| Message ID | 20210411120912.15770-15-eric.auger@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | vSMMUv3/pSMMUv3 2 stage VFIO integration | expand |
Hi Eric, On 2021/4/11 20:08, Eric Auger wrote: > Let's introduce two helpers that allow to DMA map/unmap a RAM > section. Those helpers will be called for nested stage setup in > another call site. Also the vfio_listener_region_add/del() > structure may be clearer. > > Signed-off-by: Eric Auger <eric.auger@redhat.com> > > --- > > v8 -> v9 > - rebase on top of > 1eb7f642750c ("vfio: Support host translation granule size") > > v5 -> v6: > - add Error ** > --- > hw/vfio/common.c | 199 +++++++++++++++++++++++++------------------ > hw/vfio/trace-events | 4 +- > 2 files changed, 119 insertions(+), 84 deletions(-) > > diff --git a/hw/vfio/common.c b/hw/vfio/common.c > index a8f835328e..0cd7ef2139 100644 > --- a/hw/vfio/common.c > +++ b/hw/vfio/common.c > @@ -662,13 +662,126 @@ hostwin_from_range(VFIOContainer *container, hwaddr iova, hwaddr end) > return NULL; > } > > +static int vfio_dma_map_ram_section(VFIOContainer *container, > + MemoryRegionSection *section, Error **err) > +{ > + VFIOHostDMAWindow *hostwin; > + Int128 llend, llsize; > + hwaddr iova, end; > + void *vaddr; > + int ret; > + > + assert(memory_region_is_ram(section->mr)); > + > + iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); > + llend = int128_make64(section->offset_within_address_space); > + llend = int128_add(llend, section->size); > + llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); > + end = int128_get64(int128_sub(llend, int128_one())); > + > + vaddr = memory_region_get_ram_ptr(section->mr) + > + section->offset_within_region + > + (iova - section->offset_within_address_space); > + > + hostwin = hostwin_from_range(container, iova, end); > + if (!hostwin) { > + error_setg(err, "Container %p can't map guest IOVA region" > + " 0x%"HWADDR_PRIx"..0x%"HWADDR_PRIx, container, iova, end); > + return -EFAULT; > + } > + > + trace_vfio_dma_map_ram(iova, end, vaddr); > + > + llsize = int128_sub(llend, int128_make64(iova)); > + > + if (memory_region_is_ram_device(section->mr)) { > + hwaddr pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; > + > + if ((iova & pgmask) || (int128_get64(llsize) & pgmask)) { > + trace_vfio_listener_region_add_no_dma_map( > + memory_region_name(section->mr), > + section->offset_within_address_space, > + int128_getlo(section->size), > + pgmask + 1); > + return 0; > + } > + } > + > + ret = vfio_dma_map(container, iova, int128_get64(llsize), > + vaddr, section->readonly); > + if (ret) { > + error_setg(err, "vfio_dma_map(%p, 0x%"HWADDR_PRIx", " > + "0x%"HWADDR_PRIx", %p) = %d (%m)", > + container, iova, int128_get64(llsize), vaddr, ret); > + if (memory_region_is_ram_device(section->mr)) { > + /* Allow unexpected mappings not to be fatal for RAM devices */ > + error_report_err(*err); > + return 0; > + } > + return ret; > + } > + return 0; > +} > + > +static void vfio_dma_unmap_ram_section(VFIOContainer *container, > + MemoryRegionSection *section) > +{ > + Int128 llend, llsize; > + hwaddr iova, end; > + bool try_unmap = true; > + int ret; > + > + iova = REAL_HOST_PAGE_ALIGN(section->offset_within_address_space); > + llend = int128_make64(section->offset_within_address_space); > + llend = int128_add(llend, section->size); > + llend = int128_and(llend, int128_exts64(qemu_real_host_page_mask)); > + > + if (int128_ge(int128_make64(iova), llend)) { > + return; > + } > + end = int128_get64(int128_sub(llend, int128_one())); > + > + llsize = int128_sub(llend, int128_make64(iova)); > + > + trace_vfio_dma_unmap_ram(iova, end); > + > + if (memory_region_is_ram_device(section->mr)) { > + hwaddr pgmask; > + VFIOHostDMAWindow *hostwin = hostwin_from_range(container, iova, end); > + > + assert(hostwin); /* or region_add() would have failed */ > + > + pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; > + try_unmap = !