On Tue, Dec 12, 2023, Kirill A. Shutemov wrote:
> 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.shutemov@xxxxxxxxxxxxxxx>
> > Fixes: c02027b5742b ("x86/kvm: Disable kvmclock on all CPUs on shutdown")
> > Reviewed-by: Sean Christopherson <seanjc@xxxxxxxxxx>
> > Reviewed-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
> > Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> > Cc: Wanpeng Li <wanpengli@xxxxxxxxxxx>
>
> 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.
Paolo is going to grab this (possibly for 6.7-rc?). I'll keep this tagged on my
end in case that doesn't happen "soon".
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