[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] EFER in HVM guests
> -----Original Message----- > From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx > [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of > Jan Beulich > Sent: 29 November 2006 13:07 > To: xen-devel@xxxxxxxxxxxxxxxxxxx > Subject: [Xen-devel] EFER in HVM guests > > Is it intentional that > - under SVM, 32-bit guests can freely set EFER.LME Ehm, I guess you mean "on 32-bit hypervisor", as it's impossible to distinguish a 32-bit and 64-bit guest until the guest is setting LME... ;-). The correct reaction for a 32-bit hypervisor is to react like a "non-64-bit capable processor", which means that EFER has the LME as a mbz-bit. GP-fault if it's written as a one. We do prevent the long-mode from being advertised by CPUID when HV is in 32-bit mode, so if the guest is well-behaved, it shouldn't try to set this bit. -- Mats > - under VMX, 32-bit guests can't access EFER at all? > > Thanks, Jan > > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxxxxxxxx > http://lists.xensource.com/xen-devel > > > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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