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-rw-r--r--arch/s390/boot/vmem.c7
-rw-r--r--arch/s390/include/asm/hugetlb.h6
-rw-r--r--arch/s390/kvm/interrupt.c16
-rw-r--r--arch/s390/mm/hugetlbpage.c8
-rw-r--r--arch/s390/net/bpf_jit_comp.c27
5 files changed, 44 insertions, 20 deletions
diff --git a/arch/s390/boot/vmem.c b/arch/s390/boot/vmem.c
index 01257ce3b89c..442a74f113cb 100644
--- a/arch/s390/boot/vmem.c
+++ b/arch/s390/boot/vmem.c
@@ -57,6 +57,7 @@ static void kasan_populate_shadow(void)
pmd_t pmd_z = __pmd(__pa(kasan_early_shadow_pte) | _SEGMENT_ENTRY);
pud_t pud_z = __pud(__pa(kasan_early_shadow_pmd) | _REGION3_ENTRY);
p4d_t p4d_z = __p4d(__pa(kasan_early_shadow_pud) | _REGION2_ENTRY);
+ unsigned long memgap_start = 0;
unsigned long untracked_end;
unsigned long start, end;
int i;
@@ -101,8 +102,12 @@ static void kasan_populate_shadow(void)
* +- shadow end ----+---------+- shadow end ---+
*/
- for_each_physmem_usable_range(i, &start, &end)
+ for_each_physmem_usable_range(i, &start, &end) {
kasan_populate(start, end, POPULATE_KASAN_MAP_SHADOW);
+ if (memgap_start && physmem_info.info_source == MEM_DETECT_DIAG260)
+ kasan_populate(memgap_start, start, POPULATE_KASAN_ZERO_SHADOW);
+ memgap_start = end;
+ }
if (IS_ENABLED(CONFIG_KASAN_VMALLOC)) {
untracked_end = VMALLOC_START;
/* shallowly populate kasan shadow for vmalloc and modules */
diff --git a/arch/s390/include/asm/hugetlb.h b/arch/s390/include/asm/hugetlb.h
index f07267875a19..deb198a61039 100644
--- a/arch/s390/include/asm/hugetlb.h
+++ b/arch/s390/include/asm/hugetlb.h
@@ -16,6 +16,8 @@
#define hugepages_supported() (MACHINE_HAS_EDAT1)
void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
+ pte_t *ptep, pte_t pte, unsigned long sz);
+void __set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte);
pte_t huge_ptep_get(pte_t *ptep);
pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
@@ -65,7 +67,7 @@ static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
int changed = !pte_same(huge_ptep_get(ptep), pte);
if (changed) {
huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
- set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
+ __set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
}
return changed;
}
@@ -74,7 +76,7 @@ static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
unsigned long addr, pte_t *ptep)
{
pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep);
- set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
+ __set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
}
static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index c1b47d608a2b..efaebba5ee19 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -303,11 +303,6 @@ static inline u8 gisa_get_ipm_or_restore_iam(struct kvm_s390_gisa_interrupt *gi)
return 0;
}
-static inline int gisa_in_alert_list(struct kvm_s390_gisa *gisa)
-{
- return READ_ONCE(gisa->next_alert) != (u32)virt_to_phys(gisa);
-}
-
static inline void gisa_set_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
{
set_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
@@ -3216,11 +3211,12 @@ void kvm_s390_gisa_destroy(struct kvm *kvm)
if (!gi->origin)
return;
- if (gi->alert.mask)
- KVM_EVENT(3, "vm 0x%pK has unexpected iam 0x%02x",
- kvm, gi->alert.mask);
- while (gisa_in_alert_list(gi->origin))
