From: Pierre Morel <pmorel@linux.ibm.com>
To: Matthew Rosato <mjrosato@linux.ibm.com>, linux-s390@vger.kernel.org
Cc: 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, imbrenda@linux.ibm.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 22/32] KVM: s390: pci: provide routines for enabling/disabling IOAT assist
Date: Tue, 14 Dec 2021 18:46:49 +0100 [thread overview]
Message-ID: <c1f1ca6b-916d-418a-5bc3-8debe53bfa5e@linux.ibm.com> (raw)
In-Reply-To: <20211207205743.150299-23-mjrosato@linux.ibm.com>
On 12/7/21 21:57, Matthew Rosato wrote:
> These routines will be wired into the vfio_pci_zdev ioctl handlers to
> respond to requests to enable / disable a device for PCI I/O Address
> Translation assistance.
>
> Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
> ---
> arch/s390/include/asm/kvm_pci.h | 15 ++++
> arch/s390/include/asm/pci_dma.h | 2 +
> arch/s390/kvm/pci.c | 133 ++++++++++++++++++++++++++++++++
> arch/s390/kvm/pci.h | 2 +
> 4 files changed, 152 insertions(+)
>
> diff --git a/arch/s390/include/asm/kvm_pci.h b/arch/s390/include/asm/kvm_pci.h
> index 54a0afdbe7d0..254275399f21 100644
> --- a/arch/s390/include/asm/kvm_pci.h
> +++ b/arch/s390/include/asm/kvm_pci.h
> @@ -16,11 +16,21 @@
> #include <linux/kvm_host.h>
> #include <linux/kvm.h>
> #include <linux/pci.h>
> +#include <linux/mutex.h>
> #include <asm/pci_insn.h>
> +#include <asm/pci_dma.h>
> +
> +struct kvm_zdev_ioat {
> + unsigned long *head[ZPCI_TABLE_PAGES];
> + unsigned long **seg;
> + unsigned long ***pt;
> + struct mutex lock;
> +};
>
> struct kvm_zdev {
> struct zpci_dev *zdev;
> struct kvm *kvm;
> + struct kvm_zdev_ioat ioat;
> struct zpci_fib fib;
> };
>
> @@ -33,6 +43,11 @@ extern int kvm_s390_pci_aif_enable(struct zpci_dev *zdev, struct zpci_fib *fib,
> bool assist);
> extern int kvm_s390_pci_aif_disable(struct zpci_dev *zdev);
>
> +extern int kvm_s390_pci_ioat_probe(struct zpci_dev *zdev);
> +extern int kvm_s390_pci_ioat_enable(struct zpci_dev *zdev, u64 iota);
> +extern int kvm_s390_pci_ioat_disable(struct zpci_dev *zdev);
> +extern u8 kvm_s390_pci_get_dtsm(struct zpci_dev *zdev);
> +
> extern int kvm_s390_pci_interp_probe(struct zpci_dev *zdev);
> extern int kvm_s390_pci_interp_enable(struct zpci_dev *zdev);
> extern int kvm_s390_pci_interp_disable(struct zpci_dev *zdev);
> diff --git a/arch/s390/include/asm/pci_dma.h b/arch/s390/include/asm/pci_dma.h
> index 3b8e89d4578a..e1d3c1d3fc8a 100644
> --- a/arch/s390/include/asm/pci_dma.h
> +++ b/arch/s390/include/asm/pci_dma.h
> @@ -50,6 +50,8 @@ enum zpci_ioat_dtype {
> #define ZPCI_TABLE_ALIGN ZPCI_TABLE_SIZE
> #define ZPCI_TABLE_ENTRY_SIZE (sizeof(unsigned long))
> #define ZPCI_TABLE_ENTRIES (ZPCI_TABLE_SIZE / ZPCI_TABLE_ENTRY_SIZE)
