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| author | Lei Chen <lei.chen@smartx.com> | 2026-04-09 22:22:26 +0800 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2026-05-13 09:57:44 -0700 |
| commit | 8fe2e698fce4a95a3ac2c25fe59832a3c22534c6 (patch) | |
| tree | 671c5ff5dea470c32030bc69f208522cdac1fd0d /include/linux/ptp_clock_kernel.h | |
| parent | fff82ea9d900b6bbebc58d34b7a63789de1ad10d (diff) | |
KVM: x86: Rate-limit global clock updates on vCPU load
commit 446fcce2a52b ("Revert "x86: kvm: rate-limit global clock updates"")
dropped the rate limiting for KVM_REQ_GLOBAL_CLOCK_UPDATE.
As a result, kvm_arch_vcpu_load() can queue global clock update requests
every time a vCPU is scheduled when the master clock is disabled or when
the vCPU is loaded for the first time.
Restore the throttling with a per-VM ratelimit state and gate
KVM_REQ_GLOBAL_CLOCK_UPDATE through __ratelimit(), so frequent vCPU
scheduling does not generate a steady stream of redundant clock update
requests.
Fixes: 446fcce2a52b ("Revert "x86: kvm: rate-limit global clock updates"")
Signed-off-by: Lei Chen <lei.chen@smartx.com>
Reported-by: Jaroslav Pulchart <jaroslav.pulchart@gooddata.com>
Closes: https://lore.kernel.org/all/CAK8fFZ5gY8_Mw2A=iZVFNVKQNrXQzVsn-HTd+Me9K6ZfmdgA+Q@mail.gmail.com/
Link: https://patch.msgid.link/20260409142226.2581-1-lei.chen@smartx.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'include/linux/ptp_clock_kernel.h')
0 files changed, 0 insertions, 0 deletions