search for: xc_map_foreign_rang

I am using Xen 3.0.4 vmx (on Intel VT). I need to map in a foreign page, given its mfn (not gpfn), into dom0. I used to do this quite well with Xen 3.0.2. However, when I ported my code to Xen 3.0.4, things seem to have changed. Does xc_map_foreign_range accept an mfn or a gpfn as its argument? It seems to be accepting gpfn in 3.0.4. Is that true? If so, can anyone please suggest a way for me to map in a foreign page, given its mfn, on to dom0? The reason I need to be able to do this is that I have allocated some machine pages inside Xen (thr...

I am shame to say that I have never met a function whose return value is void*. This is the first time~~~ So, can anyone told me the meaning of the return value of this function -----xc_map_foreign_range? Is it a pointer pointed to a memory area corresponding the machine frame number(the last parameter passed to the function)? And the third parameter named size: the unit of size is in bytes or in pages? Wish you good luck~~~ yours:Lin ______...

On Thu, 2005-06-16 at 06:17 +0100, Keir Fraser wrote: > > I suggested that we simply mmap /dev/kmem for the xenstored to access > > the domain0 page for the moment. That doesn''t work: we''ll do something > > else. > > Just use xc_map_foreign_range(), as you would for mapping any other > domain''s xenstore page. So here''s my patch against latest bk, including test program but we have an issue. On unmap, I hit the BUG_ON() on mm/rmap.c:482. Is this some issue with using xc_map_foreign_range() on non-foreign pages? Rus...

...(dom); + + if (!dom->interface && xcg_handle) { + /* Prefer using grant table */ + dom->interface = xc_gnttab_map_grant_ref(xcg_handle, + dom->domid, GNTTAB_RESERVED_CONSOLE, + PROT_READ|PROT_WRITE); + dom->ring_ref = -1; + } + if (!dom->interface) { + /* Fall back to xc_map_foreign_range */ dom->interface = xc_map_foreign_range( xc, dom->domid, getpagesize(), PROT_READ|PROT_WRITE, @@ -720,9 +744,7 @@ static void shutdown_domain(struct domain *d) { d->is_dead = true; watch_domain(d, false); - if (d->interface != NULL) - munmap(d->interface, getpagesi...

Hi: I wanna write code about sharing memory between dom0 and domU, and I decide to use void *xc_map_foreign_range(int xc_handle, unint32_t dom, int size, int port, unsigned long mfn) (this is a function in xenctl.h). My question is : If I wanna map a range of memory in dom0 to domU, how can I　get the value of mfn? and I do not know the port here. Can anybody help me ? Thanks ....

Hi! On BSD, mmap()ing files works on on-disk files but not on pseudo filesystems like kernfs or procfs. Therefore, attached patch mmap()s anonymous memory. Linux equivalents are sysfs and procfs to above BSD''s pseudo-filesystems. On Linux, mmap is implemented for sysfs but it is questionable to me how write operations work since (most) files in sysfs have static content. So this patch

...(dom); + + if (!dom->interface && xcg_handle) { + /* Prefer using grant table */ + dom->interface = xc_gnttab_map_grant_ref(xcg_handle, + dom->domid, GNTTAB_RESERVED_CONSOLE, + PROT_READ|PROT_WRITE); + dom->ring_ref = -1; + } + if (!dom->interface) { + /* Fall back to xc_map_foreign_range */ dom->interface = xc_map_foreign_range( xc, dom->domid, getpagesize(), PROT_READ|PROT_WRITE, @@ -720,9 +743,7 @@ static void shutdown_domain(struct domain *d) { d->is_dead = true; watch_domain(d, false); - if (d->interface != NULL) - munmap(d->interface, getpagesi...

On 31.10.13 04:34, Miguel Clara wrote: > I was trying to get a core-dump for a domU with xl and got this error: > > # xl dump-core 20 test.core > Memory fault > > GDB shows this: > > a# gdb xl xl.core > GNU gdb (GDB) 7.3.1 > Copyright (C) 2011 Free Software Foundation, Inc. > License GPLv3+: GNU GPL version 3 or later<http://gnu.org/licenses/gpl.html> >

...allocated to the guest and am now trying to build its pagetable and after that copy the kernel to the right places. The problem is: Given a machine frame number from a memory frame of the guest, how do I conceptionally map this into dom0''s address space? I followed the code path from xc_map_foreign_range to some obscure pagetable updates in the Linux kernel, but am still unable to make heads or tails of it. Any help is appreciated. Regards, Julian _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel

...try to read and write puseud physical memory of domU from Dom0 with xenaccess(this is using libxc). #http://xenaccess.sourceforge.net/ With xenaccess, I''m succeeded read and writing almost of the memory. But It fail when I try to access head 1M region and some bit regions. To be precise, xc_map_foreign_range() of libxc returns error code. ** <javascript:goWordLink("to")> What''s allocated on head 1M region of domU? #and , Can I get a document about memory allocation of dom0 and DomU somewhere? regards. **************************************** HPCS lab 4th grade student of Co...

Hello~~~ I need to use some functions provided by xen, such as xc_vcpu_getcontext(), xc_map_foreign_ranger() and so on. I have find them in the /libxc/xc_domain.c~~~ But I don't know how to use them in my program. For example, if I need to use the function named printf(), I have to include the header file <stdio.h>~~~ Now, I want to use these functions provided by xen, which header files...

Hello~~~~ I have to use some special functions provided by xen, such as xc_vcpu_getcontext(),xc_map_foreign_range() and so on. I tried to find them in the Xen Interface Manuel, but failed. Does anyone know where they are? And another problem: In the Xen Interface Manuel(Appendix A), "xen/include/public/" has been mentioned many times.But I havn't found such a directory in my computer. I instal...

Hi, I looked at the function xc_translate_foreign_address(), and see that it walks the page table of the guest VM. So at best, it should return the pfn of the guest (?) We can see taht the Later part of the function is like this: ... if (pt_levels >= 3) mfn = (pte & L0_PAGETABLE_MASK_PAE) >> PAGE_SHIFT; else mfn = (pte & L0_PAGETABLE_MASK)

2011/7/19 Stefano Stabellini <stefano.stabellini@eu.citrix.com>: > CC''ing Tim and xen-devel > > On Mon, 18 Jul 2011, Jiageng Yu wrote: >> 2011/7/16 Stefano Stabellini <stefano.stabellini@eu.citrix.com>: >> > On Fri, 15 Jul 2011, Jiageng Yu wrote: >> >> 2011/7/15 Jiageng Yu <yujiageng734@gmail.com>: >> >> > 2011/7/15

.../ + for ( count = 0; count < nr_pages; count++ ) + { + if ( add_mmu_update(xc_handle, mmu, + (page_array[count] << PAGE_SHIFT) | + MMU_MACHPHYS_UPDATE, count) ) + goto error_out; + } + + if ((boot_paramsp = xc_map_foreign_range( xc_handle, dom, PAGE_SIZE, PROT_READ|PROT_WRITE, page_array[(vboot_params_start-dsi.v_start)>>PAGE_SHIFT])) == 0) _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel

...g when destroyed the VMX. page_remove_rmap() BUG on page->_mapcount when QEMU exited. I try to solve this problem but I''m not familiar with MM code. So I wanna ask you guys several questions and hope you can give some clues: 1)If we map a foreign page(DomainU or VMX) to Domain0 through xc_map_foreign_range, the pfn(in Domain0''s memory space)which points to the mapped mfn should not correlate with any page structure. Is it right? I suppose it to be true. The question is when the kernel calls unmap_page_range, it should try to call vm_normal_page on the related pte to get the page struct...

...if (!paging_enabled(&ctxt[cpu])) { static void * v; - unsigned long page; + uint64_t page; if ( v != NULL ) munmap(v, PAGE_SIZE); - page = to_ma(cpu, page_array[va >> PAGE_SHIFT]); + page = to_ma(cpu, va); v = xc_map_foreign_range( xc_handle, current_domid, PAGE_SIZE, perm, page >> PAGE_SHIFT); _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel

...AX_CMDLINE-1] = ''\0''; munmap(start_info, PAGE_SIZE); + /* Tell our caller where we told domain store page was. */ + *store_mfn = page_array[((vstartinfo_start-dsi.v_start)>>PAGE_SHIFT) + 1]; + /* shared_info page starts its life empty. */ shared_info = xc_map_foreign_range( xc_handle, dom, PAGE_SIZE, PROT_READ|PROT_WRITE, shared_info_frame); @@ -310,7 +319,9 @@ const char *cmdline, unsigned int control_evtchn, unsigned long flags, - unsigned int vcpus) + unsigned...

Hi, I had a problem trying to migrate domains, in trying to locate it I noticed that saving domains doesn''t work either, which I believe explains why the receiving xfrd doesn''t actually receive anything. So here it goes... xenone:/tmp# xm list Name Id Mem(MB) CPU State Time(s) Console Domain-0 0 123 0 r---- 900.6 sky 9

Where is the code that maps the kernel of a DomU into memory? i.e, when you do a xm create <config file> what code is called to actually map the kernel into memory? Is it a python script or is it re-directed to Dom0 to do? Thanks. -Brian --------------------------------- Ahhh...imagining that irresistible "new car" smell? Check outnew cars at Yahoo! Autos.