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SubjectRe: [PATCH v3 0/2] KVM: x86: hyper-v: Fix TSC page update after KVM_SET_CLOCK(0) call
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On 31/03/21 14:41, Vitaly Kuznetsov wrote:
> Changes since v2:
> - Fix the issue by using master_kernel_ns/get_kvmclock_base_ns() instead of
> get_kvmclock_ns() when handling KVM_SET_CLOCK.
> - Rebase on Paolo's "KVM: x86: fix lockdep splat due to Xen runstate
> update" series and use spin_lock_irq()/spin_unlock_irq() [Paolo]
>
> Original description:
>
> I discovered that after KVM_SET_CLOCK(0) TSC page value in the guest can
> go through the roof and apparently we have a signedness issue when the
> update is performed. Fix the issue and add a selftest.
>
> Vitaly Kuznetsov (2):
> KVM: x86: Prevent 'hv_clock->system_time' from going negative in
> kvm_guest_time_update()
> selftests: kvm: Check that TSC page value is small after
> KVM_SET_CLOCK(0)
>
> arch/x86/kvm/x86.c | 19 +++++++++++++++++--
> .../selftests/kvm/x86_64/hyperv_clock.c | 13 +++++++++++--
> 2 files changed, 28 insertions(+), 4 deletions(-)
>

Queued, thanks.

Paolo

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