Yong LIU
2006-Feb-15 11:53 UTC
[Xen-devel] how to transfer virtual address into pyhsical address
I write a very simple module to test memory address translation.
When I install the module under xen 3.0, kernel panic. But when
I install it under xen3.0 & kernel 2.6.16-rc2, it can work well.
My question is: Is there a different way to translate virtual address
into physical address under Xen 3.0?
thanks for help.
dmesg information.
--------------------------------------------------------
hello: module license ''unspecified'' taints kernel.
Unable to handle kernel paging request at virtual address 3e0c5b0c
printing eip:
f483c023
*pde = ma 00000000 pa 55555000
Oops: 0000 [#1]
SMP
Modules linked in: hello iptable_filter ip_tables video thermal
processor fan button battery ac
CPU: 1
EIP: 0061:[<f483c023>] Tainted: P VLI
EFLAGS: 00010206 (2.6.12.6-xen0-smp)
EIP is at kvirt_to_pa+0x23/0x3c [hello]
eax: 7e0c5000 ebx: f22c3000 ecx: 00000b0c edx: 000003c8
esi: f2026000 edi: c0000000 ebp: f2026000 esp: f2027f90
ds: 007b es: 007b ss: 0069
Process insmod (pid: 4710, threadinfo=f2026000 task=f27c4520)
Stack: f483e01a f22c3000 f483c380 c013a1f8 c05a10a8 00000001 f483c380
0804a060
b7fb3ff4 b7fb5538 c0109021 0804a060 00000dda 0804a050 b7fb3ff4
b7fb5538
bffd6558 00000080 0000007b c010007b 00000080 b7f5667e 00000073
00010246
Call Trace:
[<f483e01a>] hello_init_module+0x1a/0x2d [hello]
[<c013a1f8>] sys_init_module+0x145/0x1e1
[<c0109021>] syscall_call+0x7/0xb
Code: Bad EIP value.
-------------------------------------------------------
here is the code.
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/pgtable.h>
#include <asm/page.h>
static void kvirt_to_pa(void *vaddr)
{
unsigned long addr=(unsigned long) vaddr;
unsigned long pte_value;
pgd_t *pgd=NULL;
pmd_t *pmd=NULL;
pte_t *pte=NULL;
pgd=pgd_offset_k(addr);
if(pgd_none(*pgd))
goto hello_failed;
pmd=pmd_offset(pgd, addr);
if(pmd_none(*pmd))
goto hello_failed;
pte=pte_offset_kernel(pmd, addr);
if(!pte_present(*pte))
goto hello_failed;
pte_value= pte_val(*pte) & PAGE_MASK | (addr & (PAGE_SIZE - 1));
return;
hello_failed:
printk(" failed\n");
return;
}
static int __init hello_init_module(void)
{
void * page=NULL;
page=__get_free_pages(GFP_KERNEL, 0);
kvirt_to_pa(page);
free_page(page);
return 1;
}
static void __exit hello_exit_module(void)
{
printk(" say bye\n");
return;
}
module_init(hello_init_module);
module_exit(hello_exit_module);
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Mathieu Ropert
2006-Feb-15 13:13 UTC
[Xen-devel] Re: how to transfer virtual address into pyhsical address
Yong LIU wrote:> I write a very simple module to test memory address translation. > When I install the module under xen 3.0, kernel panic. But when > I install it under xen3.0 & kernel 2.6.16-rc2, it can work well. > > My question is: Is there a different way to translate virtual address > into physical address under Xen 3.0? > thanks for help. > > dmesg information. > -------------------------------------------------------- > hello: module license ''unspecified'' taints kernel. > Unable to handle kernel paging request at virtual address 3e0c5b0c > printing eip: > f483c023 > *pde = ma 00000000 pa 55555000 > Oops: 0000 [#1] > SMP > Modules linked in: hello iptable_filter ip_tables video thermal > processor fan button battery ac > CPU: 1 > EIP: 0061:[<f483c023>] Tainted: P VLI > EFLAGS: 00010206 (2.6.12.6-xen0-smp) > EIP is at kvirt_to_pa+0x23/0x3c [hello] > eax: 7e0c5000 ebx: f22c3000 ecx: 00000b0c edx: 000003c8 > esi: f2026000 edi: c0000000 ebp: f2026000 esp: f2027f90 > ds: 007b es: 007b ss: 0069 > Process insmod (pid: 4710, threadinfo=f2026000 task=f27c4520) > Stack: f483e01a f22c3000 f483c380 c013a1f8 c05a10a8 00000001 f483c380 > 0804a060 > b7fb3ff4 b7fb5538 c0109021 0804a060 00000dda 0804a050 b7fb3ff4 > b7fb5538 > bffd6558 00000080 0000007b c010007b 00000080 b7f5667e 00000073 > 00010246 > Call Trace: > [<f483e01a>] hello_init_module+0x1a/0x2d [hello] > [<c013a1f8>] sys_init_module+0x145/0x1e1 > [<c0109021>] syscall_call+0x7/0xb > Code: Bad EIP value. > ------------------------------------------------------- > here is the code. > #include <linux/init.h> > #include <linux/kernel.h> > #include <linux/module.h> > > #include <asm/pgtable.h> > #include <asm/page.h> > > static void kvirt_to_pa(void *vaddr) > { > unsigned long addr=(unsigned long) vaddr; > unsigned long pte_value; > pgd_t *pgd=NULL; > pmd_t *pmd=NULL; > pte_t *pte=NULL; > > pgd=pgd_offset_k(addr); > if(pgd_none(*pgd)) > goto hello_failed; > pmd=pmd_offset(pgd, addr); > if(pmd_none(*pmd)) > goto hello_failed; > pte=pte_offset_kernel(pmd, addr); > if(!pte_present(*pte)) > goto hello_failed; > > pte_value= pte_val(*pte) & PAGE_MASK | (addr & (PAGE_SIZE - 1)); > return; > > hello_failed: > printk(" failed\n"); > return; > } > static int __init hello_init_module(void) > { > void * page=NULL; > page=__get_free_pages(GFP_KERNEL, 0); > kvirt_to_pa(page); > free_page(page); > return 1; > } > > > static void __exit hello_exit_module(void) > { > printk(" say bye\n"); > return; > } > module_init(hello_init_module); > module_exit(hello_exit_module);__alloc_pages() returns a pointer to a page struct, not the virtual address of the allocated page. You can''t use it directly like you do. If you want the virtual address, either use page_address(page) or try some get_*_page function directly instead of alloc_pages(). Regards, Mathieu _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Yong LIU
2006-Feb-15 16:55 UTC
Re: [Xen-devel] how to transfer virtual address into pyhsical address
You''r right. I forget ARCH=xen under 2.6.12.6, which is different from 2.6.16-rc2. I prepare to write a dma access. But it often makes kernel panic. It seems to get an error machine address. I have tried virt_to_bus. Himanshu Raj wrote:>Did you compile your module with ARCH=xen? virt_to_phys has completely different >implementation for ARCH xen vs regular i386? > >-Himanshu > >On Wed, Feb 15, 2006 at 12:53:31PM +0100, Yong LIU wrote: > > >>I write a very simple module to test memory address translation. >>When I install the module under xen 3.0, kernel panic. But when >>I install it under xen3.0 & kernel 2.6.16-rc2, it can work well. >> >>My question is: Is there a different way to translate virtual address >>into physical address under Xen 3.0? >>thanks for help. >> >>dmesg information. >>-------------------------------------------------------- >>hello: module license ''unspecified'' taints kernel. >>Unable to handle kernel paging request at virtual address 3e0c5b0c >> printing eip: >>f483c023 >>*pde = ma 00000000 pa 55555000 >>Oops: 0000 [#1] >>SMP >>Modules linked in: hello iptable_filter ip_tables video thermal >>processor fan button battery ac >>CPU: 1 >>EIP: 0061:[<f483c023>] Tainted: P VLI >>EFLAGS: 00010206 (2.6.12.6-xen0-smp) >>EIP is at kvirt_to_pa+0x23/0x3c [hello] >>eax: 7e0c5000 ebx: f22c3000 ecx: 00000b0c edx: 000003c8 >>esi: f2026000 edi: c0000000 ebp: f2026000 esp: f2027f90 >>ds: 007b es: 007b ss: 0069 >>Process insmod (pid: 4710, threadinfo=f2026000 task=f27c4520) >>Stack: f483e01a f22c3000 f483c380 c013a1f8 c05a10a8 00000001 f483c380 >>0804a060 >> b7fb3ff4 b7fb5538 c0109021 0804a060 00000dda 0804a050 b7fb3ff4 >>b7fb5538 >> bffd6558 00000080 0000007b c010007b 00000080 b7f5667e 00000073 >>00010246 >>Call Trace: >> [<f483e01a>] hello_init_module+0x1a/0x2d [hello] >> [<c013a1f8>] sys_init_module+0x145/0x1e1 >> [<c0109021>] syscall_call+0x7/0xb >>Code: Bad EIP value. >>------------------------------------------------------- >>here is the code. >>#include <linux/init.h> >>#include <linux/kernel.h> >>#include <linux/module.h> >> >>#include <asm/pgtable.h> >>#include <asm/page.h> >> >>static void kvirt_to_pa(void *vaddr) >>{ >> unsigned long addr=(unsigned long) vaddr; >> unsigned long pte_value; >> pgd_t *pgd=NULL; >> pmd_t *pmd=NULL; >> pte_t *pte=NULL; >> >> pgd=pgd_offset_k(addr); >> if(pgd_none(*pgd)) >> goto hello_failed; >> pmd=pmd_offset(pgd, addr); >> if(pmd_none(*pmd)) >> goto hello_failed; >> pte=pte_offset_kernel(pmd, addr); >> if(!pte_present(*pte)) >> goto hello_failed; >> >> pte_value= pte_val(*pte) & PAGE_MASK | (addr & (PAGE_SIZE - 1)); >> return; >> >>hello_failed: >> printk(" failed\n"); >> return; >>} >>static int __init hello_init_module(void) >>{ >> void * page=NULL; >> page=__get_free_pages(GFP_KERNEL, 0); >> kvirt_to_pa(page); >> free_page(page); >> return 1; >>} >> >> >>static void __exit hello_exit_module(void) >>{ >> printk(" say bye\n"); >> return; >>} >>module_init(hello_init_module); >>module_exit(hello_exit_module); >> >> >> >>_______________________________________________ >>Xen-devel mailing list >>Xen-devel@lists.xensource.com >>http://lists.xensource.com/xen-devel >> >> > > >_______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Himanshu Raj
2006-Feb-16 00:13 UTC
Re: [Xen-devel] Re: how to transfer virtual address into pyhsical address
Related to this, can you tell me whether the memory allocated to a domain is contiguous in machine RAM (given the calls to xen_create_contiguous, seems like it is not)? Thanks, Himanshu On Wed, Feb 15, 2006 at 02:13:52PM +0100, Mathieu Ropert wrote:> Yong LIU wrote: > >I write a very simple module to test memory address translation. > >When I install the module under xen 3.0, kernel panic. But when > >I install it under xen3.0 & kernel 2.6.16-rc2, it can work well. > > > >My question is: Is there a different way to translate virtual address > >into physical address under Xen 3.0? > >thanks for help. > > > >dmesg information. > >-------------------------------------------------------- > >hello: module license ''unspecified'' taints kernel. > >Unable to handle kernel paging request at virtual address 3e0c5b0c > > printing eip: > >f483c023 > >*pde = ma 00000000 pa 55555000 > >Oops: 0000 [#1] > >SMP > >Modules linked in: hello iptable_filter ip_tables video thermal > >processor fan button battery ac > >CPU: 1 > >EIP: 0061:[<f483c023>] Tainted: P VLI > >EFLAGS: 00010206 (2.6.12.6-xen0-smp) > >EIP is at kvirt_to_pa+0x23/0x3c [hello] > >eax: 7e0c5000 ebx: f22c3000 ecx: 00000b0c edx: 000003c8 > >esi: f2026000 edi: c0000000 ebp: f2026000 esp: f2027f90 > >ds: 007b es: 007b ss: 0069 > >Process insmod (pid: 4710, threadinfo=f2026000 task=f27c4520) > >Stack: f483e01a f22c3000 f483c380 c013a1f8 c05a10a8 00000001 f483c380 > >0804a060 > > b7fb3ff4 b7fb5538 c0109021 0804a060 00000dda 0804a050 b7fb3ff4 > >b7fb5538 > > bffd6558 00000080 0000007b c010007b 00000080 b7f5667e 00000073 > >00010246 > >Call Trace: > > [<f483e01a>] hello_init_module+0x1a/0x2d [hello] > > [<c013a1f8>] sys_init_module+0x145/0x1e1 > > [<c0109021>] syscall_call+0x7/0xb > >Code: Bad EIP value. > >------------------------------------------------------- > >here is the code. > >#include <linux/init.h> > >#include <linux/kernel.h> > >#include <linux/module.h> > > > >#include <asm/pgtable.h> > >#include <asm/page.h> > > > >static void kvirt_to_pa(void *vaddr) > >{ > > unsigned long addr=(unsigned long) vaddr; > > unsigned long pte_value; > > pgd_t *pgd=NULL; > > pmd_t *pmd=NULL; > > pte_t *pte=NULL; > > > > pgd=pgd_offset_k(addr); > > if(pgd_none(*pgd)) > > goto hello_failed; > > pmd=pmd_offset(pgd, addr); > > if(pmd_none(*pmd)) > > goto hello_failed; > > pte=pte_offset_kernel(pmd, addr); > > if(!pte_present(*pte)) > > goto hello_failed; > > > > pte_value= pte_val(*pte) & PAGE_MASK | (addr & (PAGE_SIZE - 1)); > > return; > > > >hello_failed: > > printk(" failed\n"); > > return; > >} > >static int __init hello_init_module(void) > >{ > > void * page=NULL; > > page=__get_free_pages(GFP_KERNEL, 0); > > kvirt_to_pa(page); > > free_page(page); > > return 1; > >} > > > > > >static void __exit hello_exit_module(void) > >{ > > printk(" say bye\n"); > > return; > >} > >module_init(hello_init_module); > >module_exit(hello_exit_module); > > __alloc_pages() returns a pointer to a page struct, not the virtual > address of the allocated page. You can''t use it directly like you do. > If you want the virtual address, either use page_address(page) or try > some get_*_page function directly instead of alloc_pages(). > > Regards, > Mathieu > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel-- ------------------------------------------------------------------------- Himanshu Raj PhD Student, GaTech (www.cc.gatech.edu/~rhim) I prefer to receive attachments in an open, non-proprietary format. ------------------------------------------------------------------------- _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Yong LIU
2006-Feb-16 08:30 UTC
[Xen-devel] Re: how to transfer virtual address into pyhsical address
