| Message ID | 20220627163912.5581-1-adam@wowsignal.io (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [v3] selftests/vm: Only run 128TBswitch with 5-level paging | expand |
Adam Sindelar <adam@wowsignal.io> writes: > The test va_128TBswitch.c expects to be able to pass mmap an address hint > and length that cross the address 1<<47. This is not possible without > 5-level page tables, so the test fails. > > The test is already only run on 64-bit powerpc and x86 archs, but this > patch adds an additional check that skips the test if PG_TABLE_LEVELS < 5. > There is precedent for checking /proc/config.gz in selftests, e.g. in > selftests/firmware. > > Running the tests produces the desired output: > > sudo make -C tools/testing/selftests TARGETS=vm run_tests > --------------------------- > running ./va_128TBswitch.sh > --------------------------- > ./va_128TBswitch.sh: PG_TABLE_LEVELS=4, must be >= 5 to run this test > [SKIP] > ------------------------------- > > Signed-off-by: Adam Sindelar <adam@wowsignal.io> > --- > V2 -> V3: Clean up the commit message > V1 -> V2: Variables local, fixed Makefile typo, comment on gzip usage > > tools/testing/selftests/vm/Makefile | 1 + > tools/testing/selftests/vm/run_vmtests.sh | 2 +- > tools/testing/selftests/vm/va_128TBswitch.sh | 39 ++++++++++++++++++++ > 3 files changed, 41 insertions(+), 1 deletion(-) > create mode 100755 tools/testing/selftests/vm/va_128TBswitch.sh > > diff --git a/tools/testing/selftests/vm/Makefile b/tools/testing/selftests/vm/Makefile > index c45e535ff4b8..7860d0969888 100644 > --- a/tools/testing/selftests/vm/Makefile > +++ b/tools/testing/selftests/vm/Makefile > @@ -91,6 +91,7 @@ endif > TEST_PROGS := run_vmtests.sh > > TEST_FILES := test_vmalloc.sh > +TEST_FILES += va_128TBswitch.sh > > KSFT_KHDR_INSTALL := 1 > include ../lib.mk > diff --git a/tools/testing/selftests/vm/run_vmtests.sh b/tools/testing/selftests/vm/run_vmtests.sh > index a2302b5faaf2..edda7350ccca 100755 > --- a/tools/testing/selftests/vm/run_vmtests.sh > +++ b/tools/testing/selftests/vm/run_vmtests.sh > @@ -149,7 +149,7 @@ if [ $VADDR64 -ne 0 ]; then > run_test ./virtual_address_range > > # virtual address 128TB switch test > - run_test ./va_128TBswitch > + run_test ./va_128TBswitch.sh > fi # VADDR64 > > # vmalloc stability smoke test > diff --git a/tools/testing/selftests/vm/va_128TBswitch.sh b/tools/testing/selftests/vm/va_128TBswitch.sh > new file mode 100755 > index 000000000000..767a6465b5d2 > --- /dev/null > +++ b/tools/testing/selftests/vm/va_128TBswitch.sh > @@ -0,0 +1,39 @@ > +#!/bin/bash > +# SPDX-License-Identifier: GPL-2.0 > +# > +# Copyright (C) 2022 Adam Sindelar (Meta) <adam@wowsignal.io> > +# > +# This is a test for mmap behavior with 5-level paging. This script wraps the > +# real test to check that the kernel is configured to support at least 5 > +# pagetable levels. > + > +# 1 means the test failed > +exitcode=1 > + > +# Kselftest framework requirement - SKIP code is 4. > +ksft_skip=4 > + > +die() > +{ > + echo "$1" > + exit $exitcode > +} > + > +check_test_requirements() > +{ > + local config="/proc/config.gz" > + [[ -f "${config}" ]] || config="/boot/config-$(uname -r)" > + [[ -f "${config}" ]] || die "Cannot find kernel config in /proc or /boot" > + > + # gzip -dcfq automatically handles both compressed and plaintext input. > + # See man 1 gzip under '-f'. > + local pg_table_levels=$(gzip -dcfq "${config}" | grep PGTABLE_LEVELS | cut -d'=' -f 2) > + > + if [[ "${pg_table_levels}" -lt 5 ]]; then > + echo "$0: PG_TABLE_LEVELS=${pg_table_levels}, must be >= 5 to run this test" > + exit $ksft_skip > + fi > +} This prevent the test from running on powerpc architecture. $bash -x ./va_128TBswitch.sh + exitcode=1 + ksft_skip=4 + check_test_requirements + local config=/proc/config.gz + [[ -f /proc/config.gz ]] + [[ -f /proc/config.gz ]] ++ gzip -dcfq /proc/config.gz ++ grep PGTABLE_LEVELS ++ cut -d= -f 2 + local pg_table_levels=4 + [[ 4 -lt 5 ]] + echo './va_128TBswitch.sh: PG_TABLE_LEVELS=4, must be >= 5 to run this test' ./va_128TBswitch.sh: PG_TABLE_LEVELS=4, must be >= 5 to run this test + exit 4 Without the patch :src/linux/tools/testing/selftests/vm$ ./va_128TBswitch mmap(ADDR_SWITCH_HINT - PAGE_SIZE, PAGE_SIZE): 0x7fffffff0000 - OK mmap(ADDR_SWITCH_HINT - PAGE_SIZE, (2 * PAGE_SIZE)): 0x763910f30000 - OK mmap(ADDR_SWITCH_HINT, PAGE_SIZE): 0x763910f40000 - OK mmap(ADDR_SWITCH_HINT, 2 * PAGE_SIZE, MAP_FIXED): 0x800000000000 - OK mmap(NULL): 0x763910f20000 - OK mmap(LOW_ADDR): 0x40000000 - OK mmap(HIGH_ADDR): 0x1000000000000 - OK mmap(HIGH_ADDR) again: 0xff63910fc0000 - OK mmap(HIGH_ADDR, MAP_FIXED): 0x1000000000000 - OK mmap(-1): 0xff63910fa0000 - OK mmap(-1) again: 0xff63910f80000 - OK mmap(ADDR_SWITCH_HINT - PAGE_SIZE, PAGE_SIZE): 0x7fffffff0000 - OK mmap(ADDR_SWITCH_HINT - PAGE_SIZE, 2 * PAGE_SIZE): 0x763910f20000 - OK mmap(ADDR_SWITCH_HINT - PAGE_SIZE/2 , 2 * PAGE_SIZE): 0x763910f00000 - OK mmap(ADDR_SWITCH_HINT, PAGE_SIZE): 0x763910ef0000 - OK mmap(ADDR_SWITCH_HINT, 2 * PAGE_SIZE, MAP_FIXED): 0x800000000000 - OK > + > +check_test_requirements > +./va_128TBswitch > -- > 2.35.1
On Tue, Jun 28, 2022 at 08:49:42PM +0530, Aneesh Kumar K.V wrote: > Adam Sindelar <adam@wowsignal.io> writes: > > > The test va_128TBswitch.c expects to be able to pass mmap an address hint > > and length that cross the address 1<<47. This is not possible without > > 5-level page tables, so the test fails. > > > > The test is already only run on 64-bit powerpc and x86 archs, but this > > patch adds an additional check that skips the test if PG_TABLE_LEVELS < 5. > > There is precedent for checking /proc/config.gz in selftests, e.g. in > > selftests/firmware. > > > > Running the tests produces the desired output: > > > > sudo make -C tools/testing/selftests TARGETS=vm run_tests > > --------------------------- > > running ./va_128TBswitch.sh > > --------------------------- > > ./va_128TBswitch.sh: PG_TABLE_LEVELS=4, must be >= 5 to run this test > > [SKIP] > > ------------------------------- > > > > Signed-off-by: Adam Sindelar <adam@wowsignal.io> > > --- > > V2 -> V3: Clean up the commit message > > V1 -> V2: Variables local, fixed Makefile typo, comment on gzip usage > > > > tools/testing/selftests/vm/Makefile | 1 + > > tools/testing/selftests/vm/run_vmtests.sh | 2 +- > > tools/testing/selftests/vm/va_128TBswitch.sh | 39 ++++++++++++++++++++ > > 3 files changed, 41 insertions(+), 1 deletion(-) > > create mode 100755 tools/testing/selftests/vm/va_128TBswitch.sh > > > > diff --git a/tools/testing/selftests/vm/Makefile b/tools/testing/selftests/vm/Makefile > > index c45e535ff4b8..7860d0969888 100644 > > --- a/tools/testing/selftests/vm/Makefile > > +++ b/tools/testing/selftests/vm/Makefile > > @@ -91,6 +91,7 @@ endif > > TEST_PROGS := run_vmtests.sh > > > > TEST_FILES := test_vmalloc.sh > > +TEST_FILES += va_128TBswitch.sh > > > > KSFT_KHDR_INSTALL := 1 > > include ../lib.mk > > diff --git a/tools/testing/selftests/vm/run_vmtests.sh