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Re: [Xen-devel] [PATCH] x86: restrict HVMOP_pagetable_dying to current
- To: Jan Beulich <JBeulich@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 5 Oct 2018 12:58:43 +0100
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- Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>
- Delivery-date: Fri, 05 Oct 2018 11:58:48 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 05/10/18 12:29, Jan Beulich wrote:
> This is not used (and probably was never meant to be) by the tool stack.
> Limiting it to the current domain in particular allows to eliminate a
> bogus use of vCPU 0 in pagetable_dying().
>
> Remove the now unnecessary domain/vCPU parameters from the wrapper/hook
> functions at the same time.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> --- a/xen/arch/x86/hvm/hvm.c
> +++ b/xen/arch/x86/hvm/hvm.c
> @@ -4895,10 +4895,12 @@ long do_hvm_op(unsigned long op, XEN_GUE
> return -ESRCH;
>
> rc = -EINVAL;
> - if ( is_hvm_domain(d) && paging_mode_shadow(d) )
> + if ( unlikely(d != current->domain) )
> + rc = -EOPNOTSUPP;
> + else if ( is_hvm_domain(d) && paging_mode_shadow(d) )
> rc = xsm_hvm_param(XSM_TARGET, d, op);
As we're switching to current-only, shouldn't this turn to XSM_HOOK ?
Everything else LGTM, with one small suggestion....
> if ( !rc )
> - pagetable_dying(d, a.gpa);
> + pagetable_dying(a.gpa);
>
> rcu_unlock_domain(d);
> break;
> --- a/xen/include/asm-x86/paging.h
> +++ b/xen/include/asm-x86/paging.h
> @@ -345,7 +345,7 @@ void paging_write_p2m_entry(struct p2m_d
>
> /* Called from the guest to indicate that the a process is being
> * torn down and its pagetables will soon be discarded */
> -void pagetable_dying(struct domain *d, paddr_t gpa);
> +void pagetable_dying(paddr_t gpa);
Fix the comment style while in this area?
~Andrew
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