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KVM: Don't allow the guest to turn off the cpu cache
author
Avi Kivity
<avi@qumranet.com>
Wed, 21 Mar 2007 16:11:36 +0000
(18:11 +0200)
committer
Avi Kivity
<avi@qumranet.com>
Thu, 3 May 2007 07:52:26 +0000
(10:52 +0300)
The cpu cache is a host resource; the guest should not be able to turn
it off (even for itself).
Signed-off-by: Avi Kivity <avi@qumranet.com>
drivers/kvm/svm.c
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diff --git
a/drivers/kvm/svm.c
b/drivers/kvm/svm.c
index d3cc1157d23bdb13768b02809a45ac9e7655c0dc..191bc45b83e089f118f74b4bcbe26564f94233d0 100644
(file)
--- a/
drivers/kvm/svm.c
+++ b/
drivers/kvm/svm.c
@@
-737,8
+737,10
@@
static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
}
#endif
vcpu->svm->cr0 = cr0;
- vcpu->svm->vmcb->save.cr0 = cr0 | CR0_PG_MASK | CR0_WP_MASK;
vcpu->cr0 = cr0;
+ cr0 |= CR0_PG_MASK | CR0_WP_MASK;
+ cr0 &= ~(CR0_CD_MASK | CR0_NW_MASK);
+ vcpu->svm->vmcb->save.cr0 = cr0;
}
static void svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)