((iova & pgmask) || (int128_get64(llsize) & pgmask)); > + } > + > + if (try_unmap) { > + if (int128_eq(llsize, int128_2_64())) { > + /* The unmap ioctl doesn't accept a full 64-bit span. */ > + llsize = int128_rshift(llsize, 1); > + ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL); > + if (ret) { > + error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " > + "0x%"HWADDR_PRIx") = %d (%m)", > + container, iova, int128_get64(llsize), ret); > + } > + iova += int128_get64(llsize); > + } > + ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL); > + if (ret) { > + error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " > + "0x%"HWADDR_PRIx") = %d (%m)", > + container, iova, int128_get64(llsize), ret); > + } > + } > +} > + > static void vfio_listener_region_add(MemoryListener *listener, > MemoryRegionSection *section) > { > VFIOContainer *container = container_of(listener, VFIOContainer, listener); > hwaddr iova, end; > - Int128 llend, llsize; > - void *vaddr; > + Int128 llend; > int ret; > VFIOHostDMAWindow *hostwin; > Error *err = NULL; > @@ -814,39 +927,7 @@ static void vfio_listener_region_add(MemoryListener *listener, > } > > /* Here we assume that memory_region_is_ram(section->mr)==true */ > - > - vaddr = memory_region_get_ram_ptr(section->mr) + > - section->offset_within_region + > - (iova - section->offset_within_address_space); > - > - trace_vfio_listener_region_add_ram(iova, end, vaddr); > - > - llsize = int128_sub(llend, int128_make64(iova)); > - > - if (memory_region_is_ram_device(section->mr)) { > - hwaddr pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; > - > - if ((iova & pgmask) || (int128_get64(llsize) & pgmask)) { > - trace_vfio_listener_region_add_no_dma_map( > - memory_region_name(section->mr), > - section->offset_within_address_space, > - int128_getlo(section->size), > - pgmask + 1); > - return; > - } > - } > - > - ret = vfio_dma_map(container, iova, int128_get64(llsize), > - vaddr, section->readonly); > - if (ret) { > - error_setg(&err, "vfio_dma_map(%p, 0x%"HWADDR_PRIx", " > - "0x%"HWADDR_PRIx", %p) = %d (%m)", > - container, iova, int128_get64(llsize), vaddr, ret); > - if (memory_region_is_ram_device(section->mr)) { > - /* Allow unexpected mappings not to be fatal for RAM devices */ > - error_report_err(err); > - return; > - } > + if (vfio_dma_map_ram_section(container, section, &err)) { > goto fail; > } > > @@ -880,10 +961,6 @@ static void vfio_listener_region_del(MemoryListener *listener, > MemoryRegionSection *section) > { > VFIOContainer *container = container_of(listener, VFIOContainer, listener); > - hwaddr iova, end; > - Int128 llend, llsize; > - int ret; > - bool try_unmap = true; > > if (vfio_listener_skipped_section(section)) { > trace_vfio_listener_region_del_skip( > @@ -923,49 +1000,7 @@ static void vfio_listener_region_del(MemoryListener *listener, > */ > } There are some codes of vfio_listener_region_del() that just doesn't show up. I post it below. > if (memory_region_is_iommu(section->mr)) { > VFIOGuestIOMMU *giommu; > > QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) { > if (MEMORY_REGION(giommu->iommu) == section->mr && > giommu->n.start == section->offset_within_region) { > memory_region_unregister_iommu_notifier(section->mr, > &giommu->n); > QLIST_REMOVE(giommu, giommu_next); > g_free(giommu); > break; > } > } > > /* > * FIXME: We assume the one big unmap below is adequate to > * remove any individual page mappings in the IOMMU which > * might have been copied into VFIO. This works for a page table > * based IOMMU where a big unmap flattens a large range of > IO-PTEs. > * That may not be true for all IOMMU types. > */ > } I think we need a check here. If it is nested mode, just return after g_free(giommu). Because in nested mode, stage 2 (gpa->hpa) and the stage 1 (giova->gpa) are set separately. When hot delete a pci device, we are going to call vfio_listener_region_del() and vfio_prereg_listener_region_del(). So it's not appropriate to unmap RAM section in vfio_listener_region_del(). The RAM section will be unmap in vfio_prereg_listener_region_del(). Thanks, Kunkun Jiang > > - iova = REAL_HOST_PAGE_ALIGN(section->offset_within_address_space); > - llend = int128_make64(section->offset_within_address_space); > - llend = int128_add(llend, section->size); > - llend = int128_and(llend, int128_exts64(qemu_real_host_page_mask)); > - > - if (int128_ge(int128_make64(iova), llend)) { > - return; > - } > - end = int128_get64(int128_sub(llend, int128_one())); > - > - llsize = int128_sub(llend, int128_make64(iova)); > - > - trace_vfio_listener_region_del(iova, end); > - > - if (memory_region_is_ram_device(section->mr)) { > - hwaddr pgmask; > - VFIOHostDMAWindow *hostwin = hostwin_from_range(container, iova, end); > - > - assert(hostwin); /* or region_add() would have failed */ > - > - pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; > - try_unmap = !((iova & pgmask) || (int128_get64(llsize) & pgmask)); > - } > - > - if (try_unmap) { > - if (int128_eq(llsize, int128_2_64())) { > - /* The unmap ioctl doesn't accept a full 64-bit span. */ > - llsize = int128_rshift(llsize, 1); > - ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL); > - if (ret) { > - error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " > - "0x%"HWADDR_PRIx") = %d (%m)", > - container, iova, int128_get64(llsize), ret); > - } > - iova += int128_get64(llsize); > - } > - ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL); > - if (ret) { > - error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " > - "0x%"HWADDR_PRIx") = %d (%m)", > - container, iova, int128_get64(llsize), ret); > - } > - } > + vfio_dma_unmap_ram_section(container, section); > > memory_region_unref(section->mr); > > diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events > index 2a41326c0f..936d29d150 100644 > --- a/hw/vfio/trace-events > +++ b/hw/vfio/trace-events > @@ -99,10 +99,10 @@ vfio_iommu_map_notify(const char *op, uint64_t iova_start, uint64_t iova_end) "i > vfio_listener_region_add_skip(uint64_t start, uint64_t end) "SKIPPING region_add 0x%"PRIx64" - 0x%"PRIx64 > vfio_spapr_group_attach(int groupfd, int tablefd) "Attached groupfd %d to liobn fd %d" > vfio_listener_region_add_iommu(uint64_t start, uint64_t end) "region_add [iommu] 0x%"PRIx64" - 0x%"PRIx64 > -vfio_listener_region_add_ram(uint64_t iova_start, uint64_t iova_end, void *vaddr) "region_add [ram] 0x%"PRIx64" - 0x%"PRIx64" [%p]" > +vfio_dma_map_ram(uint64_t iova_start, uint64_t iova_end, void *vaddr) "region_add [ram] 0x%"PRIx64" - 0x%"PRIx64" [%p]" > vfio_listener_region_add_no_dma_map(const char *name, uint64_t iova, uint64_t size, uint64_t page_size) "Region \"%s\" 0x%"PRIx64" size=0x%"PRIx64" is not aligned to 0x%"PRIx64" and cannot be mapped for DMA" > vfio_listener_region_del_skip(uint64_t start, uint64_t end) "SKIPPING region_del 0x%"PRIx64" - 0x%"PRIx64 > -vfio_listener_region_del(uint64_t start, uint64_t end) "region_del 0x%"PRIx64" - 0x%"PRIx64 > +vfio_dma_unmap_ram(uint64_t start, uint64_t end) "region_del 0x%"PRIx64" - 0x%"PRIx64 > vfio_disconnect_container(int fd) "close container->fd=%d" > vfio_connect_existing_container(int groupid, int container_fd) "group=%d existing container fd=%d" > vfio_connect_new_container(int groupid, int container_fd) "group=%d new container fd=%d"
