WARN_ON(!svm->tsc_scaling_enabled)

[Dāvis Mosāns <davispuh@xxxxxxxxx>]

Hi,

I'm using:

kvm ignore_msrs=1
kvm_amd nested=1

invtsc=on
tsc-deadline=on
tsc-scale=off
svm=on

and my dmesg gets spammed with warnings like every second.
Also sometimes guest VM freezes when booting.


if (svm->tsc_ratio_msr != kvm_default_tsc_scaling_ratio) {
    WARN_ON(!svm->tsc_scaling_enabled);
    nested_svm_update_tsc_ratio_msr(vcpu);
}

WARNING: CPU: 6 PID: 21336 at arch/x86/kvm/svm/nested.c:582
nested_vmcb02_prepare_control (arch/x86/kvm/svm/nested.c:582
(discriminator 1)) kvm_amd
RIP: 0010:nested_vmcb02_prepare_control (arch/x86/kvm/svm/nested.c:582
(discriminator 1)) kvm_amd
Call Trace:
 <TASK>
enter_svm_guest_mode (arch/x86/kvm/svm/nested.c:480 (discriminator 3)
arch/x86/kvm/svm/nested.c:491 (discriminator 3)
arch/x86/kvm/svm/nested.c:647 (discriminator 3)) kvm_amd
nested_svm_vmrun (arch/x86/kvm/svm/nested.c:726) kvm_amd
kvm_arch_vcpu_ioctl_run (arch/x86/kvm/x86.c:10243 arch/x86/kvm/x86.c:10449) kvm
kvm_vcpu_ioctl (arch/x86/kvm/../../../virt/kvm/kvm_main.c:3908) kvm
__x64_sys_ioctl (fs/ioctl.c:52 fs/ioctl.c:874 fs/ioctl.c:860 fs/ioctl.c:860)
do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)
? kvm_on_user_return (./arch/x86/include/asm/paravirt.h:194
./arch/x86/include/asm/paravirt.h:227 arch/x86/kvm/x86.c:370) kvm
? fire_user_return_notifiers (kernel/user-return-notifier.c:42
(discriminator 11))
? exit_to_user_mode_prepare (./arch/x86/include/asm/entry-common.h:53
kernel/entry/common.c:209)
? syscall_exit_to_user_mode (./arch/x86/include/asm/jump_label.h:55
./arch/x86/include/asm/nospec-branch.h:302
./arch/x86/include/asm/entry-common.h:94 kernel/entry/common.c:131
kernel/entry/common.c:302)
? do_syscall_64 (arch/x86/entry/common.c:87)

Maybe this warning is wrong?

Best regards,
Dāvis