> +#define ZPCI_TABLE_PAGES (ZPCI_TABLE_SIZE >> PAGE_SHIFT)
> +#define ZPCI_TABLE_ENTRIES_PAGES (ZPCI_TABLE_ENTRIES * ZPCI_TABLE_PAGES)
>
> #define ZPCI_TABLE_BITS 11
> #define ZPCI_PT_BITS 8
> diff --git a/arch/s390/kvm/pci.c b/arch/s390/kvm/pci.c
> index 3a29398dd53b..a1c0c0881332 100644
> --- a/arch/s390/kvm/pci.c
> +++ b/arch/s390/kvm/pci.c
> @@ -12,6 +12,7 @@
> #include <asm/kvm_pci.h>
> #include <asm/pci.h>
> #include <asm/pci_insn.h>
> +#include <asm/pci_dma.h>
> #include <asm/sclp.h>
> #include "pci.h"
> #include "kvm-s390.h"
> @@ -315,6 +316,131 @@ int kvm_s390_pci_aif_disable(struct zpci_dev *zdev)
> }
> EXPORT_SYMBOL_GPL(kvm_s390_pci_aif_disable);
>
> +int kvm_s390_pci_ioat_probe(struct zpci_dev *zdev)
> +{
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(kvm_s390_pci_ioat_probe);
> +
> +int kvm_s390_pci_ioat_enable(struct zpci_dev *zdev, u64 iota)
> +{
> + gpa_t gpa = (gpa_t)(iota & ZPCI_RTE_ADDR_MASK);
> + struct kvm_zdev_ioat *ioat;
> + struct page *page;
> + struct kvm *kvm;
> + unsigned int idx;
> + void *iaddr;
> + int i, rc = 0;
> +
> + if (!zdev->kzdev || !zdev->kzdev->kvm || zdev->kzdev->ioat.head[0])
> + return -EINVAL;
The only caller already checked zdev->kzdev.
Could we use a macro to replace zdev->kzdev->ioat.head[0] ?
like
#define shadow_pgtbl_initialized zdev->kzdev->ioat.head[0]
Would be clearer for me.
> +
> + /* Ensure supported type specified */
> + if ((iota & ZPCI_IOTA_RTTO_FLAG) != ZPCI_IOTA_RTTO_FLAG)
> + return -EINVAL;
> +
> + kvm = zdev->kzdev->kvm;
> + ioat = &zdev->kzdev->ioat;
> + mutex_lock(&ioat->lock);
> + idx = srcu_read_lock(&kvm->srcu);
> + for (i = 0; i < ZPCI_TABLE_PAGES; i++) {
> + page = gfn_to_page(kvm, gpa_to_gfn(gpa));
> + if (is_error_page(page)) {
> + srcu_read_unlock(&kvm->srcu, idx);
> + rc = -EIO;
> + goto out;
> + }
> + iaddr = page_to_virt(page) + (gpa & ~PAGE_MASK);
> + ioat->head[i] = (unsigned long *)iaddr;
> + gpa += PAGE_SIZE;
> + }
> + srcu_read_unlock(&kvm->srcu, idx);
> +
> + zdev->kzdev->ioat.seg = kcalloc(ZPCI_TABLE_ENTRIES_PAGES,
> + sizeof(unsigned long *), GFP_KERNEL);
> + if (!zdev->kzdev->ioat.seg)
> + goto unpin;
> + zdev->kzdev->ioat.pt = kcalloc(ZPCI_TABLE_ENTRIES,
> + sizeof(unsigned long **), GFP_KERNEL);
> + if (!zdev->kzdev->ioat.pt)
> + goto free_seg;
> +
> +out:
> + mutex_unlock(&ioat->lock);
> + return rc;
> +
> +free_seg:
> + kfree(zdev->kzdev->ioat.seg);
> +unpin:
> + for (i = 0; i < ZPCI_TABLE_PAGES; i++) {
> + kvm_release_pfn_dirty((u64)ioat->head[i] >> PAGE_SHIFT);
I did not find when the pages are pinned.
> + ioat->head[i] = 0;
> + }
> + mutex_unlock(&ioat->lock);
> + return -ENOMEM;
> +}
> +EXPORT_SYMBOL_GPL(kvm_s390_pci_ioat_enable);
> +
...snip...