Hi Eric, On 2021/4/11 20:08, Eric Auger wrote: > Let's introduce two helpers that allow to DMA map/unmap a RAM > section. Those helpers will be called for nested stage setup in > another call site. Also the vfio_listener_region_add/del() > structure may be clearer. > > Signed-off-by: Eric Auger <eric.auger@redhat.com> > > --- > > v8 -> v9 > - rebase on top of > 1eb7f642750c ("vfio: Support host translation granule size") > > v5 -> v6: > - add Error ** > --- > hw/vfio/common.c | 199 +++++++++++++++++++++++++------------------ > hw/vfio/trace-events | 4 +- > 2 files changed, 119 insertions(+), 84 deletions(-) > > diff --git a/hw/vfio/common.c b/hw/vfio/common.c > index a8f835328e..0cd7ef2139 100644 > --- a/hw/vfio/common.c > +++ b/hw/vfio/common.c > @@ -662,13 +662,126 @@ hostwin_from_range(VFIOContainer *container, hwaddr iova, hwaddr end) > return NULL; > } > > +static int vfio_dma_map_ram_section(VFIOContainer *container, > + MemoryRegionSection *section, Error **err) > +{ > + VFIOHostDMAWindow *hostwin; > + Int128 llend, llsize; > + hwaddr iova, end; > + void *vaddr; > + int ret; > + > + assert(memory_region_is_ram(section->mr)); > + > + iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); > + llend = int128_make64(section->offset_within_address_space); > + llend = int128_add(llend, section->size); > + llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); Is there any special meaning for using TRAGET_PAGE_ALIGN here? REAL_HOST_PAGE_ALIGN is used in vfio_listener_region_add. And I think a check should be added here if using REAL_HOST_PAGE_ALIGN. > if (int128_ge(int128_make64(iova), llend)) { > return; > } It will cause an error log or 'assert(r ==a )' of int128_get64 by calling vfio_prereg_listener_region_add in some scenarios. Some devices' BAR may map MSI-X structures and others in one host page. By the way, is this set of patch to be updated after "/dev/iommu" is sent out? Thanks, Kunkun Jiang > + end = int128_get64(int128_sub(llend, int128_one())); > + > + vaddr = memory_region_get_ram_ptr(section->mr) + > + section->offset_within_region + > + (iova - section->offset_within_address_space); > + > + hostwin = hostwin_from_range(container, iova, end); > + if (!hostwin) { > + error_setg(err, "Container %p can't map guest IOVA region" > + " 0x%"HWADDR_PRIx"..0x%"HWADDR_PRIx, container, iova, end); > + return -EFAULT; > + } > + > + trace_vfio_dma_map_ram(iova, end, vaddr); > + > + llsize = int128_sub(llend, int128_make64(iova)); > + > + if (memory_region_is_ram_device(section->mr)) { > + hwaddr pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; > + > + if ((iova & pgmask) || (int128_get64(llsize) & pgmask)) { > + trace_vfio_listener_region_add_no_dma_map( > + memory_region_name(section->mr), > + section->offset_within_address_space, > + int128_getlo(section->size), > + pgmask + 1); > + return 0; > + } > + } > + > + ret = vfio_dma_map(container, iova, int128_get64(llsize), > + vaddr, section->readonly); > + if (ret) { > + error_setg(err, "vfio_dma_map(%p, 0x%"HWADDR_PRIx", " > + "0x%"HWADDR_PRIx", %p) = %d (%m)", > + container, iova, int128_get64(llsize), vaddr, ret); > + if (memory_region_is_ram_device(section->mr)) { > + /* Allow unexpected mappings not to be fatal for RAM devices */ > + error_report_err(*err); > + return 0; > + } > + return ret; > + } > + return 0; > +} > + > +static void vfio_dma_unmap_ram_section(VFIOContainer *container, > + MemoryRegionSection *section) > +{ > + Int128 llend, llsize; > + hwaddr iova, end; > + bool try_unmap = true; > + int ret; > + > + iova = REAL_HOST_PAGE_ALIGN(section->offset_within_address_space); > + llend = int128_make64(section->offset_within_address_space); > + llend = int128_add(llend, section->size); > + llend = int128_and(llend, int128_exts64(qemu_real_host_page_mask)); > + > + if (int128_ge(int128_make64(iova), llend)) { > + return; > + } > + end = int128_get64(int128_sub(llend, int128_one())); > + > + llsize = int128_sub(llend, int128_make64(iova)); > + > + trace_vfio_dma_unmap_ram(iova, end); > + > + if (memory_region_is_ram_device(section->mr)) { > + hwaddr pgmask; > + VFIOHostDMAWindow *hostwin = hostwin_from_range(container, iova, end); > + > + assert(hostwin); /* or region_add() would have failed */ > + > + pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; > + try_unmap = !