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Wei Wang2

2011-Apr-15 12:14 UTC

[Xen-devel] [PATCH V2 4/4] amd iommu: interfaces for p2m sharing

--
Advanced Micro Devices GmbH
Sitz: Dornach, Gemeinde Aschheim, 
Landkreis München Registergericht München, 
HRB Nr. 43632
WEEE-Reg-Nr: DE 12919551
Geschäftsführer:
Alberto Bozzo, Andrew Bowd


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Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel

Tim Deegan

2011-Apr-18 10:26 UTC

head link

[Xen-devel] Re: [PATCH V2 4/4] amd iommu: interfaces for p2m sharing

At 13:14 +0100 on 15 Apr (1302873244), Wei Wang2 wrote:> --
> Advanced Micro Devices GmbH
> Sitz: Dornach, Gemeinde Aschheim, 
> Landkreis München Registergericht München, 
> HRB Nr. 43632
> WEEE-Reg-Nr: DE 12919551
> Geschäftsführer:
> Alberto Bozzo, Andrew Bowd
> # HG changeset patch
> # User Wei Wang <wei.wang2@amd.com>
> # Node ID b5c197b1d2ac80881d0683cdadf12ac33b762614
> # Parent  1d9b0e45566ec3cd0e293212d9a454920116b2b1
> Add a generic interface for both vtd and amd iommu p2m sharing. Also
> introduce a new parameter (iommu=sharept) to enable this feature.
Why does this introduce a separate variable?  Surely "iommu=sharept"
should just set iommu_hap_pt_share directly.  Also, it looks like
"iommu=sharept" has different semantics on AMD and Intel machines
(i.e., it does nothing on Intel). Was that the intention?

The rest of this series looks OK to me.  Is it safe to apply the rest
without this patch or should I wait for the next version and apply them
all together?

