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powerpc fixes for 5.1 #3 

One fix for a boot failure on 32-bit, introduced during the merge window.
 
 A fix for our handling of CLOCK_MONOTONIC in the 64-bit VDSO. Changing the wall
 clock across the Y2038 boundary could cause CLOCK_MONOTONIC to jump forward and
 backward.
 
 Our spectre_v2 reporting was a bit confusing due to a bug I introduced. On some
 systems it was reporting that the count cache was disabled and also that we were
 flushing the count cache on context switch. Only the former is true, and given
 that the count cache is disabled it doesn't make any sense to flush it. No one
 reported it, so presumably the presence of any mitigation is all people check
 for.
 
 Finally a small build fix for zsmalloc on 32-bit.
 
 Thanks to:
   Ben Hutchings, Christophe Leroy, Diana Craciun, Guenter Roeck, Michael Neuling.
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Merge tag 'powerpc-5.1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:
 "One fix for a boot failure on 32-bit, introduced during the merge
  window.

  A fix for our handling of CLOCK_MONOTONIC in the 64-bit VDSO. Changing
  the wall clock across the Y2038 boundary could cause CLOCK_MONOTONIC
  to jump forward and backward.

  Our spectre_v2 reporting was a bit confusing due to a bug I
  introduced. On some systems it was reporting that the count cache was
  disabled and also that we were flushing the count cache on context
  switch. Only the former is true, and given that the count cache is
  disabled it doesn't make any sense to flush it. No one reported it, so
  presumably the presence of any mitigation is all people check for.

  Finally a small build fix for zsmalloc on 32-bit.

  Thanks to: Ben Hutchings, Christophe Leroy, Diana Craciun, Guenter
  Roeck, Michael Neuling"

* tag 'powerpc-5.1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/security: Fix spectre_v2 reporting
  powerpc/mm: Only define MAX_PHYSMEM_BITS in SPARSEMEM configurations
  powerpc/6xx: fix setup and use of SPRN_SPRG_PGDIR for hash32
  powerpc/vdso64: Fix CLOCK_MONOTONIC inconsistencies across Y2038
This commit is contained in:
Linus Torvalds 2019-03-22 14:15:11 -07:00
parent 070c95d457 92edf8df0f
commit a5ed1e96ca
7 changed files with 25 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/include/asm/mmu.h
View File

@ -352,7 +352,7 @@ static inline bool strict_kernel_rwx_enabled(void)
#if defined(CONFIG_SPARSEMEM_VMEMMAP) && defined(CONFIG_SPARSEMEM_EXTREME) && \
defined (CONFIG_PPC_64K_PAGES)
#define MAX_PHYSMEM_BITS 51
#else
#elif defined(CONFIG_SPARSEMEM)
#define MAX_PHYSMEM_BITS 46
#endif

8
arch/powerpc/include/asm/vdso_datapage.h
View File

@ -82,10 +82,10 @@ struct vdso_data {
__u32 icache_block_size; /* L1 i-cache block size */
__u32 dcache_log_block_size; /* L1 d-cache log block size */
__u32 icache_log_block_size; /* L1 i-cache log block size */
__s32 wtom_clock_sec; /* Wall to monotonic clock */
__s32 wtom_clock_nsec;
struct timespec stamp_xtime; /* xtime as at tb_orig_stamp */
__u32 stamp_sec_fraction; /* fractional seconds of stamp_xtime */
__u32 stamp_sec_fraction; /* fractional seconds of stamp_xtime */
__s32 wtom_clock_nsec; /* Wall to monotonic clock nsec */
__s64 wtom_clock_sec; /* Wall to monotonic clock sec */
struct timespec stamp_xtime; /* xtime as at tb_orig_stamp */
__u32 syscall_map_64[SYSCALL_MAP_SIZE]; /* map of syscalls */
__u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
};

3
arch/powerpc/kernel/cpu_setup_6xx.S
View File

@ -24,9 +24,6 @@ BEGIN_MMU_FTR_SECTION
li r10,0
mtspr SPRN_SPRG_603_LRU,r10 /* init SW LRU tracking */
END_MMU_FTR_SECTION_IFSET(MMU_FTR_NEED_DTLB_SW_LRU)
lis r10, (swapper_pg_dir - PAGE_OFFSET)@h
ori r10, r10, (swapper_pg_dir - PAGE_OFFSET)@l
mtspr SPRN_SPRG_PGDIR, r10
BEGIN_FTR_SECTION
bl __init_fpu_registers