b/tools/testing/selftests/vm/run_vmtests.sh > > index a2302b5faaf2..edda7350ccca 100755 > > --- a/tools/testing/selftests/vm/run_vmtests.sh > > +++ b/tools/testing/selftests/vm/run_vmtests.sh > > @@ -149,7 +149,7 @@ if [ $VADDR64 -ne 0 ]; then > > run_test ./virtual_address_range > > > > # virtual address 128TB switch test > > - run_test ./va_128TBswitch > > + run_test ./va_128TBswitch.sh > > fi # VADDR64 > > > > # vmalloc stability smoke test > > diff --git a/tools/testing/selftests/vm/va_128TBswitch.sh b/tools/testing/selftests/vm/va_128TBswitch.sh > > new file mode 100755 > > index 000000000000..767a6465b5d2 > > --- /dev/null > > +++ b/tools/testing/selftests/vm/va_128TBswitch.sh > > @@ -0,0 +1,39 @@ > > +#!/bin/bash > > +# SPDX-License-Identifier: GPL-2.0 > > +# > > +# Copyright (C) 2022 Adam Sindelar (Meta) <adam@wowsignal.io> > > +# > > +# This is a test for mmap behavior with 5-level paging. This script wraps the > > +# real test to check that the kernel is configured to support at least 5 > > +# pagetable levels. > > + > > +# 1 means the test failed > > +exitcode=1 > > + > > +# Kselftest framework requirement - SKIP code is 4. > > +ksft_skip=4 > > + > > +die() > > +{ > > + echo "$1" > > + exit $exitcode > > +} > > + > > +check_test_requirements() > > +{ > > + local config="/proc/config.gz" > > + [[ -f "${config}" ]] || config="/boot/config-$(uname -r)" > > + [[ -f "${config}" ]] || die "Cannot find kernel config in /proc or /boot" > > + > > + # gzip -dcfq automatically handles both compressed and plaintext input. > > + # See man 1 gzip under '-f'. > > + local pg_table_levels=$(gzip -dcfq "${config}" | grep PGTABLE_LEVELS | cut -d'=' -f 2) > > + > > + if [[ "${pg_table_levels}" -lt 5 ]]; then > > + echo "$0: PG_TABLE_LEVELS=${pg_table_levels}, must be >= 5 to run this test" > > + exit $ksft_skip > > + fi > > +} > > This prevent the test from running on powerpc architecture. > > $bash -x ./va_128TBswitch.sh > + exitcode=1 > + ksft_skip=4 > + check_test_requirements > + local config=/proc/config.gz > + [[ -f /proc/config.gz ]] > + [[ -f /proc/config.gz ]] > ++ gzip -dcfq /proc/config.gz > ++ grep PGTABLE_LEVELS > ++ cut -d= -f 2 > + local pg_table_levels=4 > + [[ 4 -lt 5 ]] > + echo './va_128TBswitch.sh: PG_TABLE_LEVELS=4, must be >= 5 to run this test' > ./va_128TBswitch.sh: PG_TABLE_LEVELS=4, must be >= 5 to run this test > + exit 4 > > Without the patch > > :src/linux/tools/testing/selftests/vm$ ./va_128TBswitch > mmap(ADDR_SWITCH_HINT - PAGE_SIZE, PAGE_SIZE): 0x7fffffff0000 - OK > mmap(ADDR_SWITCH_HINT - PAGE_SIZE, (2 * PAGE_SIZE)): 0x763910f30000 - OK > mmap(ADDR_SWITCH_HINT, PAGE_SIZE): 0x763910f40000 - OK > mmap(ADDR_SWITCH_HINT, 2 * PAGE_SIZE, MAP_FIXED): 0x800000000000 - OK > mmap(NULL): 0x763910f20000 - OK > mmap(LOW_ADDR): 0x40000000 - OK > mmap(HIGH_ADDR): 0x1000000000000 - OK > mmap(HIGH_ADDR) again: 0xff63910fc0000 - OK > mmap(HIGH_ADDR, MAP_FIXED): 0x1000000000000 - OK > mmap(-1): 0xff63910fa0000 - OK > mmap(-1) again: 0xff63910f80000 - OK > mmap(ADDR_SWITCH_HINT - PAGE_SIZE, PAGE_SIZE): 0x7fffffff0000 - OK > mmap(ADDR_SWITCH_HINT - PAGE_SIZE, 2 * PAGE_SIZE): 0x763910f20000 - OK > mmap(ADDR_SWITCH_HINT - PAGE_SIZE/2 , 2 * PAGE_SIZE): 0x763910f00000 - OK > mmap(ADDR_SWITCH_HINT, PAGE_SIZE): 0x763910ef0000 - OK > mmap(ADDR_SWITCH_HINT, 2 * PAGE_SIZE, MAP_FIXED): 0x800000000000 - OK > > + > > +check_test_requirements > > +./va_128TBswitch > > -- > > 2.35.1 My bad, sorry. Let me fix it in v4.
