From: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
To: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Cc: zohar@linux.ibm.com, robh@kernel.org, gregkh@linuxfoundation.org,
james.morse@arm.com, catalin.marinas@arm.com, sashal@kernel.org,
will@kernel.org, mpe@ellerman.id.au, benh@kernel.crashing.org,
paulus@samba.org, robh+dt@kernel.org, frowand.list@gmail.com,
vincenzo.frascino@arm.com, mark.rutland@arm.com,
dmitry.kasatkin@gmail.com, jmorris@namei.org, serge@hallyn.com,
pasha.tatashin@soleen.com, allison@lohutok.net,
kstewart@linuxfoundation.org, takahiro.akashi@linaro.org,
tglx@linutronix.de, masahiroy@kernel.org, bhsharma@redhat.com,
mbrugger@suse.com, hsinyi@chromium.org, tao.li@vivo.com,
christophe.leroy@c-s.fr, linux-integrity@vger.kernel.org,
linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
prsriva@linux.microsoft.com, balajib@linux.microsoft.com
Subject: Re: [PATCH v10 2/8] powerpc: Move delete_fdt_mem_rsv() to drivers/of/kexec.c
Date: Fri, 11 Dec 2020 08:37:21 -0800 [thread overview]
Message-ID: <4a8a9d8f-22b8-0961-7c31-39eb1fe9cb65@linux.microsoft.com> (raw)
In-Reply-To: <40f8c03a-f08f-d49e-b404-9a6d79873dd1@linux.microsoft.com>
On 12/6/20 5:50 PM, Lakshmi Ramasubramanian wrote:
Hi Thiago,
> On 12/4/20 6:22 PM, Thiago Jung Bauermann wrote
>>
>> Hello Lakshmi,
>>
>> Lakshmi Ramasubramanian <nramas@linux.microsoft.com> writes:
>>
>>> delete_fdt_mem_rsv() retrieves the memory reserve map entry, for
>>> the given starting address and size, from the device tree blob, and
>>> removes the entry from the device tree blob. This function is called
>>> to free the resources reserved for the buffer used for carrying forward
>>> the IMA measurement logs on kexec. This function does not have
>>> architecture specific code, but is currently limited to powerpc.
>>>
>>> Move delete_fdt_mem_rsv() to "drivers/of/kexec_fdt.c" so that it is
>>
>> s/kexec_fdt.c/kexec.c/
>
> Missed that in the patch description. Will fix it. Thanks.
>
>>> accessible for other architectures as well.
>>>
>>> Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
>>> Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
>>> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
>>> ---
>>> arch/powerpc/include/asm/kexec.h | 1 -
>>> arch/powerpc/kexec/file_load.c | 32 -----------------
>>> drivers/of/Makefile | 1 +
>>> drivers/of/kexec.c | 61 ++++++++++++++++++++++++++++++++
>>> include/linux/kexec.h | 5 +++
>>> 5 files changed, 67 insertions(+), 33 deletions(-)
>>> create mode 100644 drivers/of/kexec.c
>>>
>>> diff --git a/arch/powerpc/include/asm/kexec.h
>>> b/arch/powerpc/include/asm/kexec.h
>>> index 55d6ede30c19..7c223031ecdd 100644
>>> --- a/arch/powerpc/include/asm/kexec.h
>>> +++ b/arch/powerpc/include/asm/kexec.h
>>> @@ -126,7 +126,6 @@ int setup_purgatory(struct kimage *image, const
>>> void *slave_code,
>>> int setup_new_fdt(const struct kimage *image, void *fdt,
>>> unsigned long initrd_load_addr, unsigned long initrd_len,
>>> const char *cmdline);
>>> -int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long
>>> size);
>>> #ifdef CONFIG_PPC64
>>> struct kexec_buf;
>>> diff --git a/arch/powerpc/kexec/file_load.c
>>> b/arch/powerpc/kexec/file_load.c
>>> index 9a232bc36c8f..9efc98b1e2ae 100644
>>> --- a/arch/powerpc/kexec/file_load.c
>>> +++ b/arch/powerpc/kexec/file_load.c
>>> @@ -109,38 +109,6 @@ int setup_purgatory(struct kimage *image, const
>>> void *slave_code,
>>> return 0;
>>> }
>>> -/**
>>> - * delete_fdt_mem_rsv - delete memory reservation with given address
>>> and size
>>> - *
>>> - * Return: 0 on success, or negative errno on error.
