On Tue, Dec 05, 2023 at 03:45:01AM +0300, Kirill A. Shutemov wrote:
> 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 <kirill.shute...@linux.intel.com>
> Fixes: c02027b5742b ("x86/kvm: Disable kvmclock on all CPUs on shutdown")
> Reviewed-by: Sean Christopherson <sea...@google.com>
> Reviewed-by: Vitaly Kuznetsov <vkuzn...@redhat.com>
> Cc: Paolo Bonzini <pbonz...@redhat.com>
> Cc: Wanpeng Li <wanpen...@tencent.com>
Paolo, Sean, any chance you can get it in through KVM tree while the rest
of kexec patchset is pending? The problem is visible on normal reboot too.
--
Kiryl Shutsemau / Kirill A. Shutemov
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