Cheers,

Tim.
> Signed-off-by: Wei Wang <wei.wang2@amd.com>
> 
> diff -r 1d9b0e45566e -r b5c197b1d2ac xen/arch/x86/mm/p2m.c
> --- a/xen/arch/x86/mm/p2m.c	Fri Apr 15 12:10:39 2011 +0200
> +++ b/xen/arch/x86/mm/p2m.c	Fri Apr 15 12:13:24 2011 +0200
> @@ -2061,8 +2061,8 @@ int p2m_alloc_table(struct p2m_domain *p
>  
>      p2m->phys_table = pagetable_from_mfn(page_to_mfn(p2m_top));
>  
> -    if ( hap_enabled(d) && (boot_cpu_data.x86_vendor ==
X86_VENDOR_INTEL) )
> -        iommu_set_pgd(d);
> +    if ( hap_enabled(d) )
> +        iommu_share_p2m_table(d);
>  
>      P2M_PRINTK("populating p2m table\n");
>  
> diff -r 1d9b0e45566e -r b5c197b1d2ac
xen/drivers/passthrough/amd/iommu_map.c
> --- a/xen/drivers/passthrough/amd/iommu_map.c	Fri Apr 15 12:10:39 2011
+0200
> +++ b/xen/drivers/passthrough/amd/iommu_map.c	Fri Apr 15 12:13:24 2011
+0200
> @@ -716,6 +716,12 @@ void amd_iommu_share_p2m(struct domain *
>  
>      ASSERT( is_hvm_domain(d) && d->arch.hvm_domain.hap_enabled
);
>  
> +    if ( !iommu_sharept )
> +    {
> +        iommu_hap_pt_share = 0;
> +        return;
> +    }
> +
>      pgd_mfn = pagetable_get_mfn(p2m_get_pagetable(p2m_get_hostp2m(d)));
>      p2m_table = mfn_to_page(mfn_x(pgd_mfn));
>  
> diff -r 1d9b0e45566e -r b5c197b1d2ac
xen/drivers/passthrough/amd/pci_amd_iommu.c
> --- a/xen/drivers/passthrough/amd/pci_amd_iommu.c	Fri Apr 15 12:10:39 2011
+0200
> +++ b/xen/drivers/passthrough/amd/pci_amd_iommu.c	Fri Apr 15 12:13:24 2011
+0200
> @@ -458,4 +458,5 @@ const struct iommu_ops amd_iommu_ops = {
>      .read_msi_from_ire = amd_iommu_read_msi_from_ire,
>      .suspend = amd_iommu_suspend,
>      .resume = amd_iommu_resume,
> +    .share_p2m = amd_iommu_share_p2m,
>  };
> diff -r 1d9b0e45566e -r b5c197b1d2ac xen/drivers/passthrough/iommu.c
> --- a/xen/drivers/passthrough/iommu.c	Fri Apr 15 12:10:39 2011 +0200
> +++ b/xen/drivers/passthrough/iommu.c	Fri Apr 15 12:13:24 2011 +0200
> @@ -50,6 +50,7 @@ bool_t __read_mostly iommu_hap_pt_share;
>  bool_t __read_mostly iommu_hap_pt_share;
>  bool_t __read_mostly amd_iommu_debug;
>  bool_t __read_mostly amd_iommu_perdev_intremap;
> +bool_t __read_mostly iommu_sharept;
>  
>  static void __init parse_iommu_param(char *s)
>  {
> @@ -82,6 +83,8 @@ static void __init parse_iommu_param(cha
>              iommu_passthrough = 1;
>          else if ( !strcmp(s, "dom0-strict") )
>              iommu_dom0_strict = 1;
> +        else if ( !strcmp(s, "sharept") )
> +            iommu_sharept = 1;
>  
>          s = ss + 1;
>      } while ( ss );
> @@ -419,6 +422,14 @@ void iommu_suspend()
>          ops->suspend();
>  }
>  
> +void iommu_share_p2m_table(struct domain* d)
> +{
> +    const struct iommu_ops *ops = iommu_get_ops();
> +
> +    if ( iommu_enabled && is_hvm_domain(d) )
> +        ops->share_p2m(d);
> +}
> +
>  /*
>   * Local variables:
>   * mode: C
> diff -r 1d9b0e45566e -r b5c197b1d2ac xen/drivers/passthrough/vtd/iommu.c
> --- a/xen/drivers/passthrough/vtd/iommu.c	Fri Apr 15 12:10:39 2011 +0200
> +++ b/xen/drivers/passthrough/vtd/iommu.c	Fri Apr 15 12:13:24 2011 +0200
> @@ -1747,7 +1747,7 @@ static bool_t vtd_ept_share(void)
>      bool_t share = TRUE;
>  
>      /* sharept defaults to 0 for now, default to 1 when feature matures */
> -    if ( !sharept )
> +    if ( !iommu_sharept )
>          share = FALSE;
>  
>      /*
> @@ -2299,6 +2299,7 @@ const struct iommu_ops intel_iommu_ops >     
.read_msi_from_ire = msi_msg_read_remap_rte,
>      .suspend = vtd_suspend,
>      .resume = vtd_resume,
> +    .share_p2m = iommu_set_pgd,
>  };
>  
>  /*
> diff -r 1d9b0e45566e -r b5c197b1d2ac xen/include/xen/iommu.h
> --- a/xen/include/xen/iommu.h	Fri Apr 15 12:10:39 2011 +0200
> +++ b/xen/include/xen/iommu.h	Fri Apr 15 12:13:24 2011 +0200
> @@ -33,6 +33,7 @@ extern bool_t iommu_hap_pt_share;
>  extern bool_t iommu_hap_pt_share;
>  extern bool_t amd_iommu_debug;
>  extern bool_t amd_iommu_perdev_intremap;
> +extern bool_t iommu_sharept;
>  
>  extern struct rangeset *mmio_ro_ranges;
>  
> @@ -132,6 +133,7 @@ struct iommu_ops {
>      unsigned int (*read_apic_from_ire)(unsigned int apic, unsigned int
reg);
>      void (*suspend)(void);
>      void (*resume)(void);
> +    void (*share_p2m)(struct domain *d);
>  };
>  
>  void iommu_update_ire_from_apic(unsigned int apic, unsigned int reg,
unsigned int value);
> @@ -143,5 +145,6 @@ void iommu_resume(void);
>  void iommu_resume(void);
>  
>  void iommu_set_dom0_mapping(struct domain *d);
> +void iommu_share_p2m_table(struct domain *d);
>  
>  #endif /* _IOMMU_H_ */

-- 
Tim Deegan <Tim.Deegan@citrix.com>
Principal Software Engineer, Xen Platform Team
Citrix Systems UK Ltd.  (Company #02937203, SL9 0BG)

_______________________________________________
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Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel

Wei Wang2

2011-Apr-18 13:48 UTC

head link

[Xen-devel] Re: [PATCH V2 4/4] amd iommu: interfaces for p2m sharing

On Monday 18 April 2011 12:26:36 Tim Deegan wrote:> At 13:14 +0100 on 15 Apr (1302873244), Wei Wang2 wrote:
> > --
> > Advanced Micro Devices GmbH
> > Sitz: Dornach, Gemeinde Aschheim,
> > Landkreis München Registergericht München,
> > HRB Nr. 43632
> > WEEE-Reg-Nr: DE 12919551
> > Geschäftsführer:
> > Alberto Bozzo, Andrew Bowd
> >
> > # HG changeset patch
> > # User Wei Wang <wei.wang2@amd.com>
> > # Node ID b5c197b1d2ac80881d0683cdadf12ac33b762614
> > # Parent  1d9b0e45566ec3cd0e293212d9a454920116b2b1
> > Add a generic interface for both vtd and amd iommu p2m sharing. Also
> > introduce a new parameter (iommu=sharept) to enable this feature.
>
> Why does this introduce a separate variable?  Surely
"iommu=sharept"
> should just set iommu_hap_pt_share directly.  Also, it looks like
> "iommu=sharept" has different semantics on AMD and Intel machines
> (i.e., it does nothing on Intel). Was that the intention?Hi Tim
True, that is a little weird.. It looks like some vtd systems have compatible 
issue of re-using p2m table for iommu, so vtd code only turns 
iommu_hap_pt_share on after some compatible checks (in vtd_ept_share). To 
avoid breaking vtd, I intended to keep this in the new code. But your 
suggestion also looks good to me. We could set iommu_hap_pt_share directly 
and turn it off if vtd_ept_share() fails. New patch has been attached.
> The rest of this series looks OK to me.  Is it safe to apply the rest
> without this patch or should I wait for the next version and apply them
> all together?Yes, it should be OK to just apply the rest. Without the last one, p2m sharing 
will not been enabled.
Thanks,
Wei

