[GIT pull] x86 updates for 4.13

From: Thomas Gleixner
Date: Sun Jul 09 2017 - 05:15:09 EST

Linus,

please pull the latest x86-urgent-for-linus git tree from:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-urgent-for-linus

The x86 updates contain:

- A fix for a longstanding PAT bug, where PAT was reported on CPUs that
do not support it, which leads to wrong caching attributes and
missing MTRR updates

- Prevent overwriting of the e820 firmware table, which causes kexec
kernels to lose the fake mptable which is stored there.

- Cleanup of the UV/BAU code, removing unused code and making
local functions static.

Thanks,

tglx

------------------>
Chen Yu (3):
x86/boot/e820: Avoid overwriting e820_table_firmware
x86/boot/e820: Rename the e820_table_firmware to e820_table_kexec
x86/boot/e820: Introduce the bootloader provided e820_table_firmware[] table

Colin Ian King (1):
x86/platform/uv/BAU: Minor cleanup, make some local functions static

Mikulas Patocka (1):
x86/mm/pat: Don't report PAT on CPUs that don't support it


arch/x86/include/asm/e820/api.h | 1 +
arch/x86/include/asm/pat.h | 1 +
arch/x86/kernel/e820.c | 49 ++++++++++++++++++++++++++++-----------
arch/x86/kernel/kexec-bzimage64.c | 4 ++--
arch/x86/kernel/setup.c | 7 ++++++
arch/x86/mm/pat.c | 28 ++++++++++------------
arch/x86/platform/uv/tlb_uv.c | 31 +++++--------------------
7 files changed, 65 insertions(+), 56 deletions(-)

diff --git a/arch/x86/include/asm/e820/api.h b/arch/x86/include/asm/e820/api.h
index 8e0f8b85b209..a504adc661a4 100644
--- a/arch/x86/include/asm/e820/api.h
+++ b/arch/x86/include/asm/e820/api.h
@@ -4,6 +4,7 @@
#include <asm/e820/types.h>

extern struct e820_table *e820_table;
+extern struct e820_table *e820_table_kexec;
extern struct e820_table *e820_table_firmware;

extern unsigned long pci_mem_start;
diff --git a/arch/x86/include/asm/pat.h b/arch/x86/include/asm/pat.h
index 0b1ff4c1c14e..fffb2794dd89 100644
--- a/arch/x86/include/asm/pat.h
+++ b/arch/x86/include/asm/pat.h
@@ -7,6 +7,7 @@
bool pat_enabled(void);
void pat_disable(const char *reason);
extern void pat_init(void);
+extern void init_cache_modes(void);

extern int reserve_memtype(u64 start, u64 end,
enum page_cache_mode req_pcm, enum page_cache_mode *ret_pcm);
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index d78a586ba8dc..532da61d605c 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -20,10 +20,12 @@
#include <asm/setup.h>

/*
- * We organize the E820 table into two main data structures:
+ * We organize the E820 table into three main data structures:
*
* - 'e820_table_firmware': the original firmware version passed to us by the
- * bootloader - not modified by the kernel. We use this to:
+ * bootloader - not modified by the kernel. It is composed of two parts:
+ * the first 128 E820 memory entries in boot_params.e820_table and the remaining
+ * (if any) entries of the SETUP_E820_EXT nodes. We use this to:
*
* - inform the user about the firmware's notion of memory layout
* via /sys/firmware/memmap
@@ -31,6 +33,14 @@
* - the hibernation code uses it to generate a kernel-independent MD5
* fingerprint of the physical memory layout of a system.
*
+ * - 'e820_table_kexec': a slightly modified (by the kernel) firmware version
+ * passed to us by the bootloader - the major difference between
+ * e820_table_firmware[] and this one is that, the latter marks the setup_data
+ * list created by the EFI boot stub as reserved, so that kexec can reuse the
+ * setup_data information in the second kernel. Besides, e820_table_kexec[]
+ * might also be modified by the kexec itself to fake a mptable.
+ * We use this to:
+ *
* - kexec, which is a bootloader in disguise, uses the original E820
* layout to pass to the kexec-ed kernel. This way the original kernel
* can have a restricted E820 map while the kexec()-ed kexec-kernel
@@ -46,9 +56,11 @@
* specific memory layout data during early bootup.
*/
static struct e820_table e820_table_init __initdata;
+static struct e820_table e820_table_kexec_init __initdata;
static struct e820_table e820_table_firmware_init __initdata;

struct e820_table *e820_table __refdata = &e820_table_init;
+struct e820_table *e820_table_kexec __refdata = &e820_table_kexec_init;
struct e820_table *e820_table_firmware __refdata = &e820_table_firmware_init;

