perf test arm64: Add attr tests for new VG register

Ensure that the availability of the VG register behaves as expected
depending on the kernel version and SVE support.

Signed-off-by: James Clark <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

Author: James-A-Clark

tools/perf/tests/attr/test-record-user-regs-no-sve-aarch64

@@ -0,0 +1,9 @@
+# Test that asking for VG fails if the system doesn't support SVE. This
+# applies both before and after the feature was added in 6.1
+[config]
+command = record
+args    = --no-bpf-event --user-regs=vg kill >/dev/null 2>&1
+ret     = 129
+test_ret = true
+arch    = aarch64
+auxv    = auxv["AT_HWCAP"] & 0x200000 == 0

tools/perf/tests/attr/test-record-user-regs-old-sve-aarch64

@@ -0,0 +1,10 @@
+# Test that asking for VG always fails on old kernels because it was
+# added in 6.1. This applies to systems that either support or don't
+# support SVE.
+[config]
+command = record
+args    = --no-bpf-event --user-regs=vg kill >/dev/null 2>&1
+ret     = 129
+test_ret = true
+arch    = aarch64
+kernel_until = 6.1

tools/perf/tests/attr/test-record-user-regs-sve-aarch64

@@ -0,0 +1,14 @@
+# Test that asking for VG works if the system has SVE and after the
+# feature was added in 6.1
+[config]
+command = record
+args    = --no-bpf-event --user-regs=vg kill >/dev/null 2>&1
+ret     = 1
+test_ret = true
+arch    = aarch64
+auxv    = auxv["AT_HWCAP"] & 0x200000 == 0x200000
+kernel_since = 6.1
+
+[event:base-record]
+sample_type=4359
+sample_regs_user=70368744177664