On Mon, Mar 04, 2013 at 08:40:29PM +0100, Jan Kiszka wrote: > The logic for calculating the value with which we call kvm_set_cr0/4 was > broken (will definitely be visible with nested unrestricted guest mode > support). Also, we performed the check regarding CR0_ALWAYSON too early > when in guest mode. > > What really needs to be done on both CR0 and CR4 is to mask out L1-owned > bits and merge them in from GUEST_CR0/4. In contrast, arch.cr0/4 and > arch.cr0/4_guest_owned_bits contain the mangled L0+L1 state and, thus, > are not suited as input. > > For both CRs, we can then apply the check against VMXON_CRx_ALWAYSON and > refuse the update if it fails. To be fully consistent, we implement this > check now also for CR4. > > Finally, we have to set the shadow to the value L2 wanted to write > originally. > > Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
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