((iova & pgmask) || (int128_get64(llsize) & pgmask)); > + } > + > + if (try_unmap) { > + if (int128_eq(llsize, int128_2_64())) { > + /* The unmap ioctl doesn't accept a full 64-bit span. */ > + llsize = int128_rshift(llsize, 1); > + ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL); > + if (ret) { > + error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " > + "0x%"HWADDR_PRIx") = %d (%m)", > + container, iova, int128_get64(llsize), ret); > + } > + iova += int128_get64(llsize); > + } > + ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL); > + if (ret) { > + error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " > + "0x%"HWADDR_PRIx") = %d (%m)", > + container, iova, int128_get64(llsize), ret); > + } > + } > +} > + > static void vfio_listener_region_add(MemoryListener *listener, > MemoryRegionSection *section) > { > VFIOContainer *container = container_of(listener, VFIOContainer, listener); > hwaddr iova, end; > - Int128 llend, llsize; > - void *vaddr; > + Int128 llend; > int ret; > VFIOHostDMAWindow *hostwin; > Error *err = NULL; > @@ -814,39 +927,7 @@ static void vfio_listener_region_add(MemoryListener *listener, > } > > /* Here we assume that memory_region_is_ram(section->mr)==true */ > - > - vaddr = memory_region_get_ram_ptr(section->mr) + > - section->offset_within_region + > - (iova - section->offset_within_address_space); > - > - trace_vfio_listener_region_add_ram(iova, end, vaddr); > - > - llsize = int128_sub(llend, int128_make64(iova)); > - > - if (memory_region_is_ram_device(section->mr)) { > - hwaddr pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; > - > - if ((iova & pgmask) || (int128_get64(llsize) & pgmask)) { > - trace_vfio_listener_region_add_no_dma_map( > - memory_region_name(section->mr), > - section->offset_within_address_space, > - int128_getlo(section->size), > - pgmask + 1); > - return; > - } > - } > - > - ret = vfio_dma_map(container, iova, int128_get64(llsize), > - vaddr, section->readonly); > - if (ret) { > - error_setg(&err, "vfio_dma_map(%p, 0x%"HWADDR_PRIx", " > - "0x%"HWADDR_PRIx", %p) = %d (%m)", > - container, iova, int128_get64(llsize), vaddr, ret); > - if (memory_region_is_ram_device(section->mr)) { > - /* Allow unexpected mappings not to be fatal for RAM devices */ > - error_report_err(err); > - return; > - } > + if (vfio_dma_map_ram_section(container, section, &err)) { > goto fail; > } > > @@ -880,10 +961,6 @@ static void vfio_listener_region_del(MemoryListener *listener, > MemoryRegionSection *section) > { > VFIOContainer *container = container_of(listener, VFIOContainer, listener); > - hwaddr iova, end; > - Int128 llend, llsize; > - int ret; > - bool try_unmap = true; > > if (vfio_listener_skipped_section(section)) { > trace_vfio_listener_region_del_skip( > @@ -923,49 +1000,7 @@ static void vfio_listener_region_del(MemoryListener *listener, > */ > } > > - iova = REAL_HOST_PAGE_ALIGN(section->offset_within_address_space); > - llend = int128_make64(section->offset_within_address_space); > - llend = int128_add(llend, section->size); > - llend = int128_and(llend, int128_exts64(qemu_real_host_page_mask)); > - > - if (int128_ge(int128_make64(iova), llend)) { > - return; > - } > - end = int128_get64(int128_sub(llend, int128_one())); > - > - llsize = int128_sub(llend, int128_make64(iova)); > - > - trace_vfio_listener_region_del(iova, end); > - > - if (memory_region_is_ram_device(section->mr)) { > - hwaddr pgmask; > - VFIOHostDMAWindow *hostwin = hostwin_from_range(container, iova, end); > - > - assert(hostwin); /* or region_add() would have failed */ > - > - pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; > - try_unmap = !