| Message ID | 20211207205743.150299-23-mjrosato@linux.ibm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | KVM: s390: enable zPCI for interpretive execution | expand |
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... >
On 12/14/21 12:46 PM, Pierre Morel wrote: > > > 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. I tend to get overzealous with these checks.. > 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. Sure > >> + >> + /* 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)); In relation to your question below about where things are being pinned... Here the call to gfn_to_page does the pin (this call eventually drives hva_to_pfn for pinning) >> + 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; ^^ here we store what was pinned above in ioat->head[] and can use it later for unpinning. But looking again now I think for the is_error_page() case above here I should also be going to unpin: to cleanup in case we were somewhere in the middle of the loop and so have some pages pinned already. >> + 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. See above. > >> + ioat->head[i] = 0; >> + } >> + mutex_unlock(&ioat->lock); >> + return -ENOMEM; >> +} >> +EXPORT_SYMBOL_GPL(kvm_s390_pci_ioat_enable); >> + > > ...snip... >> >
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; + + /* 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); + ioat->head[i] = 0; + } + mutex_unlock(&ioat->lock); + return -ENOMEM; +} +EXPORT_SYMBOL_GPL(kvm_s390_pci_ioat_enable); + +static void free_pt_entry(struct kvm_zdev_ioat *ioat, int st, int pt) +{ + if (!ioat->pt[st][pt]) + return; + + kvm_release_pfn_dirty((u64)ioat->pt[st][pt]); +} + +static void free_seg_entry(struct kvm_zdev_ioat *ioat, int entry) +{ + int i, st, count = 0; + + for (i = 0; i < ZPCI_TABLE_PAGES; i++) { + if (ioat->seg[entry + i]) { + kvm_release_pfn_dirty((u64)ioat->seg[entry + i]); + count++; + } + } + + if (count == 0) + return; + + st = entry / ZPCI_TABLE_PAGES; + for (i = 0; i < ZPCI_TABLE_ENTRIES; i++) + free_pt_entry(ioat, st, i); + kfree(ioat->pt[st]); +} + +int kvm_s390_pci_ioat_disable(struct zpci_dev *zdev) +{ + struct kvm_zdev_ioat *ioat; + int i; + + if (!zdev->kzdev || !zdev->kzdev->kvm || !zdev->kzdev->ioat.head[0]) + return -EINVAL; + + ioat = &zdev->kzdev->ioat; + mutex_lock(&ioat->lock); + for (i = 0; i < ZPCI_TABLE_PAGES; i++) { + kvm_release_pfn_dirty((u64)ioat->head[i] >> PAGE_SHIFT); + ioat->head[i] = 0; + } + + for (i = 0; i < ZPCI_TABLE_ENTRIES_PAGES; i += ZPCI_TABLE_PAGES) + free_seg_entry(ioat, i); + + kfree(ioat->seg); + kfree(ioat->pt); + mutex_unlock(&ioat->lock); + + return 0; +} +EXPORT_SYMBOL_GPL(kvm_s390_pci_ioat_disable); + +u8 kvm_s390_pci_get_dtsm(struct zpci_dev *zdev) +{ + return (zdev->dtsm & KVM_S390_PCI_DTSM_MASK); +} +EXPORT_SYMBOL_GPL(kvm_s390_pci_get_dtsm); + int kvm_s390_pci_interp_probe(struct zpci_dev *zdev) { if (!(sclp.has_zpci_interp && test_facility(69))) @@ -387,6 +513,10 @@ int kvm_s390_pci_interp_disable(struct zpci_dev *zdev) if (zdev->kzdev->fib.fmt0.aibv != 0) kvm_s390_pci_aif_disable(zdev); + /* If we are using the IOAT assist, disable it now */ + if (zdev->kzdev->ioat.head[0]) + kvm_s390_pci_ioat_disable(zdev); + /* Remove the host CLP guest designation */ zdev->gd = 0; @@ -419,6 +549,8 @@ int kvm_s390_pci_dev_open(struct zpci_dev *zdev) if (!kzdev) return -ENOMEM; + mutex_init(&kzdev->ioat.lock); + kzdev->zdev = zdev; zdev->kzdev = kzdev; @@ -436,6 +568,7 @@ void kvm_s390_pci_dev_release(struct zpci_dev *zdev) kzdev = zdev->kzdev; WARN_ON(kzdev->zdev != zdev); zdev->kzdev = 0; + mutex_destroy(&kzdev->ioat.lock); kfree(kzdev); } diff --git a/arch/s390/kvm/pci.h b/arch/s390/kvm/pci.h index 776b2745c675..3c86888fe1b3 100644 --- a/arch/s390/kvm/pci.h +++ b/arch/s390/kvm/pci.h @@ -16,6 +16,8 @@ #include <asm/airq.h> #include <asm/kvm_pci.h> +#define KVM_S390_PCI_DTSM_MASK 0x40 + struct zpci_gaite { unsigned int gisa; u8 gisc;
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(+)