| Message ID | 1466471645-5396-5-git-send-email-aik@ozlabs.ru |
|---|---|
| State | New |
| Headers | show |
On Tue, Jun 21, 2016 at 11:14:04AM +1000, Alexey Kardashevskiy wrote: > New VFIO_SPAPR_TCE_v2_IOMMU type supports dynamic DMA window management. > This adds ability to VFIO common code to dynamically allocate/remove > DMA windows in the host kernel when new VFIO container is added/removed. > > This adds a helper to vfio_listener_region_add which makes > VFIO_IOMMU_SPAPR_TCE_CREATE ioctl and adds just created IOMMU into > the host IOMMU list; the opposite action is taken in > vfio_listener_region_del. > > When creating a new window, this uses heuristic to decide on the TCE table > levels number. > > This should cause no guest visible change in behavior. > > Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> > --- > Changes: > v18: > * moved trace definitions under hw/vfio/spapr.c section > * moved trace_vfio_spapr_remove_window to vfio_spapr_remove_window() > * vfio_host_win_del() now checks for exact window size > * one ctz() less in vfio_spapr_create_window() > > v17: > * moved spapr window create/remove helpers to separate file > * added hw_error() if vfio_host_win_del() failed > > v16: > * used memory_region_iommu_get_page_sizes() in vfio_listener_region_add() > * enforced no intersections between windows > > v14: > * new to the series > --- > hw/vfio/common.c | 79 +++++++++++++++++++++++++++++++++++++------ > hw/vfio/spapr.c | 71 ++++++++++++++++++++++++++++++++++++++ > include/hw/vfio/vfio-common.h | 6 ++++ > trace-events | 2 ++ > 4 files changed, 148 insertions(+), 10 deletions(-) > > diff --git a/hw/vfio/common.c b/hw/vfio/common.c > index b53a1db..8e3466c 100644 > --- a/hw/vfio/common.c > +++ b/hw/vfio/common.c > @@ -265,6 +265,21 @@ static void vfio_host_win_add(VFIOContainer *container, > QLIST_INSERT_HEAD(&container->hostwin_list, hostwin, hostwin_next); > } > > +static int vfio_host_win_del(VFIOContainer *container, hwaddr min_iova, > + hwaddr max_iova) > +{ > + VFIOHostDMAWindow *hostwin; > + > + QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { > + if (hostwin->min_iova == min_iova && hostwin->max_iova == max_iova) { > + QLIST_REMOVE(hostwin, hostwin_next); > + return 0; > + } > + } > + > + return -1; > +} > + > static bool vfio_listener_skipped_section(MemoryRegionSection *section) > { > return (!memory_region_is_ram(section->mr) && > @@ -380,6 +395,30 @@ static void vfio_listener_region_add(MemoryListener *listener, > } > end = int128_get64(int128_sub(llend, int128_one())); > > + if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { > + VFIOHostDMAWindow *hostwin; > + hwaddr pgsize = 0; > + > + /* For now intersections are not allowed, we may relax this later */ > + QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { > + if (ranges_overlap(hostwin->min_iova, > + hostwin->max_iova - hostwin->min_iova + 1, > + section->offset_within_address_space, > + int128_get64(section->size))) { > + goto fail; > + } > + } > + > + ret = vfio_spapr_create_window(container, section, &pgsize); > + if (ret) { > + goto fail; > + } > + > + vfio_host_win_add(container, section->offset_within_address_space, > + section->offset_within_address_space + > + int128_get64(section->size) - 1, pgsize); > + } > + > hostwin_found = false; > QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { > if (hostwin->min_iova <= iova && end <= hostwin->max_iova) { > @@ -522,6 +561,18 @@ static void vfio_listener_region_del(MemoryListener *listener, > "0x%"HWADDR_PRIx") = %d (%m)", > container, iova, int128_get64(llsize), ret); > } > + > + if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { > + vfio_spapr_remove_window(container, > + section->offset_within_address_space); > + if (vfio_host_win_del(container, > + section->offset_within_address_space, > + section->offset_within_address_space + > + int128_get64(section->size) - 1) < 0) { > + hw_error("%s: Cannot delete missing window at %"HWADDR_PRIx, > + __func__, section->offset_within_address_space); > + } > + } > } > > static const MemoryListener vfio_memory_listener = { > @@ -960,11 +1011,6 @@ static int vfio_connect_container(VFIOGroup *group, AddressSpace *as) > } > } > > - /* > - * This only considers the host IOMMU's 32-bit window. At > - * some point we need to add support for the optional 64-bit > - * window and dynamic windows > - */ > info.argsz = sizeof(info); > ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info); > if (ret) { > @@ -976,11 +1022,24 @@ static int vfio_connect_container(VFIOGroup *group, AddressSpace *as) > goto listener_release_exit; > } > > - /* The default table uses 4K pages */ > - vfio_host_win_add(container, info.dma32_window_start, > - info.dma32_window_start + > - info.dma32_window_size - 1, > - 0x1000); > + if (v2) { > + /* > + * There is a default window in just created container. > + * To make region_add/del simpler, we better remove this > + * window now and let those iommu_listener callbacks > + * create/remove them when needed. > + */ > + ret = vfio_spapr_remove_window(container, info.dma32_window_start); > + if (ret) { > + goto free_container_exit; > + } > + } else { > + /* The default table uses 4K pages */ > + vfio_host_win_add(container, info.dma32_window_start, > + info.dma32_window_start + > + info.dma32_window_size - 1, > + 0x1000); > + } > } else { > error_report("vfio: No available IOMMU models"); > ret = -EINVAL; > diff --git a/hw/vfio/spapr.c b/hw/vfio/spapr.c > index 5c29bec..852da0b 100644 > --- a/hw/vfio/spapr.c > +++ b/hw/vfio/spapr.c > @@ -137,3 +137,74 @@ const MemoryListener vfio_prereg_listener = { > .region_add = vfio_prereg_listener_region_add, > .region_del = vfio_prereg_listener_region_del, > }; > + > +int vfio_spapr_create_window(VFIOContainer *container, > + MemoryRegionSection *section, > + hwaddr *pgsize) > +{ > + int ret; > + unsigned pagesize = memory_region_iommu_get_min_page_size(section->mr); > + unsigned entries, pages; > + struct vfio_iommu_spapr_tce_create create = { .argsz = sizeof(create) }; > + > + /* > + * FIXME: For VFIO iommu types which have KVM acceleration to > + * avoid bouncing all map/unmaps through qemu this way, this > + * would be the right place to wire that up (tell the KVM > + * device emulation the VFIO iommu handles to use). > + */ > + create.window_size = int128_get64(section->size); > + create.page_shift = ctz64(pagesize); > + /* > + * SPAPR host supports multilevel TCE tables, there is some > + * heuristic to decide how many levels we want for our table: > + * 0..64 = 1; 65..4096 = 2; 4097..262144 = 3; 262145.. = 4 > + */ > + entries = create.window_size >> create.page_shift; > + pages = MAX((entries * sizeof(uint64_t)) / getpagesize(), 1); > + pages = MAX(pow2ceil(pages) - 1, 1); /* Round up */ > + create.levels = ctz64(pages) / 6 + 1; > + > + ret = ioctl(container->fd, VFIO_IOMMU_SPAPR_TCE_CREATE, &create); > + if (ret) { > + error_report("Failed to create a window, ret = %d (%m)", ret); > + return -errno; > + } > + > + if (create.start_addr != section->offset_within_address_space) { > + vfio_spapr_remove_window(container, create.start_addr); > + > + error_report("Host doesn't support DMA window at %"HWADDR_PRIx", must be %"PRIx64, > + section->offset_within_address_space, > + create.start_addr); > + ioctl(container->fd, VFIO_IOMMU_SPAPR_TCE_REMOVE, &remove); > + return -EINVAL; > + } > + trace_vfio_spapr_create_window(create.page_shift, > + create.window_size, > + create.start_addr); > + *pgsize = pagesize; > + > + return 0; > +} > + > +int vfio_spapr_remove_window(VFIOContainer *container, > + hwaddr offset_within_address_space) > +{ > + struct vfio_iommu_spapr_tce_remove remove = { > + .argsz = sizeof(remove), > + .start_addr = offset_within_address_space, > + }; > + int ret; > + > + ret = ioctl(container->fd, VFIO_IOMMU_SPAPR_TCE_REMOVE, &remove); > + if (ret) { > + error_report("Failed to remove window at %"PRIx64, > + remove.start_addr); > + return -errno; > + } > + > + trace_vfio_spapr_remove_window(offset_within_address_space); > + > + return 0; > +} > diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h > index b1f3e92..07f7188 100644 > --- a/include/hw/vfio/vfio-common.h > +++ b/include/hw/vfio/vfio-common.h > @@ -168,4 +168,10 @@ int vfio_get_dev_region_info(VFIODevice *vbasedev, uint32_t type, > #endif > extern const MemoryListener vfio_prereg_listener; > > +int vfio_spapr_create_window(VFIOContainer *container, > + MemoryRegionSection *section, > + hwaddr *pgsize); > +int vfio_spapr_remove_window(VFIOContainer *container, > + hwaddr offset_within_address_space); > + > #endif /* !HW_VFIO_VFIO_COMMON_H */ > diff --git a/trace-events b/trace-events > index 0b1583f..7e94d92 100644 > --- a/trace-events > +++ b/trace-events > @@ -1775,6 +1775,8 @@ vfio_prereg_listener_region_add_skip(uint64_t start, uint64_t end) "SKIPPING reg > vfio_prereg_listener_region_del_skip(uint64_t start, uint64_t end) "SKIPPING region_del %"PRIx64" - %"PRIx64 > vfio_prereg_register(uint64_t va, uint64_t size, int ret) "va=%"PRIx64" size=%"PRIx64" ret=%d" > vfio_prereg_unregister(uint64_t va, uint64_t size, int ret) "va=%"PRIx64" size=%"PRIx64" ret=%d" > +vfio_spapr_create_window(int ps, uint64_t ws, uint64_t off) "pageshift=0x%x winsize=0x%"PRIx64" offset=0x%"PRIx64 > +vfio_spapr_remove_window(uint64_t off) "offset=%"PRIx64 > > # hw/vfio/platform.c > vfio_platform_base_device_init(char *name, int groupid) "%s belongs to group #%d"
On 21/06/2016 03:14, Alexey Kardashevskiy wrote: > New VFIO_SPAPR_TCE_v2_IOMMU type supports dynamic DMA window management. > This adds ability to VFIO common code to dynamically allocate/remove > DMA windows in the host kernel when new VFIO container is added/removed. > > This adds a helper to vfio_listener_region_add which makes > VFIO_IOMMU_SPAPR_TCE_CREATE ioctl and adds just created IOMMU into > the host IOMMU list; the opposite action is taken in > vfio_listener_region_del. > > When creating a new window, this uses heuristic to decide on the TCE table > levels number. > > This should cause no guest visible change in behavior. > > Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> > --- > Changes: > v18: > * moved trace definitions under hw/vfio/spapr.c section > * moved trace_vfio_spapr_remove_window to vfio_spapr_remove_window() > * vfio_host_win_del() now checks for exact window size > * one ctz() less in vfio_spapr_create_window() > > v17: > * moved spapr window create/remove helpers to separate file > * added hw_error() if vfio_host_win_del() failed > > v16: > * used memory_region_iommu_get_page_sizes() in vfio_listener_region_add() > * enforced no intersections between windows > > v14: > * new to the series > --- > hw/vfio/common.c | 79 +++++++++++++++++++++++++++++++++++++------ > hw/vfio/spapr.c | 71 ++++++++++++++++++++++++++++++++++++++ > include/hw/vfio/vfio-common.h | 6 ++++ > trace-events | 2 ++ > 4 files changed, 148 insertions(+), 10 deletions(-) > > diff --git a/hw/vfio/common.c b/hw/vfio/common.c > index b53a1db..8e3466c 100644 > --- a/hw/vfio/common.c > +++ b/hw/vfio/common.c > @@ -265,6 +265,21 @@ static void vfio_host_win_add(VFIOContainer *container, > QLIST_INSERT_HEAD(&container->hostwin_list, hostwin, hostwin_next); > } > > +static int vfio_host_win_del(VFIOContainer *container, hwaddr min_iova, > + hwaddr max_iova) > +{ > + VFIOHostDMAWindow *hostwin; > + > + QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { > + if (hostwin->min_iova == min_iova && hostwin->max_iova == max_iova) { > + QLIST_REMOVE(hostwin, hostwin_next); > + return 0; > + } > + } > + > + return -1; > +} > + > static bool vfio_listener_skipped_section(MemoryRegionSection *section) > { > return (!memory_region_is_ram(section->mr) && > @@ -380,6 +395,30 @@ static void vfio_listener_region_add(MemoryListener *listener, > } > end = int128_get64(int128_sub(llend, int128_one())); > > + if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { > + VFIOHostDMAWindow *hostwin; > + hwaddr pgsize = 0; > + > + /* For now intersections are not allowed, we may relax this later */ > + QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { > + if (ranges_overlap(hostwin->min_iova, > + hostwin->max_iova - hostwin->min_iova + 1, > + section->offset_within_address_space, > + int128_get64(section->size))) { > + goto fail; ret is not initialized and it is used in "fail:". hw/vfio/common.c: In function ‘vfio_listener_region_add’: hw/vfio/common.c:493:30: error: ‘ret’ may be used uninitialized in this function [-Werror=maybe-uninitialized] container->error = ret; Laurent
On 23/06/16 00:38, Laurent Vivier wrote: > > > On 21/06/2016 03:14, Alexey Kardashevskiy wrote: >> New VFIO_SPAPR_TCE_v2_IOMMU type supports dynamic DMA window management. >> This adds ability to VFIO common code to dynamically allocate/remove >> DMA windows in the host kernel when new VFIO container is added/removed. >> >> This adds a helper to vfio_listener_region_add which makes >> VFIO_IOMMU_SPAPR_TCE_CREATE ioctl and adds just created IOMMU into >> the host IOMMU list; the opposite action is taken in >> vfio_listener_region_del. >> >> When creating a new window, this uses heuristic to decide on the TCE table >> levels number. >> >> This should cause no guest visible change in behavior. >> >> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> >> --- >> Changes: >> v18: >> * moved trace definitions under hw/vfio/spapr.c section >> * moved trace_vfio_spapr_remove_window to vfio_spapr_remove_window() >> * vfio_host_win_del() now checks for exact window size >> * one ctz() less in vfio_spapr_create_window() >> >> v17: >> * moved spapr window create/remove helpers to separate file >> * added hw_error() if vfio_host_win_del() failed >> >> v16: >> * used memory_region_iommu_get_page_sizes() in vfio_listener_region_add() >> * enforced no intersections between windows >> >> v14: >> * new to the series >> --- >> hw/vfio/common.c | 79 +++++++++++++++++++++++++++++++++++++------ >> hw/vfio/spapr.c | 71 ++++++++++++++++++++++++++++++++++++++ >> include/hw/vfio/vfio-common.h | 6 ++++ >> trace-events | 2 ++ >> 4 files changed, 148 insertions(+), 10 deletions(-) >> >> diff --git a/hw/vfio/common.c b/hw/vfio/common.c >> index b53a1db..8e3466c 100644 >> --- a/hw/vfio/common.c >> +++ b/hw/vfio/common.c >> @@ -265,6 +265,21 @@ static void vfio_host_win_add(VFIOContainer *container, >> QLIST_INSERT_HEAD(&container->hostwin_list, hostwin, hostwin_next); >> } >> >> +static int vfio_host_win_del(VFIOContainer *container, hwaddr min_iova, >> + hwaddr max_iova) >> +{ >> + VFIOHostDMAWindow *hostwin; >> + >> + QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { >> + if (hostwin->min_iova == min_iova && hostwin->max_iova == max_iova) { >> + QLIST_REMOVE(hostwin, hostwin_next); >> + return 0; >> + } >> + } >> + >> + return -1; >> +} >> + >> static bool vfio_listener_skipped_section(MemoryRegionSection *section) >> { >> return (!memory_region_is_ram(section->mr) && >> @@ -380,6 +395,30 @@ static void vfio_listener_region_add(MemoryListener *listener, >> } >> end = int128_get64(int128_sub(llend, int128_one())); >> >> + if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { >> + VFIOHostDMAWindow *hostwin; >> + hwaddr pgsize = 0; >> + >> + /* For now intersections are not allowed, we may relax this later */ >> + QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { >> + if (ranges_overlap(hostwin->min_iova, >> + hostwin->max_iova - hostwin->min_iova + 1, >> + section->offset_within_address_space, >> + int128_get64(section->size))) { >> + goto fail; > > ret is not initialized and it is used in "fail:". > > hw/vfio/common.c: In function ‘vfio_listener_region_add’: > hw/vfio/common.c:493:30: error: ‘ret’ may be used uninitialized in this > function [-Werror=maybe-uninitialized] > container->error = ret; Oh. Thanks for reporting. I use cross gcc and there must be something I am doing wrong as I do not see these warnings but I do see them when compile with native compiler...
On 23/06/16 13:59, Alexey Kardashevskiy wrote: >> ret is not initialized and it is used in "fail:". >> >> hw/vfio/common.c: In function ‘vfio_listener_region_add’: >> hw/vfio/common.c:493:30: error: ‘ret’ may be used uninitialized in this >> function [-Werror=maybe-uninitialized] >> container->error = ret; > > Oh. Thanks for reporting. I use cross gcc and there must be something I am > doing wrong as I do not see these warnings but I do see them when compile > with native compiler... Ah, figured out - gcc -O2 enables the warning, and I always configure with --enable-debug so gcc is not getting -O2. Will pay attention to this from now on.
diff --git a/hw/vfio/common.c b/hw/vfio/common.c index b53a1db..8e3466c 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -265,6 +265,21 @@ static void vfio_host_win_add(VFIOContainer *container, QLIST_INSERT_HEAD(&container->hostwin_list, hostwin, hostwin_next); } +static int vfio_host_win_del(VFIOContainer *container, hwaddr min_iova, + hwaddr max_iova) +{ + VFIOHostDMAWindow *hostwin; + + QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { + if (hostwin->min_iova == min_iova && hostwin->max_iova == max_iova) { + QLIST_REMOVE(hostwin, hostwin_next); + return 0; + } + } + + return -1; +} + static bool vfio_listener_skipped_section(MemoryRegionSection *section) { return (!memory_region_is_ram(section->mr) && @@ -380,6 +395,30 @@ static void vfio_listener_region_add(MemoryListener *listener, } end = int128_get64(int128_sub(llend, int128_one())); + if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { + VFIOHostDMAWindow *hostwin; + hwaddr pgsize = 0; + + /* For now intersections are not allowed, we may relax this later */ + QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { + if (ranges_overlap(hostwin->min_iova, + hostwin->max_iova - hostwin->min_iova + 1, + section->offset_within_address_space, + int128_get64(section->size))) { + goto fail; + } + } + + ret = vfio_spapr_create_window(container, section, &pgsize); + if (ret) { + goto fail; + } + + vfio_host_win_add(container, section->offset_within_address_space, + section->offset_within_address_space + + int128_get64(section->size) - 1, pgsize); + } + hostwin_found = false; QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { if (hostwin->min_iova <= iova && end <= hostwin->max_iova) { @@ -522,6 +561,18 @@ static void vfio_listener_region_del(MemoryListener *listener, "0x%"HWADDR_PRIx") = %d (%m)", container, iova, int128_get64(llsize), ret); } + + if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { + vfio_spapr_remove_window(container, + section->offset_within_address_space); + if (vfio_host_win_del(container, + section->offset_within_address_space, + section->offset_within_address_space + + int128_get64(section->size) - 1) < 0) { + hw_error("%s: Cannot delete missing window at %"HWADDR_PRIx, + __func__, section->offset_within_address_space); + } + } } static const MemoryListener vfio_memory_listener = { @@ -960,11 +1011,6 @@ static int vfio_connect_container(VFIOGroup *group, AddressSpace *as) } } - /* - * This only considers the host IOMMU's 32-bit window. At - * some point we need to add support for the optional 64-bit - * window and dynamic windows - */ info.argsz = sizeof(info); ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info); if (ret) { @@ -976,11 +1022,24 @@ static int vfio_connect_container(VFIOGroup *group, AddressSpace *as) goto listener_release_exit; } - /* The default table uses 4K pages */ - vfio_host_win_add(container, info.dma32_window_start, - info.dma32_window_start + - info.dma32_window_size - 1, - 0x1000); + if (v2) { + /* + * There is a default window in just created container. + * To make region_add/del simpler, we better remove this + * window now and let those iommu_listener callbacks + * create/remove them when needed. + */ + ret = vfio_spapr_remove_window(container, info.dma32_window_start); + if (ret) { + goto free_container_exit; + } + } else { + /* The default table uses 4K pages */ + vfio_host_win_add(container, info.dma32_window_start, + info.dma32_window_start + + info.dma32_window_size - 1, + 0x1000); + } } else { error_report("vfio: No available IOMMU models"); ret = -EINVAL; diff --git a/hw/vfio/spapr.c b/hw/vfio/spapr.c index 5c29bec..852da0b 100644 --- a/hw/vfio/spapr.c +++ b/hw/vfio/spapr.c @@ -137,3 +137,74 @@ const MemoryListener vfio_prereg_listener = { .region_add = vfio_prereg_listener_region_add, .region_del = vfio_prereg_listener_region_del, }; + +int vfio_spapr_create_window(VFIOContainer *container, + MemoryRegionSection *section, + hwaddr *pgsize) +{ + int ret; + unsigned pagesize = memory_region_iommu_get_min_page_size(section->mr); + unsigned entries, pages; + struct vfio_iommu_spapr_tce_create create = { .argsz = sizeof(create) }; + + /* + * FIXME: For VFIO iommu types which have KVM acceleration to + * avoid bouncing all map/unmaps through qemu this way, this + * would be the right place to wire that up (tell the KVM + * device emulation the VFIO iommu handles to use). + */ + create.window_size = int128_get64(section->size); + create.page_shift = ctz64(pagesize); + /* + * SPAPR host supports multilevel TCE tables, there is some + * heuristic to decide how many levels we want for our table: + * 0..64 = 1; 65..4096 = 2; 4097..262144 = 3; 262145.. = 4 + */ + entries = create.window_size >> create.page_shift; + pages = MAX((entries * sizeof(uint64_t)) / getpagesize(), 1); + pages = MAX(pow2ceil(pages) - 1, 1); /* Round up */ + create.levels = ctz64(pages) / 6 + 1; + + ret = ioctl(container->fd, VFIO_IOMMU_SPAPR_TCE_CREATE, &create); + if (ret) { + error_report("Failed to create a window, ret = %d (%m)", ret); + return -errno; + } + + if (create.start_addr != section->offset_within_address_space) { + vfio_spapr_remove_window(container, create.start_addr); + + error_report("Host doesn't support DMA window at %"HWADDR_PRIx", must be %"PRIx64, + section->offset_within_address_space, + create.start_addr); + ioctl(container->fd, VFIO_IOMMU_SPAPR_TCE_REMOVE, &remove); + return -EINVAL; + } + trace_vfio_spapr_create_window(create.page_shift, + create.window_size, + create.start_addr); + *pgsize = pagesize; + + return 0; +} + +int vfio_spapr_remove_window(VFIOContainer *container, + hwaddr offset_within_address_space) +{ + struct vfio_iommu_spapr_tce_remove remove = { + .argsz = sizeof(remove), + .start_addr = offset_within_address_space, + }; + int ret; + + ret = ioctl(container->fd, VFIO_IOMMU_SPAPR_TCE_REMOVE, &remove); + if (ret) { + error_report("Failed to remove window at %"PRIx64, + remove.start_addr); + return -errno; + } + + trace_vfio_spapr_remove_window(offset_within_address_space); + + return 0; +} diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h index b1f3e92..07f7188 100644 --- a/include/hw/vfio/vfio-common.h +++ b/include/hw/vfio/vfio-common.h @@ -168,4 +168,10 @@ int vfio_get_dev_region_info(VFIODevice *vbasedev, uint32_t type, #endif extern const MemoryListener vfio_prereg_listener; +int vfio_spapr_create_window(VFIOContainer *container, + MemoryRegionSection *section, + hwaddr *pgsize); +int vfio_spapr_remove_window(VFIOContainer *container, + hwaddr offset_within_address_space); + #endif /* !HW_VFIO_VFIO_COMMON_H */ diff --git a/trace-events b/trace-events index 0b1583f..7e94d92 100644 --- a/trace-events +++ b/trace-events @@ -1775,6 +1775,8 @@ vfio_prereg_listener_region_add_skip(uint64_t start, uint64_t end) "SKIPPING reg vfio_prereg_listener_region_del_skip(uint64_t start, uint64_t end) "SKIPPING region_del %"PRIx64" - %"PRIx64 vfio_prereg_register(uint64_t va, uint64_t size, int ret) "va=%"PRIx64" size=%"PRIx64" ret=%d" vfio_prereg_unregister(uint64_t va, uint64_t size, int ret) "va=%"PRIx64" size=%"PRIx64" ret=%d" +vfio_spapr_create_window(int ps, uint64_t ws, uint64_t off) "pageshift=0x%x winsize=0x%"PRIx64" offset=0x%"PRIx64 +vfio_spapr_remove_window(uint64_t off) "offset=%"PRIx64 # hw/vfio/platform.c vfio_platform_base_device_init(char *name, int groupid) "%s belongs to group #%d"
New VFIO_SPAPR_TCE_v2_IOMMU type supports dynamic DMA window management. This adds ability to VFIO common code to dynamically allocate/remove DMA windows in the host kernel when new VFIO container is added/removed. This adds a helper to vfio_listener_region_add which makes VFIO_IOMMU_SPAPR_TCE_CREATE ioctl and adds just created IOMMU into the host IOMMU list; the opposite action is taken in vfio_listener_region_del. When creating a new window, this uses heuristic to decide on the TCE table levels number. This should cause no guest visible change in behavior. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> --- Changes: v18: * moved trace definitions under hw/vfio/spapr.c section * moved trace_vfio_spapr_remove_window to vfio_spapr_remove_window() * vfio_host_win_del() now checks for exact window size * one ctz() less in vfio_spapr_create_window() v17: * moved spapr window create/remove helpers to separate file * added hw_error() if vfio_host_win_del() failed v16: * used memory_region_iommu_get_page_sizes() in vfio_listener_region_add() * enforced no intersections between windows v14: * new to the series --- hw/vfio/common.c | 79 +++++++++++++++++++++++++++++++++++++------ hw/vfio/spapr.c | 71 ++++++++++++++++++++++++++++++++++++++ include/hw/vfio/vfio-common.h | 6 ++++ trace-events | 2 ++ 4 files changed, 148 insertions(+), 10 deletions(-)