[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] [SVM]: Make 32bit legacy guests boot again
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 Attachment:
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