[v6,28/42] nvme: verify validity of prp lists in the cmb

From: Klaus Jensen <k.jensen@samsung.com>

Before this patch the device already supported this, but it did not
check for the validity of it nor announced the support in the LISTS
field.

If some of the PRPs in a PRP list are in the CMB, then ALL entries must
be there. This patch makes sure that is verified as well as properly
announcing support for PRP lists in the CMB.

Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
---
 hw/block/nvme.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

On Mon, 2020-03-16 at 07:29 -0700, Klaus Jensen wrote:
> From: Klaus Jensen <k.jensen@samsung.com>
> 
> Before this patch the device already supported this, but it did not
> check for the validity of it nor announced the support in the LISTS
> field.
> 
> If some of the PRPs in a PRP list are in the CMB, then ALL entries must
> be there. This patch makes sure that is verified as well as properly
> announcing support for PRP lists in the CMB.
> 
> Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
> ---
>  hw/block/nvme.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/block/nvme.c b/hw/block/nvme.c
> index 850087aac967..eecfad694bf8 100644
> --- a/hw/block/nvme.c
> +++ b/hw/block/nvme.c
> @@ -210,6 +210,7 @@ static uint16_t nvme_map_prp(NvmeCtrl *n, QEMUSGList *qsg, QEMUIOVector *iov,
>      trans_len = MIN(len, trans_len);
>      int num_prps = (len >> n->page_bits) + 1;
>      uint16_t status;
> +    bool prp_list_in_cmb = false;
>  
>      trace_nvme_dev_map_prp(nvme_cid(req), trans_len, len, prp1, prp2,
>                             num_prps);
> @@ -237,11 +238,16 @@ static uint16_t nvme_map_prp(NvmeCtrl *n, QEMUSGList *qsg, QEMUIOVector *iov,
>              status = NVME_INVALID_FIELD | NVME_DNR;
>              goto unmap;
>          }
> +
>          if (len > n->page_size) {
>              uint64_t prp_list[n->max_prp_ents];
>              uint32_t nents, prp_trans;
>              int i = 0;
>  
> +            if (nvme_addr_is_cmb(n, prp2)) {
> +                prp_list_in_cmb = true;
> +            }
> +
>              nents = (len + n->page_size - 1) >> n->page_bits;
>              prp_trans = MIN(n->max_prp_ents, nents) * sizeof(uint64_t);
>              nvme_addr_read(n, prp2, (void *)prp_list, prp_trans);
> @@ -255,6 +261,11 @@ static uint16_t nvme_map_prp(NvmeCtrl *n, QEMUSGList *qsg, QEMUIOVector *iov,
>                          goto unmap;
>                      }
>  
> +                    if (prp_list_in_cmb != nvme_addr_is_cmb(n, prp_ent)) {
> +                        status = NVME_INVALID_USE_OF_CMB | NVME_DNR;
> +                        goto unmap;
> +                    }
> +
>                      i = 0;
>                      nents = (len + n->page_size - 1) >> n->page_bits;
>                      prp_trans = MIN(n->max_prp_ents, nents) * sizeof(uint64_t);
> @@ -274,6 +285,7 @@ static uint16_t nvme_map_prp(NvmeCtrl *n, QEMUSGList *qsg, QEMUIOVector *iov,
>                  if (status) {
>                      goto unmap;
>                  }
> +
>                  len -= trans_len;
>                  i++;
>              }
> @@ -1931,7 +1943,7 @@ static void nvme_init_cmb(NvmeCtrl *n, PCIDevice *pci_dev)
>  
>      NVME_CMBSZ_SET_SQS(n->bar.cmbsz, 1);
>      NVME_CMBSZ_SET_CQS(n->bar.cmbsz, 0);
> -    NVME_CMBSZ_SET_LISTS(n->bar.cmbsz, 0);
> +    NVME_CMBSZ_SET_LISTS(n->bar.cmbsz, 1);
>      NVME_CMBSZ_SET_RDS(n->bar.cmbsz, 1);
>      NVME_CMBSZ_SET_WDS(n->bar.cmbsz, 1);
>      NVME_CMBSZ_SET_SZU(n->bar.cmbsz, 2);

Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>

Best regards,
	Maxim Levitsky