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Date: Wed, 31 Mar 2021 17:08:40 +0200 From: Paolo Bonzini <pbonzini@...hat.com> To: Vitaly Kuznetsov <vkuznets@...hat.com>, kvm@...r.kernel.org Cc: Sean Christopherson <seanjc@...gle.com>, Wanpeng Li <wanpengli@...cent.com>, Jim Mattson <jmattson@...gle.com>, Marcelo Tosatti <mtosatti@...hat.com>, linux-kernel@...r.kernel.org Subject: Re: [PATCH v3 0/2] KVM: x86: hyper-v: Fix TSC page update after KVM_SET_CLOCK(0) call 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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