/* For PCI or other memory-mapped resources */
@@ -470,9 +482,9 @@ u64 __init e820__range_update(u64 start, u64 size, enum e820_type old_type, enum
return __e820__range_update(e820_table, start, size, old_type, new_type);
}

-static u64 __init e820__range_update_firmware(u64 start, u64 size, enum e820_type old_type, enum e820_type new_type)
+static u64 __init e820__range_update_kexec(u64 start, u64 size, enum e820_type old_type, enum e820_type new_type)
{
- return __e820__range_update(e820_table_firmware, start, size, old_type, new_type);
+ return __e820__range_update(e820_table_kexec, start, size, old_type, new_type);
}

/* Remove a range of memory from the E820 table: */
@@ -546,9 +558,9 @@ void __init e820__update_table_print(void)
e820__print_table("modified");
}

-static void __init e820__update_table_firmware(void)
+static void __init e820__update_table_kexec(void)
{
- e820__update_table(e820_table_firmware);
+ e820__update_table(e820_table_kexec);
}

#define MAX_GAP_END 0x100000000ull
@@ -623,7 +635,7 @@ __init void e820__setup_pci_gap(void)
/*
* Called late during init, in free_initmem().
*
- * Initial e820_table and e820_table_firmware are largish __initdata arrays.
+ * Initial e820_table and e820_table_kexec are largish __initdata arrays.
*
* Copy them to a (usually much smaller) dynamically allocated area that is
* sized precisely after the number of e820 entries.
@@ -643,6 +655,12 @@ __init void e820__reallocate_tables(void)
memcpy(n, e820_table, size);
e820_table = n;

+ size = offsetof(struct e820_table, entries) + sizeof(struct e820_entry)*e820_table_kexec->nr_entries;
+ n = kmalloc(size, GFP_KERNEL);
+ BUG_ON(!n);
+ memcpy(n, e820_table_kexec, size);
+ e820_table_kexec = n;
+
size = offsetof(struct e820_table, entries) + sizeof(struct e820_entry)*e820_table_firmware->nr_entries;
n = kmalloc(size, GFP_KERNEL);
BUG_ON(!n);
@@ -669,6 +687,9 @@ void __init e820__memory_setup_extended(u64 phys_addr, u32 data_len)
__append_e820_table(extmap, entries);
e820__update_table(e820_table);

+ memcpy(e820_table_kexec, e820_table, sizeof(*e820_table_kexec));
+ memcpy(e820_table_firmware, e820_table, sizeof(*e820_table_firmware));
+
early_memunmap(sdata, data_len);
pr_info("e820: extended physical RAM map:\n");
e820__print_table("extended");
@@ -727,7 +748,7 @@ core_initcall(e820__register_nvs_regions);
/*
* Allocate the requested number of bytes with the requsted alignment
* and return (the physical address) to the caller. Also register this
- * range in the 'firmware' E820 table as a reserved range.
+ * range in the 'kexec' E820 table as a reserved range.
*
* This allows kexec to fake a new mptable, as if it came from the real
* system.
@@ -738,9 +759,9 @@ u64 __init e820__memblock_alloc_reserved(u64 size, u64 align)

addr = __memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
if (addr) {
- e820__range_update_firmware(addr, size, E820_TYPE_RAM, E820_TYPE_RESERVED);
- pr_info("e820: update e820_table_firmware for e820__memblock_alloc_reserved()\n");
- e820__update_table_firmware();
+ e820__range_update_kexec(addr, size, E820_TYPE_RAM, E820_TYPE_RESERVED);
+ pr_info("e820: update e820_table_kexec for e820__memblock_alloc_reserved()\n");
+ e820__update_table_kexec();
}