6
arch/powerpc/kernel/head_32.S
View File

@ -855,6 +855,9 @@ __secondary_start:
li r3,0
stw r3, RTAS_SP(r4) /* 0 => not in RTAS */
#endif
lis r4, (swapper_pg_dir - PAGE_OFFSET)@h
ori r4, r4, (swapper_pg_dir - PAGE_OFFSET)@l
mtspr SPRN_SPRG_PGDIR, r4
/* enable MMU and jump to start_secondary */
li r4,MSR_KERNEL
@ -942,6 +945,9 @@ start_here:
li r3,0
stw r3, RTAS_SP(r4) /* 0 => not in RTAS */
#endif
lis r4, (swapper_pg_dir - PAGE_OFFSET)@h
ori r4, r4, (swapper_pg_dir - PAGE_OFFSET)@l
mtspr SPRN_SPRG_PGDIR, r4
/* stack */
lis r1,init_thread_union@ha

23
arch/powerpc/kernel/security.c
View File

@ -190,29 +190,22 @@ ssize_t cpu_show_spectre_v2(struct device *dev, struct device_attribute *attr, c
bcs = security_ftr_enabled(SEC_FTR_BCCTRL_SERIALISED);
ccd = security_ftr_enabled(SEC_FTR_COUNT_CACHE_DISABLED);
if (bcs || ccd || count_cache_flush_type != COUNT_CACHE_FLUSH_NONE) {
bool comma = false;
if (bcs || ccd) {
seq_buf_printf(&s, "Mitigation: ");
if (bcs) {
if (bcs)
seq_buf_printf(&s, "Indirect branch serialisation (kernel only)");
comma = true;
}
if (ccd) {
if (comma)
seq_buf_printf(&s, ", ");
seq_buf_printf(&s, "Indirect branch cache disabled");
comma = true;
}
if (comma)
if (bcs && ccd)
seq_buf_printf(&s, ", ");
seq_buf_printf(&s, "Software count cache flush");
if (ccd)
seq_buf_printf(&s, "Indirect branch cache disabled");
} else if (count_cache_flush_type != COUNT_CACHE_FLUSH_NONE) {
seq_buf_printf(&s, "Mitigation: Software count cache flush");
if (count_cache_flush_type == COUNT_CACHE_FLUSH_HW)
seq_buf_printf(&s, "(hardware accelerated)");
seq_buf_printf(&s, " (hardware accelerated)");
} else if (btb_flush_enabled) {
seq_buf_printf(&s, "Mitigation: Branch predictor state flush");
} else {

4
arch/powerpc/kernel/vdso64/gettimeofday.S
View File

@ -92,7 +92,7 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime)
* At this point, r4,r5 contain our sec/nsec values.
*/
lwa r6,WTOM_CLOCK_SEC(r3)
ld r6,WTOM_CLOCK_SEC(r3)
lwa r9,WTOM_CLOCK_NSEC(r3)
/* We now have our result in r6,r9. We create a fake dependency
@ -125,7 +125,7 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime)
bne cr6,75f
/* CLOCK_MONOTONIC_COARSE */
lwa r6,WTOM_CLOCK_SEC(r3)
ld r6,WTOM_CLOCK_SEC(r3)
lwa r9,WTOM_CLOCK_NSEC(r3)
/* check if counter has updated */

8
arch/powerpc/mm/hash_low_32.S
View File

@ -70,12 +70,12 @@ _GLOBAL(hash_page)
lis r0,KERNELBASE@h /* check if kernel address */
cmplw 0,r4,r0
ori r3,r3,_PAGE_USER|_PAGE_PRESENT /* test low addresses as user */
mfspr r5, SPRN_SPRG_PGDIR /* virt page-table root */
mfspr r5, SPRN_SPRG_PGDIR /* phys page-table root */
blt+ 112f /* assume user more likely */
lis r5,swapper_pg_dir@ha /* if kernel address, use */
addi r5,r5,swapper_pg_dir@l /* kernel page table */
lis r5, (swapper_pg_dir - PAGE_OFFSET)@ha /* if kernel address, use */
addi r5 ,r5 ,(swapper_pg_dir - PAGE_OFFSET)@l /* kernel page table */
rlwimi r3,r9,32-12,29,29 /* MSR_PR -> _PAGE_USER */
112: tophys(r5, r5)
112:
#ifndef CONFIG_PTE_64BIT
rlwimi r5,r4,12,20,29 /* insert top 10 bits of address */
lwz r8,0(r5) /* get pmd entry */