[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH RFC v13 07/20] pvh: Do not allow PVH guests to change paging modes
Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx> Signed-off-by: Mukesh Rathor <mukesh.rathor@xxxxxxxxxx> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx> --- v13: Removed unnecessary else. CC: Jan Beulich <jbeulich@xxxxxxxx> CC: Tim Deegan <tim@xxxxxxx> CC: Keir Fraser <keir@xxxxxxx> --- xen/arch/x86/hvm/hvm.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c index 370bd4d..7f7b9f5 100644 --- a/xen/arch/x86/hvm/hvm.c +++ b/xen/arch/x86/hvm/hvm.c @@ -1765,6 +1765,16 @@ int hvm_set_cr0(unsigned long value) (value & (X86_CR0_PE | X86_CR0_PG)) == X86_CR0_PG ) goto gpf; + + + /* A pvh is not expected to change to real mode. */ + if ( is_pvh_vcpu(v) + && (value & (X86_CR0_PE | X86_CR0_PG)) != (X86_CR0_PG | X86_CR0_PE) ) + { + printk(XENLOG_G_WARNING + "PVH attempting to turn off PE/PG. CR0:%lx\n", value); + goto gpf; + } if ( (value & X86_CR0_PG) && !(old_value & X86_CR0_PG) ) { if ( v->arch.hvm_vcpu.guest_efer & EFER_LME ) -- 1.7.9.5 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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