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Date: Sat, 19 Nov 2022 01:34:47 +0000
From: Sean Christopherson <seanjc@...gle.com>
To: Yury Norov <yury.norov@...il.com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Marc Zyngier <maz@...nel.org>,
Paolo Bonzini <pbonzini@...hat.com>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Rasmus Villemoes <linux@...musvillemoes.dk>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
James Morse <james.morse@....com>,
Alexandru Elisei <alexandru.elisei@....com>,
Suzuki K Poulose <suzuki.poulose@....com>,
Oliver Upton <oliver.upton@...ux.dev>,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org,
Sean Christopherson <seanjc@...gle.com>
Subject: [PATCH 6/9] KVM: selftests: Use non-atomic clear/set bit helpers in
KVM tests
Use the dedicated non-atomic helpers for {clear,set}_bit() and their
test variants, i.e. the double-underscore versions. Depsite being
defined in atomic.h, and despite the kernel versions being atomic in the
kernel, tools' {clear,set}_bit() helpers aren't actually atomic. Move
to the double-underscore versions so that the versions that are expected
to be atomic (for kernel developers) can be made atomic without affecting
users that don't want atomic operations.
Leave the usage in ucall_free() as-is, it's the one place in tools/ that
actually wants/needs atomic behavior.
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
.../selftests/kvm/aarch64/arch_timer.c | 2 +-
tools/testing/selftests/kvm/dirty_log_test.c | 34 +++++++++----------
.../selftests/kvm/x86_64/hyperv_evmcs.c | 4 +--
.../selftests/kvm/x86_64/hyperv_svm_test.c | 4 +--
4 files changed, 22 insertions(+), 22 deletions(-)
diff --git a/tools/testing/selftests/kvm/aarch64/arch_timer.c b/tools/testing/selftests/kvm/aarch64/arch_timer.c
index f2a96779716a..26556a266021 100644
--- a/tools/testing/selftests/kvm/aarch64/arch_timer.c
+++ b/tools/testing/selftests/kvm/aarch64/arch_timer.c
@@ -222,7 +222,7 @@ static void *test_vcpu_run(void *arg)
/* Currently, any exit from guest is an indication of completion */
pthread_mutex_lock(&vcpu_done_map_lock);
- set_bit(vcpu_idx, vcpu_done_map);
+ __set_bit(vcpu_idx, vcpu_done_map);
pthread_mutex_unlock(&vcpu_done_map_lock);
switch (get_ucall(vcpu, &uc)) {
diff --git a/tools/testing/selftests/kvm/dirty_log_test.c b/tools/testing/selftests/kvm/dirty_log_test.c
index a38c4369fb8e..a75548865f6b 100644
--- a/tools/testing/selftests/kvm/dirty_log_test.c
+++ b/tools/testing/selftests/kvm/dirty_log_test.c
@@ -44,20 +44,20 @@
# define BITOP_LE_SWIZZLE ((BITS_PER_LONG-1) & ~0x7)
# define test_bit_le(nr, addr) \
test_bit((nr) ^ BITOP_LE_SWIZZLE, addr)
-# define set_bit_le(nr, addr) \
- set_bit((nr) ^ BITOP_LE_SWIZZLE, addr)
-# define clear_bit_le(nr, addr) \
- clear_bit((nr) ^ BITOP_LE_SWIZZLE, addr)
-# define test_and_set_bit_le(nr, addr) \
- test_and_set_bit((nr) ^ BITOP_LE_SWIZZLE, addr)
-# define test_and_clear_bit_le(nr, addr) \
- test_and_clear_bit((nr) ^ BITOP_LE_SWIZZLE, addr)
+# define __set_bit_le(nr, addr) \
+ __set_bit((nr) ^ BITOP_LE_SWIZZLE, addr)
+# define __clear_bit_le(nr, addr) \
+ __clear_bit((nr) ^ BITOP_LE_SWIZZLE, addr)
+# define __test_and_set_bit_le(nr, addr) \
+ __test_and_set_bit((nr) ^ BITOP_LE_SWIZZLE, addr)
+# define __test_and_clear_bit_le(nr, addr) \
+ __test_and_clear_bit((nr) ^ BITOP_LE_SWIZZLE, addr)
#else
-# define test_bit_le test_bit
-# define set_bit_le set_bit
-# define clear_bit_le clear_bit
-# define test_and_set_bit_le test_and_set_bit
-# define test_and_clear_bit_le test_and_clear_bit
+# define test_bit_le test_bit
+# define __set_bit_le __set_bit
+# define __clear_bit_le __clear_bit
+# define __test_and_set_bit_le __test_and_set_bit
+# define __test_and_clear_bit_le __test_and_clear_bit
#endif
#define TEST_DIRTY_RING_COUNT 65536