return addr;
@@ -923,13 +944,13 @@ void __init e820__reserve_setup_data(void)
while (pa_data) {
data = early_memremap(pa_data, sizeof(*data));
e820__range_update(pa_data, sizeof(*data)+data->len, E820_TYPE_RAM, E820_TYPE_RESERVED_KERN);
+ e820__range_update_kexec(pa_data, sizeof(*data)+data->len, E820_TYPE_RAM, E820_TYPE_RESERVED_KERN);
pa_data = data->next;
early_memunmap(data, sizeof(*data));
}

e820__update_table(e820_table);
-
- memcpy(e820_table_firmware, e820_table, sizeof(*e820_table_firmware));
+ e820__update_table(e820_table_kexec);

pr_info("extended physical RAM map:\n");
e820__print_table("reserve setup_data");
@@ -1062,6 +1083,7 @@ void __init e820__reserve_resources(void)
res++;
}

+ /* Expose the bootloader-provided memory layout to the sysfs. */
for (i = 0; i < e820_table_firmware->nr_entries; i++) {
struct e820_entry *entry = e820_table_firmware->entries + i;

@@ -1175,6 +1197,7 @@ void __init e820__memory_setup(void)

who = x86_init.resources.memory_setup();

+ memcpy(e820_table_kexec, e820_table, sizeof(*e820_table_kexec));
memcpy(e820_table_firmware, e820_table, sizeof(*e820_table_firmware));

pr_info("e820: BIOS-provided physical RAM map:\n");
diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c
index 9d7fd5e6689a..fb095ba0c02f 100644
--- a/arch/x86/kernel/kexec-bzimage64.c
+++ b/arch/x86/kernel/kexec-bzimage64.c
@@ -100,14 +100,14 @@ static int setup_e820_entries(struct boot_params *params)
{
unsigned int nr_e820_entries;

- nr_e820_entries = e820_table_firmware->nr_entries;
+ nr_e820_entries = e820_table_kexec->nr_entries;

/* TODO: Pass entries more than E820_MAX_ENTRIES_ZEROPAGE in bootparams setup data */
if (nr_e820_entries > E820_MAX_ENTRIES_ZEROPAGE)
nr_e820_entries = E820_MAX_ENTRIES_ZEROPAGE;

params->e820_entries = nr_e820_entries;
- memcpy(&params->e820_table, &e820_table_firmware->entries, nr_e820_entries*sizeof(struct e820_entry));
+ memcpy(&params->e820_table, &e820_table_kexec->entries, nr_e820_entries*sizeof(struct e820_entry));

return 0;
}
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 65622f07e633..3486d0498800 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1076,6 +1076,13 @@ void __init setup_arch(char **cmdline_p)
max_possible_pfn = max_pfn;

/*
+ * This call is required when the CPU does not support PAT. If
+ * mtrr_bp_init() invoked it already via pat_init() the call has no
+ * effect.
+ */
+ init_cache_modes();
+
+ /*
* Define random base addresses for memory sections after max_pfn is
* defined and before each memory section base is used.
*/
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 9b78685b66e6..45979502f64b 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -37,14 +37,14 @@
#undef pr_fmt
#define pr_fmt(fmt) "" fmt

-static bool boot_cpu_done;
-
-static int __read_mostly __pat_enabled = IS_ENABLED(CONFIG_X86_PAT);
-static void init_cache_modes(void);
+static bool __read_mostly boot_cpu_done;
+static bool __read_mostly pat_disabled = !IS_ENABLED(CONFIG_X86_PAT);
+static bool __read_mostly pat_initialized;
+static bool __read_mostly init_cm_done;

void pat_disable(const char *reason)
{
- if (!__pat_enabled)
+ if (pat_disabled)
return;

if (boot_cpu_done) {
@@ -52,10 +52,8 @@ void pat_disable(const char *reason)
return;
}

- __pat_enabled = 0;
+ pat_disabled = true;
pr_info("x86/PAT: %s\n", reason);
-
- init_cache_modes();
}

static int __init nopat(char *str)
@@ -67,7 +65,7 @@ early_param("nopat", nopat);

bool pat_enabled(void)
{
- return !!__pat_enabled;
+ return pat_initialized;
}
EXPORT_SYMBOL_GPL(pat_enabled);

