[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] dm_op: Add xendevicemodel_modified_memory_bulk.
From: Jennifer Herbert <Jennifer.Herbert@xxxxxxxxxx> This new lib devicemodel call allows multiple extents of pages to be marked as modified in a single call. This is something needed for a usecase I'm working on. The xen side of the modified_memory call has been modified to accept an array of extents. The devicemodle library either provides an array of length 1, to support the original library function, or a second function allows an array to be provided. Signed-off-by: Jennifer Herbert <Jennifer.Herbert@xxxxxxxxxx> --- Cc: Jan Beulich <jbeulich@xxxxxxxx> Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx> Cc: Wei Liu <wei.liu2@xxxxxxxxxx> Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> Cc: Paul Durrant <paul.durrant@xxxxxxxxxx> --- tools/libs/devicemodel/core.c | 30 ++++-- tools/libs/devicemodel/include/xendevicemodel.h | 20 +++- xen/arch/x86/hvm/dm.c | 117 +++++++++++++++-------- xen/include/public/hvm/dm_op.h | 12 ++- 4 files changed, 125 insertions(+), 54 deletions(-) diff --git a/tools/libs/devicemodel/core.c b/tools/libs/devicemodel/core.c index a85cb49..1f7a9dc 100644 --- a/tools/libs/devicemodel/core.c +++ b/tools/libs/devicemodel/core.c @@ -434,22 +434,36 @@ int xendevicemodel_track_dirty_vram( dirty_bitmap, (size_t)(nr + 7) / 8); } -int xendevicemodel_modified_memory( - xendevicemodel_handle *dmod, domid_t domid, uint64_t first_pfn, - uint32_t nr) +int xendevicemodel_modified_memory_bulk( + xendevicemodel_handle *dmod, domid_t domid, + struct xen_dm_op_modified_memory_extent *extents, uint32_t nr) { struct xen_dm_op op; - struct xen_dm_op_modified_memory *data; + struct xen_dm_op_modified_memory *header; + size_t extents_size = nr * sizeof(struct xen_dm_op_modified_memory_extent); memset(&op, 0, sizeof(op)); op.op = XEN_DMOP_modified_memory; - data = &op.u.modified_memory; + header = &op.u.modified_memory; - data->first_pfn = first_pfn; - data->nr = nr; + header->nr_extents = nr; + header->offset = 0; - return xendevicemodel_op(dmod, domid, 1, &op, sizeof(op)); + return xendevicemodel_op(dmod, domid, 2, &op, sizeof(op), + extents, extents_size); +} + +int xendevicemodel_modified_memory( + xendevicemodel_handle *dmod, domid_t domid, uint64_t first_pfn, + uint32_t nr) +{ + struct xen_dm_op_modified_memory_extent extent; + + extent.first_pfn = first_pfn; + extent.nr = nr; + + return xendevicemodel_modified_memory_bulk(dmod, domid, &extent, 1); } int xendevicemodel_set_mem_type( diff --git a/tools/libs/devicemodel/include/xendevicemodel.h b/tools/libs/devicemodel/include/xendevicemodel.h index b3f600e..b88d73c 100644 --- a/tools/libs/devicemodel/include/xendevicemodel.h +++ b/tools/libs/devicemodel/include/xendevicemodel.h @@ -236,8 +236,8 @@ int xendevicemodel_track_dirty_vram( uint32_t nr, unsigned long *dirty_bitmap); /** - * This function notifies the hypervisor that a set of domain pages - * have been modified. + * This function notifies the hypervisor that a set of contiguous + * domain pages have been modified. * * @parm dmod a handle to an open devicemodel interface. * @parm domid the domain id to be serviced @@ -249,6 +249,22 @@ int xendevicemodel_modified_memory( xendevicemodel_handle *dmod, domid_t domid, uint64_t first_pfn, uint32_t nr); + +/** + * This function notifies the hypervisor that a set of discontiguous + * domain pages have been modified. + * + * @parm dmod a handle to an open devicemodel interface. + * @parm domid the domain id to be serviced + * @parm extents an array of extent structs, which each hold + a start_pfn and nr (number of pfns). + * @parm nr the number of extents in the array + * @return 0 on success, -1 on failure. + */ +int xendevicemodel_modified_memory_bulk( + xendevicemodel_handle *dmod, domid_t domid, + struct xen_dm_op_modified_memory_extent extents[], uint32_t nr); + /** * This function notifies the hypervisor that a set of domain pages * are to be treated in a specific way. (See the definition of diff --git a/xen/arch/x86/hvm/dm.c b/xen/arch/x86/hvm/dm.c index 2122c45..0c4a820 100644 --- a/xen/arch/x86/hvm/dm.c +++ b/xen/arch/x86/hvm/dm.c @@ -119,56 +119,96 @@ static int set_isa_irq_level(struct domain *d, uint8_t