>
--
Pierre Morel
IBM Lab Boeblingen
next prev parent reply other threads:[~2021-12-14 17:45 UTC|newest]
Thread overview: 119+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-07 20:57 [PATCH 00/32] KVM: s390: enable zPCI for interpretive execution Matthew Rosato
2021-12-07 20:57 ` [PATCH 01/32] s390/sclp: detect the zPCI interpretation facility Matthew Rosato
2021-12-08 11:12 ` Christian Borntraeger
2021-12-08 14:33 ` Eric Farman
2021-12-08 13:06 ` Claudio Imbrenda
2021-12-07 20:57 ` [PATCH 02/32] s390/sclp: detect the AISII facility Matthew Rosato
2021-12-08 11:13 ` Christian Borntraeger
2021-12-08 13:07 ` Claudio Imbrenda
2021-12-07 20:57 ` [PATCH 03/32] s390/sclp: detect the AENI facility Matthew Rosato
2021-12-08 11:17 ` Christian Borntraeger
2021-12-08 13:08 ` Claudio Imbrenda
2021-12-07 20:57 ` [PATCH 04/32] s390/sclp: detect the AISI facility Matthew Rosato
2021-12-08 11:18 ` Christian Borntraeger
2021-12-08 13:09 ` Claudio Imbrenda
2021-12-07 20:57 ` [PATCH 05/32] s390/airq: pass more TPI info to airq handlers Matthew Rosato
2021-12-08 11:25 ` Christian Borntraeger
2021-12-08 13:14 ` Claudio Imbrenda
2021-12-13 14:35 ` Pierre Morel
2021-12-07 20:57 ` [PATCH 06/32] s390/airq: allow for airq structure that uses an input vector Matthew Rosato
2021-12-08 10:04 ` Thomas Huth
2021-12-08 12:59 ` Christian Borntraeger
2021-12-07 20:57 ` [PATCH 07/32] s390/pci: externalize the SIC operation controls and routine Matthew Rosato
2021-12-08 13:09 ` Christian Borntraeger
2021-12-08 13:53 ` Niklas Schnelle
2021-12-08 15:33 ` Matthew Rosato
2021-12-08 15:59 ` Niklas Schnelle
2021-12-08 16:20 ` Matthew Rosato
2021-12-08 16:41 ` Niklas Schnelle
2021-12-08 18:18 ` Niklas Schnelle
2021-12-07 20:57 ` [PATCH 08/32] s390/pci: stash associated GISA designation Matthew Rosato
2021-12-09 15:07 ` Christian Borntraeger
2021-12-10 19:01 ` Eric Farman
2021-12-13 14:59 ` Pierre Morel
2021-12-07 20:57 ` [PATCH 09/32] s390/pci: export some routines related to RPCIT processing Matthew Rosato
2021-12-09 15:20 ` Christian Borntraeger
2021-12-07 20:57 ` [PATCH 10/32] s390/pci: stash dtsm and maxstbl Matthew Rosato
2021-12-08 16:18 ` Niklas Schnelle
2021-12-09 9:13 ` Pierre Morel
2021-12-09 15:25 ` Christian Borntraeger
2021-12-07 20:57 ` [PATCH 11/32] s390/pci: add helper function to find device by handle Matthew Rosato
2021-12-09 15:28 ` Christian Borntraeger
2021-12-10 19:04 ` Eric Farman
2021-12-07 20:57 ` [PATCH 12/32] s390/pci: get SHM information from list pci Matthew Rosato
2021-12-08 12:21 ` Niklas Schnelle
2021-12-09 18:25 ` Matthew Rosato
2021-12-09 15:47 ` Christian Borntraeger
2021-12-10 8:45 ` Niklas Schnelle
2021-12-07 20:57 ` [PATCH 13/32] KVM: s390: pci: add basic kvm_zdev structure Matthew Rosato
2021-12-09 15:54 ` Christian Borntraeger
2021-12-10 19:04 ` Eric Farman
2021-12-13 15:19 ` Pierre Morel
2021-12-14 9:15 ` Pierre Morel
2021-12-17 20:26 ` Matthew Rosato
2021-12-20 17:26 ` Pierre Morel
2021-12-07 20:57 ` [PATCH 14/32] KVM: s390: pci: do initial setup for AEN interpretation Matthew Rosato
2021-12-08 7:53 ` kernel test robot
2021-12-09 19:54 ` Christian Borntraeger
2021-12-09 20:20 ` Matthew Rosato
2021-12-09 20:23 ` Christian Borntraeger
2021-12-10 8:36 ` Niklas Schnelle
2021-12-10 9:54 ` Pierre Morel
2021-12-10 10:55 ` Pierre Morel
2021-12-07 20:57 ` [PATCH 15/32] KVM: s390: pci: enable host forwarding of Adapter Event Notifications Matthew Rosato