> Cheers,
>
> Tim.
>
> > Signed-off-by: Wei Wang <wei.wang2@amd.com>
> >
> > diff -r 1d9b0e45566e -r b5c197b1d2ac xen/arch/x86/mm/p2m.c
> > --- a/xen/arch/x86/mm/p2m.c	Fri Apr 15 12:10:39 2011 +0200
> > +++ b/xen/arch/x86/mm/p2m.c	Fri Apr 15 12:13:24 2011 +0200
> > @@ -2061,8 +2061,8 @@ int p2m_alloc_table(struct p2m_domain *p
> >
> >      p2m->phys_table = pagetable_from_mfn(page_to_mfn(p2m_top));
> >
> > -    if ( hap_enabled(d) && (boot_cpu_data.x86_vendor =>
> X86_VENDOR_INTEL) ) -        iommu_set_pgd(d);
> > +    if ( hap_enabled(d) )
> > +        iommu_share_p2m_table(d);
> >
> >      P2M_PRINTK("populating p2m table\n");
> >
> > diff -r 1d9b0e45566e -r b5c197b1d2ac
> > xen/drivers/passthrough/amd/iommu_map.c ---
> > a/xen/drivers/passthrough/amd/iommu_map.c	Fri Apr 15 12:10:39 2011
+0200
> > +++ b/xen/drivers/passthrough/amd/iommu_map.c	Fri Apr 15 12:13:24 2011
> > +0200 @@ -716,6 +716,12 @@ void amd_iommu_share_p2m(struct domain *
> >
> >      ASSERT( is_hvm_domain(d) &&
d->arch.hvm_domain.hap_enabled );
> >
> > +    if ( !iommu_sharept )
> > +    {
> > +        iommu_hap_pt_share = 0;
> > +        return;
> > +    }
> > +
> >      pgd_mfn =
pagetable_get_mfn(p2m_get_pagetable(p2m_get_hostp2m(d)));
> >      p2m_table = mfn_to_page(mfn_x(pgd_mfn));
> >
> > diff -r 1d9b0e45566e -r b5c197b1d2ac
> > xen/drivers/passthrough/amd/pci_amd_iommu.c ---
> > a/xen/drivers/passthrough/amd/pci_amd_iommu.c	Fri Apr 15 12:10:39 2011
> > +0200 +++ b/xen/drivers/passthrough/amd/pci_amd_iommu.c	Fri Apr 15
> > 12:13:24 2011 +0200 @@ -458,4 +458,5 @@ const struct iommu_ops
> > amd_iommu_ops = {
> >      .read_msi_from_ire = amd_iommu_read_msi_from_ire,
> >      .suspend = amd_iommu_suspend,
> >      .resume = amd_iommu_resume,
> > +    .share_p2m = amd_iommu_share_p2m,
> >  };
> > diff -r 1d9b0e45566e -r b5c197b1d2ac xen/drivers/passthrough/iommu.c
> > --- a/xen/drivers/passthrough/iommu.c	Fri Apr 15 12:10:39 2011 +0200
> > +++ b/xen/drivers/passthrough/iommu.c	Fri Apr 15 12:13:24 2011 +0200
> > @@ -50,6 +50,7 @@ bool_t __read_mostly iommu_hap_pt_share;
> >  bool_t __read_mostly iommu_hap_pt_share;
> >  bool_t __read_mostly amd_iommu_debug;
> >  bool_t __read_mostly amd_iommu_perdev_intremap;
> > +bool_t __read_mostly iommu_sharept;
> >
> >  static void __init parse_iommu_param(char *s)
> >  {
> > @@ -82,6 +83,8 @@ static void __init parse_iommu_param(cha
> >              iommu_passthrough = 1;
> >          else if ( !strcmp(s, "dom0-strict") )
> >              iommu_dom0_strict = 1;
> > +        else if ( !strcmp(s, "sharept") )
> > +            iommu_sharept = 1;
> >
> >          s = ss + 1;
> >      } while ( ss );
> > @@ -419,6 +422,14 @@ void iommu_suspend()
> >          ops->suspend();
> >  }
> >
> > +void iommu_share_p2m_table(struct domain* d)
> > +{
> > +    const struct iommu_ops *ops = iommu_get_ops();
> > +
> > +    if ( iommu_enabled && is_hvm_domain(d) )
> > +        ops->share_p2m(d);
> > +}
> > +
> >  /*
> >   * Local variables:
> >   * mode: C
> > diff -r 1d9b0e45566e -r b5c197b1d2ac
xen/drivers/passthrough/vtd/iommu.c
> > --- a/xen/drivers/passthrough/vtd/iommu.c	Fri Apr 15 12:10:39 2011
+0200
> > +++ b/xen/drivers/passthrough/vtd/iommu.c	Fri Apr 15 12:13:24 2011
+0200
> > @@ -1747,7 +1747,7 @@ static bool_t vtd_ept_share(void)
> >      bool_t share = TRUE;
> >
> >      /* sharept defaults to 0 for now, default to 1 when feature
matures
> > */ -    if ( !sharept )
> > +    if ( !iommu_sharept )
> >          share = FALSE;
> >
> >      /*
> > @@ -2299,6 +2299,7 @@ const struct iommu_ops intel_iommu_ops > >
.read_msi_from_ire = msi_msg_read_remap_rte,
> >      .suspend = vtd_suspend,
> >      .resume = vtd_resume,
> > +    .share_p2m = iommu_set_pgd,
> >  };
> >
> >  /*
> > diff -r 1d9b0e45566e -r b5c197b1d2ac xen/include/xen/iommu.h
> > --- a/xen/include/xen/iommu.h	Fri Apr 15 12:10:39 2011 +0200
> > +++ b/xen/include/xen/iommu.h	Fri Apr 15 12:13:24 2011 +0200
> > @@ -33,6 +33,7 @@ extern bool_t iommu_hap_pt_share;
> >  extern bool_t iommu_hap_pt_share;
> >  extern bool_t amd_iommu_debug;
> >  extern bool_t amd_iommu_perdev_intremap;
> > +extern bool_t iommu_sharept;
> >
> >  extern struct rangeset *mmio_ro_ranges;
> >
> > @@ -132,6 +133,7 @@ struct iommu_ops {
> >      unsigned int (*read_apic_from_ire)(unsigned int apic, unsigned
int
> > reg); void (*suspend)(void);
> >      void (*resume)(void);
> > +    void (*share_p2m)(struct domain *d);
> >  };
> >
> >  void iommu_update_ire_from_apic(unsigned int apic, unsigned int reg,
> > unsigned int value); @@ -143,5 +145,6 @@ void iommu_resume(void);
> >  void iommu_resume(void);
> >
> >  void iommu_set_dom0_mapping(struct domain *d);
> > +void iommu_share_p2m_table(struct domain *d);
> >
> >  #endif /* _IOMMU_H_ */



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Xen-devel@lists.xensource.com
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Tim Deegan

2011-Apr-18 16:30 UTC

head link

[Xen-devel] Re: [PATCH V2 4/4] amd iommu: interfaces for p2m sharing

Hi, 

I''ve applied all of these.

