From: Claudio Imbrenda <imbrenda@linux.ibm.com>
To: Pierre Morel <pmorel@linux.ibm.com>
Cc: Matthew Rosato <mjrosato@linux.ibm.com>,
linux-s390@vger.kernel.org, alex.williamson@redhat.com,
cohuck@redhat.com, schnelle@linux.ibm.com, farman@linux.ibm.com,
borntraeger@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com,
gerald.schaefer@linux.ibm.com, agordeev@linux.ibm.com,
frankja@linux.ibm.com, david@redhat.com, vneethv@linux.ibm.com,
oberpar@linux.ibm.com, freude@linux.ibm.com, thuth@redhat.com,
pasic@linux.ibm.com, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 12/30] s390/pci: get SHM information from list pci
Date: Wed, 26 Jan 2022 11:13:00 +0100 [thread overview]
Message-ID: <20220126111300.1084623e@p-imbrenda> (raw)
In-Reply-To: <a0fbd50c-bfa4-5f62-6dea-18b85562fff6@linux.ibm.com>
On Tue, 18 Jan 2022 11:36:06 +0100
Pierre Morel <pmorel@linux.ibm.com> wrote:
> On 1/14/22 21:31, Matthew Rosato wrote:
> > KVM will need information on the special handle mask used to indicate
> > emulated devices. In order to obtain this, a new type of list pci call
> > must be made to gather the information. Extend clp_list_pci_req to
> > also fetch the model-dependent-data field that holds this mask.
> >
> > Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
> > ---
> > arch/s390/include/asm/pci.h | 1 +
> > arch/s390/include/asm/pci_clp.h | 2 +-
> > arch/s390/pci/pci_clp.c | 28 +++++++++++++++++++++++++---
> > 3 files changed, 27 insertions(+), 4 deletions(-)
> >
> > diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h
> > index 00a2c24d6d2b..f3cd2da8128c 100644
> > --- a/arch/s390/include/asm/pci.h
> > +++ b/arch/s390/include/asm/pci.h
> > @@ -227,6 +227,7 @@ int clp_enable_fh(struct zpci_dev *zdev, u32 *fh, u8 nr_dma_as);
> > int clp_disable_fh(struct zpci_dev *zdev, u32 *fh);
> > int clp_get_state(u32 fid, enum zpci_state *state);
> > int clp_refresh_fh(u32 fid, u32 *fh);
> > +int zpci_get_mdd(u32 *mdd);
> >
> > /* UID */
> > void update_uid_checking(bool new);
> > diff --git a/arch/s390/include/asm/pci_clp.h b/arch/s390/include/asm/pci_clp.h
> > index 124fadfb74b9..d6bc324763f3 100644
> > --- a/arch/s390/include/asm/pci_clp.h
> > +++ b/arch/s390/include/asm/pci_clp.h
> > @@ -76,7 +76,7 @@ struct clp_req_list_pci {
> > struct clp_rsp_list_pci {
> > struct clp_rsp_hdr hdr;
> > u64 resume_token;
> > - u32 reserved2;
> > + u32 mdd;
> > u16 max_fn;
> > u8 : 7;
> > u8 uid_checking : 1;
> > diff --git a/arch/s390/pci/pci_clp.c b/arch/s390/pci/pci_clp.c
> > index bc7446566cbc..308ffb93413f 100644
> > --- a/arch/s390/pci/pci_clp.c
> > +++ b/arch/s390/pci/pci_clp.c
> > @@ -328,7 +328,7 @@ int clp_disable_fh(struct zpci_dev *zdev, u32 *fh)
> > }
> >
> > static int clp_list_pci_req(struct clp_req_rsp_list_pci *rrb,
> > - u64 *resume_token, int *nentries)
> > + u64 *resume_token, int *nentries, u32 *mdd)
> > {
> > int rc;
> >
> > @@ -354,6 +354,8 @@ static int clp_list_pci_req(struct clp_req_rsp_list_pci *rrb,
> > *nentries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
> > rrb->response.entry_size;
> > *resume_token = rrb->response.resume_token;
> > + if (mdd)
> > + *mdd = rrb->response.mdd;
> >
> > return rc;
> > }
> > @@ -365,7 +367,7 @@ static int clp_list_pci(struct clp_req_rsp_list_pci *rrb, void *data,
> > int nentries, i, rc;
> >
> > do {
> > - rc = clp_list_pci_req(rrb, &resume_token, &nentries);
> > + rc = clp_list_pci_req(rrb, &resume_token, &nentries, NULL);
> > if (rc)
> > return rc;
> > for (i = 0; i < nentries; i++)
> > @@ -383,7 +385,7 @@ static int clp_find_pci(struct clp_req_rsp_list_pci *rrb, u32 fid,