diff --git a/tools/testing/selftests/vm/Makefile b/tools/testing/selftests/vm/Makefile index c45e535ff4b8..7860d0969888 100644 --- a/tools/testing/selftests/vm/Makefile +++ b/tools/testing/selftests/vm/Makefile @@ -91,6 +91,7 @@ endif TEST_PROGS := run_vmtests.sh TEST_FILES := test_vmalloc.sh +TEST_FILES += va_128TBswitch.sh KSFT_KHDR_INSTALL := 1 include ../lib.mk diff --git a/tools/testing/selftests/vm/run_vmtests.sh b/tools/testing/selftests/vm/run_vmtests.sh index a2302b5faaf2..edda7350ccca 100755 --- a/tools/testing/selftests/vm/run_vmtests.sh +++ b/tools/testing/selftests/vm/run_vmtests.sh @@ -149,7 +149,7 @@ if [ $VADDR64 -ne 0 ]; then run_test ./virtual_address_range # virtual address 128TB switch test - run_test ./va_128TBswitch + run_test ./va_128TBswitch.sh fi # VADDR64 # vmalloc stability smoke test diff --git a/tools/testing/selftests/vm/va_128TBswitch.sh b/tools/testing/selftests/vm/va_128TBswitch.sh new file mode 100755 index 000000000000..767a6465b5d2 --- /dev/null +++ b/tools/testing/selftests/vm/va_128TBswitch.sh @@ -0,0 +1,39 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 +# +# Copyright (C) 2022 Adam Sindelar (Meta) <adam@wowsignal.io> +# +# This is a test for mmap behavior with 5-level paging. This script wraps the +# real test to check that the kernel is configured to support at least 5 +# pagetable levels. + +# 1 means the test failed +exitcode=1 + +# Kselftest framework requirement - SKIP code is 4. +ksft_skip=4 + +die() +{ + echo "$1" + exit $exitcode +} + +check_test_requirements() +{ + local config="/proc/config.gz" + [[ -f "${config}" ]] || config="/boot/config-$(uname -r)" + [[ -f "${config}" ]] || die "Cannot find kernel config in /proc or /boot" + + # gzip -dcfq automatically handles both compressed and plaintext input. + # See man 1 gzip under '-f'. + local pg_table_levels=$(gzip -dcfq "${config}" | grep PGTABLE_LEVELS | cut -d'=' -f 2) + + if [[ "${pg_table_levels}" -lt 5 ]]; then + echo "$0: PG_TABLE_LEVELS=${pg_table_levels}, must be >= 5 to run this test" + exit $ksft_skip + fi +} + +check_test_requirements +./va_128TBswitch
The test va_128TBswitch.c expects to be able to pass mmap an address hint and length that cross the address 1<<47. This is not possible without 5-level page tables, so the test fails. The test is already only run on 64-bit powerpc and x86 archs, but this patch adds an additional check that skips the test if PG_TABLE_LEVELS < 5. There is precedent for checking /proc/config.gz in selftests, e.g. in selftests/firmware. Running the tests produces the desired output: sudo make -C tools/testing/selftests TARGETS=vm run_tests --------------------------- running ./va_128TBswitch.sh --------------------------- ./va_128TBswitch.sh: PG_TABLE_LEVELS=4, must be >= 5 to run this test [SKIP] ------------------------------- Signed-off-by: Adam Sindelar <adam@wowsignal.io> --- V2 -> V3: Clean up the commit message V1 -> V2: Variables local, fixed Makefile typo, comment on gzip usage tools/testing/selftests/vm/Makefile | 1 + tools/testing/selftests/vm/run_vmtests.sh | 2 +- tools/testing/selftests/vm/va_128TBswitch.sh | 39 ++++++++++++++++++++ 3 files changed, 41 insertions(+), 1 deletion(-) create mode 100755 tools/testing/selftests/vm/va_128TBswitch.sh