Hi， all In tools/libxc/xc_domain_save .c, one function called `map_and_save_p2m_table` where there exists a confusing problem, as is shown below: 621 live_p2m_frame_list 622 xc_map_foreign_batch(xc_handle, dom, PROT_READ, 623 p2m_frame_list_list, 624 P2M_FLL_ENTRIES); memcpy(p2m_frame_list, live_p2m_frame_list, P2M_GUEST_FL_SIZE); 654 p2m = xc_map_foreign_batch(xc_handle, dom, PROT_READ, 655 p2m_frame_list, 656 P2M_FL_ENTRIES); maybe someone encountered the same problem, would you help me? Besides, what''s the difference between IOCTL_PRIVCMD_MMAP and IOCTL_PRIVCMD_MMAPBATCH? Thanks bruce _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
On Sat, Sep 29, 2012 at 4:07 AM, 马磊 <aware.why@gmail.com> wrote:> Hi， all > In tools/libxc/xc_domain_save .c, one function called > `map_and_save_p2m_table` where there exists a confusing problem, as is shown > below: > > 621 live_p2m_frame_list > 622 xc_map_foreign_batch(xc_handle, dom, PROT_READ, > 623 p2m_frame_list_list, > 624 P2M_FLL_ENTRIES); > > memcpy(p2m_frame_list, live_p2m_frame_list, P2M_GUEST_FL_SIZE); > > 654 p2m = xc_map_foreign_batch(xc_handle, dom, PROT_READ, > 655 p2m_frame_list, > 656 P2M_FL_ENTRIES); > > > maybe someone encountered the same problem, would you help me?What's the problem?> Besides, what's the difference between IOCTL_PRIVCMD_MMAP and > IOCTL_PRIVCMD_MMAPBATCH?IOCTL_PRIVCMD_MMAP will only map a single page; MMAPBATCH will map an array of pages. (To "batch" something in computing means to do a bunch of things all together rather than doing them separately; e.g., rather than mapping each page with a separate ioctl, you "batch" them all together in one ioctl.) -George _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
On Mon, Oct 1, 2012 at 10:17 PM, George Dunlap <George.Dunlap@eu.citrix.com>wrote:> On Sat, Sep 29, 2012 at 4:07 AM, 马磊 <aware.why@gmail.com> wrote: > > Hi， all > > In tools/libxc/xc_domain_save .c, one function called > > `map_and_save_p2m_table` where there exists a confusing problem, as is > shown > > below: > > > > 621 live_p2m_frame_list > > 622 xc_map_foreign_batch(xc_handle, dom, PROT_READ, > > 623 p2m_frame_list_list, > > 624 P2M_FLL_ENTRIES); > > > > memcpy(p2m_frame_list, live_p2m_frame_list, P2M_GUEST_FL_SIZE); > > > > 654 p2m = xc_map_foreign_batch(xc_handle, dom, PROT_READ, > > 655 p2m_frame_list, > > 656 P2M_FL_ENTRIES); > > > > > > maybe someone encountered the same problem, would you help me? > > What''s the problem? > > > Besides, what''s the difference between IOCTL_PRIVCMD_MMAP and > > IOCTL_PRIVCMD_MMAPBATCH? > > IOCTL_PRIVCMD_MMAP will only map a single page; MMAPBATCH will map an > array of pages. > > (To "batch" something in computing means to do a bunch of things all > together rather than doing them separately; e.g., rather than mapping > each page with a separate ioctl, you "batch" them all together in one > ioctl.) > > -George >Thanks, yours makes me clear and confident. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel