Re: [Xen-devel] sleep function in Xen
So sorry for that. On 2015年08月21日 18:09, Jan Beulich wrote: On 21.08.15 at 09:07, wrote: First of all - please don't cross post; removing xen-users. I want to read memory in Xen interval will the guest OS run normally. I didn't find sleep function in xen source and the delay function will crack the system. And I think the delay function will also stop the guest OS. Does anyone have any idea of which function I should use ? You should set up a timer. Jan ___ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
[Xen-devel] sleep function in Xen
Hi all, I want to read memory in Xen interval will the guest OS run normally. I didn't find sleep function in xen source and the delay function will crack the system. And I think the delay function will also stop the guest OS. Does anyone have any idea of which function I should use ? Thanks and best regards! xinyue ___ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
Re: [Xen-devel] Performance problem about address translation
On 2015年07月08日 14:26, xinyue wrote: Very sorry for sending wrong before. On 2015年07月08日 14:13, xinyue wrote: On 2015年07月07日 19:49, Ian Campbell wrote: On Tue, 2015-07-07 at 11:24 +0800, xinyue wrote: Please don't use HTML mail and do proper ">" quoting And after analyzing the performance of hvm domu, I found a process named "evolution-data-" using almost 99.9% cpu. Does someone known what's this and why it appears? evolution-data-server is part of the evolution mail client. It has nothing to do with Xen I'm afraid so you will have to look elsewhere for why it is taking so much CPU. Ian. Sorry for that and thanks very much. I think the problem maybe caused by the address alignment. The HVM DomU crashed after the hypercall and Dom0 crashed later sometimes with "Bus error". I think the function that caused the crash is get_gfn. The related code is unsigned long gfn; unsigned long mfn; struct vcpu *vcpu = current; struct domain *d = vcpu->domain; uint32_t pfec = PFEC_page_present; p2m_type_t t; gfn = paging_gva_to_gfn(current, 0xc029, &pfec); mfn = get_gfn(d, gfn, &t); Is that I lost some type translation? Thanks and best regards! xinyue Thanks for all advices, I found the problem appeared because I forget adding function put_gfn. Thanks again and best regards! xinyue ___ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
Re: [Xen-devel] Performance problem about address translation
Very sorry for sending wrong before. On 2015年07月08日 14:13, xinyue wrote: On 2015年07月07日 19:49, Ian Campbell wrote: On Tue, 2015-07-07 at 11:24 +0800, xinyue wrote: Please don't use HTML mail and do proper ">" quoting And after analyzing the performance of hvm domu, I found a process named "evolution-data-" using almost 99.9% cpu. Does someone known what's this and why it appears? evolution-data-server is part of the evolution mail client. It has nothing to do with Xen I'm afraid so you will have to look elsewhere for why it is taking so much CPU. Ian. Sorry for that and thanks very much. I think the problem maybe caused by the address alignment. The HVM DomU crashed after the hypercall and Dom0 crashed later sometimes with "Bus error". I think the function that caused the crash is get_gfn. The related code is unsigned long gfn; unsigned long mfn; struct vcpu *vcpu = current; struct domain *d = vcpu->domain; uint32_t pfec = PFEC_page_present; p2m_type_t t; gfn = paging_gva_to_gfn(current, 0xc029, &pfec); mfn = get_gfn(d, gfn, &t); Is that I lost some type translation? Thanks and best regards! xinyue ___ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
Re: [Xen-devel] Performance problem about address translation
On 2015年07月07日 19:49, Ian Campbell wrote: On Tue, 2015-07-07 at 11:24 +0800, xinyue wrote: Please don't use HTML mail and do proper ">" quoting And after analyzing the performance of hvm domu, I found a process named "evolution-data-" using almost 99.9% cpu. Does someone known what's this and why it appears? evolution-data-server is part of the evolution mail client. It has nothing to do with Xen I'm afraid so you will have to look elsewhere for why it is taking so much CPU. Ian. Sorry for that and thanks very much. I think the problem maybe caused by the address ___ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
Re: [Xen-devel] Performance problem about address translation
在 2015-07-06, Mon, 16:11:02 ,Andrew Cooper 写到：
On 06/07/2015 08:58, xinyue wrote:
在 2015-07-06, Mon, 15:44:53 ,Andrew Cooper 写到：
On 06/07/2015 08:22, xinyue wrote:
Hi,
For I want
to translate the virtual address in HVM DomU to virtual address in Xen. But
when I use the function paging_gva_to_gfn and get_gfn, I can feel the
performance down quickly, the machine become very hot and then I have to force
the machine shutting down.
