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Revert "KVM: x86: check for cr3 validity in ioctl_set_sregs"

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This reverts commit 6c20e1442bb1c62914bb85b7f4a38973d2a423ba.

To my understanding, it became obsolete with the advent of the more
robust check in mmu_alloc_roots (89da4ff17f). Moreover, it prevents
the conceptually safe pattern

 1. set sregs
 2. register mem-slots
 3. run vcpu

by setting a sticky triple fault during step 1.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Jan Kiszka 2009-07-01 20:52:03 +02:00 committed by Avi Kivity
parent 6098ca939e
commit dc7e795e3d
1 changed files with 1 additions and 7 deletions
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8
arch/x86/kvm/x86.c
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@ -4326,13 +4326,7 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
vcpu->arch.cr2 = sregs->cr2;
mmu_reset_needed |= vcpu->arch.cr3 != sregs->cr3;
down_read(&vcpu->kvm->slots_lock);
if (gfn_to_memslot(vcpu->kvm, sregs->cr3 >> PAGE_SHIFT))
vcpu->arch.cr3 = sregs->cr3;
else
set_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests);
up_read(&vcpu->kvm->slots_lock);
vcpu->arch.cr3 = sregs->cr3;
kvm_set_cr8(vcpu, sregs->cr8);