Re: [Xen-devel] [PATCH]fix xen0 hang when start seconds vmx guest

["Ling, Xiaofeng" <xiaofeng.ling@xxxxxxxxx>]

Please ignore the previous patch,
We got a better patch.(see attach)
1:1 page table doesn't need to assign
to v->arch.guest_table, there is no shadow page for it.

Ling, Xiaofeng wrote:
> Attach patch can satisfy the audit.
> For vmx domain, we also call get_type.
>
> Ling, Xiaofeng wrote:
>
> > For vmx domain, because shadow_mode_reference is set later in
> > vmx_final_setup_guest, so in arch_set_info_guest, the phys_basetab
> > is not do get_page, while when destroying, put_page is called,
> > so there is one page, the count=-1, and when a new domain allocate
> > this page, it will take it as cpumask 0xffffffff, this cause 
> > flash_tlb_mask goes into dead loop.(How new bios/microcode can deal with
> > it? maybe some differnet in sending IPI?)
> > The warning:
> > (XEN) Audit 1: type count went below zero mfn=1e03d t=f0000000 ot=3654b
> > is also caused by this, for vmx domain, the page is net get_type.
> >
> > I think bug 128, 131, 351 are all caused by this issue.
> >
> > diff -r 07070a351156 -r 833b086cc0e8 xen/arch/x86/domain.c
> > --- a/xen/arch/x86/domain.c Thu Nov 10 12:18:23 2005 +0800
> > +++ b/xen/arch/x86/domain.c Thu Nov 10 14:05:11 2005 +0800
> > @@ -389,7 +389,12 @@
> >          if ( !get_page(&frame_table[phys_basetab>>PAGE_SHIFT], d) )
> >              return -EINVAL;
> >      }
> > -    else if ( !(c->flags & VGCF_VMX_GUEST) )
> > +    else if ( (c->flags & VGCF_VMX_GUEST) )
> > +    {
> > +        if ( !get_page(&frame_table[phys_basetab>>PAGE_SHIFT], d) )
> > +            return -EINVAL;
> > +    }
> > +    else
> >      {
> >          if ( 
> > !get_page_and_type(&frame_table[phys_basetab>>PAGE_SHIFT], d,
> >                                  PGT_base_page_table) )
> >
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
>
>
> ------------------------------------------------------------------------
>
> # HG changeset patch
> # User Xiaofeng Ling <xiaofeng.ling@xxxxxxxxx>
> # Node ID 833b086cc0e82af98fb5149cebfce08e5e65b4b1
> # Parent  07070a3511560287314082abf5f3514d4bfdd0dd
> For vmx domain, because shadow_mode_reference is set later in
> vmx_final_setup_guest, so in arch_set_info_guest, the phys_basetab
> is not do get_page, while when destroying, put_page is called,
> so there is one page, the count=-1, and when a new domain allocate
> this page, it will take it as cpumask 0xffffffff, this cause flash_tlb_mask
> goes into dead loop.
> This patch also eliminate the warning when creating vmx guest:
> (XEN) Audit 1: type count went below zero mfn=1e03d t=f0000000 ot=3654b
>
> Signed-off-by: Xiaofeng Ling <xiaofeng.ling@xxxxxxxxx>
>
> diff -r 07070a351156 xen/arch/x86/domain.c
> --- a/xen/arch/x86/domain.c     Thu Nov 10 12:18:23 2005 +0800
> +++ b/xen/arch/x86/domain.c     Thu Nov 10 15:36:29 2005 +0800
> @@ -389,7 +389,7 @@
>          if ( !get_page(&frame_table[phys_basetab>>PAGE_SHIFT], d) )
>              return -EINVAL;
>      }
> -    else if ( !(c->flags & VGCF_VMX_GUEST) )
> +    else
>      {
>          if ( !get_page_and_type(&frame_table[phys_basetab>>PAGE_SHIFT], d,
>                                  PGT_base_page_table) )
> @@ -962,7 +962,7 @@
>      {
>          if ( (pfn = pagetable_get_pfn(v->arch.guest_table)) != 0 )
>          {
> -            if ( !shadow_mode_refcounts(d) )
> +            if ( !shadow_mode_refcounts(d) || shadow_mode_external(d) )
>                  put_page_type(pfn_to_page(pfn));
>              put_page(pfn_to_page(pfn));
>  

# HG changeset patch
# User Xiaofeng Ling <xiaofeng.ling@xxxxxxxxx>
# Node ID 833b086cc0e82af98fb5149cebfce08e5e65b4b1
# Parent  07070a3511560287314082abf5f3514d4bfdd0dd
For vmx domain, because shadow_mode_reference is set later in
vmx_final_setup_guest, so in arch_set_info_guest, the phys_basetab
is not do get_page, while when destroying, put_page is called,
so there is one page, the count=-1, and when a new domain allocate
this page, it will take it as cpumask 0xffffffff, this cause flash_tlb_mask
goes into dead loop.
This patch also eliminate the warning when creating vmx guest:
(XEN) Audit 1: type count went below zero mfn=1e03d t=f0000000 ot=3654b

Signed-off-by: Xiaofeng Ling <xiaofeng.ling@xxxxxxxxx>
Signed-off-by: Xin Li        <xin.b.li@xxxxxxxxx>

diff -r 07070a351156 xen/arch/x86/domain.c
--- a/xen/arch/x86/domain.c     Thu Nov 10 12:18:23 2005 +0800
+++ b/xen/arch/x86/domain.c     Thu Nov 10 17:30:05 2005 +0800
@@ -407,6 +407,7 @@
         /* VMX uses the initially provided page tables as the P2M map. */
         if ( !pagetable_get_paddr(d->arch.phys_table) )
             d->arch.phys_table = v->arch.guest_table;
+        v->arch.guest_table = mk_pagetable(0);
 
         /* Initialize monitor page table */
         v->arch.monitor_table = mk_pagetable(0);
diff -r 07070a351156 xen/arch/x86/vmx.c
--- a/xen/arch/x86/vmx.c        Thu Nov 10 12:18:23 2005 +0800
+++ b/xen/arch/x86/vmx.c        Thu Nov 10 17:30:05 2005 +0800
diff -r 07070a351156 xen/arch/x86/vmx_vmcs.c
--- a/xen/arch/x86/vmx_vmcs.c   Thu Nov 10 12:18:23 2005 +0800
+++ b/xen/arch/x86/vmx_vmcs.c   Thu Nov 10 17:30:05 2005 +0800
@@ -332,7 +332,7 @@
     error |= __vmwrite(GUEST_TR_BASE, 0);
     error |= __vmwrite(GUEST_TR_LIMIT, 0xff);
 
-    __vmwrite(GUEST_CR3, pagetable_get_paddr(v->arch.guest_table));
+    __vmwrite(GUEST_CR3, pagetable_get_paddr(v->domain->arch.phys_table));
     __vmwrite(HOST_CR3, pagetable_get_paddr(v->arch.monitor_table));
     __vmwrite(HOST_RSP, (unsigned long)get_stack_bottom());
 

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