 Home |
Products |
Support |
Community |
News |
xen-devel
Re: [Xen-devel] readonly grants
| To: | Mohammad Hedayati <hedayati.mo@xxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] readonly grants |
| From: | Tim Deegan <tim@xxxxxxx> |
| Date: | Thu, 27 Oct 2011 12:01:27 +0100 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Thu, 27 Oct 2011 04:05:36 -0700 |
| Envelope-to: | www-data@xxxxxxxxxxxxxxxxxxx |
| In-reply-to: | <CABA5EEsXEhN8DPwbm-YLMwW8qVK-1-gV37vCYCu=spG8uUUZ5g@xxxxxxxxxxxxxx> |
| List-help: | <mailto:xen-devel-request@lists.xensource.com?subject=help> |
| List-id: | Xen developer discussion <xen-devel.lists.xensource.com> |
| List-post: | <mailto:xen-devel@lists.xensource.com> |
| List-subscribe: | <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe> |
| List-unsubscribe: | <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe> |
| References: | <CABA5EEsXEhN8DPwbm-YLMwW8qVK-1-gV37vCYCu=spG8uUUZ5g@xxxxxxxxxxxxxx> |
| Sender: | xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
| User-agent: | Mutt/1.4.2.1i |
At 20:16 +0330 on 26 Oct (1319660209), Mohammad Hedayati wrote: > After mapping a readonly granted page in a PV guest, the guest can try to > change his l1 page table entry, faulting into Xen. Here xen emulates the > update operation, but first it must check whether the modification is > allowed or not (i.e. the grant is readonly or not). > I'm looking through the code, but I can't find where this checking is done. Emulated writes go through ptwr_emulated_update() which calls get_page_from_l1e(), which won't let the guest write a PTE that maps another VM's memory. Tim. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
| <Prev in Thread] | Current Thread | [Next in Thread> |
|---|---|---|
| ||
| Previous by Date: | Re: [Xen-devel] Hypercall by DomU Application, Tim Deegan |
|---|---|
| Next by Date: | Re: [Xen-devel] Clock jumping during live migrations, Tim Deegan |
| Previous by Thread: | Re: [Xen-devel] readonly grants, Ian Campbell |
| Next by Thread: | [Xen-devel] [PATCH] docs, Add HowTo use QEMU upstream., Anthony PERARD |
| Indexes: | [Date] [Thread] [Top] [All Lists] |