((iova & pgmask) || (int128_get64(llsize) & pgmask)); > - } > - > - if (try_unmap) { > - if (int128_eq(llsize, int128_2_64())) { > - /* The unmap ioctl doesn't accept a full 64-bit span. */ > - llsize = int128_rshift(llsize, 1); > - ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL); > - if (ret) { > - error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " > - "0x%"HWADDR_PRIx") = %d (%m)", > - container, iova, int128_get64(llsize), ret); > - } > - iova += int128_get64(llsize); > - } > - ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL); > - if (ret) { > - error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " > - "0x%"HWADDR_PRIx") = %d (%m)", > - container, iova, int128_get64(llsize), ret); > - } > - } > + vfio_dma_unmap_ram_section(container, section); > > memory_region_unref(section->mr); > > diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events > index 2a41326c0f..936d29d150 100644 > --- a/hw/vfio/trace-events > +++ b/hw/vfio/trace-events > @@ -99,10 +99,10 @@ vfio_iommu_map_notify(const char *op, uint64_t iova_start, uint64_t iova_end) "i > vfio_listener_region_add_skip(uint64_t start, uint64_t end) "SKIPPING region_add 0x%"PRIx64" - 0x%"PRIx64 > vfio_spapr_group_attach(int groupfd, int tablefd) "Attached groupfd %d to liobn fd %d" > vfio_listener_region_add_iommu(uint64_t start, uint64_t end) "region_add [iommu] 0x%"PRIx64" - 0x%"PRIx64 > -vfio_listener_region_add_ram(uint64_t iova_start, uint64_t iova_end, void *vaddr) "region_add [ram] 0x%"PRIx64" - 0x%"PRIx64" [%p]" > +vfio_dma_map_ram(uint64_t iova_start, uint64_t iova_end, void *vaddr) "region_add [ram] 0x%"PRIx64" - 0x%"PRIx64" [%p]" > vfio_listener_region_add_no_dma_map(const char *name, uint64_t iova, uint64_t size, uint64_t page_size) "Region \"%s\" 0x%"PRIx64" size=0x%"PRIx64" is not aligned to 0x%"PRIx64" and cannot be mapped for DMA" > vfio_listener_region_del_skip(uint64_t start, uint64_t end) "SKIPPING region_del 0x%"PRIx64" - 0x%"PRIx64 > -vfio_listener_region_del(uint64_t start, uint64_t end) "region_del 0x%"PRIx64" - 0x%"PRIx64 > +vfio_dma_unmap_ram(uint64_t start, uint64_t end) "region_del 0x%"PRIx64" - 0x%"PRIx64 > vfio_disconnect_container(int fd) "close container->fd=%d" > vfio_connect_existing_container(int groupid, int container_fd) "group=%d existing container fd=%d" > vfio_connect_new_container(int groupid, int container_fd) "group=%d new container fd=%d"
diff --git a/hw/vfio/common.c b/hw/vfio/common.c index a8f835328e..0cd7ef2139 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -662,13 +662,126 @@ hostwin_from_range(VFIOContainer *container, hwaddr iova, hwaddr end) return NULL; } +static int vfio_dma_map_ram_section(VFIOContainer *container, + MemoryRegionSection *section, Error **err) +{ + VFIOHostDMAWindow *hostwin; + Int128 llend, llsize; + hwaddr iova, end; + void *vaddr; + int ret; + + assert(memory_region_is_ram(section->mr)); + + iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); + llend = int128_make64(section->offset_within_address_space); + llend = int128_add(llend, section->size); + llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); + end = int128_get64(int128_sub(llend, int128_one())); + + vaddr = memory_region_get_ram_ptr(section->mr) + + section->offset_within_region + + (iova - section->offset_within_address_space); + + hostwin = hostwin_from_range(container, iova, end); + if (!hostwin) { + error_setg(err, "Container %p can't map guest IOVA region" + " 0x%"HWADDR_PRIx"..0x%"HWADDR_PRIx, container, iova, end); + return -EFAULT; + } + + trace_vfio_dma_map_ram(iova, end, vaddr); + + llsize = int128_sub(llend, int128_make64(iova)); + + if (memory_region_is_ram_device(section->mr)) { + hwaddr pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; + + if ((iova & pgmask) || (int128_get64(llsize) & pgmask)) { + trace_vfio_listener_region_add_no_dma_map( + memory_region_name(section->mr), + section->offset_within_address_space, + int128_getlo(section->size), + pgmask + 1); + return 0; + } + } + + ret = vfio_dma_map(container, iova, int128_get64(llsize), + vaddr, section->readonly); + if (ret) { + error_setg(err, "vfio_dma_map(%p, 0x%"HWADDR_PRIx", " + "0x%"HWADDR_PRIx", %p) = %d (%m)", + container, iova, int128_get64(llsize), vaddr, ret); + if (memory_region_is_ram_device(section->mr)) { + /* Allow unexpected mappings not to be fatal for RAM devices */ + error_report_err(*err); + return 0; + } + return ret; + } + return 0; +} + +static void vfio_dma_unmap_ram_section(VFIOContainer *container, + MemoryRegionSection *section) +{ + Int128 llend, llsize; + hwaddr iova, end; + bool try_unmap = true; + int ret; + + iova = REAL_HOST_PAGE_ALIGN(section->offset_within_address_space); + llend = int128_make64(section->offset_within_address_space); + llend = int128_add(llend, section->size); + llend = int128_and(llend, int128_exts64(qemu_real_host_page_mask)); + + if (int128_ge(int128_make64(iova), llend)) { + return; + } + end = int128_get64(int128_sub(llend, int128_one())); + + llsize = int128_sub(llend, int128_make64(iova)); + + trace_vfio_dma_unmap_ram(iova, end); + + if (memory_region_is_ram_device(section->mr)) { + hwaddr pgmask; + VFIOHostDMAWindow *hostwin = hostwin_from_range(container, iova, end); + + assert(hostwin); /* or region_add() would have failed */ + + pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; + try_unmap = !((iova & pgmask) || (int128_get64(llsize) & pgmask)); + } + + if (try_unmap) { + if (int128_eq(llsize, int128_2_64())) { + /* The unmap ioctl doesn't accept a full 64-bit span. */ + llsize = int128_rshift(llsize, 1); + ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL); + if (ret) { + error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " + "0x%"HWADDR_PRIx") = %d (%m)", + container, iova, int128_get64(llsize), ret); + } + iova += int128_get64(llsize); + } + ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL); + if (ret) { + error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " + "0x%"HWADDR_PRIx") = %d (%m)", + container, iova, int128_get64(llsize), ret); + } + } +} + static void vfio_listener_region_add(MemoryListener *listener, MemoryRegionSection *section) { VFIOContainer *container = container_of(listener, VFIOContainer, listener); hwaddr iova, end; - Int128 llend, llsize; - void *vaddr; + Int128 llend; int ret; VFIOHostDMAWindow *hostwin; Error *err = NULL; @@ -814,39 +927,7 @@ static void vfio_listener_region_add(MemoryListener *listener, } /* Here we assume that memory_region_is_ram(section->mr)==true */ - - vaddr = memory_region_get_ram_ptr(section->mr) + - section->offset_within_region + - (iova - section->offset_within_address_space); - - trace_vfio_listener_region_add_ram(iova, end, vaddr); - - llsize = int128_sub(llend, int128_make64(iova)); - - if (memory_region_is_ram_device(section->mr)) { - hwaddr pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; - - if ((iova & pgmask) || (int128_get64(llsize) & pgmask)) { - trace_vfio_listener_region_add_no_dma_map( - memory_region_name(section->mr), - section->offset_within_address_space, - int128_getlo(section->size), - pgmask + 1); - return; - } - } - - ret = vfio_dma_map(container, iova, int128_get64(llsize), - vaddr, section->readonly); - if (ret) { - error_setg(&err, "vfio_dma_map(%p, 0x%"HWADDR_PRIx", " - "0x%"HWADDR_PRIx", %p) = %d (%m)", - container, iova, int128_get64(llsize), vaddr, ret); - if (memory_region_is_ram_device(section->mr)) { - /* Allow unexpected mappings not to be fatal for RAM devices */ - error_report_err(err); - return; - } + if (vfio_dma_map_ram_section(container, section, &err)) { goto fail; } @@ -880,10 +961,6 @@ static void vfio_listener_region_del(MemoryListener *listener, MemoryRegionSection *section) { VFIOContainer *container = container_of(listener, VFIOContainer, listener); - hwaddr