* [PATCH] riscv: enable kcov
@ 2020-06-25 18:39 Tobias Klauser
2020-06-25 18:45 ` Dmitry Vyukov
2020-06-26 12:40 ` [PATCH v2] riscv: Allow building with kcov coverage Tobias Klauser
0 siblings, 2 replies; 6+ messages in thread
From: Tobias Klauser @ 2020-06-25 18:39 UTC (permalink / raw)
To: Paul Walmsley, Palmer Dabbelt, Albert Ou
Cc: Björn Töpel, linux-riscv, Dmitry Vyukov
Add ARCH_HAS_KCOV and HAVE_GCC_PLUGINS to the riscv Kconfig.
Also disable instrumentation of vdso.
Cc: Björn Töpel <bjorn.topel@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
---
arch/riscv/Kconfig | 2 ++
arch/riscv/kernel/vdso/Makefile | 1 +
2 files changed, 3 insertions(+)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 089293e4ad46..a7d7f8184f15 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -19,6 +19,7 @@ config RISCV
select ARCH_HAS_DEBUG_WX
select ARCH_HAS_GCOV_PROFILE_ALL
select ARCH_HAS_GIGANTIC_PAGE
+ select ARCH_HAS_KCOV
select ARCH_HAS_MMIOWB
select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_SET_DIRECT_MAP
@@ -57,6 +58,7 @@ config RISCV
select HAVE_DMA_CONTIGUOUS if MMU
select HAVE_EBPF_JIT if MMU
select HAVE_FUTEX_CMPXCHG if FUTEX
+ select HAVE_GCC_PLUGINS
select HAVE_GENERIC_VDSO if MMU && 64BIT
select HAVE_PCI
select HAVE_PERF_EVENTS
diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
index 38ba55b0eb9d..9debbaab393d 100644
--- a/arch/riscv/kernel/vdso/Makefile
+++ b/arch/riscv/kernel/vdso/Makefile
@@ -29,6 +29,7 @@ CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
# Disable gcov profiling for VDSO code
GCOV_PROFILE := n
+KCOV_INSTRUMENT := n
# Force dependency
$(obj)/vdso.o: $(obj)/vdso.so
--
2.27.0
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^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH] riscv: enable kcov
2020-06-25 18:39 [PATCH] riscv: enable kcov Tobias Klauser
@ 2020-06-25 18:45 ` Dmitry Vyukov
2020-06-26 12:02 ` Tobias Klauser
2020-06-26 12:40 ` [PATCH v2] riscv: Allow building with kcov coverage Tobias Klauser
1 sibling, 1 reply; 6+ messages in thread
From: Dmitry Vyukov @ 2020-06-25 18:45 UTC (permalink / raw)
To: Tobias Klauser
Cc: Albert Ou, Björn Töpel, syzkaller, Palmer Dabbelt,
Paul Walmsley, linux-riscv
On Thu, Jun 25, 2020 at 8:39 PM Tobias Klauser <tklauser@distanz.ch> wrote:
>
> Add ARCH_HAS_KCOV and HAVE_GCC_PLUGINS to the riscv Kconfig.
> Also disable instrumentation of vdso.
>
> Cc: Björn Töpel <bjorn.topel@gmail.com>
> Cc: Dmitry Vyukov <dvyukov@google.com>
> Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
If it boots:
Acked-by: Dmitry Vyukov <dvyukov@google.com>
FWIW for x86 we needed to do much more of this:
$ find arch/x86/ -name Makefile -exec grep KCOV_INSTRUMENT {} \; -print
KCOV_INSTRUMENT := n
arch/x86/kernel/Makefile
KCOV_INSTRUMENT := n
arch/x86/kernel/apic/Makefile
KCOV_INSTRUMENT_common.o := n
KCOV_INSTRUMENT_perf_event.o := n
arch/x86/kernel/cpu/Makefile
KCOV_INSTRUMENT := n
arch/x86/realmode/rm/Makefile
KCOV_INSTRUMENT := n
arch/x86/boot/Makefile
KCOV_INSTRUMENT := n
arch/x86/boot/compressed/Makefile
KCOV_INSTRUMENT := n
arch/x86/entry/Makefile
KCOV_INSTRUMENT := n
arch/x86/entry/vdso/Makefile
KCOV_INSTRUMENT := n
arch/x86/um/vdso/Makefile
KCOV_INSTRUMENT_delay.o := n
KCOV_INSTRUMENT_cmdline.o := n
arch/x86/lib/Makefile
KCOV_INSTRUMENT_tlb.o := n
KCOV_INSTRUMENT_mem_encrypt.o := n
KCOV_INSTRUMENT_mem_encrypt_identity.o := n
arch/x86/mm/Makefile
KCOV_INSTRUMENT := n
arch/x86/purgatory/Makefile
> ---
> arch/riscv/Kconfig | 2 ++
> arch/riscv/kernel/vdso/Makefile | 1 +
> 2 files changed, 3 insertions(+)
>
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 089293e4ad46..a7d7f8184f15 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -19,6 +19,7 @@ config RISCV
> select ARCH_HAS_DEBUG_WX
> select ARCH_HAS_GCOV_PROFILE_ALL
> select ARCH_HAS_GIGANTIC_PAGE
> + select ARCH_HAS_KCOV
> select ARCH_HAS_MMIOWB
> select ARCH_HAS_PTE_SPECIAL
> select ARCH_HAS_SET_DIRECT_MAP
> @@ -57,6 +58,7 @@ config RISCV
> select HAVE_DMA_CONTIGUOUS if MMU
> select HAVE_EBPF_JIT if MMU
> select HAVE_FUTEX_CMPXCHG if FUTEX
> + select HAVE_GCC_PLUGINS
> select HAVE_GENERIC_VDSO if MMU && 64BIT
> select HAVE_PCI
> select HAVE_PERF_EVENTS
> diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
> index 38ba55b0eb9d..9debbaab393d 100644
> --- a/arch/riscv/kernel/vdso/Makefile
> +++ b/arch/riscv/kernel/vdso/Makefile
> @@ -29,6 +29,7 @@ CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
>
> # Disable gcov profiling for VDSO code
> GCOV_PROFILE := n
> +KCOV_INSTRUMENT := n
>
> # Force dependency
> $(obj)/vdso.o: $(obj)/vdso.so
> --
> 2.27.0
>
_______________________________________________
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linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] riscv: enable kcov
2020-06-25 18:45 ` Dmitry Vyukov
@ 2020-06-26 12:02 ` Tobias Klauser
0 siblings, 0 replies; 6+ messages in thread
From: Tobias Klauser @ 2020-06-26 12:02 UTC (permalink / raw)
To: Dmitry Vyukov
Cc: Albert Ou, Björn Töpel, syzkaller, Palmer Dabbelt,
Paul Walmsley, linux-riscv
On 2020-06-25 at 20:45:55 +0200, Dmitry Vyukov <dvyukov@google.com> wrote:
> On Thu, Jun 25, 2020 at 8:39 PM Tobias Klauser <tklauser@distanz.ch> wrote:
> >
> > Add ARCH_HAS_KCOV and HAVE_GCC_PLUGINS to the riscv Kconfig.
> > Also disable instrumentation of vdso.
> >
> > Cc: Björn Töpel <bjorn.topel@gmail.com>
> > Cc: Dmitry Vyukov <dvyukov@google.com>
> > Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
>
>
> If it boots:
>
> Acked-by: Dmitry Vyukov <dvyukov@google.com>
Yeah turns out I boot-tested this with a kernel which didn't have
CONFIG_KCOV enabled :-/ Will send a v2 patch.
> FWIW for x86 we needed to do much more of this:
>
> $ find arch/x86/ -name Makefile -exec grep KCOV_INSTRUMENT {} \; -print
> KCOV_INSTRUMENT := n
> arch/x86/kernel/Makefile
> KCOV_INSTRUMENT := n
> arch/x86/kernel/apic/Makefile
> KCOV_INSTRUMENT_common.o := n
> KCOV_INSTRUMENT_perf_event.o := n
> arch/x86/kernel/cpu/Makefile
> KCOV_INSTRUMENT := n
> arch/x86/realmode/rm/Makefile
> KCOV_INSTRUMENT := n
> arch/x86/boot/Makefile
> KCOV_INSTRUMENT := n
> arch/x86/boot/compressed/Makefile
> KCOV_INSTRUMENT := n
> arch/x86/entry/Makefile
> KCOV_INSTRUMENT := n
> arch/x86/entry/vdso/Makefile
> KCOV_INSTRUMENT := n
> arch/x86/um/vdso/Makefile
> KCOV_INSTRUMENT_delay.o := n
> KCOV_INSTRUMENT_cmdline.o := n
> arch/x86/lib/Makefile
> KCOV_INSTRUMENT_tlb.o := n
> KCOV_INSTRUMENT_mem_encrypt.o := n
> KCOV_INSTRUMENT_mem_encrypt_identity.o := n
> arch/x86/mm/Makefile
> KCOV_INSTRUMENT := n
> arch/x86/purgatory/Makefile
Thanks, that's very helpful.
_______________________________________________
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http://lists.infradead.org/mailman/listinfo/linux-riscv
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH v2] riscv: Allow building with kcov coverage
2020-06-25 18:39 [PATCH] riscv: enable kcov Tobias Klauser
2020-06-25 18:45 ` Dmitry Vyukov
@ 2020-06-26 12:40 ` Tobias Klauser
2020-06-26 14:28 ` Dmitry Vyukov
2020-07-11 4:27 ` Palmer Dabbelt
1 sibling, 2 replies; 6+ messages in thread
From: Tobias Klauser @ 2020-06-26 12:40 UTC (permalink / raw)
To: Paul Walmsley, Palmer Dabbelt, Albert Ou
Cc: Björn Töpel, linux-riscv, linux-kernel, Dmitry Vyukov
Add ARCH_HAS_KCOV and HAVE_GCC_PLUGINS to the riscv Kconfig.
Also disable instrumentation of some early boot code and vdso.
Boot-tested on QEMU's riscv64 virt machine.
Cc: Björn Töpel <bjorn.topel@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
---
arch/riscv/Kconfig | 2 ++
arch/riscv/boot/Makefile | 2 ++
arch/riscv/kernel/vdso/Makefile | 1 +
arch/riscv/mm/Makefile | 2 ++
4 files changed, 7 insertions(+)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 089293e4ad46..a7d7f8184f15 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -19,6 +19,7 @@ config RISCV
select ARCH_HAS_DEBUG_WX
select ARCH_HAS_GCOV_PROFILE_ALL
select ARCH_HAS_GIGANTIC_PAGE
+ select ARCH_HAS_KCOV
select ARCH_HAS_MMIOWB
select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_SET_DIRECT_MAP
@@ -57,6 +58,7 @@ config RISCV
select HAVE_DMA_CONTIGUOUS if MMU
select HAVE_EBPF_JIT if MMU
select HAVE_FUTEX_CMPXCHG if FUTEX
+ select HAVE_GCC_PLUGINS
select HAVE_GENERIC_VDSO if MMU && 64BIT
select HAVE_PCI
select HAVE_PERF_EVENTS
diff --git a/arch/riscv/boot/Makefile b/arch/riscv/boot/Makefile
index 3530c59b3ea7..c59fca695f9d 100644
--- a/arch/riscv/boot/Makefile
+++ b/arch/riscv/boot/Makefile
@@ -14,6 +14,8 @@
# Based on the ia64 and arm64 boot/Makefile.
#
+KCOV_INSTRUMENT := n
+
OBJCOPYFLAGS_Image :=-O binary -R .note -R .note.gnu.build-id -R .comment -S
targets := Image loader
diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
index 29cf052f6541..4b0d3bcc44e5 100644
--- a/arch/riscv/kernel/vdso/Makefile
+++ b/arch/riscv/kernel/vdso/Makefile
@@ -29,6 +29,7 @@ CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
# Disable gcov profiling for VDSO code
GCOV_PROFILE := n
+KCOV_INSTRUMENT := n
# Force dependency
$(obj)/vdso.o: $(obj)/vdso.so
diff --git a/arch/riscv/mm/Makefile b/arch/riscv/mm/Makefile
index 363ef01c30b1..c0185e556ca5 100644
--- a/arch/riscv/mm/Makefile
+++ b/arch/riscv/mm/Makefile
@@ -5,6 +5,8 @@ ifdef CONFIG_FTRACE
CFLAGS_REMOVE_init.o = -pg
endif
+KCOV_INSTRUMENT_init.o := n
+
obj-y += init.o
obj-y += extable.o
obj-$(CONFIG_MMU) += fault.o pageattr.o
--
2.27.0
_______________________________________________
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linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v2] riscv: Allow building with kcov coverage
2020-06-26 12:40 ` [PATCH v2] riscv: Allow building with kcov coverage Tobias Klauser
@ 2020-06-26 14:28 ` Dmitry Vyukov
2020-07-11 4:27 ` Palmer Dabbelt
1 sibling, 0 replies; 6+ messages in thread
From: Dmitry Vyukov @ 2020-06-26 14:28 UTC (permalink / raw)
To: Tobias Klauser
Cc: Albert Ou, Björn Töpel, LKML, Palmer Dabbelt,
Paul Walmsley, linux-riscv
On Fri, Jun 26, 2020 at 2:40 PM Tobias Klauser <tklauser@distanz.ch> wrote:
>
> Add ARCH_HAS_KCOV and HAVE_GCC_PLUGINS to the riscv Kconfig.
> Also disable instrumentation of some early boot code and vdso.
>
> Boot-tested on QEMU's riscv64 virt machine.
>
> Cc: Björn Töpel <bjorn.topel@gmail.com>
> Cc: Dmitry Vyukov <dvyukov@google.com>
> Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Assuming it boots now :)
Acked-by: Dmitry Vyukov <dvyukov@google.com>
> ---
> arch/riscv/Kconfig | 2 ++
> arch/riscv/boot/Makefile | 2 ++
> arch/riscv/kernel/vdso/Makefile | 1 +
> arch/riscv/mm/Makefile | 2 ++
> 4 files changed, 7 insertions(+)
>
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 089293e4ad46..a7d7f8184f15 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -19,6 +19,7 @@ config RISCV
> select ARCH_HAS_DEBUG_WX
> select ARCH_HAS_GCOV_PROFILE_ALL
> select ARCH_HAS_GIGANTIC_PAGE
> + select ARCH_HAS_KCOV
> select ARCH_HAS_MMIOWB
> select ARCH_HAS_PTE_SPECIAL
> select ARCH_HAS_SET_DIRECT_MAP
> @@ -57,6 +58,7 @@ config RISCV
> select HAVE_DMA_CONTIGUOUS if MMU
> select HAVE_EBPF_JIT if MMU
> select HAVE_FUTEX_CMPXCHG if FUTEX
> + select HAVE_GCC_PLUGINS
> select HAVE_GENERIC_VDSO if MMU && 64BIT
> select HAVE_PCI
> select HAVE_PERF_EVENTS
> diff --git a/arch/riscv/boot/Makefile b/arch/riscv/boot/Makefile
> index 3530c59b3ea7..c59fca695f9d 100644
> --- a/arch/riscv/boot/Makefile
> +++ b/arch/riscv/boot/Makefile
> @@ -14,6 +14,8 @@
> # Based on the ia64 and arm64 boot/Makefile.
> #
>
> +KCOV_INSTRUMENT := n
> +
> OBJCOPYFLAGS_Image :=-O binary -R .note -R .note.gnu.build-id -R .comment -S
>
> targets := Image loader
> diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
> index 29cf052f6541..4b0d3bcc44e5 100644
> --- a/arch/riscv/kernel/vdso/Makefile
> +++ b/arch/riscv/kernel/vdso/Makefile
> @@ -29,6 +29,7 @@ CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
>
> # Disable gcov profiling for VDSO code
> GCOV_PROFILE := n
> +KCOV_INSTRUMENT := n
>
> # Force dependency
> $(obj)/vdso.o: $(obj)/vdso.so
> diff --git a/arch/riscv/mm/Makefile b/arch/riscv/mm/Makefile
> index 363ef01c30b1..c0185e556ca5 100644
> --- a/arch/riscv/mm/Makefile
> +++ b/arch/riscv/mm/Makefile
> @@ -5,6 +5,8 @@ ifdef CONFIG_FTRACE
> CFLAGS_REMOVE_init.o = -pg
> endif
>
> +KCOV_INSTRUMENT_init.o := n
> +
> obj-y += init.o
> obj-y += extable.o
> obj-$(CONFIG_MMU) += fault.o pageattr.o
> --
> 2.27.0
>
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http://lists.infradead.org/mailman/listinfo/linux-riscv
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2] riscv: Allow building with kcov coverage
2020-06-26 12:40 ` [PATCH v2] riscv: Allow building with kcov coverage Tobias Klauser
2020-06-26 14:28 ` Dmitry Vyukov
@ 2020-07-11 4:27 ` Palmer Dabbelt
1 sibling, 0 replies; 6+ messages in thread
From: Palmer Dabbelt @ 2020-07-11 4:27 UTC (permalink / raw)
To: tklauser
Cc: aou, Bjorn Topel, linux-kernel, Paul Walmsley, linux-riscv, dvyukov
On Fri, 26 Jun 2020 05:40:56 PDT (-0700), tklauser@distanz.ch wrote:
> Add ARCH_HAS_KCOV and HAVE_GCC_PLUGINS to the riscv Kconfig.