> > int nentries, i, rc;
> >
> > do {
> > - rc = clp_list_pci_req(rrb, &resume_token, &nentries);
> > + rc = clp_list_pci_req(rrb, &resume_token, &nentries, NULL);
> > if (rc)
> > return rc;
> > fh_list = rrb->response.fh_list;
> > @@ -468,6 +470,26 @@ int clp_get_state(u32 fid, enum zpci_state *state)
> > return rc;
> > }
> >
> > +int zpci_get_mdd(u32 *mdd)
> > +{
> > + struct clp_req_rsp_list_pci *rrb;
> > + u64 resume_token = 0;
> > + int nentries, rc;
> > +
> > + if (!mdd)
> > + return -EINVAL;
>
> I think this tests is not useful.
> The caller must take care not to call with a NULL pointer,
> what the only caller today make sure.
what if the caller does it anyway?
I think the test is useful. if passing NULL is a bug, then maybe
consider using BUG_ON, or WARN_ONCE
>
>
> > +
> > + rrb = clp_alloc_block(GFP_KERNEL);
> > + if (!rrb)
> > + return -ENOMEM;
> > +
> > + rc = clp_list_pci_req(rrb, &resume_token, &nentries, mdd);
> > +
> > + clp_free_block(rrb);
> > + return rc;
> > +}
> > +EXPORT_SYMBOL_GPL(zpci_get_mdd);
> > +
> > static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
> > {
> > unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
> >
>
next prev parent reply other threads:[~2022-01-26 10:13 UTC|newest]
Thread overview: 97+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-14 20:31 [PATCH v2 00/30] KVM: s390: enable zPCI for interpretive execution Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 01/30] s390/sclp: detect the zPCI load/store interpretation facility Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 02/30] s390/sclp: detect the AISII facility Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 03/30] s390/sclp: detect the AENI facility Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 04/30] s390/sclp: detect the AISI facility Matthew Rosato
2022-01-17 7:57 ` Thomas Huth
2022-01-14 20:31 ` [PATCH v2 05/30] s390/airq: pass more TPI info to airq handlers Matthew Rosato
2022-01-17 8:27 ` Thomas Huth
2022-01-14 20:31 ` [PATCH v2 06/30] s390/airq: allow for airq structure that uses an input vector Matthew Rosato
2022-01-17 12:29 ` Claudio Imbrenda
2022-01-18 18:52 ` Matthew Rosato
2022-01-18 9:50 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 07/30] s390/pci: externalize the SIC operation controls and routine Matthew Rosato
2022-01-17 16:19 ` Niklas Schnelle
2022-01-26 10:07 ` Claudio Imbrenda
2022-01-27 9:57 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 08/30] s390/pci: stash associated GISA designation Matthew Rosato
2022-01-24 14:08 ` Pierre Morel
2022-01-24 15:12 ` Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 09/30] s390/pci: export some routines related to RPCIT processing Matthew Rosato
2022-01-18 9:51 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 10/30] s390/pci: stash dtsm and maxstbl Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 11/30] s390/pci: add helper function to find device by handle Matthew Rosato
2022-01-18 9:53 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 12/30] s390/pci: get SHM information from list pci Matthew Rosato
2022-01-18 10:36 ` Pierre Morel
2022-01-26 10:13 ` Claudio Imbrenda [this message]
2022-01-27 13:41 ` Pierre Morel
2022-01-27 15:14 ` Matthew Rosato
2022-01-27 10:29 ` Niklas Schnelle
2022-01-14 20:31 ` [PATCH v2 13/30] s390/pci: return status from zpci_refresh_trans Matthew Rosato
2022-01-19 18:13 ` Pierre Morel
2022-01-26 10:45 ` Claudio Imbrenda
2022-01-27 10:30 ` Niklas Schnelle
2022-01-14 20:31 ` [PATCH v2 14/30] KVM: s390: pci: add basic kvm_zdev structure Matthew Rosato
