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Message-ID: <20241220013906.3518334-9-seanjc@google.com>
Date: Thu, 19 Dec 2024 17:39:06 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>,
Anup Patel <anup@...infault.org>, Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
Christian Borntraeger <borntraeger@...ux.ibm.com>, Janosch Frank <frankja@...ux.ibm.com>,
Claudio Imbrenda <imbrenda@...ux.ibm.com>, Sean Christopherson <seanjc@...gle.com>,
Paolo Bonzini <pbonzini@...hat.com>
Cc: linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org,
linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 8/8] KVM: selftests: Add compile-time assertions to guard
against stats typos
Add compile-time assertions to the main binary stats accessor to verify
the stat is a known KVM stat of the appropriate scope, and "add" all
known stats for all architectures.
To build the set of known stats, define enums for each stat, with a
completely arbitrary magic value to specify the scope of the stat. With
the assert in place, misuse of stat (or usage of a new stat) generates
error like so:
In file included from include/x86/kvm_util_arch.h:8,
from include/kvm_util.h:23,
from x86/dirty_log_page_splitting_test.c:16:
x86/dirty_log_page_splitting_test.c: In function ‘get_page_stats’:
include/kvm_util.h:563:42: error: ‘VM_STAT_pages_4m’ undeclared
(first use in this function); did you mean ‘VM_STAT_pages_2m’?
563 | #define vm_get_stat(vm, stat) __get_stat(VM, &(vm)->stats, stat)
| ^~
...
x86/dirty_log_page_splitting_test.c:45:27: note: in expansion of macro ‘vm_get_stat’
45 | stats->pages_2m = vm_get_stat(vm, pages_4m);
| ^~~~~~~~~~~
Using pre-defined lists of stats doesn't completely eliminate human error,
e.g. it's obviously possible to make a typo when adding a state. And
while there is also a non-zero cost to maintaining the set of stats,
adding stats in KVM is relatively uncommon, and removing stats is extremely
rare. On the flip side, providing a list of known stats should make it
easier to use stats in test, at which point detecting goofs at compile-time
will also be more valuable.
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
.../kvm/include/arm64/kvm_util_arch.h | 12 ++
.../testing/selftests/kvm/include/kvm_util.h | 24 +++-
.../selftests/kvm/include/kvm_util_types.h | 6 +
.../kvm/include/riscv/kvm_util_arch.h | 14 +++
.../kvm/include/s390/kvm_util_arch.h | 113 ++++++++++++++++++
.../selftests/kvm/include/x86/kvm_util_arch.h | 52 ++++++++
6 files changed, 218 insertions(+), 3 deletions(-)
diff --git a/tools/testing/selftests/kvm/include/arm64/kvm_util_arch.h b/tools/testing/selftests/kvm/include/arm64/kvm_util_arch.h
index e43a57d99b56..12097262f585 100644
--- a/tools/testing/selftests/kvm/include/arm64/kvm_util_arch.h
+++ b/tools/testing/selftests/kvm/include/arm64/kvm_util_arch.h
@@ -2,6 +2,18 @@
#ifndef SELFTEST_KVM_UTIL_ARCH_H
#define SELFTEST_KVM_UTIL_ARCH_H
+#include "kvm_util_types.h"
+
struct kvm_vm_arch {};
+enum kvm_arm64_stats {
