[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v5 2/5] x86/pvh: Do not allow 32-bit PVH guests to clear CR4's PAE bit
.. since we only support 32-bit PV(H) guests in PAE mode. Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx> --- xen/arch/x86/hvm/hvm.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c index 90ba676..6f6cadc 100644 --- a/xen/arch/x86/hvm/hvm.c +++ b/xen/arch/x86/hvm/hvm.c @@ -3524,11 +3524,19 @@ int hvm_set_cr4(unsigned long value, bool_t may_defer) goto gpf; } - if ( !(value & X86_CR4_PAE) && hvm_long_mode_enabled(v) ) + if ( !(value & X86_CR4_PAE) ) { - HVM_DBG_LOG(DBG_LEVEL_1, "Guest cleared CR4.PAE while " - "EFER.LMA is set"); - goto gpf; + if ( hvm_long_mode_enabled(v) ) + { + HVM_DBG_LOG(DBG_LEVEL_1, "Guest cleared CR4.PAE while " + "EFER.LMA is set"); + goto gpf; + } + if ( is_pvh_vcpu(v) ) + { + HVM_DBG_LOG(DBG_LEVEL_1, "32-bit PVH guest cleared CR4.PAE"); + goto gpf; + } } old_cr = v->arch.hvm_vcpu.guest_cr[4]; -- 1.8.1.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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