Cc''ing Allen: this series changes the xen command-line rune to share
EPT
and VT-D pagetables from "sharept" to "iommu=sharept".  That
seems to me
like an improvement but if you don''t like it, shout. 

Cheers,

Tim.

At 14:48 +0100 on 18 Apr (1303138135), Wei Wang2 wrote:> On Monday 18 April 2011 12:26:36 Tim Deegan wrote:
> > At 13:14 +0100 on 15 Apr (1302873244), Wei Wang2 wrote:
> > > --
> > > Advanced Micro Devices GmbH
> > > Sitz: Dornach, Gemeinde Aschheim,
> > > Landkreis München Registergericht München,
> > > HRB Nr. 43632
> > > WEEE-Reg-Nr: DE 12919551
> > > Geschäftsführer:
> > > Alberto Bozzo, Andrew Bowd
> > >
> > > # HG changeset patch
> > > # User Wei Wang <wei.wang2@amd.com>
> > > # Node ID b5c197b1d2ac80881d0683cdadf12ac33b762614
> > > # Parent  1d9b0e45566ec3cd0e293212d9a454920116b2b1
> > > Add a generic interface for both vtd and amd iommu p2m sharing.
Also
> > > introduce a new parameter (iommu=sharept) to enable this feature.
> >
> > Why does this introduce a separate variable?  Surely
"iommu=sharept"
> > should just set iommu_hap_pt_share directly.  Also, it looks like
> > "iommu=sharept" has different semantics on AMD and Intel
machines
> > (i.e., it does nothing on Intel). Was that the intention?
> Hi Tim
> True, that is a little weird.. It looks like some vtd systems have
compatible
> issue of re-using p2m table for iommu, so vtd code only turns 
> iommu_hap_pt_share on after some compatible checks (in vtd_ept_share). To 
> avoid breaking vtd, I intended to keep this in the new code. But your 
> suggestion also looks good to me. We could set iommu_hap_pt_share directly 
> and turn it off if vtd_ept_share() fails. New patch has been attached.
> 
> > The rest of this series looks OK to me.  Is it safe to apply the rest
> > without this patch or should I wait for the next version and apply
them
> > all together?
> Yes, it should be OK to just apply the rest. Without the last one, p2m
sharing
> will not been enabled.
> Thanks,
> Wei
> 
> 
> > Cheers,
> >
> > Tim.
> >
> > > Signed-off-by: Wei Wang <wei.wang2@amd.com>
> > >
> > > diff -r 1d9b0e45566e -r b5c197b1d2ac xen/arch/x86/mm/p2m.c
> > > --- a/xen/arch/x86/mm/p2m.c	Fri Apr 15 12:10:39 2011 +0200
> > > +++ b/xen/arch/x86/mm/p2m.c	Fri Apr 15 12:13:24 2011 +0200
> > > @@ -2061,8 +2061,8 @@ int p2m_alloc_table(struct p2m_domain *p
> > >
> > >      p2m->phys_table =
pagetable_from_mfn(page_to_mfn(p2m_top));
> > >
> > > -    if ( hap_enabled(d) && (boot_cpu_data.x86_vendor
=> > > X86_VENDOR_INTEL) ) -        iommu_set_pgd(d);
> > > +    if ( hap_enabled(d) )
> > > +        iommu_share_p2m_table(d);
> > >
> > >      P2M_PRINTK("populating p2m table\n");
> > >
> > > diff -r 1d9b0e45566e -r b5c197b1d2ac
> > > xen/drivers/passthrough/amd/iommu_map.c ---
> > > a/xen/drivers/passthrough/amd/iommu_map.c	Fri Apr 15 12:10:39
2011 +0200
> > > +++ b/xen/drivers/passthrough/amd/iommu_map.c	Fri Apr 15 12:13:24
2011
> > > +0200 @@ -716,6 +716,12 @@ void amd_iommu_share_p2m(struct domain
*
> > >
> > >      ASSERT( is_hvm_domain(d) &&
d->arch.hvm_domain.hap_enabled );
> > >
> > > +    if ( !iommu_sharept )