isa_irq, } static int modified_memory(struct domain *d, - struct xen_dm_op_modified_memory *data) + struct xen_dm_op_modified_memory *header, + xen_dm_op_buf_t* buf) { - xen_pfn_t last_pfn = data->first_pfn + data->nr - 1; - unsigned int iter = 0; - int rc = 0; + /* Process maximum of 255 pfns before checking for continuation */ + const uint32_t max_pfns = 0xff; - if ( (data->first_pfn > last_pfn) || - (last_pfn > domain_get_maximum_gpfn(d)) ) - return -EINVAL; + xen_pfn_t last_pfn; + int rc = 0; + uint32_t offset = header->offset; + unsigned long pfn; + unsigned long max_pfn; + unsigned max_nr; + uint32_t rem_pfns = max_pfns; if ( !paging_mode_log_dirty(d) ) return 0; - while ( iter < data->nr ) + if ( (buf->size / sizeof(struct xen_dm_op_modified_memory_extent)) < + header->nr_extents ) + return -EINVAL; + + while ( offset < header->nr_extents ) { - unsigned long pfn = data->first_pfn + iter; - struct page_info *page; + struct xen_dm_op_modified_memory_extent extent; - page = get_page_from_gfn(d, pfn, NULL, P2M_UNSHARE); - if ( page ) + if ( copy_from_guest_offset(&extent, buf->h, offset, 1) ) + return -EFAULT; + + last_pfn = extent.first_pfn + extent.nr - 1; + + if ( last_pfn > domain_get_maximum_gpfn(d) ) + return -EINVAL; + + if ( extent.nr > rem_pfns ) + max_nr = rem_pfns; + else { - mfn_t gmfn = _mfn(page_to_mfn(page)); - - paging_mark_dirty(d, gmfn); - /* - * These are most probably not page tables any more - * don't take a long time and don't die either. - */ - sh_remove_shadows(d, gmfn, 1, 0); - put_page(page); + max_nr = extent.nr; + offset++; } - iter++; + rem_pfns -= max_nr; + max_pfn = extent.first_pfn + max_nr; - /* - * Check for continuation every 256th iteration and if the - * iteration is not the last. - */ - if ( (iter < data->nr) && ((iter & 0xff) == 0) && - hypercall_preempt_check() ) + pfn = extent.first_pfn; + while ( pfn < max_pfn ) { - data->first_pfn += iter; - data->nr -= iter; + struct page_info *page; + page = get_page_from_gfn(d, pfn, NULL, P2M_UNSHARE); + + if ( page ) + { + mfn_t gmfn = _mfn(page_to_mfn(page)); + + paging_mark_dirty(d, gmfn); + /* + * These are most probably not page tables any more + * don't take a long time and don't die either. + */ + sh_remove_shadows(d, gmfn, 1, 0); + put_page(page); + } + pfn++; + } - rc = -ERESTART; - break; + if ( max_nr < extent.nr ) + { + extent.first_pfn += max_nr; + extent.nr-= max_nr; + if ( copy_to_guest_offset(buf->h, offset, &extent, 1) ) + return -EFAULT; } - } - return rc; + /* + * Check for continuation every 256th pfn and if the + * pfn is not the last. + */ + + if ( (rem_pfns == 0) && (offset <= header->nr_extents) ) + { + if ( hypercall_preempt_check() ) + { + header->offset = offset; + rc = -ERESTART; + break; + } + rem_pfns += max_pfns; + } + } + return rc; } static bool allow_p2m_type_change(p2m_type_t old, p2m_type_t new) @@ -441,13 +481,8 @@ static int dm_op(domid_t domid, struct xen_dm_op_modified_memory *data = &op.u.modified_memory; - const_op = false; - - rc = -EINVAL; - if ( data->pad ) - break; - - rc = modified_memory(d, data); + rc = modified_memory(d, data, &bufs[1]); + const_op = (rc != -ERESTART); break; } diff --git a/xen/include/public/hvm/dm_op.h b/xen/include/public/hvm/dm_op.h index f54cece..1c602b1 100644 --- a/xen/include/public/hvm/dm_op.h +++ b/xen/include/public/hvm/dm_op.h @@ -237,13 +237,19 @@ struct xen_dm_op_set_pci_link_route { * XEN_DMOP_modified_memory: Notify that a set of pages were modified by * an emulator. * - * NOTE: In the event of a continuation, the @first_pfn is set to the - * value of the pfn of the remaining set of pages and @nr reduced - * to the size of the remaining set. + * DMOP buf 1 contains an array of xen_dm_op_modified_memory_extent with + * nr_extent entries. + * + * On continuation, @offset is set to the next extent to be processed. */ #define XEN_DMOP_modified_memory 11 struct xen_dm_op_modified_memory { + uint32_t nr_extents; /* IN - number of extents. */ + uint32_t offset; /* Caller must set to 0. */ +}; + +struct xen_dm_op_modified_memory_extent { /* IN - number of contiguous pages modified */ uint32_t nr; uint32_t pad; -- 1.7.10.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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