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On 18/04/2024 20:34, David Woodhouse wrote:
From: David Woodhouse <dwmw@xxxxxxxxxxxx>

This was introduced in commit 0061d53daf26 ("KVM: x86: limit difference
between kvmclock updates") to reduce cross-vCPU differences which arose
because the KVM clock was based on CLOCK_MONOTONIC and thus subject to
NTP frequency corrections.

However, commit 53fafdbb8b21 ("KVM: x86: switch KVMCLOCK base to
monotonic raw clock") switched to using CLOCK_MONOTONIC_RAW as the basis
for the KVM clock, avoiding the NTP frequency skew altogether.

So remove KVM_REQ_GLOBAL_CLOCK_UPDATE. In kvm_write_system_time(), all
that's needed is a single KVM_REQ_CLOCK_UPDATE for the vCPU whose KVM
clock is being configured.

Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
  arch/x86/include/asm/kvm_host.h |  2 +-
  arch/x86/kvm/x86.c              | 57 ++-------------------------------
  2 files changed, 4 insertions(+), 55 deletions(-)

Reviewed-by: Paul Durrant <paul@xxxxxxx>

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