 Home |
Products |
Support |
Community |
News |
xen-devel
Re: [Xen-devel] hvm_copy_from_guest_virt
| To: | Wu Bingzheng <wubingzheng@xxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] hvm_copy_from_guest_virt |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Fri, 11 Sep 2009 07:43:40 +0100 |
| Cc: | |
| Delivery-date: | Thu, 10 Sep 2009 23:44:15 -0700 |
| Envelope-to: | www-data@xxxxxxxxxxxxxxxxxxx |
| In-reply-to: | <6857960.101761252635960996.JavaMail.coremail@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> |
| Sender: | xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
| Thread-index: | Acoyh0r1dpWSZWpmR3WosfKbarqNpAAI+dyt |
| Thread-topic: | [Xen-devel] hvm_copy_from_guest_virt |
| User-agent: | Microsoft-Entourage/12.20.0.090605 |
On 11/09/2009 03:26, "Wu Bingzheng" <wubingzheng@xxxxxxx> wrote: > In Xen 3.3.0, hvm's shadow page fault handler: sh_page_fault(): > I call 'hvm_copy_from_guest_virt' to read some guest's (Windows XP) memory. > If I read user space, it works fine. > If I read kernel space, like 0x8xxxxxxx or 0xFxxxxxxx, it retures > HVMCOPY_bad_gva_to_gfn. > I am sure that the page I read is present in guest's page table. > > Can I copy memory from kernel space? Yes. Either the pages are not present in the pagetable, or you passed PFEC_user_mode flag in the fourth argument to hvm_copy_from_guest_virt(). -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
| <Prev in Thread] | Current Thread | [Next in Thread> |
|---|---|---|
| ||
| Previous by Date: | [Xen-devel] hvm_copy_from_guest_virt, Wu Bingzheng |
|---|---|
| Next by Date: | [Xen-devel] [PATCH] [IOMMU] queued invalidation clean up, Zhai, Edwin |
| Previous by Thread: | [Xen-devel] hvm_copy_from_guest_virt, Wu Bingzheng |
| Next by Thread: | [Xen-devel] [PATCH] [IOMMU] queued invalidation clean up, Zhai, Edwin |
| Indexes: | [Date] [Thread] [Top] [All Lists] |
