Re: [kvm-unit-tests PATCH v2 2/4] nVMX: Validate DEBUGCTLMSR_BUS_LOCK_DETECT states during VMX transitions

[Sean Christopherson <seanjc@google.com>]

On Wed, May 27, 2026, Xiaoyao Li wrote:
> On 5/27/2026 10:58 PM, Sean Christopherson wrote:
> > On Wed, May 27, 2026, Chenyi Qiang wrote:
> > > On 5/26/2026 8:32 PM, Xiaoyao Li wrote:
> > > > On 5/26/2026 11:16 AM, Chenyi Qiang wrote:
> > > > > diff --git a/x86/unittests.cfg b/x86/unittests.cfg
> > > > > index 48835eba..c8426770 100644
> > > > > --- a/x86/unittests.cfg
> > > > > +++ b/x86/unittests.cfg
> > > > > @@ -471,6 +471,14 @@ arch = x86_64
> > > > >    groups = vmx
> > > > >    timeout = 240
> > > > >    +[vmx_bus_lock_detect_test]
> > > > > +file = vmx.flat
> > > > > +test_args = "vmx_bus_lock_detect_test"
> > > > > +qemu_params = -cpu max,+vmx
> > > > > +arch = x86_64
> > > > > +groups = vmx
> > > > > +timeout = 240
> > 
> > Why does this need a separate config, and with a massive timeout?  This should
> > be nearly instantaneous, no?
> > 
> > Ugh, because you copy+pasted vmx_cet.  That thing doesn't need to exist, the
> > testcase is run by the common "vmx" entry.  I'll send a patch to drop vmx_cet.
> 
> I told Chenyi that to actually be able to test LBR bit, we might need some
> specific QEMU configuration to enable PMU and legacy LBR and it will need a
> specific config.

Ah.  AFAICT, it's just the migratable=no thing?  If so, any reason we can't do
that for the main "vmx" testcase?

diff --git x86/unittests.cfg x86/unittests.cfg
index 48835eba..fad58255 100644
--- x86/unittests.cfg
+++ x86/unittests.cfg
@@ -320,7 +320,7 @@ qemu_params = -cpu max,host-phys-bits
 [vmx]
 file = vmx.flat
 test_args = "-exit_monitor_from_l2_test -ept_access* -vmx_smp* -vmx_vmcs_shadow_test -atomic_switch_overflow_msrs_test -vmx_init_signal_test -vmx_apic_passthrough_tpr_threshold_test -apic_reg_virt_test -virt_x2apic_mode_test -vmx_pf_exception_test -vmx_pf_exception_forced_emulation_test -vmx_pf_no_vpid_test -vmx_pf_invvpid_test -vmx_pf_vpid_test -vmx_basic_vid_test -vmx_eoi_virt_test -vmx_posted_interrupts_test"
-qemu_params = -cpu max,+vmx
+qemu_params = -cpu max,migratable=no,+vmx
 arch = x86_64
 groups = vmx