Your machine clearly isn't cooled
sufficiently, which is the first problem.
The codes I used as below:
uint32_t
pfec = PFEC_page_present;
unsigned
long gfn;
unsigned
long mfn;
unsigned
long virtaddr;
struct vcpu
*vcpu = current;
struct
domain *d = vcpu->domain;
p2m_type_t t;
gfn =
paging_gva_to_gfn(current, 0xc029, &pfec);
mfn =
get_gfn(d, gfn, &t);
virtaddr =
map_domain_page(mfn_x(mfn));
I also use the dbg_hvm_va2mfn
function in debug.c, performance problem still present.
Walking pagetables in software is slow.
There is no getting around this.
Your performance problems will be caused by
performing the operation far too often. You should find a way to reduce
this.
Thanks very much, I think I only do this for
just once. And after the thanslation is done, the performance is not turn to
normal. Does that mean that if I wait long enough it will recovery?
It almost certainly means you are not doing it just once like
you suppose.
~andrew
Yes, you are right. I added printk in
get_gfn and found it was call many times. I'll check why that happens.
Thanks a lot!
Sorry for mistaking it, the calls of these functions in log
appear before I invoke them. These functions that I invoked are through
hypercall in HVM DomU, through the log I think I invoked them only once. Maybe
the performance problem is caused by the parameters I used? Could you help me
the check if I used them unproperly as posted before.
Another question is when I add printk in paging_gva_to gfn
function, the performance alse down serioursly that it can't even boot hvm
domu successfully. I am wondering why.
Thanks again and best regards!
And after analyzing the performance of hvm domu, I found a
process named "evolution-data-" using almost 99.9% cpu. Does someone
known what's this and why it appears?
xinyue
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Re: [Xen-devel] Performance problem about address translation
在 2015-07-06, Mon, 16:11:02 ,Andrew Cooper 写到：
On 06/07/2015 08:58, xinyue wrote:
在 2015-07-06, Mon, 15:44:53 ,Andrew Cooper 写到：
On 06/07/2015 08:22, xinyue wrote:
Hi,
For I want to
translate the virtual address in HVM DomU to virtual address in Xen. But when I
use the function paging_gva_to_gfn and get_gfn, I can feel the performance down
quickly, the machine become very hot and then I have to force the machine
shutting down.
Your machine clearly isn't cooled sufficiently,
which is the first problem.
The codes I used as below:
uint32_t pfec =
PFEC_page_present;
unsigned long gfn;
unsigned long mfn;
unsigned long
virtaddr;
struct vcpu *vcpu =
current;
struct domain *d =
vcpu->domain;
p2m_type_t t;
gfn =
paging_gva_to_gfn(current, 0xc029, &pfec);
mfn = get_gfn(d,
gfn, &t);
virtaddr =
map_domain_page(mfn_x(mfn));
I also use the dbg_hvm_va2mfn function
in debug.c, performance problem still present.
Walking pagetables in software is slow. There is
no getting around this.
Your performance problems will be caused by performing
the operation far too often. You should find a way to reduce this.
Thanks very much, I think I only do this for just once.
And after the thanslation is done, the performance is not turn to normal. Does
that mean that if I wait long enough it will recovery?
It almost certainly means you are not doing it just once like you
suppose.
~andrew
Yes, you are right. I added printk in get_gfn and
found it was call many times. I'll check why that happens. Thanks a lot!