I use get_free_pages to get a contiguous virtual space, then get physical address for DMA with virt_to_bus. Regards Yong.> Related to this, can you tell me whether the memory allocated to a domain is > contiguous in machine RAM (given the calls to xen_create_contiguous, seems > like it is not)? > > Thanks, > Himanshu > > On Wed, Feb 15, 2006 at 02:13:52PM +0100, Mathieu Ropert wrote: > > Yong LIU wrote: > > >I write a very simple module to test memory address translation. > > >When I install the module under xen 3.0, kernel panic. But when > > >I install it under xen3.0 & kernel 2.6.16-rc2, it can work well. > > > > > >My question is: Is there a different way to translate virtual address > > >into physical address under Xen 3.0? > > >thanks for help. > > > > > >dmesg information. > > >-------------------------------------------------------- > > >hello: module license ''unspecified'' taints kernel. > > >Unable to handle kernel paging request at virtual address 3e0c5b0c > > > printing eip: > > >f483c023 > > >*pde = ma 00000000 pa 55555000 > > >Oops: 0000 [#1] > > >SMP > > >Modules linked in: hello iptable_filter ip_tables video thermal > > >processor fan button battery ac > > >CPU: 1 > > >EIP: 0061:[<f483c023>] Tainted: P VLI > > >EFLAGS: 00010206 (2.6.12.6-xen0-smp) > > >EIP is at kvirt_to_pa+0x23/0x3c [hello] > > >eax: 7e0c5000 ebx: f22c3000 ecx: 00000b0c edx: 000003c8 > > >esi: f2026000 edi: c0000000 ebp: f2026000 esp: f2027f90 > > >ds: 007b es: 007b ss: 0069 > > >Process insmod (pid: 4710, threadinfo=f2026000 task=f27c4520) > > >Stack: f483e01a f22c3000 f483c380 c013a1f8 c05a10a8 00000001 f483c380 > > >0804a060 > > > b7fb3ff4 b7fb5538 c0109021 0804a060 00000dda 0804a050 b7fb3ff4 > > >b7fb5538 > > > bffd6558 00000080 0000007b c010007b 00000080 b7f5667e 00000073 > > >00010246 > > >Call Trace: > > > [<f483e01a>] hello_init_module+0x1a/0x2d [hello] > > > [<c013a1f8>] sys_init_module+0x145/0x1e1 > > > [<c0109021>] syscall_call+0x7/0xb > > >Code: Bad EIP value. > > >------------------------------------------------------- > > >here is the code. > > >#include <linux/init.h> > > >#include <linux/kernel.h> > > >#include <linux/module.h> > > > > > >#include <asm/pgtable.h> > > >#include <asm/page.h> > > > > > >static void kvirt_to_pa(void *vaddr) > > >{ > > > unsigned long addr=(unsigned long) vaddr; > > > unsigned long pte_value; > > > pgd_t *pgd=NULL; > > > pmd_t *pmd=NULL; > > > pte_t *pte=NULL; > > > > > > pgd=pgd_offset_k(addr); > > > if(pgd_none(*pgd)) > > > goto hello_failed; > > > pmd=pmd_offset(pgd, addr); > > > if(pmd_none(*pmd)) > > > goto hello_failed; > > > pte=pte_offset_kernel(pmd, addr); > > > if(!pte_present(*pte)) > > > goto hello_failed; > > > > > > pte_value= pte_val(*pte) & PAGE_MASK | (addr & (PAGE_SIZE - 1)); > > > return; > > > > > >hello_failed: > > > printk(" failed\n"); > > > return; > > >} > > >static int __init hello_init_module(void) > > >{ > > > void * page=NULL; > > > page=__get_free_pages(GFP_KERNEL, 0); > > > kvirt_to_pa(page); > > > free_page(page); > > > return 1; > > >} > > > > > > > > >static void __exit hello_exit_module(void) > > >{ > > > printk(" say bye\n"); > > > return; > > >} > > >module_init(hello_init_module); > > >module_exit(hello_exit_module); > > > > __alloc_pages() returns a pointer to a page struct, not the virtual > > address of the allocated page. You can''t use it directly like you do. > > If you want the virtual address, either use page_address(page) or try > > some get_*_page function directly instead of alloc_pages(). > > > > Regards, > > Mathieu_______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel