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[2003:cb:c70b:e100:38d6:8aa1:11b0:a20a]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-434d52c0bc7sm23531055e9.35.2024.12.04.04.55.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 04 Dec 2024 04:55:22 -0800 (PST) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, linux-s390@vger.kernel.org, virtualization@lists.linux.dev, kvm@vger.kernel.org, linux-fsdevel@vger.kernel.org, kexec@lists.infradead.org, David Hildenbrand , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , Baoquan He , Vivek Goyal , Dave Young , Thomas Huth , Cornelia Huck , Janosch Frank , Claudio Imbrenda , Eric Farman , Andrew Morton Subject: [PATCH v2 12/12] s390/kdump: virtio-mem kdump support (CONFIG_PROC_VMCORE_DEVICE_RAM) Date: Wed, 4 Dec 2024 13:54:43 +0100 Message-ID: <20241204125444.1734652-13-david@redhat.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241204125444.1734652-1-david@redhat.com> References: <20241204125444.1734652-1-david@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Let's add support for including virtio-mem device RAM in the crash dump, setting NEED_PROC_VMCORE_DEVICE_RAM, and implementing elfcorehdr_fill_device_ram_ptload_elf64(). To avoid code duplication, factor out the code to fill a PT_LOAD entry. Signed-off-by: David Hildenbrand --- arch/s390/Kconfig | 1 + arch/s390/kernel/crash_dump.c | 39 ++++++++++++++++++++++++++++------- 2 files changed, 32 insertions(+), 8 deletions(-) diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 0077969170e8..c230bad7f5cc 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -240,6 +240,7 @@ config S390 select MODULES_USE_ELF_RELA select NEED_DMA_MAP_STATE if PCI select NEED_PER_CPU_EMBED_FIRST_CHUNK + select NEED_PROC_VMCORE_DEVICE_RAM if PROC_VMCORE select NEED_SG_DMA_LENGTH if PCI select OLD_SIGACTION select OLD_SIGSUSPEND3 diff --git a/arch/s390/kernel/crash_dump.c b/arch/s390/kernel/crash_dump.c index cd0c93a8fb8b..f699df2a2b11 100644 --- a/arch/s390/kernel/crash_dump.c +++ b/arch/s390/kernel/crash_dump.c @@ -508,6 +508,19 @@ static int get_mem_chunk_cnt(void) return cnt; } =20 +static void fill_ptload(Elf64_Phdr *phdr, unsigned long paddr, + unsigned long vaddr, unsigned long size) +{ + phdr->p_type =3D PT_LOAD; + phdr->p_vaddr =3D vaddr; + phdr->p_offset =3D paddr; + phdr->p_paddr =3D paddr; + phdr->p_filesz =3D size; + phdr->p_memsz =3D size; + phdr->p_flags =3D PF_R | PF_W | PF_X; + phdr->p_align =3D PAGE_SIZE; +} + /* * Initialize ELF loads (new kernel) */ @@ -520,14 +533,8 @@ static void loads_init(Elf64_Phdr *phdr, bool os_info_= has_vm) if (os_info_has_vm) old_identity_base =3D os_info_old_value(OS_INFO_IDENTITY_BASE); for_each_physmem_range(idx, &oldmem_type, &start, &end) { - phdr->p_type =3D PT_LOAD; - phdr->p_vaddr =3D old_identity_base + start; - phdr->p_offset =3D start; - phdr->p_paddr =3D start; - phdr->p_filesz =3D end - start; - phdr->p_memsz =3D end - start; - phdr->p_flags =3D PF_R | PF_W | PF_X; - phdr->p_align =3D PAGE_SIZE; + fill_ptload(phdr, start, old_identity_base + start, + end - start); phdr++; } } @@ -537,6 +544,22 @@ static bool os_info_has_vm(void) return os_info_old_value(OS_INFO_KASLR_OFFSET); } =20 +#ifdef CONFIG_PROC_VMCORE_DEVICE_RAM +/* + * Fill PT_LOAD for a physical memory range owned by a device and detected= by + * its device driver. + */ +void elfcorehdr_fill_device_ram_ptload_elf64(Elf64_Phdr *phdr, + unsigned long long paddr, unsigned long long size) +{ + unsigned long old_identity_base =3D 0; + + if (os_info_has_vm()) + old_identity_base =3D os_info_old_value(OS_INFO_IDENTITY_BASE); + fill_ptload(phdr, paddr, old_identity_base + paddr, size); +} +#endif + /* * Prepare PT_LOAD type program header for kernel image region */ --=20 2.47.1