linux-kernel - [PATCH 5/6] KVM: selftests: memslot_perf

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Date:   Fri, 14 Oct 2022 15:19:13 +0800
From:   Gavin Shan <gshan@...hat.com>
To:     kvmarm@...ts.linux.dev
Cc:     kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, ajones@...tanamicro.com,
        pbonzini@...hat.com, maz@...nel.org, shuah@...nel.org,
        oliver.upton@...ux.dev, seanjc@...gle.com, peterx@...hat.com,
        maciej.szmigiero@...cle.com, ricarkol@...gle.com,
        zhenyzha@...hat.com, shan.gavin@...il.com
Subject: [PATCH 5/6] KVM: selftests: memslot_perf_test: Consolidate memory sizes

The addresses and sizes passed to madvise() and vm_userspace_mem_region_add()
should be aligned to host page size, which can be 64KB on aarch64. So it's
wrong by passing additional fixed 4KB memory area to various tests.

Fix it by passing additional fixed 64KB memory area to various tests. After
it's applied, the following command works fine on 64KB-page-size-host and
4KB-page-size-guest.

  # ./memslot_perf_test -v -s 512

Signed-off-by: Gavin Shan <gshan@...hat.com>
---
 .../testing/selftests/kvm/memslot_perf_test.c  | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/tools/testing/selftests/kvm/memslot_perf_test.c b/tools/testing/selftests/kvm/memslot_perf_test.c
index d587bd952ff9..e6d34744b45d 100644
--- a/tools/testing/selftests/kvm/memslot_perf_test.c
+++ b/tools/testing/selftests/kvm/memslot_perf_test.c
@@ -25,12 +25,14 @@
 #include <kvm_util.h>
 #include <processor.h>
 
-#define MEM_SIZE		((512U << 20) + 4096)
-#define MEM_GPA		0x10000000UL
+#define MEM_EXTRA_SIZE		0x10000
+
+#define MEM_SIZE		((512U << 20) + MEM_EXTRA_SIZE)
+#define MEM_GPA			0x10000000UL
 #define MEM_AUX_GPA		MEM_GPA
 #define MEM_SYNC_GPA		MEM_AUX_GPA
-#define MEM_TEST_GPA		(MEM_AUX_GPA + 4096)
-#define MEM_TEST_SIZE		(MEM_SIZE - 4096)
+#define MEM_TEST_GPA		(MEM_AUX_GPA + MEM_EXTRA_SIZE)
+#define MEM_TEST_SIZE		(MEM_SIZE - MEM_EXTRA_SIZE)
 
 /*
  * 32 MiB is max size that gets well over 100 iterations on 509 slots.
@@ -38,8 +40,8 @@
  * 8194 slots in use can then be tested (although with slightly
  * limited resolution).
  */
-#define MEM_SIZE_MAP		((32U << 20) + 4096)
-#define MEM_TEST_MAP_SIZE	(MEM_SIZE_MAP - 4096)
+#define MEM_SIZE_MAP		((32U << 20) + MEM_EXTRA_SIZE)
+#define MEM_TEST_MAP_SIZE	(MEM_SIZE_MAP - MEM_EXTRA_SIZE)
 
 /*
  * 128 MiB is min size that fills 32k slots with at least one page in each
@@ -799,13 +801,13 @@ static const struct test_data tests[] = {
 	},
 	{
 		.name = "unmap",
-		.mem_size = MEM_TEST_UNMAP_SIZE + 4096,
+		.mem_size = MEM_TEST_UNMAP_SIZE + MEM_EXTRA_SIZE,
 		.guest_code = guest_code_test_memslot_unmap,
 		.loop = test_memslot_unmap_loop,
 	},
 	{
 		.name = "unmap chunked",
-		.mem_size = MEM_TEST_UNMAP_SIZE + 4096,
+		.mem_size = MEM_TEST_UNMAP_SIZE + MEM_EXTRA_SIZE,
 		.guest_code = guest_code_test_memslot_unmap,
 		.loop = test_memslot_unmap_loop_chunked,
 	},
-- 
2.23.0