvme_map_prp(n, &req->qsg, &req->iov, prp1, prp2, len, req);
>
> After this change, can we make nvme_map_prp() just receive
> NvmeRequest *req without &req->qsg, &req->iov by retrieve them from
> inside of the nvme_map_prp()?
Absolutely. I added a follow up patch to do this :)
- [PATCH 12/16] hw/block/nvme: refactor NvmeRequest clearing, (continued)
- [PATCH 12/16] hw/block/nvme: refactor NvmeRequest clearing, Klaus Jensen, 2020/07/20
- [PATCH 14/16] hw/block/nvme: consolidate qsg/iov clearing, Klaus Jensen, 2020/07/20
- [PATCH 16/16] hw/block/nvme: use preallocated qsg/iov in nvme_dma_prp, Klaus Jensen, 2020/07/20
- [PATCH 13/16] hw/block/nvme: add a namespace reference in NvmeRequest, Klaus Jensen, 2020/07/20
- [PATCH 11/16] hw/block/nvme: be consistent about zeros vs zeroes, Klaus Jensen, 2020/07/20
- [PATCH 15/16] hw/block/nvme: remove NvmeCmd parameter, Klaus Jensen, 2020/07/20