[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] [SVM]: Make 32bit legacy guests boot again
Tnx. I will check as soon as it appears in the public staging tree. Christoph On Saturday 27 June 2009 11:35:20 Keir Fraser wrote: > Changeset 19856 is a cleaned up and streamlined version of this patch. > Please take a look. It also fixes a couple of largely theoretical issues: > * Should depend on EFER.LMA not EFER.LME > * Should handle the LMA 1->0 transition (i.e., return to legacy mode). > > -- Keir > > On 26/06/2009 16:19, "Christoph Egger" <Christoph.Egger@xxxxxxx> wrote: > > Hi! > > > > Attached patch fixes a bug introduced in c/s 19648. > > > > 32bit legacy guests have the sysenter/sysexit instructions available. > > Therefore, we have to disable intercepts for the sysenter MSRs or the > > guest stucks in an infinite loop of #GPs, otherwise. > > > > For guests in 64bit mode and 32bit compat mode, sysenter/sysexit > > instructions aren't available. The sysenter MSRs have to be intercepted > > to make the instruction emulation working. > > > > Attach patch first assumes the guest is in 32bit legacy mode and > > therefore disables the sysenter MSRs in construct_vmcb(). > > Access to the MSR_EFER is intercepted. When the guest enables longmode, > > then enable interception of the sysenter MSRs. > > > > Signed-off-by: Christoph Egger <Christoph.Egger@xxxxxxx> -- ---to satisfy European Law for business letters: Advanced Micro Devices GmbH Karl-Hammerschmidt-Str. 34, 85609 Dornach b. Muenchen Geschaeftsfuehrer: Thomas M. McCoy, Giuliano Meroni Sitz: Dornach, Gemeinde Aschheim, Landkreis Muenchen Registergericht Muenchen, HRB Nr. 43632 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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