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Memory regions that are reserved using efi_mem_reserve_persistent() are recorded in a special EFI config table which survives kexec, allowing the incoming kernel to honour them as well. However, such reservations are not visible in /proc/iomem, and so the kexec tools that load the incoming kernel and its initrd into memory may overwrite these reserved regions before the incoming kernel has a chance to reserve them from further use. Address this problem by adding these reservations to /proc/iomem as they are created. Note that reservations that are inherited from a previous kernel are memblock_reserve()'d early on, so they are already visible in /proc/iomem. Tested-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com> Tested-by: Bhupesh Sharma <bhsharma@redhat.com> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Bhupesh Sharma <bhsharma@redhat.com> Cc: <stable@vger.kernel.org> # v5.4+ Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Arvind Sankar <nivedita@alum.mit.edu> Cc: linux-efi@vger.kernel.org Link: https://lkml.kernel.org/r/20191206165542.31469-2-ardb@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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| .. | ||
| arm_scmi | ||
| broadcom | ||
| efi | ||
| imx | ||
| meson | ||
| psci | ||
| tegra | ||
| xilinx | ||
| arm_scpi.c | ||
| arm_sdei.c | ||
| dmi_scan.c | ||
| dmi-id.c | ||
| dmi-sysfs.c | ||
| edd.c | ||
| iscsi_ibft_find.c | ||
| iscsi_ibft.c | ||
| Kconfig | ||
| Makefile | ||
| memmap.c | ||
| pcdp.c | ||
| pcdp.h | ||
| qcom_scm-32.c | ||
| qcom_scm-64.c | ||
| qcom_scm.c | ||
| qcom_scm.h | ||
| qemu_fw_cfg.c | ||
| raspberrypi.c | ||
| scpi_pm_domain.c | ||
| stratix10-rsu.c | ||
| stratix10-svc.c | ||
| ti_sci.c | ||
| ti_sci.h | ||
| trusted_foundations.c | ||
| turris-mox-rwtm.c | ||