Sorry for mistaking it, the calls of these functions in log appear
before I invoke them. These functions that I invoked are through hypercall in
HVM DomU, through the log I think I invoked them only once. Maybe the
performance problem is caused by the parameters I used? Could you help me the
check if I used them unproperly as posted before.
Another question is when I add printk in paging_gva_to gfn function,
the performance alse down serioursly that it can't even boot hvm domu
successfully. I am wondering why.
Thanks again and best regards!
xinyue
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Re: [Xen-devel] Performance problem about address translation
在 2015-07-06, Mon, 16:11:02 ,Andrew Cooper 写到： On 06/07/2015 08:58, xinyue wrote: 在 2015-07-06, Mon, 15:44:53 ,Andrew Cooper 写到： On 06/07/2015 08:22, xinyue wrote: Hi, For I want to translate the virtual address in HVM DomU to virtual address in Xen. But when I use the function paging_gva_to_gfn and get_gfn, I can feel the performance down quickly, the machine become very hot and then I have to force the machine shutting down. Your machine clearly isn't cooled sufficiently, which is the first problem. The codes I used as below: uint32_t pfec = PFEC_page_present; unsigned long gfn; unsigned long mfn; unsigned long virtaddr; struct vcpu *vcpu = current; struct domain *d = vcpu->domain; gfn = paging_gva_to_gfn(current, 0xc029, &pfec); mfn = get_gfn(d, gfn, &t); virtaddr = map_domain_page(mfn_x(mfn)); I also use the dbg_hvm_va2mfn function in debug.c, performance problem still present. Walking pagetables in software is slow. There is no getting around this. Your performance problems will be caused by performing the operation far too often. You should find a way to reduce this. Thanks very much, I think I only do this for just once. And after the thanslation is done, the performance is not turn to normal. Does that mean that if I wait long enough it will recovery? It almost certainly means you are not doing it just once like you suppose. ~andrew Yes, you are right. I added printk in get_gfn and found it was call many times. I'll check why that happens. Thanks a lot! xinyue ___ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
Re: [Xen-devel] Performance problem about address translation
在 2015-07-06, Mon, 15:44:53 ,Andrew Cooper 写到： On 06/07/2015 08:22, xinyue wrote: Hi, For I want to translate the virtual address in HVM DomU to virtual address in Xen. But when I use the function paging_gva_to_gfn and get_gfn, I can feel the performance down quickly, the machine become very hot and then I have to force the machine shutting down. Your machine clearly isn't cooled sufficiently, which is the first problem. The codes I used as below: uint32_t pfec = PFEC_page_present; unsigned long gfn; unsigned long mfn; unsigned long virtaddr; struct vcpu *vcpu = current; struct domain *d = vcpu->domain; gfn = paging_gva_to_gfn(current, 0xc029, &pfec); mfn = get_gfn(d, gfn, &t); virtaddr = map_domain_page(mfn_x(mfn)); I also use the dbg_hvm_va2mfn function in debug.c, performance problem still present. Walking pagetables in software is slow. There is no getting around this. Your performance problems will be caused by performing the operation far too often. You should find a way to reduce this. Thanks very much, I think I only do this for just once. And after the thanslation is done, the performance is not turn to normal. Does that mean that if I wait long enough it will recovery? ~Andrew ___ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
[Xen-devel] Performance problem about address translation
Hi, For I want to translate the virtual address in HVM DomU to virtual address in Xen. But when I use the function paging_gva_to_gfn and get_gfn, I can feel the performance down quickly, the machine become very hot and then I have to force the machine shutting down. The codes I used as below: uint32_t pfec = PFEC_page_present; unsigned long gfn; unsigned long mfn; unsigned long virtaddr; struct vcpu *vcpu = current; struct domain *d = vcpu->domain; gfn = paging_gva_to_gfn(current, 0xc029, &pfec); mfn = get_gfn(d, gfn, &t); virtaddr = map_domain_page(mfn_x(mfn)); I also use the dbg_hvm_va2mfn function in debug.c, performance problem still present. I don't know why, could someone give me some advices. Thanks for any advice and best regards! xinyue ___ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
Re: [Xen-devel] [Xen-users] xen physical address（paddr）and machine address (maddr)
