From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anup Patel Date: Sat, 10 Apr 2021 12:48:07 +0530 Subject: [PATCH 6/7] lib: utils: Copy over restricted root domain memregions to FDT domains In-Reply-To: <20210410071808.759856-1-anup.patel@wdc.com> References: <20210410071808.759856-1-anup.patel@wdc.com> Message-ID: <20210410071808.759856-7-anup.patel@wdc.com> List-Id: To: opensbi@lists.infradead.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit We should copy over all restricted memregions from the root domain to the domains populated from FDT. These restricted root memregions are typically firmware memregion and M-mode only mmio memregions. Signed-off-by: Anup Patel --- lib/utils/fdt/fdt_domain.c | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) diff --git a/lib/utils/fdt/fdt_domain.c b/lib/utils/fdt/fdt_domain.c index 09615e5..95c195d 100644 --- a/lib/utils/fdt/fdt_domain.c +++ b/lib/utils/fdt/fdt_domain.c @@ -222,7 +222,7 @@ static u32 fdt_domains_count; static struct sbi_domain fdt_domains[FDT_DOMAIN_MAX_COUNT]; static struct sbi_hartmask fdt_masks[FDT_DOMAIN_MAX_COUNT]; static struct sbi_domain_memregion - fdt_regions[FDT_DOMAIN_MAX_COUNT][FDT_DOMAIN_REGION_MAX_COUNT + 2]; + fdt_regions[FDT_DOMAIN_MAX_COUNT][FDT_DOMAIN_REGION_MAX_COUNT + 1]; static int __fdt_parse_region(void *fdt, int domain_offset, int region_offset, u32 region_access, @@ -276,7 +276,7 @@ static int __fdt_parse_domain(void *fdt, int domain_offset, void *opaque) struct sbi_hartmask *mask; struct sbi_hartmask assign_mask; int *cold_domain_offset = opaque; - struct sbi_domain_memregion *regions; + struct sbi_domain_memregion *reg, *regions; int i, err, len, cpus_offset, cpu_offset, doffset; /* Sanity check on maximum domains we can handle */ @@ -314,13 +314,31 @@ static int __fdt_parse_domain(void *fdt, int domain_offset, void *opaque) /* Setup memregions from DT */ val32 = 0; sbi_memset(regions, 0, - sizeof(*regions) * (FDT_DOMAIN_REGION_MAX_COUNT + 2)); + sizeof(*regions) * (FDT_DOMAIN_REGION_MAX_COUNT + 1)); dom->regions = regions; err = fdt_iterate_each_memregion(fdt, domain_offset, &val32, __fdt_parse_region); if (err) return err; - sbi_domain_memregion_initfw(®ions[val32]); + + /* + * Copy over root domain memregions which don't allow + * read, write and execute from lower privilege modes. + * + * These root domain memregions without read, write, + * and execute permissions include: + * 1) firmware region protecting the firmware memory + * 2) mmio regions protecting M-mode only mmio devices + */ + sbi_domain_for_each_memregion(&root, reg) { + if ((reg->flags & SBI_DOMAIN_MEMREGION_READABLE) || + (reg->flags & SBI_DOMAIN_MEMREGION_WRITEABLE) || + (reg->flags & SBI_DOMAIN_MEMREGION_EXECUTABLE)) + continue; + if (FDT_DOMAIN_REGION_MAX_COUNT <= val32) + return SBI_EINVAL; + sbi_memcpy(®ions[val32++], reg, sizeof(*reg)); + } /* Read "boot-hart" DT property */ val32 = -1U; -- 2.25.1