[PATCH v3 0/3] KVM/x86: Enhancements to static calls

Wei Wang
2024-04-25T12:52:57Z

This patchset introduces the KVM_X86_CALL() and KVM_PMU_CALL() macros to
streamline the usage of static calls of kvm_x86_ops and kvm_pmu_ops. The
current static_call() usage is a bit verbose and can lead to code
alignment challenges, and the addition of kvm_x86_ prefix to hooks at the
static_call() sites hinders code readability and navigation. The use of
static_call_cond() is essentially the same as static_call() on x86, so it
is replaced by static_call() to simplify the code. The changes have gone
through my tests (guest launch, a few vPMU tests, live migration tests)
without an issue.

v2->v3 changes:
- Change the KVM_X86_CALL() definition to have the parameters in their
owen paratheses.
- Update the .get_cpl() hook in pmu.c to use KVM_X86_CALL().
(it was omitted in v2)

v1->v2 changes:
- Replace static_call_cond() with static_call()
- Rename KVM_X86_SC to KVM_X86_CALL, and updated all the call sites
- Add KVM_PMU_CALL()
- Add patch 4 and 5 to review the idea of removing KVM_X86_OP_OPTIONAL

Wei Wang (3):
KVM: x86: Replace static_call_cond() with static_call()
KVM: x86: Introduce KVM_X86_CALL() to simplify static calls of
kvm_x86_ops
KVM: x86/pmu: Add KVM_PMU_CALL() to simplify static calls of
kvm_pmu_ops

arch/x86/include/asm/kvm_host.h | 11 +-
arch/x86/kvm/cpuid.c | 2 +-
arch/x86/kvm/hyperv.c | 6 +-
arch/x86/kvm/irq.c | 2 +-
arch/x86/kvm/kvm_cache_regs.h | 10 +-
arch/x86/kvm/lapic.c | 42 +++--
arch/x86/kvm/lapic.h | 2 +-
arch/x86/kvm/mmu.h | 6 +-
arch/x86/kvm/mmu/mmu.c | 4 +-
arch/x86/kvm/mmu/spte.c | 4 +-
arch/x86/kvm/pmu.c | 29 +--
arch/x86/kvm/smm.c | 44 ++---
arch/x86/kvm/trace.h | 15 +-
arch/x86/kvm/x86.c | 322 ++++++++++++++++----------------
arch/x86/kvm/x86.h | 2 +-
arch/x86/kvm/xen.c | 4 +-
16 files changed, 259 insertions(+), 246 deletions(-)

base-commit: 44ecfa3e5f1ce2b5c7fa7003abde8a667c158f88
--
2.27.0