iova, end; - Int128 llend, llsize; - int ret; - bool try_unmap = true; if (vfio_listener_skipped_section(section)) { trace_vfio_listener_region_del_skip( @@ -923,49 +1000,7 @@ static void vfio_listener_region_del(MemoryListener *listener, */ } - iova = REAL_HOST_PAGE_ALIGN(section->offset_within_address_space); - llend = int128_make64(section->offset_within_address_space); - llend = int128_add(llend, section->size); - llend = int128_and(llend, int128_exts64(qemu_real_host_page_mask)); - - if (int128_ge(int128_make64(iova), llend)) { - return; - } - end = int128_get64(int128_sub(llend, int128_one())); - - llsize = int128_sub(llend, int128_make64(iova)); - - trace_vfio_listener_region_del(iova, end); - - if (memory_region_is_ram_device(section->mr)) { - hwaddr pgmask; - VFIOHostDMAWindow *hostwin = hostwin_from_range(container, iova, end); - - assert(hostwin); /* or region_add() would have failed */ - - pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; - try_unmap = !((iova & pgmask) || (int128_get64(llsize) & pgmask)); - } - - if (try_unmap) { - if (int128_eq(llsize, int128_2_64())) { - /* The unmap ioctl doesn't accept a full 64-bit span. */ - llsize = int128_rshift(llsize, 1); - ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL); - if (ret) { - error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " - "0x%"HWADDR_PRIx") = %d (%m)", - container, iova, int128_get64(llsize), ret); - } - iova += int128_get64(llsize); - } - ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL); - if (ret) { - error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " - "0x%"HWADDR_PRIx") = %d (%m)", - container, iova, int128_get64(llsize), ret); - } - } + vfio_dma_unmap_ram_section(container, section); memory_region_unref(section->mr); diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events index 2a41326c0f..936d29d150 100644 --- a/hw/vfio/trace-events +++ b/hw/vfio/trace-events @@ -99,10 +99,10 @@ vfio_iommu_map_notify(const char *op, uint64_t iova_start, uint64_t iova_end) "i vfio_listener_region_add_skip(uint64_t start, uint64_t end) "SKIPPING region_add 0x%"PRIx64" - 0x%"PRIx64 vfio_spapr_group_attach(int groupfd, int tablefd) "Attached groupfd %d to liobn fd %d" vfio_listener_region_add_iommu(uint64_t start, uint64_t end) "region_add [iommu] 0x%"PRIx64" - 0x%"PRIx64 -vfio_listener_region_add_ram(uint64_t iova_start, uint64_t iova_end, void *vaddr) "region_add [ram] 0x%"PRIx64" - 0x%"PRIx64" [%p]" +vfio_dma_map_ram(uint64_t iova_start, uint64_t iova_end, void *vaddr) "region_add [ram] 0x%"PRIx64" - 0x%"PRIx64" [%p]" vfio_listener_region_add_no_dma_map(const char *name, uint64_t iova, uint64_t size, uint64_t page_size) "Region \"%s\" 0x%"PRIx64" size=0x%"PRIx64" is not aligned to 0x%"PRIx64" and cannot be mapped for DMA" vfio_listener_region_del_skip(uint64_t start, uint64_t end) "SKIPPING region_del 0x%"PRIx64" - 0x%"PRIx64 -vfio_listener_region_del(uint64_t start, uint64_t end) "region_del 0x%"PRIx64" - 0x%"PRIx64 +vfio_dma_unmap_ram(uint64_t start, uint64_t end) "region_del 0x%"PRIx64" - 0x%"PRIx64 vfio_disconnect_container(int fd) "close container->fd=%d" vfio_connect_existing_container(int groupid, int container_fd) "group=%d existing container fd=%d" vfio_connect_new_container(int groupid, int container_fd) "group=%d new container fd=%d"
Let's introduce two helpers that allow to DMA map/unmap a RAM section. Those helpers will be called for nested stage setup in another call site. Also the vfio_listener_region_add/del() structure may be clearer. Signed-off-by: Eric Auger <eric.auger@redhat.com> --- v8 -> v9 - rebase on top of 1eb7f642750c ("vfio: Support host translation granule size") v5 -> v6: - add Error ** --- hw/vfio/common.c | 199 +++++++++++++++++++++++++------------------ hw/vfio/trace-events | 4 +- 2 files changed, 119 insertions(+), 84 deletions(-)