Re: [PATCH RFC 02/12] x86/np2m: add np2m_flush_eptp()

["Egger, Christoph" <chegger@amazon.de>]

On 18.07.17 12:34, Sergey Dyasli wrote:
> The new function finds all np2m objects with the specified eptp and
> flushes them. p2m_flush_table_locked() is added in order not to release
> the p2m lock after np2m_base check.
> 
> Signed-off-by: Sergey Dyasli <sergey.dyasli@citrix.com>
> ---
>  xen/arch/x86/mm/p2m.c     | 34 +++++++++++++++++++++++++++++++---
>  xen/include/asm-x86/p2m.h |  2 ++
>  2 files changed, 33 insertions(+), 3 deletions(-)
> 
> diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
> index b8c8bba421..bc330d8f52 100644
> --- a/xen/arch/x86/mm/p2m.c
> +++ b/xen/arch/x86/mm/p2m.c
> @@ -1708,15 +1708,14 @@ p2m_getlru_nestedp2m(struct domain *d, struct p2m_domain *p2m)
>      return p2m;
>  }
>  
> -/* Reset this p2m table to be empty */
>  static void
> -p2m_flush_table(struct p2m_domain *p2m)
> +p2m_flush_table_locked(struct p2m_domain *p2m)
>  {
>      struct page_info *top, *pg;
>      struct domain *d = p2m->domain;
>      mfn_t mfn;
>  
> -    p2m_lock(p2m);
> +    ASSERT(p2m_locked_by_me(p2m));
>  
>      /*
>       * "Host" p2m tables can have shared entries &c that need a bit more care
> @@ -1756,6 +1755,14 @@ p2m_flush_table(struct p2m_domain *p2m)
>      p2m_unlock(p2m);
>  }
>  
> +/* Reset this p2m table to be empty */
> +static void
> +p2m_flush_table(struct p2m_domain *p2m)
> +{
> +    p2m_lock(p2m);
> +    p2m_flush_table_locked(p2m);
> +}
> +
>  void
>  p2m_flush(struct vcpu *v, struct p2m_domain *p2m)
>  {
> @@ -1773,6 +1780,27 @@ p2m_flush_nestedp2m(struct domain *d)
>          p2m_flush_table(d->arch.nested_p2m[i]);
>  }
>  
> +void np2m_flush_eptp(struct vcpu *v, unsigned long eptp)
> +{
> +    struct domain *d = v->domain;
> +    struct p2m_domain *p2m;
> +    unsigned int i;
> +
> +    eptp &= ~(0xfffull);
> +
> +    nestedp2m_lock(d);
> +    for ( i = 0; i < MAX_NESTEDP2M; i++ )
> +    {
> +        p2m = d->arch.nested_p2m[i];
> +        p2m_lock(p2m);
> +        if ( p2m->np2m_base == eptp )
> +            p2m_flush_table_locked(p2m);
> +        else
> +            p2m_unlock(p2m);
> +    }
> +    nestedp2m_unlock(d);
> +}
> +

What exactly is eptp specific in this function ?

Christoph


>  static void assign_np2m(struct vcpu *v, struct p2m_domain *p2m)
>  {
>      struct nestedvcpu *nv = &vcpu_nestedhvm(v);
> diff --git a/xen/include/asm-x86/p2m.h b/xen/include/asm-x86/p2m.h
> index 9086bb35dc..0e39999387 100644
> --- a/xen/include/asm-x86/p2m.h
> +++ b/xen/include/asm-x86/p2m.h
> @@ -779,6 +779,8 @@ int p2m_pt_handle_deferred_changes(uint64_t gpa);
>  void p2m_flush(struct vcpu *v, struct p2m_domain *p2m);
>  /* Flushes all nested p2m tables */
>  void p2m_flush_nestedp2m(struct domain *d);
> +/* Flushes all np2m objects with the specified eptp */
> +void np2m_flush_eptp(struct vcpu *v, unsigned long eptp);
>  
>  void nestedp2m_write_p2m_entry(struct p2m_domain *p2m, unsigned long gfn,
>      l1_pgentry_t *p, l1_pgentry_t new, unsigned int level);
> 

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