diff options
Diffstat (limited to 'arch/s390/boot/ipl_parm.c')
| -rw-r--r-- | arch/s390/boot/ipl_parm.c | 120 |
1 files changed, 97 insertions, 23 deletions
diff --git a/arch/s390/boot/ipl_parm.c b/arch/s390/boot/ipl_parm.c index 9dab596be98e..3c49bde8aa5e 100644 --- a/arch/s390/boot/ipl_parm.c +++ b/arch/s390/boot/ipl_parm.c @@ -1,20 +1,25 @@ // SPDX-License-Identifier: GPL-2.0 +#include <linux/kernel.h> #include <linux/init.h> #include <linux/ctype.h> #include <asm/ebcdic.h> #include <asm/sclp.h> #include <asm/sections.h> #include <asm/boot_data.h> +#include <asm/facility.h> +#include <asm/uv.h> #include "boot.h" char __bootdata(early_command_line)[COMMAND_LINE_SIZE]; -struct ipl_parameter_block __bootdata(early_ipl_block); -int __bootdata(early_ipl_block_valid); +struct ipl_parameter_block __bootdata_preserved(ipl_block); +int __bootdata_preserved(ipl_block_valid); unsigned long __bootdata(memory_end); int __bootdata(memory_end_set); int __bootdata(noexec_disabled); +int kaslr_enabled __section(.data); + static inline int __diag308(unsigned long subcode, void *addr) { register unsigned long _addr asm("0") = (unsigned long)addr; @@ -43,13 +48,15 @@ void store_ipl_parmblock(void) { int rc; - rc = __diag308(DIAG308_STORE, &early_ipl_block); + uv_set_shared(__pa(&ipl_block)); + rc = __diag308(DIAG308_STORE, &ipl_block); + uv_remove_shared(__pa(&ipl_block)); if (rc == DIAG308_RC_OK && - early_ipl_block.hdr.version <= IPL_MAX_SUPPORTED_VERSION) - early_ipl_block_valid = 1; + ipl_block.hdr.version <= IPL_MAX_SUPPORTED_VERSION) + ipl_block_valid = 1; } -static size_t scpdata_length(const char *buf, size_t count) +static size_t scpdata_length(const u8 *buf, size_t count) { while (count) { if (buf[count - 1] != '\0' && buf[count - 1] != ' ') @@ -66,26 +73,26 @@ static size_t ipl_block_get_ascii_scpdata(char *dest, size_t size, size_t i; int has_lowercase; - count = min(size - 1, scpdata_length(ipb->ipl_info.fcp.scp_data, - ipb->ipl_info.fcp.scp_data_len)); + count = min(size - 1, scpdata_length(ipb->fcp.scp_data, + ipb->fcp.scp_data_len)); if (!count) goto out; has_lowercase = 0; for (i = 0; i < count; i++) { - if (!isascii(ipb->ipl_info.fcp.scp_data[i])) { + if (!isascii(ipb->fcp.scp_data[i])) { count = 0; goto out; } - if (!has_lowercase && islower(ipb->ipl_info.fcp.scp_data[i])) + if (!has_lowercase && islower(ipb->fcp.scp_data[i])) has_lowercase = 1; } if (has_lowercase) - memcpy(dest, ipb->ipl_info.fcp.scp_data, count); + memcpy(dest, ipb->fcp.scp_data, count); else for (i = 0; i < count; i++) - dest[i] = tolower(ipb->ipl_info.fcp.scp_data[i]); + dest[i] = tolower(ipb->fcp.scp_data[i]); out: dest[count] = '\0'; return count; @@ -101,14 +108,14 @@ static void append_ipl_block_parm(void) delim = early_command_line + len; /* '\0' character position */ parm = early_command_line + len + 1; /* append right after '\0' */ - switch (early_ipl_block.hdr.pbt) { - case DIAG308_IPL_TYPE_CCW: + switch (ipl_block.pb0_hdr.pbt) { + case IPL_PBT_CCW: rc = ipl_block_get_ascii_vmparm( - parm, COMMAND_LINE_SIZE - len - 1, &early_ipl_block); + parm, COMMAND_LINE_SIZE - len - 1, &ipl_block); break; - case DIAG308_IPL_TYPE_FCP: + case IPL_PBT_FCP: rc = ipl_block_get_ascii_scpdata( - parm, COMMAND_LINE_SIZE - len - 1, &early_ipl_block); + parm, COMMAND_LINE_SIZE - len - 1, &ipl_block); break; } if (rc) { @@ -139,18 +146,77 @@ void setup_boot_command_line(void) strcpy(early_command_line, strim(COMMAND_LINE)); /* append IPL PARM data to the boot command line */ - if (early_ipl_block_valid) + if (!is_prot_virt_guest() && ipl_block_valid) append_ipl_block_parm(); } +static void modify_facility(unsigned long nr, bool clear) +{ + if (clear) + __clear_facility(nr, S390_lowcore.stfle_fac_list); + else + __set_facility(nr, S390_lowcore.stfle_fac_list); +} + +static void check_cleared_facilities(void) +{ + unsigned long als[] = { FACILITIES_ALS }; + int i; + + for (i = 0; i < ARRAY_SIZE(als); i++) { + if ((S390_lowcore.stfle_fac_list[i] & als[i]) != als[i]) { + sclp_early_printk("Warning: The Linux kernel requires facilities cleared via command line option\n"); + print_missing_facilities(); + break; + } + } +} + +static void modify_fac_list(char *str) +{ + unsigned long val, endval; + char *endp; + bool clear; + + while (*str) { + clear = false; + if (*str == '!') { + clear = true; + str++; + } + val = simple_strtoull(str, &endp, 0); + if (str == endp) + break; + str = endp; + if (*str == '-') { + str++; + endval = simple_strtoull(str, &endp, 0); + if (str == endp) + break; + str = endp; + while (val <= endval) { + modify_facility(val, clear); + val++; + } + } else { + modify_facility(val, clear); + } + if (*str != ',') + break; + str++; + } + check_cleared_facilities(); +} + static char command_line_buf[COMMAND_LINE_SIZE] __section(.data); -static void parse_mem_opt(void) +void parse_boot_command_line(void) { char *param, *val; bool enabled; char *args; int rc; + kaslr_enabled = IS_ENABLED(CONFIG_RANDOMIZE_BASE); args = strcpy(command_line_buf, early_command_line); while (*args) { args = next_arg(args, ¶m, &val); @@ -165,16 +231,24 @@ static void parse_mem_opt(void) if (!rc && !enabled) noexec_disabled = 1; } + + if (!strcmp(param, "facilities")) + modify_fac_list(val); + + if (!strcmp(param, "nokaslr")) + kaslr_enabled = 0; } } void setup_memory_end(void) { - parse_mem_opt(); #ifdef CONFIG_CRASH_DUMP - if (!OLDMEM_BASE && early_ipl_block_valid && - early_ipl_block.hdr.pbt == DIAG308_IPL_TYPE_FCP && - early_ipl_block.ipl_info.fcp.opt == DIAG308_IPL_OPT_DUMP) { + if (OLDMEM_BASE) { + kaslr_enabled = 0; + } else if (ipl_block_valid && + ipl_block.pb0_hdr.pbt == IPL_PBT_FCP && + ipl_block.fcp.opt == IPL_PB0_FCP_OPT_DUMP) { + kaslr_enabled = 0; if (!sclp_early_get_hsa_size(&memory_end) && memory_end) memory_end_set = 1; } |