@@ -305,7 +305,7 @@ static uint32_t dirty_ring_collect_one(struct kvm_dirty_gfn *dirty_gfns,
TEST_ASSERT(cur->offset < num_pages, "Offset overflow: "
"0x%llx >= 0x%x", cur->offset, num_pages);
//pr_info("fetch 0x%x page %llu\n", *fetch_index, cur->offset);
- set_bit_le(cur->offset, bitmap);
+ __set_bit_le(cur->offset, bitmap);
dirty_ring_last_page = cur->offset;
dirty_gfn_set_collected(cur);
(*fetch_index)++;
@@ -560,7 +560,7 @@ static void vm_dirty_log_verify(enum vm_guest_mode mode, unsigned long *bmap)
value_ptr = host_test_mem + page * host_page_size;
/* If this is a special page that we were tracking... */
- if (test_and_clear_bit_le(page, host_bmap_track)) {
+ if (__test_and_clear_bit_le(page, host_bmap_track)) {
host_track_next_count++;
TEST_ASSERT(test_bit_le(page, bmap),
"Page %"PRIu64" should have its dirty bit "
@@ -568,7 +568,7 @@ static void vm_dirty_log_verify(enum vm_guest_mode mode, unsigned long *bmap)
page);
}
- if (test_and_clear_bit_le(page, bmap)) {
+ if (__test_and_clear_bit_le(page, bmap)) {
bool matched;
host_dirty_count++;
@@ -661,7 +661,7 @@ static void vm_dirty_log_verify(enum vm_guest_mode mode, unsigned long *bmap)
* should report its dirtyness in the
* next run
*/
- set_bit_le(page, host_bmap_track);
+ __set_bit_le(page, host_bmap_track);
}
}
}
diff --git a/tools/testing/selftests/kvm/x86_64/hyperv_evmcs.c b/tools/testing/selftests/kvm/x86_64/hyperv_evmcs.c
index ea58e5b436e8..ab51865c80be 100644
--- a/tools/testing/selftests/kvm/x86_64/hyperv_evmcs.c
+++ b/tools/testing/selftests/kvm/x86_64/hyperv_evmcs.c
@@ -142,7 +142,7 @@ void guest_code(struct vmx_pages *vmx_pages, struct hyperv_test_pages *hv_pages,
/* Intercept RDMSR 0xc0000100 */
vmwrite(CPU_BASED_VM_EXEC_CONTROL, vmreadz(CPU_BASED_VM_EXEC_CONTROL) |
CPU_BASED_USE_MSR_BITMAPS);
- set_bit(MSR_FS_BASE & 0x1fff, vmx_pages->msr + 0x400);
+ __set_bit(MSR_FS_BASE & 0x1fff, vmx_pages->msr + 0x400);
GUEST_ASSERT(!vmresume());
GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_MSR_READ);
current_evmcs->guest_rip += 2; /* rdmsr */
@@ -154,7 +154,7 @@ void guest_code(struct vmx_pages *vmx_pages, struct hyperv_test_pages *hv_pages,
current_evmcs->guest_rip += 2; /* rdmsr */
/* Intercept RDMSR 0xc0000101 without telling KVM about it */
- set_bit(MSR_GS_BASE & 0x1fff, vmx_pages->msr + 0x400);
+ __set_bit(MSR_GS_BASE & 0x1fff, vmx_pages->msr + 0x400);
/* Make sure HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP is set */
current_evmcs->hv_clean_fields |= HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP;
GUEST_ASSERT(!vmresume());
diff --git a/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c b/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c
index 3b3cc94ba8e4..68a7d354ea07 100644
--- a/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c
+++ b/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c
@@ -103,7 +103,7 @@ static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm,
/* Intercept RDMSR 0xc0000100 */
vmcb->control.intercept |= 1ULL << INTERCEPT_MSR_PROT;
- set_bit(2 * (MSR_FS_BASE & 0x1fff), svm->msr + 0x800);
+ __set_bit(2 * (MSR_FS_BASE & 0x1fff), svm->msr + 0x800);
run_guest(vmcb, svm->vmcb_gpa);
GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_MSR);
vmcb->save.rip += 2; /* rdmsr */
@@ -115,7 +115,7 @@ static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm,
vmcb->save.rip += 2; /* rdmsr */
/* Intercept RDMSR 0xc0000101 without telling KVM about it */
- set_bit(2 * (MSR_GS_BASE & 0x1fff), svm->msr + 0x800);
+ __set_bit(2 * (MSR_GS_BASE & 0x1fff), svm->msr + 0x800);
/* Make sure HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP is set */
vmcb->control.clean |= HV_VMCB_NESTED_ENLIGHTENMENTS;
run_guest(vmcb, svm->vmcb_gpa);
--
2.38.1.584.g0f3c55d4c2-goog
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