On Thu, Jan 4, 2024 at 8:33 PM Sean Christopherson <seanjc@xxxxxxxxxx> wrote: > > A single Xen fix (of sorts) to let userspace workaround buggy guests that don't > react well to KVM setting the "stable TSC" bit in Xen PV clocks. > > The following changes since commit e9e60c82fe391d04db55a91c733df4a017c28b2f: > > selftests/kvm: fix compilation on non-x86_64 platforms (2023-11-21 11:58:25 -0500) > > are available in the Git repository at: > > https://github.com/kvm-x86/linux.git tags/kvm-x86-xen-6.8 > > for you to fetch changes up to 6d72283526090850274d065cd5d60af732cc5fc8: > > KVM x86/xen: add an override for PVCLOCK_TSC_STABLE_BIT (2023-12-07 15:52:57 -0800) Pulled, thanks. Paolo > ---------------------------------------------------------------- > KVM Xen change for 6.8: > > To workaround Xen guests that don't expect Xen PV clocks to be marked as being > based on a stable TSC, add a Xen config knob to allow userspace to opt out of > KVM setting the "TSC stable" bit in Xen PV clocks. Note, the "TSC stable" bit > was added to the PVCLOCK ABI by KVM without an ack from Xen, i.e. KVM isn't > entirely blameless for the buggy guest behavior. > > ---------------------------------------------------------------- > Paul Durrant (1): > KVM x86/xen: add an override for PVCLOCK_TSC_STABLE_BIT > > Documentation/virt/kvm/api.rst | 6 ++++++ > arch/x86/kvm/x86.c | 28 +++++++++++++++++++++++----- > arch/x86/kvm/xen.c | 9 ++++++++- > include/uapi/linux/kvm.h | 1 + > 4 files changed, 38 insertions(+), 6 deletions(-) >