@@ -205,6 +203,8 @@ static void __init_cache_modes(u64 pat)
update_cache_mode_entry(i, cache);
}
pr_info("x86/PAT: Configuration [0-7]: %s\n", pat_msg);
+
+ init_cm_done = true;
}

#define PAT(x, y) ((u64)PAT_ ## y << ((x)*8))
@@ -225,6 +225,7 @@ static void pat_bsp_init(u64 pat)
}

wrmsrl(MSR_IA32_CR_PAT, pat);
+ pat_initialized = true;

__init_cache_modes(pat);
}
@@ -242,10 +243,9 @@ static void pat_ap_init(u64 pat)
wrmsrl(MSR_IA32_CR_PAT, pat);
}

-static void init_cache_modes(void)
+void init_cache_modes(void)
{
u64 pat = 0;
- static int init_cm_done;

if (init_cm_done)
return;
@@ -287,8 +287,6 @@ static void init_cache_modes(void)
}

__init_cache_modes(pat);
-
- init_cm_done = 1;
}

/**
@@ -306,10 +304,8 @@ void pat_init(void)
u64 pat;
struct cpuinfo_x86 *c = &boot_cpu_data;

- if (!pat_enabled()) {
- init_cache_modes();
+ if (pat_disabled)
return;
- }

if ((c->x86_vendor == X86_VENDOR_INTEL) &&
(((c->x86 == 0x6) && (c->x86_model <= 0xd)) ||
diff --git a/arch/x86/platform/uv/tlb_uv.c b/arch/x86/platform/uv/tlb_uv.c
index 2983faab5b18..d4a61ddf9e62 100644
--- a/arch/x86/platform/uv/tlb_uv.c
+++ b/arch/x86/platform/uv/tlb_uv.c
@@ -588,31 +588,11 @@ static unsigned long uv2_3_read_status(unsigned long offset, int rshft, int desc
}

/*
- * Return whether the status of the descriptor that is normally used for this
- * cpu (the one indexed by its hub-relative cpu number) is busy.
- * The status of the original 32 descriptors is always reflected in the 64
- * bits of UVH_LB_BAU_SB_ACTIVATION_STATUS_0.
- * The bit provided by the activation_status_2 register is irrelevant to
- * the status if it is only being tested for busy or not busy.
- */
-int normal_busy(struct bau_control *bcp)
-{
- int cpu = bcp->uvhub_cpu;
- int mmr_offset;
- int right_shift;
-
- mmr_offset = UVH_LB_BAU_SB_ACTIVATION_STATUS_0;
- right_shift = cpu * UV_ACT_STATUS_SIZE;
- return (((((read_lmmr(mmr_offset) >> right_shift) &
- UV_ACT_STATUS_MASK)) << 1) == UV2H_DESC_BUSY);
-}
-
-/*
* Entered when a bau descriptor has gone into a permanent busy wait because
* of a hardware bug.
* Workaround the bug.
*/
-int handle_uv2_busy(struct bau_control *bcp)
+static int handle_uv2_busy(struct bau_control *bcp)
{
struct ptc_stats *stat = bcp->statp;

@@ -917,8 +897,9 @@ static void handle_cmplt(int completion_status, struct bau_desc *bau_desc,
* Returns 1 if it gives up entirely and the original cpu mask is to be
* returned to the kernel.
*/
-int uv_flush_send_and_wait(struct cpumask *flush_mask, struct bau_control *bcp,
- struct bau_desc *bau_desc)
+static int uv_flush_send_and_wait(struct cpumask *flush_mask,
+ struct bau_control *bcp,
+ struct bau_desc *bau_desc)
{
int seq_number = 0;
int completion_stat = 0;
@@ -1212,8 +1193,8 @@ const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask,
* Search the message queue for any 'other' unprocessed message with the
* same software acknowledge resource bit vector as the 'msg' message.
*/
-struct bau_pq_entry *find_another_by_swack(struct bau_pq_entry *msg,
- struct bau_control *bcp)
+static struct bau_pq_entry *find_another_by_swack(struct bau_pq_entry *msg,
+ struct bau_control *bcp)
{
struct bau_pq_entry *msg_next = msg + 1;
unsigned char swack_vec = msg->swack_vec;