Sorry for the unproper behaviors. 2015-06-29, Mon, 20:57:41 ,Ian Campbell ： On Mon, 2015-06-29 at 18:35 +0800, xinyue wrote: Please don't top post. Please have another read of hte Etiquette section of http://wiki.xen.org/wiki/Asking_Xen_Devel_Questions . > Thanks very much，I think it‘s very helpful and I'll try it. > > Does "for an arbitrary guest page it is unlikely to be from the > xenheap" means that some guest pages can't be mapped to xen heap page? Any given page is either a domheap page or a xenheap page, so there is no mapping in the sense you seem to be thinking of. So , the domheap pages and xenheap pages are both controled by xen? The guest pages can be mapped to domheap pages and we can monitor these pages in xen hypervisor to see the content of guest pages? > And I wonder in HVM doms with EPT supported, is there any difference > if I won't monitor guest domains memory regions? I'm afraid I don't understand the question. And sorry for the type error.I mean in HVM doms with EPT supported, is there any difference if I want monitor guest domains memory regions in xen hypervisor? Maybe the functions which translate guest virtual address to xen virtual address. ___ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
Re: [Xen-devel] [Xen-users] xen physical address（paddr）and machine address (maddr)
Thanks very much，I think it‘s very helpful and I'll try it. Does "for an arbitrary guest page it is unlikely to be from the xenheap" means that some guest pages can't be mapped to xen heap page? And I wonder in HVM doms with EPT supported, is there any difference if I won't monitor guest domains memory regions? Thanks again and best regards! xinyue 在 2015-06-29, Mon, 16:21:53 ,Ian Campbell 写到： On Sun, 2015-06-28 at 13:13 +0800, xinyue wrote: Per http://wiki.xen.org/wiki/Asking_Xen_Devel_Questions#Observe_list_etiquette. please do not cross post. You question seems to be xen-development related, so I have put the other two to bcc. > I wan't to hash the kernel code segment of HVM DomU in Xen > hypervisor, so I have to transilate the virtral address in VM to the > virtral address in xen. Is there some easy ways ? You need to first translate the guest virtual address to a guest physical address and then to a machine address which you can then map in to Xen. I think you need paging_gva_to_gfn for the first step, then one of the get_gfn* functions, then map_domain_page. I don't know if there is a helper which will simplify all this. > I read the source code about memory in Xen and confuse the > relationship between the paddr and maddr. How does HVM with EPT > translate between them. Is paddr the same with virtral address in xen > heap? No. A paddr is a physical address, not a virtual one. The latest xen.git contains a comment in xen/include/xen/mm.h which describes the different types of memory. To get a Xen virtual address for a domheap page you need to use (un)map_domain_page on the underlying machine address (or struct page_info *) to create a temporary mapping. For xenheap pages you can use other mechanisms, but for an arbitrary guest page it is unlikely to be from the xenheap. > > > Thanks for any advices and with best regards! > > > xinyue > > > ___ > Xen-users mailing list > xen-us...@lists.xen.org > http://lists.xen.org/xen-users ___ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
[Xen-devel] xen physical address（paddr）and machine address (maddr)
Hi all,
I wan't to hash the kernel code
segment of HVM DomU in Xen hypervisor, so I have to transilate the virtral
address in VM to the virtral address in xen. Is there some easy ways ?
I read the source code about memory
in Xen and confuse the relationship between the paddr and maddr. How does HVM
with EPT translate between them. Is paddr the same with virtral address in xen
heap?
Thanks for any advices and with best regards!
xinyue
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[Xen-devel] xen physical address（paddr）and machine address (maddr)
Hi all, I wan't to hash the kernel code segment of HVM DomU in Xen hypervisor, so I have to transilate the virtral address in VM to the virtral address in xen. Is there some easy ways ? I read the source code about memory in Xen and confuse the relationship between the paddr and maddr. How does HVM with EPT translate between them. Is paddr the same with virtral address in xen heap? Thanks for any advices and with best regards! xinyue ___ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