> Also disable instrumentation of some early boot code and vdso.
>
> Boot-tested on QEMU's riscv64 virt machine.
Thanks. This is on for-next (with the ack). I'm boot testing a config with
CONFIG_KCOV=y
CONFIG_KCOV_ENABLE_COMPARISONS=y
but LMK if there's something more interesting to test. I don't see anything
coverage-related in the boot log...
> Cc: Björn Töpel <bjorn.topel@gmail.com>
> Cc: Dmitry Vyukov <dvyukov@google.com>
> Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
> ---
> arch/riscv/Kconfig | 2 ++
> arch/riscv/boot/Makefile | 2 ++
> arch/riscv/kernel/vdso/Makefile | 1 +
> arch/riscv/mm/Makefile | 2 ++
> 4 files changed, 7 insertions(+)
>
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 089293e4ad46..a7d7f8184f15 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -19,6 +19,7 @@ config RISCV
> select ARCH_HAS_DEBUG_WX
> select ARCH_HAS_GCOV_PROFILE_ALL
> select ARCH_HAS_GIGANTIC_PAGE
> + select ARCH_HAS_KCOV
> select ARCH_HAS_MMIOWB
> select ARCH_HAS_PTE_SPECIAL
> select ARCH_HAS_SET_DIRECT_MAP
> @@ -57,6 +58,7 @@ config RISCV
> select HAVE_DMA_CONTIGUOUS if MMU
> select HAVE_EBPF_JIT if MMU
> select HAVE_FUTEX_CMPXCHG if FUTEX
> + select HAVE_GCC_PLUGINS
> select HAVE_GENERIC_VDSO if MMU && 64BIT
> select HAVE_PCI
> select HAVE_PERF_EVENTS
> diff --git a/arch/riscv/boot/Makefile b/arch/riscv/boot/Makefile
> index 3530c59b3ea7..c59fca695f9d 100644
> --- a/arch/riscv/boot/Makefile
> +++ b/arch/riscv/boot/Makefile
> @@ -14,6 +14,8 @@
> # Based on the ia64 and arm64 boot/Makefile.
> #
>
> +KCOV_INSTRUMENT := n
> +
> OBJCOPYFLAGS_Image :=-O binary -R .note -R .note.gnu.build-id -R .comment -S
>
> targets := Image loader
> diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
> index 29cf052f6541..4b0d3bcc44e5 100644
> --- a/arch/riscv/kernel/vdso/Makefile
> +++ b/arch/riscv/kernel/vdso/Makefile
> @@ -29,6 +29,7 @@ CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
>
> # Disable gcov profiling for VDSO code
> GCOV_PROFILE := n
> +KCOV_INSTRUMENT := n
>
> # Force dependency
> $(obj)/vdso.o: $(obj)/vdso.so
> diff --git a/arch/riscv/mm/Makefile b/arch/riscv/mm/Makefile
> index 363ef01c30b1..c0185e556ca5 100644
> --- a/arch/riscv/mm/Makefile
> +++ b/arch/riscv/mm/Makefile
> @@ -5,6 +5,8 @@ ifdef CONFIG_FTRACE
> CFLAGS_REMOVE_init.o = -pg
> endif
>
> +KCOV_INSTRUMENT_init.o := n
> +
> obj-y += init.o
> obj-y += extable.o
> obj-$(CONFIG_MMU) += fault.o pageattr.o
_______________________________________________
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http://lists.infradead.org/mailman/listinfo/linux-riscv
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2020-07-11 4:27 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2020-06-25 18:39 [PATCH] riscv: enable kcov Tobias Klauser
2020-06-25 18:45 ` Dmitry Vyukov
2020-06-26 12:02 ` Tobias Klauser
2020-06-26 12:40 ` [PATCH v2] riscv: Allow building with kcov coverage Tobias Klauser
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