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Re: [Xen-devel] [PATCH] ignore guest writes to read only memory regions
| To: | "Li, Xin" <xin.li@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] ignore guest writes to read only memory regions or memory holes in EPT |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Mon, 26 Oct 2009 09:08:39 +0000 |
| Cc: | |
| Delivery-date: | Mon, 26 Oct 2009 02:09:04 -0700 |
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| Thread-topic: | [Xen-devel] [PATCH] ignore guest writes to read only memory regions or memory holes in EPT |
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On 26/10/2009 08:45, "Li, Xin" <xin.li@xxxxxxxxx> wrote: >> ignore guest writes to read only memory regions or memory holes in EPT. > > Keir, > For reads from memory holes, hw returns a value with all bits set. Xen should > emulate this behavior, and this needs to change Xen x86 instruction emulation > code. do we already have such logic in Xen? > > In early days, such reads were sent to Qemu, which returns 0xFFFFFFFF, 0xFFFF > or 0xFF. I think we should already handle this correctly with the existing handle_mmio() case in ept_handle_violation(). The read should indeed go to qemu which should do the right thing. But also see my previous email about simplifying and robustifying ept_handle_violation(). -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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