>>> - */
>>> -int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long
>>> size)
>>> -{
>>> - int i, ret, num_rsvs = fdt_num_mem_rsv(fdt);
>>> -
>>> - for (i = 0; i < num_rsvs; i++) {
>>> - uint64_t rsv_start, rsv_size;
>>> -
>>> - ret = fdt_get_mem_rsv(fdt, i, &rsv_start, &rsv_size);
>>> - if (ret) {
>>> - pr_err("Malformed device tree.\n");
>>> - return -EINVAL;
>>> - }
>>> -
>>> - if (rsv_start == start && rsv_size == size) {
>>> - ret = fdt_del_mem_rsv(fdt, i);
>>> - if (ret) {
>>> - pr_err("Error deleting device tree reservation.\n");
>>> - return -EINVAL;
>>> - }
>>> -
>>> - return 0;
>>> - }
>>> - }
>>> -
>>> - return -ENOENT;
>>> -}
>>> -
>>> /*
>>> * setup_new_fdt - modify /chosen and memory reservation for the
>>> next kernel
>>> * @image: kexec image being loaded.
>>> diff --git a/drivers/of/Makefile b/drivers/of/Makefile
>>> index 6e1e5212f058..77d24712c0c8 100644
>>> --- a/drivers/of/Makefile
>>> +++ b/drivers/of/Makefile
>>> @@ -13,5 +13,6 @@ obj-$(CONFIG_OF_RESERVED_MEM) += of_reserved_mem.o
>>> obj-$(CONFIG_OF_RESOLVE) += resolver.o
>>> obj-$(CONFIG_OF_OVERLAY) += overlay.o
>>> obj-$(CONFIG_OF_NUMA) += of_numa.o
>>> +obj-$(CONFIG_OF_FLATTREE) += kexec.o
>>
>> Isn't this too broad? kexec.o will only be useful to kernel configs
>> which enable CONFIG_KEXEC_FILE, so perhaps do:
>>
>> ifdef CONFIG_OF_FLATTREE
>> ifdef CONFIG_KEXEC_FILE
>> obj-y += kexec.o
>> endif
>> endif
>>
>> What do you think?
>
> Per Rob's feedback on v9 patch set, I have moved all the architecture
> independent ima kexec functions to a single file "drivers/of/kexec.c"
>
> Since these functions are enabled on different kernel CONFIGs, I have
> used IS_ENABLED(CONFIG_XYZ) macro instead of "#ifdef" in the C file to
> conditionally compile.
Per Rob's feedback on the v9 patch, I'll keep the ima kexec functions in
a single file (in "drivers/of/kexec.c") and use IS_ENABLED() macro to
handle the function calls.
I'll make the other changes you'd suggested on v10 patches and will post
v11 patch set shortly.
thanks,
-lakshmi
>
>>
>>> obj-$(CONFIG_OF_UNITTEST) += unittest-data/
>>> diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
>>> new file mode 100644
>>> index 000000000000..b7d59105fcb8
>>> --- /dev/null
>>> +++ b/drivers/of/kexec.c
>>> @@ -0,0 +1,61 @@
>>> +// SPDX-License-Identifier: GPL-2.0+
>>> +/*
>>> + * Copyright (C) 2020 Microsoft Corporation
>>> + *
>>> + * Author: Lakshmi Ramasubramanian (nramas@linux.microsoft.com)
>>> + *
>>> + * File: kexec.c
>>> + * Defines kexec related functions.
>>> + */
>>> +
>>> +#define pr_fmt(fmt) "OF: kexec: " fmt
>>> +
>>> +#include <linux/kernel.h>
>>> +#include <linux/slab.h>
>>> +#include <linux/memblock.h>
>>> +#include <linux/kexec.h>
>>> +#include <linux/of.h>
>>> +#include <linux/of_fdt.h>
>>> +#include <linux/libfdt.h>
>>> +
>>> +/**
>>> + * delete_fdt_mem_rsv - delete memory reservation with given address
>>> and size
>>> + *
>>> + * @fdt: Flattened Device Tree to update
>>> + * @start: Starting address of the reservation to delete
>>> + * @size: Size of the reservation to delete
>>> + *
>>> + * Return: 0 on success, or negative errno on error.
>>> + */
>>> +int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long
>>> size)
>>> +{
>>> + int i, ret, num_rsvs;
>>> +
>>> + if (!IS_ENABLED(CONFIG_KEXEC_FILE))
>>> + return 0;
>>
>> If you agree with my suggestion, then this IS_ENABLED() wouldn't be
>> needed.
>>
>
> Please see my response above.
>
> If there is a way to keep all the ima kexec functions in a single file
> and yet not use "#ifdef" in C file to conditionally compile, please let
> me know. I'll update.
>
> thanks,
> -lakshmi
>
>>> +
>>> + num_rsvs = fdt_num_mem_rsv(fdt);
>>> + for (i = 0; i < num_rsvs; i++) {
>>> + uint64_t rsv_start, rsv_size;
>>> +
>>> + ret = fdt_get_mem_rsv(fdt, i, &rsv_start, &rsv_size);
>>> + if (ret) {
>>> + pr_err("Malformed device tree.\n");
>>> + return -EINVAL;
>>> + }
>>> +
>>> + if (rsv_start == start && rsv_size == size) {
>>> + ret = fdt_del_mem_rsv(fdt, i);
>>> + if (ret) {
>>> + pr_err("Error deleting device tree reservation.\n");
>>> + return -EINVAL;
>>> + }
>>> +
>>> + pr_debug("Freed reserved memory at %lu of size %lu\n",
>>> + start, size);
>>> + return 0;
>>> + }
>>> + }
>>> +
>>> + return -ENOENT;
>>> +}
>>
>> The function code is unchanged apart from the addition of the
>> IS_ENABLED() and the pr_debug(), so that is good.
>>
>>> diff --git a/include/linux/kexec.h b/include/linux/kexec.h
>>> index 9e93bef52968..d0234c4815da 100644
>>> --- a/include/linux/kexec.h
>>> +++ b/include/linux/kexec.h
>>> @@ -407,6 +407,11 @@ static inline int kexec_crash_loaded(void) {
>>> return 0; }
>>> #define kexec_in_progress false
>>> #endif /* CONFIG_KEXEC_CORE */
>>> +#if defined(CONFIG_OF_FLATTREE)
>>
>> This would also change to require CONFIG_KEXEC_FILE.
