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Re: [libvirt] [PATCH] qemu: Check for ia64 kvm



On Thu, Jan 14, 2010 at 09:33:39AM +0800, Dustin Xiong wrote:
> 
> 
>  
> 
> > From: crobinso redhat com
> > To: libvirt-list redhat com
> > CC: x_k_123 hotmail com; crobinso redhat com
> > Subject: [PATCH] qemu: Check for ia64 kvm
> > Date: Wed, 13 Jan 2010 15:50:06 -0500
> > 
> > From: Dustin Xiong <x_k_123 hotmail com>
> > 
> > Ported to current code. Untested, but builds fine.
> > 
> > Signed-off-by: Cole Robinson <crobinso redhat com>
> > ---
> > src/qemu/qemu_conf.c | 7 +++++++
> > 1 files changed, 7 insertions(+), 0 deletions(-)
> > 
> > diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c
> > index d3da776..0d970d6 100644
> > --- a/src/qemu/qemu_conf.c
> > +++ b/src/qemu/qemu_conf.c
> > @@ -373,12 +373,19 @@ static const struct qemu_feature_flags const arch_info_x86_64_flags [] = {
> > { "apic", 1, 0 },
> > };
> > 
> > +static const struct qemu_feature_flags const arch_info_ia64_flags [] = {
> > + { "acpi", 1, 1 },
> > + { "apic", 1, 0 },
> > +};
> > +
> > /* The archicture tables for supported QEMU archs */
> > static const struct qemu_arch_info const arch_info_hvm[] = {
> > { "i686", 32, NULL, "/usr/bin/qemu",
> > "/usr/bin/qemu-system-x86_64", arch_info_i686_flags, 4 },
> > { "x86_64", 64, NULL, "/usr/bin/qemu-system-x86_64",
> > NULL, arch_info_x86_64_flags, 2 },
> > + { "itanium", 64, NULL, "/usr/bin/qemu-system-ia64",
> > + NULL, arch_info_ia64_flags, 2},
> > { "arm", 32, NULL, "/usr/bin/qemu-system-arm", NULL, NULL, 0 },
> > { "mips", 32, NULL, "/usr/bin/qemu-system-mips", NULL, NULL, 0 },
> > { "mipsel", 32, NULL, "/usr/bin/qemu-system-mipsel", NULL, NULL, 0 },
> > -- 
> > 1.6.5.2
> > 
> 
> 
> There another problem when you make the libvirt src on the arch of itanium, you need modify the function clone().
> 
>        On IA-64, a different system call is used:
> 
>        int __clone2(int (*fn)(void *),  void *child_stack_base,
>                     size_t stack_size, int flags, void *arg, ...
>                     /* pid_t *pid, struct user_desc *tls, pid_t *ctid */ );
> 
>        The  __clone2() system call operates in the same way as clone(), except
>        that child_stack_base points to the lowest address of the child's stack
>        area,  and  stack_size  specifies  the  size of the stack pointed to by
>        child_stack_base.
> 
> 
> The function clone() is used in /src/lxc_container.c.

Thanks for the info.  FYI, you can work around it with --without-lxc to disable
build of the LXC driver

Daniel
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