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>
