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| author | Radim Krčmář <rkrcmar@redhat.com> | 2015-03-17 14:02:32 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-04-29 10:23:45 +0200 |
| commit | 1b4137224d2c2a5201606d8f1acabd3d28668499 (patch) | |
| tree | 89f59658242ec2c217b73b502698bc1677ee372e | |
| parent | edc7cc6c53c6aecbf493eabd7b8cf37f3eef6ea7 (diff) | |
| download | lwn-1b4137224d2c2a5201606d8f1acabd3d28668499.tar.gz lwn-1b4137224d2c2a5201606d8f1acabd3d28668499.zip | |
KVM: nVMX: mask unrestricted_guest if disabled on L0
commit 0790ec172de1bd2e23f1dbd4925426b6cc3c1b72 upstream.
If EPT was enabled, unrestricted_guest was allowed in L1 regardless of
L0. L1 triple faulted when running L2 guest that required emulation.
Another side effect was 'WARN_ON_ONCE(vmx->nested.nested_run_pending)'
in L0's dmesg:
WARNING: CPU: 0 PID: 0 at arch/x86/kvm/vmx.c:9190 nested_vmx_vmexit+0x96e/0xb00 [kvm_intel] ()
Prevent this scenario by masking SECONDARY_EXEC_UNRESTRICTED_GUEST when
the host doesn't have it enabled.
Fixes: 78051e3b7e35 ("KVM: nVMX: Disable unrestricted mode if ept=0")
Cc: stable@vger.kernel.org
Tested-By: Kashyap Chamarthy <kchamart@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/x86/kvm/vmx.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index d4c58d884838..312446418b36 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -2404,8 +2404,7 @@ static __init void nested_vmx_setup_ctls_msrs(void) if (enable_ept) { /* nested EPT: emulate EPT also to L1 */ - nested_vmx_secondary_ctls_high |= SECONDARY_EXEC_ENABLE_EPT | - SECONDARY_EXEC_UNRESTRICTED_GUEST; + nested_vmx_secondary_ctls_high |= SECONDARY_EXEC_ENABLE_EPT; nested_vmx_ept_caps = VMX_EPT_PAGE_WALK_4_BIT | VMX_EPTP_WB_BIT | VMX_EPT_2MB_PAGE_BIT | VMX_EPT_INVEPT_BIT; @@ -2419,6 +2418,10 @@ static __init void nested_vmx_setup_ctls_msrs(void) } else nested_vmx_ept_caps = 0; + if (enable_unrestricted_guest) + nested_vmx_secondary_ctls_high |= + SECONDARY_EXEC_UNRESTRICTED_GUEST; + /* miscellaneous data */ rdmsr(MSR_IA32_VMX_MISC, nested_vmx_misc_low, nested_vmx_misc_high); nested_vmx_misc_low &= VMX_MISC_SAVE_EFER_LMA; |