+ VCPU_STAT(hvc_exit_stat),
+ VCPU_STAT(wfe_exit_stat),
+ VCPU_STAT(wfi_exit_stat),
+ VCPU_STAT(mmio_exit_user),
+ VCPU_STAT(mmio_exit_kernel),
+ VCPU_STAT(signal_exits),
+ VCPU_STAT(exits),
+};
+
#endif // SELFTEST_KVM_UTIL_ARCH_H
diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
index e0d23873158e..f4f0e27cea27 100644
--- a/tools/testing/selftests/kvm/include/kvm_util.h
+++ b/tools/testing/selftests/kvm/include/kvm_util.h
@@ -535,19 +535,37 @@ void read_stat_data(int stats_fd, struct kvm_stats_header *header,
struct kvm_stats_desc *desc, uint64_t *data,
size_t max_elements);
+enum kvm_common_stats {
+ VM_STAT(remote_tlb_flush),
+ VM_STAT(remote_tlb_flush_requests),
+
+ VCPU_STAT(halt_successfull_poll),
+ VCPU_STAT(halt_attempted_poll),
+ VCPU_STAT(halt_poll_invalid),
+ VCPU_STAT(halt_wakeup),
+ VCPU_STAT(halt_poll_success_ns),
+ VCPU_STAT(halt_poll_fail_ns),
+ VCPU_STAT(halt_wait_ns),
+ VCPU_STAT(halt_poll_success_hist),
+ VCPU_STAT(halt_poll_fail_hist),
+ VCPU_STAT(halt_wait_hist),
+ VCPU_STAT(blocking),
+};
+
void kvm_get_stat(struct kvm_binary_stats *stats, const char *name,
uint64_t *data, size_t max_elements);
-#define __get_stat(stats, stat) \
+#define __get_stat(type, stats, stat) \
({ \
uint64_t data; \
\
+ kvm_static_assert(type##_STAT_##stat == type##_STAT_MAGIC_NUMBER); \
kvm_get_stat(stats, #stat, &data, 1); \
data; \
})
-#define vm_get_stat(vm, stat) __get_stat(&(vm)->stats, stat)
-#define vcpu_get_stat(vcpu, stat) __get_stat(&(vcpu)->stats, stat)
+#define vm_get_stat(vm, stat) __get_stat(VM, &(vm)->stats, stat)
+#define vcpu_get_stat(vcpu, stat) __get_stat(VCPU, &(vcpu)->stats, stat)
void vm_create_irqchip(struct kvm_vm *vm);
diff --git a/tools/testing/selftests/kvm/include/kvm_util_types.h b/tools/testing/selftests/kvm/include/kvm_util_types.h
index ec787b97cf18..20e6717a0d24 100644
--- a/tools/testing/selftests/kvm/include/kvm_util_types.h
+++ b/tools/testing/selftests/kvm/include/kvm_util_types.h
@@ -17,4 +17,10 @@
typedef uint64_t vm_paddr_t; /* Virtual Machine (Guest) physical address */
typedef uint64_t vm_vaddr_t; /* Virtual Machine (Guest) virtual address */
+#define VM_STAT_MAGIC_NUMBER 1
+#define VM_STAT(stat) VM_STAT_##stat = VM_STAT_MAGIC_NUMBER
+
+#define VCPU_STAT_MAGIC_NUMBER 2
+#define VCPU_STAT(stat) VCPU_STAT_##stat = VCPU_STAT_MAGIC_NUMBER
+
#endif /* SELFTEST_KVM_UTIL_TYPES_H */
diff --git a/tools/testing/selftests/kvm/include/riscv/kvm_util_arch.h b/tools/testing/selftests/kvm/include/riscv/kvm_util_arch.h
index e43a57d99b56..ea53d6aeb693 100644
--- a/tools/testing/selftests/kvm/include/riscv/kvm_util_arch.h
+++ b/tools/testing/selftests/kvm/include/riscv/kvm_util_arch.h
@@ -2,6 +2,20 @@
#ifndef SELFTEST_KVM_UTIL_ARCH_H
#define SELFTEST_KVM_UTIL_ARCH_H
+#include "kvm_util_types.h"
+
struct kvm_vm_arch {};
+enum kvm_riscv_stats {
+ VCPU_STAT(ecall_exit_stat),
+ VCPU_STAT(wfi_exit_stat),
+ VCPU_STAT(wrs_exit_stat),
+ VCPU_STAT(mmio_exit_user),
+ VCPU_STAT(mmio_exit_kernel),
+ VCPU_STAT(csr_exit_user),