> > > +    {
> > > +        iommu_hap_pt_share = 0;
> > > +        return;
> > > +    }
> > > +
> > >      pgd_mfn =
pagetable_get_mfn(p2m_get_pagetable(p2m_get_hostp2m(d)));
> > >      p2m_table = mfn_to_page(mfn_x(pgd_mfn));
> > >
> > > diff -r 1d9b0e45566e -r b5c197b1d2ac
> > > xen/drivers/passthrough/amd/pci_amd_iommu.c ---
> > > a/xen/drivers/passthrough/amd/pci_amd_iommu.c	Fri Apr 15 12:10:39
2011
> > > +0200 +++ b/xen/drivers/passthrough/amd/pci_amd_iommu.c	Fri Apr
15
> > > 12:13:24 2011 +0200 @@ -458,4 +458,5 @@ const struct iommu_ops
> > > amd_iommu_ops = {
> > >      .read_msi_from_ire = amd_iommu_read_msi_from_ire,
> > >      .suspend = amd_iommu_suspend,
> > >      .resume = amd_iommu_resume,
> > > +    .share_p2m = amd_iommu_share_p2m,
> > >  };
> > > diff -r 1d9b0e45566e -r b5c197b1d2ac
xen/drivers/passthrough/iommu.c
> > > --- a/xen/drivers/passthrough/iommu.c	Fri Apr 15 12:10:39 2011
+0200
> > > +++ b/xen/drivers/passthrough/iommu.c	Fri Apr 15 12:13:24 2011
+0200
> > > @@ -50,6 +50,7 @@ bool_t __read_mostly iommu_hap_pt_share;
> > >  bool_t __read_mostly iommu_hap_pt_share;
> > >  bool_t __read_mostly amd_iommu_debug;
> > >  bool_t __read_mostly amd_iommu_perdev_intremap;
> > > +bool_t __read_mostly iommu_sharept;
> > >
> > >  static void __init parse_iommu_param(char *s)
> > >  {
> > > @@ -82,6 +83,8 @@ static void __init parse_iommu_param(cha
> > >              iommu_passthrough = 1;
> > >          else if ( !strcmp(s, "dom0-strict") )
> > >              iommu_dom0_strict = 1;
> > > +        else if ( !strcmp(s, "sharept") )
> > > +            iommu_sharept = 1;
> > >
> > >          s = ss + 1;
> > >      } while ( ss );
> > > @@ -419,6 +422,14 @@ void iommu_suspend()
> > >          ops->suspend();
> > >  }
> > >
> > > +void iommu_share_p2m_table(struct domain* d)
> > > +{
> > > +    const struct iommu_ops *ops = iommu_get_ops();
> > > +
> > > +    if ( iommu_enabled && is_hvm_domain(d) )
> > > +        ops->share_p2m(d);
> > > +}
> > > +
> > >  /*
> > >   * Local variables:
> > >   * mode: C
> > > diff -r 1d9b0e45566e -r b5c197b1d2ac
xen/drivers/passthrough/vtd/iommu.c
> > > --- a/xen/drivers/passthrough/vtd/iommu.c	Fri Apr 15 12:10:39
2011 +0200
> > > +++ b/xen/drivers/passthrough/vtd/iommu.c	Fri Apr 15 12:13:24
2011 +0200
> > > @@ -1747,7 +1747,7 @@ static bool_t vtd_ept_share(void)
> > >      bool_t share = TRUE;
> > >
> > >      /* sharept defaults to 0 for now, default to 1 when feature
matures
> > > */ -    if ( !sharept )
> > > +    if ( !iommu_sharept )
> > >          share = FALSE;
> > >
> > >      /*
> > > @@ -2299,6 +2299,7 @@ const struct iommu_ops intel_iommu_ops >
> >      .read_msi_from_ire = msi_msg_read_remap_rte,
> > >      .suspend = vtd_suspend,
> > >      .resume = vtd_resume,
> > > +    .share_p2m = iommu_set_pgd,
> > >  };
> > >
> > >  /*
> > > diff -r 1d9b0e45566e -r b5c197b1d2ac xen/include/xen/iommu.h
> > > --- a/xen/include/xen/iommu.h	Fri Apr 15 12:10:39 2011 +0200
> > > +++ b/xen/include/xen/iommu.h	Fri Apr 15 12:13:24 2011 +0200
> > > @@ -33,6 +33,7 @@ extern bool_t iommu_hap_pt_share;