>>
>>> +extern int delete_fdt_mem_rsv(void *fdt, unsigned long start,
>>> + unsigned long size);
>>> +#endif /* CONFIG_OF_FLATTREE */
>>> +
>>> #endif /* !defined(__ASSEBMLY__) */
>>> #endif /* LINUX_KEXEC_H */
>>
>>
next prev parent reply other threads:[~2020-12-11 17:41 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-04 19:51 [PATCH v10 0/8] Carry forward IMA measurement log on kexec on ARM64 Lakshmi Ramasubramanian
2020-12-04 19:51 ` [PATCH v10 1/8] powerpc: fix compiler warnings and errors Lakshmi Ramasubramanian
2020-12-05 1:20 ` Thiago Jung Bauermann
2020-12-04 19:51 ` [PATCH v10 2/8] powerpc: Move delete_fdt_mem_rsv() to drivers/of/kexec.c Lakshmi Ramasubramanian
2020-12-05 2:22 ` Thiago Jung Bauermann
2020-12-07 1:50 ` Lakshmi Ramasubramanian
2020-12-11 16:37 ` Lakshmi Ramasubramanian [this message]
2020-12-11 18:19 ` Thiago Jung Bauermann
2020-12-11 19:25 ` Lakshmi Ramasubramanian
2020-12-12 1:14 ` Thiago Jung Bauermann
2020-12-04 19:51 ` [PATCH v10 3/8] powerpc: Move ima buffer functions " Lakshmi Ramasubramanian
2020-12-05 19:48 ` Thiago Jung Bauermann
2020-12-07 1:53 ` Lakshmi Ramasubramanian
2020-12-04 19:51 ` [PATCH v10 4/8] powerpc: Use ima kexec node functions Lakshmi Ramasubramanian
2020-12-05 19:51 ` Thiago Jung Bauermann
2020-12-07 1:54 ` Lakshmi Ramasubramanian
2020-12-04 19:51 ` [PATCH v10 5/8] powerpc: Move remove_ima_buffer() to drivers/of/kexec.c Lakshmi Ramasubramanian
2020-12-05 20:14 ` Thiago Jung Bauermann
2020-12-07 1:57 ` Lakshmi Ramasubramanian
2020-12-04 19:51 ` [PATCH v10 6/8] powerpc: Move ima_get_kexec_buffer() and ima_free_kexec_buffer() to ima Lakshmi Ramasubramanian
2020-12-05 21:02 ` Thiago Jung Bauermann
2020-12-07 1:58 ` Lakshmi Ramasubramanian
2020-12-04 19:51 ` [PATCH v10 7/8] powerpc: Move arch_ima_add_kexec_buffer " Lakshmi Ramasubramanian
2020-12-05 21:36 ` Thiago Jung Bauermann
2020-12-07 2:03 ` Lakshmi Ramasubramanian
2020-12-07 14:57 ` Mimi Zohar
2020-12-04 19:51 ` [PATCH v10 8/8] arm64: Add IMA log information in kimage used for kexec Lakshmi Ramasubramanian
2020-12-05 21:44 ` Thiago Jung Bauermann
2020-12-07 2:05 ` Lakshmi Ramasubramanian
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4a8a9d8f-22b8-0961-7c31-39eb1fe9cb65@linux.microsoft.com \
--to=nramas@linux.microsoft.com \
--cc=allison@lohutok.net \
--cc=balajib@linux.microsoft.com \
--cc=bauerman@linux.ibm.com \
--cc=benh@kernel.crashing.org \
--cc=bhsharma@redhat.com \
--cc=catalin.marinas@arm.com \
--cc=christophe.leroy@c-s.fr \
--cc=devicetree@vger.kernel.org \
--cc=dmitry.kasatkin@gmail.com \
--cc=frowand.list@gmail.com \
--cc=gregkh@linuxfoundation.org \
--cc=hsinyi@chromium.org \
--cc=james.morse@arm.com \
--cc=jmorris@namei.org \
--cc=kstewart@linuxfoundation.org \
--cc=linux-integrity@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mark.rutland@arm.com \
--cc=masahiroy@kernel.org \
--cc=mbrugger@suse.com \
--cc=mpe@ellerman.id.au \
--cc=pasha.tatashin@soleen.com \
--cc=paulus@samba.org \
--cc=prsriva@linux.microsoft.com \
--cc=robh+dt@kernel.org \
--cc=robh@kernel.org \
--cc=sashal@kernel.org \
--cc=serge@hallyn.com \
--cc=takahiro.akashi@linaro.org \
--cc=tao.li@vivo.com \
--cc=tglx@linutronix.de \
--cc=vincenzo.frascino@arm.com \
--cc=will@kernel.org \
--cc=zohar@linux.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).