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From d0164e7e480ad2ffd3fe73fe53c46087e5e137a6 Mon Sep 17 00:00:00 2001
From: Alexander Gordeev <agordeev@linux.ibm.com>
Date: Thu, 7 Dec 2023 16:54:06 +0100
Subject: [PATCH 09/14] s390x: uncouple physical and virtual memory spaces
Rework VTOP and PTOV macros to reflect the future
uncoupling of physical and virtual address spaces
in kernel. Existing versions are not affected.
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
---
defs.h | 20 +++++-
s390x.c | 212 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 228 insertions(+), 4 deletions(-)
diff --git a/defs.h b/defs.h
index 5218a94fe4a4..20237b72a10b 100644
--- a/defs.h
+++ b/defs.h
@@ -4564,9 +4564,9 @@ struct efi_memory_desc_t {
#define _64BIT_
#define MACHINE_TYPE "S390X"
-#define PTOV(X) ((unsigned long)(X)+(machdep->kvbase))
-#define VTOP(X) ((unsigned long)(X)-(machdep->kvbase))
-#define IS_VMALLOC_ADDR(X) (vt->vmalloc_start && (ulong)(X) >= vt->vmalloc_start)
+#define PTOV(X) s390x_PTOV((ulong)(X))
+#define VTOP(X) s390x_VTOP((ulong)(X))
+#define IS_VMALLOC_ADDR(X) s390x_IS_VMALLOC_ADDR(X)
#define PTRS_PER_PTE 512
#define PTRS_PER_PMD 1024
#define PTRS_PER_PGD 2048
@@ -6827,7 +6827,21 @@ void get_s390_panicmsg(char *);
* s390x.c
*/
#ifdef S390X
+
+struct machine_specific
+{
+ ulong (*virt_to_phys)(ulong vaddr);
+ ulong (*phys_to_virt)(ulong paddr);
+ int (*is_vmalloc_addr)(ulong vaddr);
+ ulong __kaslr_offset_phys;
+ ulong amode31_start;
+ ulong amode31_end;
+};
+
void s390x_init(int);
+ulong s390x_PTOV(ulong);
+ulong s390x_VTOP(ulong);
+int s390x_IS_VMALLOC_ADDR(ulong);
void s390x_dump_machdep_table(ulong);
#define display_idt_table() \
error(FATAL, "-d option is not applicable to S390X architecture\n")
diff --git a/s390x.c b/s390x.c
index 957b839a5fa9..794ae825906d 100644
--- a/s390x.c
+++ b/s390x.c
@@ -47,6 +47,7 @@
#define S390X_PSW_MASK_PSTATE 0x0001000000000000UL
#define S390X_LC_VMCORE_INFO 0xe0c
+#define S390X_LC_OS_INFO 0xe18
/*
* Flags for Region and Segment table entries.
@@ -168,6 +169,19 @@ static struct line_number_hook s390x_line_number_hooks[];
static int s390x_is_uvaddr(ulong, struct task_context *);
static int s390x_get_kvaddr_ranges(struct vaddr_range *);
static int set_s390x_max_physmem_bits(void);
+static ulong s390x_generic_VTOP(ulong vaddr);
+static ulong s390x_generic_PTOV(ulong paddr);
+static int s390x_generic_IS_VMALLOC_ADDR(ulong vaddr);
+static ulong s390x_vr_VTOP(ulong vaddr);
+static ulong s390x_vr_PTOV(ulong paddr);
+static int s390x_vr_IS_VMALLOC_ADDR(ulong vaddr);
+static int s390x_vr_is_kvaddr(ulong);
+
+struct machine_specific s390x_machine_specific = {
+ .virt_to_phys = s390x_generic_VTOP,
+ .phys_to_virt = s390x_generic_PTOV,
+ .is_vmalloc_addr = s390x_generic_IS_VMALLOC_ADDR,
+};
/*
* struct lowcore name (old: "_lowcore", new: "lowcore")
@@ -546,6 +560,191 @@ static void s390x_check_kaslr(void)
free(vmcoreinfo);
}
+#define OS_INFO_VERSION_MAJOR 1
+#define OS_INFO_VERSION_MINOR 1