> > >  extern bool_t iommu_hap_pt_share;
> > >  extern bool_t amd_iommu_debug;
> > >  extern bool_t amd_iommu_perdev_intremap;
> > > +extern bool_t iommu_sharept;
> > >
> > >  extern struct rangeset *mmio_ro_ranges;
> > >
> > > @@ -132,6 +133,7 @@ struct iommu_ops {
> > >      unsigned int (*read_apic_from_ire)(unsigned int apic,
unsigned int
> > > reg); void (*suspend)(void);
> > >      void (*resume)(void);
> > > +    void (*share_p2m)(struct domain *d);
> > >  };
> > >
> > >  void iommu_update_ire_from_apic(unsigned int apic, unsigned int
reg,
> > > unsigned int value); @@ -143,5 +145,6 @@ void iommu_resume(void);
> > >  void iommu_resume(void);
> > >
> > >  void iommu_set_dom0_mapping(struct domain *d);
> > > +void iommu_share_p2m_table(struct domain *d);
> > >
> > >  #endif /* _IOMMU_H_ */
> 
> 
> # HG changeset patch
> # User Wei Wang <wei.wang2@amd.com>
> # Node ID 15a9daf8a8aedf21e941a9ed3cb250536ac6972f
> # Parent  5846cc03cf0c1a4b02eba76a7b4aa4884de5e957
> Add a generic interface for both vtd and amd iommu p2m sharing. Also
introduce a new parameter (iommu=sharept) to enable this feature.
> 
> Signed-off-by: Wei Wang <wei.wang2@amd.com>
> 
> diff -r 5846cc03cf0c -r 15a9daf8a8ae xen/arch/x86/mm/p2m.c
> --- a/xen/arch/x86/mm/p2m.c	Mon Apr 18 15:01:52 2011 +0200
> +++ b/xen/arch/x86/mm/p2m.c	Mon Apr 18 15:37:28 2011 +0200
> @@ -2061,8 +2061,8 @@ int p2m_alloc_table(struct p2m_domain *p
>  
>      p2m->phys_table = pagetable_from_mfn(page_to_mfn(p2m_top));
>  
> -    if ( hap_enabled(d) && (boot_cpu_data.x86_vendor ==
X86_VENDOR_INTEL) )
> -        iommu_set_pgd(d);
> +    if ( hap_enabled(d) )
> +        iommu_share_p2m_table(d);
>  
>      P2M_PRINTK("populating p2m table\n");
>  
> diff -r 5846cc03cf0c -r 15a9daf8a8ae
xen/drivers/passthrough/amd/iommu_map.c
> --- a/xen/drivers/passthrough/amd/iommu_map.c	Mon Apr 18 15:01:52 2011
+0200
> +++ b/xen/drivers/passthrough/amd/iommu_map.c	Mon Apr 18 15:37:28 2011
+0200
> @@ -716,6 +716,9 @@ void amd_iommu_share_p2m(struct domain *
>  
>      ASSERT( is_hvm_domain(d) && d->arch.hvm_domain.hap_enabled
);
>  
> +    if ( !iommu_hap_pt_share )
> +        return;
> +
>      pgd_mfn = pagetable_get_mfn(p2m_get_pagetable(p2m_get_hostp2m(d)));
>      p2m_table = mfn_to_page(mfn_x(pgd_mfn));
>  
> @@ -726,8 +729,6 @@ void amd_iommu_share_p2m(struct domain *
>  
>          /* When sharing p2m with iommu, paging mode = 4 */
>          hd->paging_mode = IOMMU_PAGING_MODE_LEVEL_4;
> -        iommu_hap_pt_share = 1;
> -
>          AMD_IOMMU_DEBUG("Share p2m table with iommu: p2m table =
0x%lx\n",
>                          mfn_x(pgd_mfn));
>      }
> diff -r 5846cc03cf0c -r 15a9daf8a8ae
xen/drivers/passthrough/amd/pci_amd_iommu.c
> --- a/xen/drivers/passthrough/amd/pci_amd_iommu.c	Mon Apr 18 15:01:52 2011
+0200
> +++ b/xen/drivers/passthrough/amd/pci_amd_iommu.c	Mon Apr 18 15:37:28 2011
+0200
> @@ -458,4 +458,5 @@ const struct iommu_ops amd_iommu_ops = {
>      .read_msi_from_ire = amd_iommu_read_msi_from_ire,
>      .suspend = amd_iommu_suspend,
>      .resume = amd_iommu_resume,
> +    .share_p2m = amd_iommu_share_p2m,
>  };
> diff -r 5846cc03cf0c -r 15a9daf8a8ae xen/drivers/passthrough/iommu.c
> --- a/xen/drivers/passthrough/iommu.c	Mon Apr 18 15:01:52 2011 +0200
> +++ b/xen/drivers/passthrough/iommu.c	Mon Apr 18 15:37:28 2011 +0200
> @@ -82,6 +82,8 @@ static void __init parse_iommu_param(cha
>              iommu_passthrough = 1;
>          else if ( !strcmp(s, "dom0-strict") )
>              iommu_dom0_strict = 1;
> +        else if ( !strcmp(s, "sharept") )
> +            iommu_hap_pt_share = 1;
>  
>          s = ss + 1;
>      } while ( ss );
> @@ -419,6 +421,14 @@ void iommu_suspend()
>          ops->suspend();
>  }
>  
> +void iommu_share_p2m_table(struct domain* d)
> +{
> +    const struct iommu_ops *ops = iommu_get_ops();
> +
> +    if ( iommu_enabled && is_hvm_domain(d) )
> +        ops->share_p2m(d);
> +}
> +
>  /*
>   * Local variables:
>   * mode: C
> diff -r 5846cc03cf0c -r 15a9daf8a8ae xen/drivers/passthrough/vtd/iommu.c
> --- a/xen/drivers/passthrough/vtd/iommu.c	Mon Apr 18 15:01:52 2011 +0200
> +++ b/xen/drivers/passthrough/vtd/iommu.c	Mon Apr 18 15:37:28 2011 +0200
> @@ -45,9 +45,6 @@
>  #define nr_ioapics              iosapic_get_nr_iosapics()
>  #endif
>  
> -static int sharept = 0;
> -boolean_param("sharept", sharept);
> -
>  int nr_iommus;
>  
>  static void setup_dom0_devices(struct domain *d);
> @@ -1747,7 +1744,7 @@ static bool_t vtd_ept_share(void)
>      bool_t share = TRUE;
>  
>      /* sharept defaults to 0 for now, default to 1 when feature matures */
> -    if ( !sharept )
> +    if ( !iommu_hap_pt_share )
>          share = FALSE;
>  
>      /*
> @@ -2299,6 +2296,7 @@ const struct iommu_ops intel_iommu_ops >     
.read_msi_from_ire = msi_msg_read_remap_rte,
>      .suspend = vtd_suspend,
>      .resume = vtd_resume,
> +    .share_p2m = iommu_set_pgd,
>  };
>  
>  /*
> diff -r 5846cc03cf0c -r 15a9daf8a8ae xen/include/xen/iommu.h
> --- a/xen/include/xen/iommu.h	Mon Apr 18 15:01:52 2011 +0200
> +++ b/xen/include/xen/iommu.h	Mon Apr 18 15:37:28 2011 +0200
> @@ -132,6 +132,7 @@ struct iommu_ops {
>      unsigned int (*read_apic_from_ire)(unsigned int apic, unsigned int
reg);
>      void (*suspend)(void);
>      void (*resume)(void);
> +    void (*share_p2m)(struct domain *d);
>  };
>  
>  void iommu_update_ire_from_apic(unsigned int apic, unsigned int reg,
unsigned int value);
> @@ -143,5 +144,6 @@ void iommu_resume(void);
>  void iommu_resume(void);
>  
>  void iommu_set_dom0_mapping(struct domain *d);
> +void iommu_share_p2m_table(struct domain *d);
>  
>  #endif /* _IOMMU_H_ */

-- 
Tim Deegan <Tim.Deegan@citrix.com>
Principal Software Engineer, Xen Platform Team
Citrix Systems UK Ltd.  (Company #02937203, SL9 0BG)

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Xen devel - Apr 2011 - [PATCH V2 4/4] amd iommu: interfaces for p2m sharing

[Xen-devel] [PATCH V2 4/4] amd iommu: interfaces for p2m sharing

[Xen-devel] Re: [PATCH V2 4/4] amd iommu: interfaces for p2m sharing

[Xen-devel] Re: [PATCH V2 4/4] amd iommu: interfaces for p2m sharing

[Xen-devel] Re: [PATCH V2 4/4] amd iommu: interfaces for p2m sharing