+ VCPU_STAT(csr_exit_kernel),
+ VCPU_STAT(signal_exits),
+ VCPU_STAT(exits),
+};
+
#endif // SELFTEST_KVM_UTIL_ARCH_H
diff --git a/tools/testing/selftests/kvm/include/s390/kvm_util_arch.h b/tools/testing/selftests/kvm/include/s390/kvm_util_arch.h
index e43a57d99b56..64d4de333e09 100644
--- a/tools/testing/selftests/kvm/include/s390/kvm_util_arch.h
+++ b/tools/testing/selftests/kvm/include/s390/kvm_util_arch.h
@@ -2,6 +2,119 @@
#ifndef SELFTEST_KVM_UTIL_ARCH_H
#define SELFTEST_KVM_UTIL_ARCH_H
+#include "kvm_util_types.h"
+
struct kvm_vm_arch {};
+enum kvm_s390_stats {
+ VM_STAT(inject_io),
+ VM_STAT(inject_float_mchk),
+ VM_STAT(inject_pfault_done),
+ VM_STAT(inject_service_signal),
+ VM_STAT(inject_virtio),
+ VM_STAT(aen_forward),
+ VM_STAT(gmap_shadow_reuse),
+ VM_STAT(gmap_shadow_create),
+ VM_STAT(gmap_shadow_r1_entry),
+ VM_STAT(gmap_shadow_r2_entry),
+ VM_STAT(gmap_shadow_r3_entry),
+ VM_STAT(gmap_shadow_sg_entry),
+ VM_STAT(gmap_shadow_pg_entry),
+
+ VCPU_STAT(exit_userspace),
+ VCPU_STAT(exit_null),
+ VCPU_STAT(exit_external_request),
+ VCPU_STAT(exit_io_request),
+ VCPU_STAT(exit_external_interrupt),
+ VCPU_STAT(exit_stop_request),
+ VCPU_STAT(exit_validity),
+ VCPU_STAT(exit_instruction),
+ VCPU_STAT(exit_pei),
+ VCPU_STAT(halt_no_poll_steal),
+ VCPU_STAT(instruction_lctl),
+ VCPU_STAT(instruction_lctlg),
+ VCPU_STAT(instruction_stctl),
+ VCPU_STAT(instruction_stctg),
+ VCPU_STAT(exit_program_interruption),
+ VCPU_STAT(exit_instr_and_program),
+ VCPU_STAT(exit_operation_exception),
+ VCPU_STAT(deliver_ckc),
+ VCPU_STAT(deliver_cputm),
+ VCPU_STAT(deliver_external_call),
+ VCPU_STAT(deliver_emergency_signal),
+ VCPU_STAT(deliver_service_signal),
+ VCPU_STAT(deliver_virtio),
+ VCPU_STAT(deliver_stop_signal),
+ VCPU_STAT(deliver_prefix_signal),
+ VCPU_STAT(deliver_restart_signal),
+ VCPU_STAT(deliver_program),
+ VCPU_STAT(deliver_io),
+ VCPU_STAT(deliver_machine_check),
+ VCPU_STAT(exit_wait_state),
+ VCPU_STAT(inject_ckc),
+ VCPU_STAT(inject_cputm),
+ VCPU_STAT(inject_external_call),
+ VCPU_STAT(inject_emergency_signal),
+ VCPU_STAT(inject_mchk),
+ VCPU_STAT(inject_pfault_init),
+ VCPU_STAT(inject_program),
+ VCPU_STAT(inject_restart),
+ VCPU_STAT(inject_set_prefix),
+ VCPU_STAT(inject_stop_signal),
+ VCPU_STAT(instruction_epsw),
+ VCPU_STAT(instruction_gs),
+ VCPU_STAT(instruction_io_other),
+ VCPU_STAT(instruction_lpsw),
+ VCPU_STAT(instruction_lpswe),
+ VCPU_STAT(instruction_lpswey),
+ VCPU_STAT(instruction_pfmf),
+ VCPU_STAT(instruction_ptff),
+ VCPU_STAT(instruction_sck),
+ VCPU_STAT(instruction_sckpf),
+ VCPU_STAT(instruction_stidp),
+ VCPU_STAT(instruction_spx),
+ VCPU_STAT(instruction_stpx),
+ VCPU_STAT(instruction_stap),
+ VCPU_STAT(instruction_iske),
+ VCPU_STAT(instruction_ri),
+ VCPU_STAT(instruction_rrbe),
+ VCPU_STAT(instruction_sske),
+ VCPU_STAT(instruction_ipte_interlock),
+ VCPU_STAT(instruction_stsi),
+ VCPU_STAT(instruction_stfl),
+ VCPU_STAT(instruction_tb),
+ VCPU_STAT(instruction_tpi),
