Messages in this thread | | | Date | Mon, 26 May 2014 13:55:18 -0300 | From | Marcelo Tosatti <> | Subject | Re: [PATCH v2 1/4] KVM: x86: use new CS.RPL as CPL during task switch |
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On Thu, May 15, 2014 at 06:51:28PM +0200, Paolo Bonzini wrote: > During task switch, all of CS.DPL, CS.RPL, SS.DPL must match (in addition > to all the other requirements) and will be the new CPL. So far this > worked by carefully setting the CS selector and flag before doing the > task switch; however, this will not work once we get the CPL from SS.DPL: > setting SS itself would fail if the task switch changes the privilege > level. > > Temporarily assume that the CPL comes from CS.RPL during task switch > to a protected-mode task. This is the same approach used in QEMU's > emulation code, which (until version 2.0) manually tracks the CPL. > > Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
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