diff options
| author | Brendan Jackman <jackmanb@google.com> | 2025-11-13 15:37:46 -0800 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2025-11-18 16:22:45 -0800 |
| commit | 38ee66cb1845dbf1e97c5e5d3db01ae4513f66a9 (patch) | |
| tree | 3f8a4ebe7cffceb54efd3a01de1fd5139d4d54dc /arch/x86/include | |
| parent | 05bd63959a9d682e5e765f950bb6b356d3d6d27a (diff) | |
KVM: x86: Unify L1TF flushing under per-CPU variable
Currently the tracking of the need to flush L1D for L1TF is tracked by
two bits: one per-CPU and one per-vCPU.
The per-vCPU bit is always set when the vCPU shows up on a core, so
there is no interesting state that's truly per-vCPU. Indeed, this is a
requirement, since L1D is a part of the physical CPU.
So simplify this by combining the two bits.
The vCPU bit was being written from preemption-enabled regions. To play
nice with those cases, wrap all calls from KVM and use a raw write so that
request a flush with preemption enabled doesn't trigger what would
effectively be DEBUG_PREEMPT false positives. Preemption doesn't need to
be disabled, as kvm_arch_vcpu_load() will mark the new CPU as needing a
flush if the vCPU task is migrated, or if userspace runs the vCPU on a
different task.
Signed-off-by: Brendan Jackman <jackmanb@google.com>
[sean: put raw write in KVM instead of in a hardirq.h variant]
Link: https://patch.msgid.link/20251113233746.1703361-10-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86/include')
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 692ec922945f..103af57e1060 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1055,9 +1055,6 @@ struct kvm_vcpu_arch { /* be preempted when it's in kernel-mode(cpl=0) */ bool preempted_in_kernel; - /* Flush the L1 Data cache for L1TF mitigation on VMENTER */ - bool l1tf_flush_l1d; - /* Host CPU on which VM-entry was most recently attempted */ int last_vmentry_cpu; |