2022-01-17 16:25 ` Pierre Morel
2022-01-18 17:32 ` Pierre Morel
2022-01-18 18:39 ` Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 15/30] KVM: s390: pci: do initial setup for AEN interpretation Matthew Rosato
2022-01-19 18:06 ` Pierre Morel
2022-01-19 20:19 ` Matthew Rosato
2022-01-25 12:23 ` Pierre Morel
2022-01-25 14:57 ` Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 16/30] KVM: s390: pci: enable host forwarding of Adapter Event Notifications Matthew Rosato
2022-01-17 17:38 ` Pierre Morel
2022-01-18 17:25 ` Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 17/30] KVM: s390: mechanism to enable guest zPCI Interpretation Matthew Rosato
2022-01-24 14:24 ` Pierre Morel
2022-01-24 15:28 ` Matthew Rosato
2022-01-24 17:15 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 18/30] KVM: s390: pci: provide routines for enabling/disabling interpretation Matthew Rosato
2022-01-24 14:36 ` Pierre Morel
2022-01-24 15:14 ` Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 19/30] KVM: s390: pci: provide routines for enabling/disabling interrupt forwarding Matthew Rosato
2022-01-25 12:41 ` Pierre Morel
2022-01-25 15:44 ` Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 20/30] KVM: s390: pci: provide routines for enabling/disabling IOAT assist Matthew Rosato
2022-01-25 13:29 ` Pierre Morel
2022-01-25 14:47 ` Matthew Rosato
2022-01-26 8:30 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 21/30] KVM: s390: pci: handle refresh of PCI translations Matthew Rosato
2022-01-19 9:29 ` Pierre Morel
2022-01-19 16:39 ` Matthew Rosato
2022-01-19 18:25 ` Pierre Morel
2022-01-19 20:02 ` Matthew Rosato
2022-01-20 9:47 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 22/30] KVM: s390: intercept the rpcit instruction Matthew Rosato
2022-01-18 11:05 ` Pierre Morel
2022-01-18 17:27 ` Matthew Rosato
2022-01-18 17:54 ` Pierre Morel
2022-01-19 14:06 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 23/30] vfio/pci: re-introduce CONFIG_VFIO_PCI_ZDEV Matthew Rosato
2022-01-18 17:20 ` Pierre Morel
2022-01-18 17:32 ` Matthew Rosato
2022-01-18 17:45 ` Pierre Morel
2022-01-18 18:05 ` Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 24/30] vfio-pci/zdev: wire up group notifier Matthew Rosato
2022-01-18 17:34 ` Pierre Morel
2022-01-18 18:37 ` Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 25/30] vfio-pci/zdev: wire up zPCI interpretive execution support Matthew Rosato
2022-01-25 13:01 ` Pierre Morel
2022-01-25 14:21 ` Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 26/30] vfio-pci/zdev: wire up zPCI adapter interrupt forwarding support Matthew Rosato
2022-01-19 17:10 ` Pierre Morel
2022-01-19 17:20 ` Matthew Rosato
2022-01-25 12:36 ` Pierre Morel
2022-01-25 14:16 ` Matthew Rosato
2022-01-26 8:24 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 27/30] vfio-pci/zdev: wire up zPCI IOAT assist support Matthew Rosato
2022-01-19 14:03 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 28/30] vfio-pci/zdev: add DTSM to clp group capability Matthew Rosato
2022-01-19 13:48 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 29/30] KVM: s390: introduce CPU feature for zPCI Interpretation Matthew Rosato
2022-01-19 13:39 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 30/30] MAINTAINERS: additional files related kvm s390 pci passthrough Matthew Rosato
2022-01-14 20:49 ` [PATCH v2 00/30] KVM: s390: enable zPCI for interpretive execution Matthew Rosato
2022-01-19 18:10 ` Pierre Morel
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