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| author | Sean Christopherson <seanjc@google.com> | 2025-08-05 12:05:26 -0700 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2025-08-19 11:59:43 -0700 |
| commit | 6c3d4b917995a17f515943ccd39ba11b81753b0d (patch) | |
| tree | 2f9cae00847b25aab8909b7de6963b41933b3e19 /arch/x86/kvm/x86.c | |
| parent | KVM: x86: Push acquisition of SRCU in fastpath into kvm_pmu_trigger_event() (diff) | |
| download | linux-6c3d4b917995a17f515943ccd39ba11b81753b0d.tar.gz linux-6c3d4b917995a17f515943ccd39ba11b81753b0d.zip | |
KVM: x86: Add a fastpath handler for INVD
Add a fastpath handler for INVD so that the common fastpath logic can be
trivially tested on both Intel and AMD. Under KVM, INVD is always:
(a) intercepted, (b) available to the guest, and (c) emulated as a nop,
with no side effects. Combined with INVD not having any inputs or outputs,
i.e. no register constraints, INVD is the perfect instruction for
exercising KVM's fastpath as it can be inserted into practically any
guest-side code stream.
Link: https://lore.kernel.org/r/20250805190526.1453366-19-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 093bfc8d00b3..6e56d5cff44d 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2087,6 +2087,15 @@ int kvm_emulate_invd(struct kvm_vcpu *vcpu) } EXPORT_SYMBOL_GPL(kvm_emulate_invd); +fastpath_t handle_fastpath_invd(struct kvm_vcpu *vcpu) +{ + if (!kvm_emulate_invd(vcpu)) + return EXIT_FASTPATH_EXIT_USERSPACE; + + return EXIT_FASTPATH_REENTER_GUEST; +} +EXPORT_SYMBOL_GPL(handle_fastpath_invd); + int kvm_handle_invalid_op(struct kvm_vcpu *vcpu) { kvm_queue_exception(vcpu, UD_VECTOR); |