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From: Avi Kivity <avi@qumranet.com>
To: kvm-devel@lists.sourceforge.net
Cc: linux-kernel@vger.kernel.org, Avi Kivity <avi@qumranet.com>
Subject: [PATCH 27/41] KVM: Don't allow the guest to turn off the cpu cache
Date: Sun,  1 Apr 2007 17:35:24 +0300	[thread overview]
Message-ID: <11754381391993-git-send-email-avi@qumranet.com> (raw)
In-Reply-To: <1175438139141-git-send-email-avi@qumranet.com>

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 |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c
index d3cc115..191bc45 100644
--- 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)
-- 
1.5.0.5


  reply	other threads:[~2007-04-01 14:44 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-04-01 14:34 [PATCH 00/41] kvm updates for 2.6.22 Avi Kivity
2007-04-01 14:34 ` [PATCH 01/41] KVM: Fix guest register corruption on paravirt hypercall Avi Kivity
2007-04-01 14:34   ` [PATCH 02/41] KVM: Use the generic skip_emulated_instruction() in hypercall code Avi Kivity
2007-04-01 14:35     ` [PATCH 03/41] KVM: Use own minor number Avi Kivity
2007-04-01 14:35       ` [PATCH 04/41] KVM: Export <linux/kvm.h> Avi Kivity
2007-04-01 14:35         ` [PATCH 05/41] KVM: Fix bogus sign extension in mmu mapping audit Avi Kivity
2007-04-01 14:35           ` [PATCH 06/41] KVM: Use a shared page for kernel/user communication when runing a vcpu Avi Kivity
2007-04-01 14:35             ` [PATCH 07/41] KVM: Do not communicate to userspace through cpu registers during PIO Avi Kivity
2007-04-01 14:35               ` [PATCH 08/41] KVM: Handle cpuid in the kernel instead of punting to userspace Avi Kivity
2007-04-01 14:35                 ` [PATCH 09/41] KVM: Remove the 'emulated' field from the userspace interface Avi Kivity
2007-04-01 14:35                   ` [PATCH 10/41] KVM: Remove minor wart from KVM_CREATE_VCPU ioctl Avi Kivity
2007-04-01 14:35                     ` [PATCH 11/41] KVM: Renumber ioctls Avi Kivity
2007-04-01 14:35                       ` [PATCH 12/41] KVM: Add method to check for backwards-compatible API extensions Avi Kivity
2007-04-01 14:35                         ` [PATCH 13/41] KVM: Allow userspace to process hypercalls which have no kernel handler Avi Kivity
2007-04-01 14:35                           ` [PATCH 14/41] KVM: Fold kvm_run::exit_type into kvm_run::exit_reason Avi Kivity
2007-04-01 14:35                             ` [PATCH 15/41] KVM: Add a special exit reason when exiting due to an interrupt Avi Kivity
2007-04-01 14:35                               ` [PATCH 16/41] KVM: Initialize the apic_base msr on svm too Avi Kivity
2007-04-01 14:35                                 ` [PATCH 17/41] KVM: Add guest mode signal mask Avi Kivity
2007-04-01 14:35                                   ` [PATCH 18/41] KVM: Allow kernel to select size of mmap() buffer Avi Kivity
2007-04-01 14:35                                     ` [PATCH 19/41] KVM: Future-proof argument-less ioctls Avi Kivity
2007-04-01 14:35                                       ` [PATCH 20/41] KVM: Avoid guest virtual addresses in string pio userspace interface Avi Kivity
2007-04-01 14:35                                         ` [PATCH 21/41] KVM: MMU: Remove unnecessary check for pdptr access Avi Kivity
2007-04-01 14:35                                           ` [PATCH 22/41] KVM: MMU: Remove global pte tracking Avi Kivity
2007-04-01 14:35                                             ` [PATCH 23/41] KVM: Workaround vmx inability to virtualize the reset state Avi Kivity
2007-04-01 14:35                                               ` [PATCH 24/41] KVM: Remove set_cr0_no_modeswitch() arch op Avi Kivity
2007-04-01 14:35                                                 ` [PATCH 25/41] KVM: Modify guest segments after potentially switching modes Avi Kivity
2007-04-01 14:35                                                   ` [PATCH 26/41] KVM: Hack real-mode segments on vmx from KVM_SET_SREGS Avi Kivity
2007-04-01 14:35                                                     ` Avi Kivity [this message]
2007-04-01 14:35                                                       ` [PATCH 28/41] KVM: Remove unused and write-only variables Avi Kivity
2007-04-01 14:35                                                         ` [PATCH 29/41] KVM: Handle writes to MCG_STATUS msr Avi Kivity
2007-04-01 14:35                                                           ` [PATCH 30/41] KVM: SVM: forbid guest to execute monitor/mwait Avi Kivity
2007-04-01 14:35                                                             ` [PATCH 31/41] KVM: MMU: Fix hugepage pdes mapping same physical address with different access Avi Kivity
2007-04-01 14:35                                                               ` [PATCH 32/41] KVM: SVM: Ensure timestamp counter monotonicity Avi Kivity
2007-04-01 14:35                                                                 ` [PATCH 33/41] KVM: Remove unused function Avi Kivity
2007-04-01 14:35                                                                   ` [PATCH 34/41] KVM: Use list_move() Avi Kivity
2007-04-01 14:35                                                                     ` [PATCH 35/41] KVM: Remove debug message Avi Kivity
2007-04-01 14:35                                                                       ` [PATCH 36/41] KVM: x86 emulator: fix bit string operations operand size Avi Kivity
2007-04-01 14:35                                                                         ` [PATCH 37/41] KVM: Add mmu cache clear function Avi Kivity
2007-04-01 14:35                                                                           ` [PATCH 38/41] KVM: Simply gfn_to_page() Avi Kivity
2007-04-01 14:35                                                                             ` [PATCH 39/41] KVM: Add physical memory aliasing feature Avi Kivity
2007-04-01 14:35                                                                               ` [PATCH 40/41] KVM: Add fpu get/set operations Avi Kivity
2007-04-01 14:35                                                                                 ` [PATCH 41/41] KVM: SVM: enable LBRV virtualization if available Avi Kivity

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