+
+#define OS_INFO_VMCOREINFO 0
+#define OS_INFO_REIPL_BLOCK 1
+#define OS_INFO_FLAGS_ENTRY 2
+#define OS_INFO_RESERVED 3
+#define OS_INFO_IDENTITY_BASE 4
+#define OS_INFO_KASLR_OFFSET 5
+#define OS_INFO_KASLR_OFF_PHYS 6
+#define OS_INFO_VMEMMAP 7
+#define OS_INFO_AMODE31_START 8
+#define OS_INFO_AMODE31_END 9
+
+struct os_info_entry {
+ union {
+ __u64 addr;
+ __u64 val;
+ };
+ __u64 size;
+ __u32 csum;
+} __attribute__((packed));
+
+struct os_info {
+ __u64 magic;
+ __u32 csum;
+ __u16 version_major;
+ __u16 version_minor;
+ __u64 crashkernel_addr;
+ __u64 crashkernel_size;
+ struct os_info_entry entry[10];
+ __u8 reserved[3864];
+} __attribute__((packed));
+
+struct vm_info {
+ __u64 __identity_base;
+ __u64 __kaslr_offset;
+ __u64 __kaslr_offset_phys;
+ __u64 amode31_start;
+ __u64 amode31_end;
+};
+
+static bool
+vmcoreinfo_read_u64(const char *key, __u64 *val)
+{
+ char *string;
+
+ string = pc->read_vmcoreinfo(key);
+ if (string) {
+ *val = strtoul(string, NULL, 16);
+ free(string);
+ return true;
+ }
+
+ return false;
+}
+
+static bool vmcoreinfo_read_vm_info(struct vm_info *_vm_info)
+{
+ struct vm_info vm_info;
+
+ if (!vmcoreinfo_read_u64("IDENTITYBASE", &vm_info.__identity_base) ||
+ !vmcoreinfo_read_u64("KERNELOFFSET", &vm_info.__kaslr_offset) ||
+ !vmcoreinfo_read_u64("KERNELOFFPHYS", &vm_info.__kaslr_offset_phys) ||
+ !vmcoreinfo_read_u64("SAMODE31", &vm_info.amode31_start) ||
+ !vmcoreinfo_read_u64("EAMODE31", &vm_info.amode31_end))
+ return false;
+
+ *_vm_info = vm_info;
+
+ return true;
+}
+
+static bool os_info_read_vm_info(struct vm_info *vm_info)
+{
+ struct os_info os_info;
+ ulong addr;
+
+ if (!readmem(S390X_LC_OS_INFO, PHYSADDR, &addr,
+ sizeof(addr), "s390x os_info ptr",
+ QUIET|RETURN_ON_ERROR))
+ return false;
+
+ if (addr == 0)
+ return true;
+
+ if (!readmem(addr, PHYSADDR, &os_info,
+ offsetof(struct os_info, reserved), "s390x os_info header",
+ QUIET|RETURN_ON_ERROR))
+ return false;
+
+ vm_info->__identity_base = os_info.entry[OS_INFO_IDENTITY_BASE].val;
+ vm_info->__kaslr_offset = os_info.entry[OS_INFO_KASLR_OFFSET].val;
+ vm_info->__kaslr_offset_phys = os_info.entry[OS_INFO_KASLR_OFF_PHYS].val;
+ vm_info->amode31_start = os_info.entry[OS_INFO_AMODE31_START].val;
+ vm_info->amode31_end = os_info.entry[OS_INFO_AMODE31_END].val;
+
+ return true;
+}
+
+static bool vm_info_empty(struct vm_info *vm_info)
+{
+ return !vm_info->__kaslr_offset;
+}
+
+static bool s390x_init_vm(void)
+{
+ struct vm_info vm_info;
+
+ if (pc->flags & PROC_KCORE) {
+ if (!vmcoreinfo_read_vm_info(&vm_info))
+ return true;
+ } else {
+ if (!os_info_read_vm_info(&vm_info))
+ return false;
+ }
+ if (vm_info_empty(&vm_info))
+ return true;
+
+ machdep->identity_map_base = vm_info.__identity_base;
+ machdep->kvbase = vm_info.__kaslr_offset;
+ machdep->machspec->__kaslr_offset_phys = vm_info.__kaslr_offset_phys;
+ machdep->machspec->amode31_start = vm_info.amode31_start;
+ machdep->machspec->amode31_end = vm_info.amode31_end;
+