+ VCPU_STAT(instruction_tprot),
+ VCPU_STAT(instruction_tsch),
+ VCPU_STAT(instruction_sie),
+ VCPU_STAT(instruction_essa),
+ VCPU_STAT(instruction_sthyi),
+ VCPU_STAT(instruction_sigp_sense),
+ VCPU_STAT(instruction_sigp_sense_running),
+ VCPU_STAT(instruction_sigp_external_call),
+ VCPU_STAT(instruction_sigp_emergency),
+ VCPU_STAT(instruction_sigp_cond_emergency),
+ VCPU_STAT(instruction_sigp_start),
+ VCPU_STAT(instruction_sigp_stop),
+ VCPU_STAT(instruction_sigp_stop_store_status),
+ VCPU_STAT(instruction_sigp_store_status),
+ VCPU_STAT(instruction_sigp_store_adtl_status),
+ VCPU_STAT(instruction_sigp_arch),
+ VCPU_STAT(instruction_sigp_prefix),
+ VCPU_STAT(instruction_sigp_restart),
+ VCPU_STAT(instruction_sigp_init_cpu_reset),
+ VCPU_STAT(instruction_sigp_cpu_reset),
+ VCPU_STAT(instruction_sigp_unknown),
+ VCPU_STAT(instruction_diagnose_10),
+ VCPU_STAT(instruction_diagnose_44),
+ VCPU_STAT(instruction_diagnose_9c),
+ VCPU_STAT(diag_9c_ignored),
+ VCPU_STAT(diag_9c_forward),
+ VCPU_STAT(instruction_diagnose_258),
+ VCPU_STAT(instruction_diagnose_308),
+ VCPU_STAT(instruction_diagnose_500),
+ VCPU_STAT(instruction_diagnose_other),
+ VCPU_STAT(pfault_sync),
+};
+
#endif // SELFTEST_KVM_UTIL_ARCH_H
diff --git a/tools/testing/selftests/kvm/include/x86/kvm_util_arch.h b/tools/testing/selftests/kvm/include/x86/kvm_util_arch.h
index 972bb1c4ab4c..f9c4aedddbd0 100644
--- a/tools/testing/selftests/kvm/include/x86/kvm_util_arch.h
+++ b/tools/testing/selftests/kvm/include/x86/kvm_util_arch.h
@@ -48,4 +48,56 @@ do { \
} \
} while (0)
+enum kvm_x86_stats {
+ VM_STAT(mmu_shadow_zapped),
+ VM_STAT(mmu_pte_write),
+ VM_STAT(mmu_pde_zapped),
+ VM_STAT(mmu_flooded),
+ VM_STAT(mmu_recycled),
+ VM_STAT(mmu_cache_miss),
+ VM_STAT(mmu_unsync),
+ VM_STAT(pages_4k),
+ VM_STAT(pages_2m),
+ VM_STAT(pages_1g),
+ VM_STAT(pages),
+ VM_STAT(nx_lpage_splits),
+ VM_STAT(max_mmu_page_hash_collisions),
+ VM_STAT(max_mmu_rmap_size),
+
+ VCPU_STAT(pf_taken),
+ VCPU_STAT(pf_fixed),
+ VCPU_STAT(pf_emulate),
+ VCPU_STAT(pf_spurious),
+ VCPU_STAT(pf_fast),
+ VCPU_STAT(pf_mmio_spte_created),
+ VCPU_STAT(pf_guest),
+ VCPU_STAT(tlb_flush),
+ VCPU_STAT(invlpg),
+ VCPU_STAT(exits),
+ VCPU_STAT(io_exits),
+ VCPU_STAT(mmio_exits),
+ VCPU_STAT(signal_exits),
+ VCPU_STAT(irq_window_exits),
+ VCPU_STAT(nmi_window_exits),
+ VCPU_STAT(l1d_flush),
+ VCPU_STAT(halt_exits),
+ VCPU_STAT(request_irq_exits),
+ VCPU_STAT(irq_exits),
+ VCPU_STAT(host_state_reload),
+ VCPU_STAT(fpu_reload),
+ VCPU_STAT(insn_emulation),
+ VCPU_STAT(insn_emulation_fail),
+ VCPU_STAT(hypercalls),
+ VCPU_STAT(irq_injections),
+ VCPU_STAT(nmi_injections),
+ VCPU_STAT(req_event),
+ VCPU_STAT(nested_run),
+ VCPU_STAT(directed_yield_attempted),
+ VCPU_STAT(directed_yield_successful),
+ VCPU_STAT(preemption_reported),
+ VCPU_STAT(preemption_other),
+ VCPU_STAT(guest_mode),
+ VCPU_STAT(notify_window_exits),
+};
+
#endif // SELFTEST_KVM_UTIL_ARCH_H
--
2.47.1.613.gc27f4b7a9f-goog
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