kvm_guest_cpu_offline() tries to disable kvmclock regardless if it is
present in the VM. It leads to write to a MSR that doesn't exist on some
configurations, namely in TDX guest:
unchecked MSR access error: WRMSR to 0x12 (tried to write 0x0000000000000000)
at rIP: 0xffffffff8110687c (kvmclock_disable+0x1c/0x30)
kvmclock enabling is gated by CLOCKSOURCE and CLOCKSOURCE2 KVM paravirt
features.
Do not disable kvmclock if it was not enabled.
Signed-off-by: Kirill A. Shutemov <email address hidden>
Fixes: c02027b5742b ("x86/kvm: Disable kvmclock on all CPUs on shutdown")
Reviewed-by: Sean Christopherson <email address hidden>
Reviewed-by: Vitaly Kuznetsov <email address hidden>
Cc: Paolo Bonzini <email address hidden>
Cc: Wanpeng Li <email address hidden>
Cc: <email address hidden>
Message-Id: <email address hidden>
Signed-off-by: Paolo Bonzini <email address hidden>
(cherry picked from commit 1c6d984f523f67ecfad1083bb04c55d91977bb15)
Signed-off-by: John Cabaj <email address hidden>
Acked-by: Philip Cox <email address hidden>
Acked-by: Tim Gardner <email address hidden>
Signed-off-by: John Cabaj <email address hidden>