[Xen-devel] How do I print all hypercalls as they come in?
Hello, I am trying to compile a xen build that will simply print all the hypercalls as they come into the hypervisor. Specifically, I'm looking for the hypercall handler function so that I can insert a simple printk statement. I'm having trouble because I can't find a doc that describes what most of the modules found in xen/arch/x86 and x86_64 do...am I right in thinking that the do_platform_op function in platform_hypercall.c serves as the entry point for all hypercalls? Thank You, -- D'Mita Levy Cyber Fellow, Applied Research Center Florida International University ___ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
Re: [Xen-devel] How do I print all hypercalls as they come in?
Andrew, Thanks for your help. I am trying to log the following hypercalls to dmesg as they come in: -HYPERVISOR_grant_table_op() - HYPERVISOR_mmu_update() - HYPERVISOR_set_trap_table() Are there single handlers for these as well? Thanks, On Thu, Feb 5, 2015 at 4:20 PM, Andrew Cooper wrote: > On 05/02/15 21:16, D'Mita Levy wrote: > > Hello, > > I am trying to compile a xen build that will simply print all the > hypercalls as they come into the hypervisor. Specifically, I'm looking for > the hypercall handler function so that I can insert a simple printk > statement. > > > The logging rate will easily overwhelm your serial connection. What is > the actual piece of information you are after? > > I'm having trouble because I can't find a doc that describes what most > of the modules found in xen/arch/x86 and x86_64 do...am I right in thinking > that the do_platform_op function in platform_hypercall.c serves as the > entry point for all hypercalls? > > > do_platform_op() is the handler for __HYPERCALL_platform_op which is one > single hypercall. > > The actual hypercall root handler is the 'hypercall' symbol in > arch/x86/x86_64/entry.S > > ~Andrew > -- D'Mita Levy Cyber Fellow, Applied Research Center Florida International University ___ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
Re: [Xen-devel] How do I print all hypercalls as they come in?
Andrew,
My apologies if my logic is flawed or what I am describing is convoluted -
I am a student doing research into Xen and trying my best to grasp what is
going on, also my ASM is subpar. I have read a paper on system call
interception (
https://hal.inria.fr/inria-00431031/PDF/Technical_Report_Syscall_Interception.pdf
) - page 10 describes disabling fast system calls by commenting out some
code in the do_set_trap_table() function and logging the calls along with
other guest info. My concern is that this may be a dated methodology as the
paper was written in 2009 but also that this will only work for x86 and not
x86_64 systems; including possible loss of performance since fast calls
tend to run better on x86 series processor systems. My goal is to identify
when a guest makes a hypercall requesting HYPERVISOR_..grant_table_op(),
mmu_update(), set_trap_table(), essentially I would love to be able to
say...if trapcode = xxx printk("Hypercall xxx\n") has occurred but I am
unsure what would be a good route to do something like that.
Thanks,
D'Mita
On Fri, Feb 6, 2015 at 10:23 AM, Andrew Cooper
wrote:
> On 06/02/15 15:17, D'Mita Levy wrote:
>
> Andrew,
>
> Thanks for your help. I am trying to log the following hypercalls to
> dmesg as they come in:
>
> -HYPERVISOR_grant_table_op()
>
> - HYPERVISOR_mmu_update()
>
> - HYPERVISOR_set_trap_table()
>
> Are there single handlers for these as well?
>
>
> The hypercall_table in arch/x86/x86_64/entry.S is the function pointer
> dispatch table, and is indexed by hypercall number.
>
> ~Andrew
>
--
D'Mita Levy
Cyber Fellow, Applied Research Center
Florida International University
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[Xen-devel] How can I modify and test Xentrace
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[Xen-devel] What is the correct way to enable the Base repositories on XenServer Dundee?
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Re: [Xen-devel] What is the correct way to enable the Base repositories on XenServer Dundee?
On Tue, Oct 27, 2015 at 11:02 AM, D'Mita Levy wrote: > Im trying to enable the yum repos on XenServer Dundee so I can install a > few packages (git, make, dev stuff etc) and do some experimental > development. > > I have enabled the base repository as such > > CentOS-7.0.1406.el7.centos.2.5 Base enabled: 0 > CentOS-7 - Debuginfodisabled > > [base] > name=CentOS-$releasever - Base > #baseurl= > http://www.uk.xensource.com/linux/distros/CentOS/7.0.1406/os/x86_64/ > mirrorlist= > http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra > #baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/ > exclude=kernel kernel-abi-whitelists kernel-debug kernel-debug-devel > kernel-devel kernel-doc kernel-tools kernel-tools-libs > kernel-tools-libs-devel linux-firmware biosdevname centos-release systemd* > stunnel kexec-tools > gpgcheck=1 > enabled=1 > gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7 > > But I get the following error: > > #yum update > Cannot find a valid baseurl for repo: base/7.0.1406.el7.centos.2.5/x86_64 > > My linux is mediocre at best...does anyone know how to enable the base > repository correctly? > > Thanks, > D'Mita > > -- > D'Mita Levy > Cyber Fellow, Applied Research Center > Florida International University > > Please remove this...I sent it to the wrong mailing list... -- D'Mita Levy Cyber Fellow, Applied Research Center Florida International University ___ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
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