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Old 06-06-2011, 05:27 PM
Marcelo Tosatti
 
Default KVM: VMX: do not overwrite uptodate vcpu->arch.cr3 on KVM_SET_SREGS

Only decache guest CR3 value if vcpu->arch.cr3 is stale.
Fixes loadvm with live guest.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Tested-by: Markus Schade <markus.schade@gmail.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
(cherry picked from commit 5233dd51ece1615d54ab96c4cbe9ac3cc595e955)

BugLink: http://launchpad.net/bugs/1018440

Signed-off-by: Chris J Arges <chris.j.arges@canonical.com>
---
arch/x86/kvm/vmx.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 3aad96c..51abe43 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1924,7 +1924,8 @@ static void ept_update_paging_mode_cr0(unsigned long *hw_cr0,
unsigned long cr0,
struct kvm_vcpu *vcpu)
{
- vmx_decache_cr3(vcpu);
+ if (!test_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail))
+ vmx_decache_cr3(vcpu);
if (!(cr0 & X86_CR0_PG)) {
/* From paging/starting to nonpaging */
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
--
1.7.9.5


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