2021-12-10 21:51 ` Eric Farman
2021-12-17 16:56 ` Christian Borntraeger
2021-12-17 17:42 ` Matthew Rosato
2021-12-07 20:57 ` [PATCH 16/32] KVM: s390: expose the guest zPCI interpretation facility Matthew Rosato
2021-12-17 15:05 ` Christian Borntraeger
2021-12-17 15:19 ` Matthew Rosato
2021-12-17 16:58 ` Christian Borntraeger
2021-12-17 17:13 ` Matthew Rosato
2021-12-07 20:57 ` [PATCH 17/32] KVM: s390: expose the guest Adapter Interruption Source ID facility Matthew Rosato
2021-12-17 15:06 ` Christian Borntraeger
2021-12-07 20:57 ` [PATCH 18/32] KVM: s390: expose guest Adapter Event Notification Interpretation facility Matthew Rosato
2021-12-07 20:57 ` [PATCH 19/32] KVM: s390: mechanism to enable guest zPCI Interpretation Matthew Rosato
2021-12-10 13:27 ` Christian Borntraeger
2021-12-10 14:21 ` Matthew Rosato
2021-12-07 20:57 ` [PATCH 20/32] KVM: s390: pci: provide routines for enabling/disabling interpretation Matthew Rosato
2021-12-08 9:44 ` Niklas Schnelle
2021-12-08 15:04 ` Matthew Rosato
2021-12-14 9:16 ` Pierre Morel
2021-12-07 20:57 ` [PATCH 21/32] KVM: s390: pci: provide routines for enabling/disabling interrupt forwarding Matthew Rosato
2021-12-08 10:58 ` kernel test robot
2021-12-14 9:26 ` Pierre Morel
2021-12-07 20:57 ` [PATCH 22/32] KVM: s390: pci: provide routines for enabling/disabling IOAT assist Matthew Rosato
2021-12-14 17:46 ` Pierre Morel [this message]
2021-12-14 18:13 ` Matthew Rosato
2021-12-07 20:57 ` [PATCH 23/32] KVM: s390: pci: handle refresh of PCI translations Matthew Rosato
2021-12-08 8:04 ` kernel test robot
2021-12-08 10:30 ` Niklas Schnelle
2021-12-08 18:04 ` Matthew Rosato
2021-12-14 16:59 ` Pierre Morel
2021-12-14 17:54 ` Matthew Rosato
2021-12-16 14:39 ` Niklas Schnelle
2021-12-16 14:51 ` Matthew Rosato
2021-12-17 9:41 ` Niklas Schnelle
2021-12-07 20:57 ` [PATCH 24/32] KVM: s390: intercept the rpcit instruction Matthew Rosato
2021-12-14 17:04 ` Pierre Morel
2021-12-14 18:00 ` Matthew Rosato
2021-12-07 20:57 ` [PATCH 25/32] vfio/pci: re-introduce CONFIG_VFIO_PCI_ZDEV Matthew Rosato
2021-12-17 16:49 ` Christian Borntraeger
2021-12-17 17:54 ` Matthew Rosato
2021-12-07 20:57 ` [PATCH 26/32] vfio-pci/zdev: wire up group notifier Matthew Rosato
2021-12-21 18:47 ` Alex Williamson
2021-12-07 20:57 ` [PATCH 27/32] vfio-pci/zdev: wire up zPCI interpretive execution support Matthew Rosato
2021-12-14 16:30 ` Pierre Morel
2021-12-21 18:48 ` Alex Williamson
2021-12-07 20:57 ` [PATCH 28/32] vfio-pci/zdev: wire up zPCI adapter interrupt forwarding support Matthew Rosato
2021-12-14 9:48 ` Pierre Morel
2021-12-07 20:57 ` [PATCH 29/32] vfio-pci/zdev: wire up zPCI IOAT assist support Matthew Rosato
2021-12-14 9:46 ` Pierre Morel
2021-12-07 20:57 ` [PATCH 30/32] vfio-pci/zdev: add DTSM to clp group capability Matthew Rosato
2021-12-14 9:58 ` Pierre Morel
2021-12-14 14:59 ` Matthew Rosato
2021-12-07 20:57 ` [PATCH 31/32] KVM: s390: introduce CPU feature for zPCI Interpretation Matthew Rosato
2021-12-07 20:57 ` [PATCH 32/32] MAINTAINERS: additional files related kvm s390 pci passthrough Matthew Rosato
2021-12-17 14:55 ` Christian Borntraeger
2021-12-21 19:11 ` Alex Williamson
2021-12-07 21:16 ` [PATCH 00/32] KVM: s390: enable zPCI for interpretive execution Matthew Rosato
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