+ machdep->is_kvaddr = s390x_vr_is_kvaddr;
+ machdep->machspec->virt_to_phys = s390x_vr_VTOP;
+ machdep->machspec->phys_to_virt = s390x_vr_PTOV;
+ machdep->machspec->is_vmalloc_addr = s390x_vr_IS_VMALLOC_ADDR;
+
+ return true;
+}
+
+static ulong s390x_generic_VTOP(ulong vaddr)
+{
+ return vaddr - machdep->kvbase;
+}
+
+static ulong s390x_generic_PTOV(ulong paddr)
+{
+ return paddr + machdep->kvbase;
+}
+
+static int s390x_generic_IS_VMALLOC_ADDR(ulong vaddr)
+{
+ return vt->vmalloc_start && vaddr >= vt->vmalloc_start;
+}
+
+static ulong s390x_vr_VTOP(ulong vaddr)
+{
+ if (vaddr < LOWCORE_SIZE)
+ return vaddr;
+ if ((vaddr < machdep->machspec->amode31_end) &&
+ (vaddr >= machdep->machspec->amode31_start))
+ return vaddr;
+ if (vaddr < machdep->kvbase)
+ return vaddr - machdep->identity_map_base;
+ return vaddr - machdep->kvbase + machdep->machspec->__kaslr_offset_phys;
+}
+
+static ulong s390x_vr_PTOV(ulong paddr)
+{
+ return paddr + machdep->identity_map_base;
+}
+
+static int s390x_vr_IS_VMALLOC_ADDR(ulong vaddr)
+{
+ return (vaddr >= vt->vmalloc_start && vaddr < machdep->kvbase);
+}
+
+ulong s390x_VTOP(ulong vaddr)
+{
+ return machdep->machspec->virt_to_phys(vaddr);
+}
+
+ulong s390x_PTOV(ulong paddr)
+{
+ return machdep->machspec->phys_to_virt(paddr);
+}
+
+int s390x_IS_VMALLOC_ADDR(ulong vaddr)
+{
+ return machdep->machspec->is_vmalloc_addr(vaddr);
+}
+
/*
* Do all necessary machine-specific setup here. This is called several
* times during initialization.
@@ -560,6 +759,7 @@ s390x_init(int when)
machdep->process_elf_notes = s390x_process_elf_notes;
break;
case PRE_SYMTAB:
+ machdep->machspec = &s390x_machine_specific;
machdep->verify_symbol = s390x_verify_symbol;
if (pc->flags & KERNEL_DEBUG_QUERY)
return;
@@ -587,6 +787,8 @@ s390x_init(int when)
machdep->kvbase = 0;
machdep->identity_map_base = 0;
machdep->is_kvaddr = generic_is_kvaddr;
+ if (!s390x_init_vm())
+ error(FATAL, "cannot initialize VM parameters.");
machdep->is_uvaddr = s390x_is_uvaddr;
machdep->eframe_search = s390x_eframe_search;
machdep->back_trace = s390x_back_trace_cmd;
@@ -681,7 +883,9 @@ s390x_dump_machdep_table(ulong arg)
fprintf(fp, " dis_filter: s390x_dis_filter()\n");
fprintf(fp, " cmd_mach: s390x_cmd_mach()\n");
fprintf(fp, " get_smp_cpus: s390x_get_smp_cpus()\n");
- fprintf(fp, " is_kvaddr: generic_is_kvaddr()\n");
+ fprintf(fp, " is_kvaddr: %s()\n", machdep->is_kvaddr == s390x_vr_is_kvaddr ?
+ "s390x_vr_is_kvaddr" :
+ "generic_is_kvaddr");
fprintf(fp, " is_uvaddr: s390x_is_uvaddr()\n");
fprintf(fp, " verify_paddr: generic_verify_paddr()\n");
fprintf(fp, " get_kvaddr_ranges: s390x_get_kvaddr_ranges()\n");
@@ -702,6 +906,12 @@ s390x_dump_machdep_table(ulong arg)
fprintf(fp, " machspec: %lx\n", (ulong)machdep->machspec);
}
+static int
+s390x_vr_is_kvaddr(ulong vaddr)
+{
+ return (vaddr < LOWCORE_SIZE) || (vaddr >= machdep->identity_map_base);
+}
+
/*
* Check if address is in context's address space
*/
--
2.41.0
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