- cpu_relax();
+ WARN(gi->alert.mask != 0x00,
+ "unexpected non zero alert.mask 0x%02x",
+ gi->alert.mask);
+ gi->alert.mask = 0x00;
+ if (gisa_set_iam(gi->origin, gi->alert.mask))
+ process_gib_alert_list();
hrtimer_cancel(&gi->timer);
gi->origin = NULL;
VM_EVENT(kvm, 3, "gisa 0x%pK destroyed", gisa);
diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c
index c718f2a0de94..297a6d897d5a 100644
--- a/arch/s390/mm/hugetlbpage.c
+++ b/arch/s390/mm/hugetlbpage.c
@@ -142,7 +142,7 @@ static void clear_huge_pte_skeys(struct mm_struct *mm, unsigned long rste)
__storage_key_init_range(paddr, paddr + size - 1);
}
-void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
+void __set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte)
{
unsigned long rste;
@@ -163,6 +163,12 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
set_pte(ptep, __pte(rste));
}
+void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
+ pte_t *ptep, pte_t pte, unsigned long sz)
+{
+ __set_huge_pte_at(mm, addr, ptep, pte);
+}
+
pte_t huge_ptep_get(pte_t *ptep)
{
return __rste_to_pte(pte_val(*ptep));
diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c
index de2fb12120d2..e507692e51e7 100644
--- a/arch/s390/net/bpf_jit_comp.c
+++ b/arch/s390/net/bpf_jit_comp.c
@@ -2066,6 +2066,7 @@ struct bpf_tramp_jit {
* func_addr's original caller
*/
int stack_size; /* Trampoline stack size */
+ int backchain_off; /* Offset of backchain */
int stack_args_off; /* Offset of stack arguments for calling
* func_addr, has to be at the top
*/
@@ -2086,9 +2087,10 @@ struct bpf_tramp_jit {
* for __bpf_prog_enter() return value and
* func_addr respectively
*/
- int r14_off; /* Offset of saved %r14 */
int run_ctx_off; /* Offset of struct bpf_tramp_run_ctx */
int tccnt_off; /* Offset of saved tailcall counter */
+ int r14_off; /* Offset of saved %r14, has to be at the
+ * bottom */
int do_fexit; /* do_fexit: label */
};
@@ -2247,8 +2249,12 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
* Calculate the stack layout.
*/
- /* Reserve STACK_FRAME_OVERHEAD bytes for the callees. */
+ /*
+ * Allocate STACK_FRAME_OVERHEAD bytes for the callees. As the s390x
+ * ABI requires, put our backchain at the end of the allocated memory.
+ */
tjit->stack_size = STACK_FRAME_OVERHEAD;
+ tjit->backchain_off = tjit->stack_size - sizeof(u64);
tjit->stack_args_off = alloc_stack(tjit, nr_stack_args * sizeof(u64));
tjit->reg_args_off = alloc_stack(tjit, nr_reg_args * sizeof(u64));
tjit->ip_off = alloc_stack(tjit, sizeof(u64));
@@ -2256,16 +2262,25 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
tjit->bpf_args_off = alloc_stack(tjit, nr_bpf_args * sizeof(u64));
tjit->retval_off = alloc_stack(tjit, sizeof(u64));
tjit->r7_r8_off = alloc_stack(tjit, 2 * sizeof(u64));
- tjit->r14_off = alloc_stack(tjit, sizeof(u64));
tjit->run_ctx_off = alloc_stack(tjit,
sizeof(struct bpf_tramp_run_ctx));
tjit->tccnt_off = alloc_stack(tjit, sizeof(u64));
- /* The caller has already reserved STACK_FRAME_OVERHEAD bytes. */
- tjit->stack_size -= STACK_FRAME_OVERHEAD;
+ tjit->r14_off = alloc_stack(tjit, sizeof(u64) * 2);
+ /*
+ * In accordance with the s390x ABI, the caller has allocated
+ * STACK_FRAME_OVERHEAD bytes for us. 8 of them contain the caller's
+ * backchain, and the rest we can use.
+ */
+ tjit->stack_size -= STACK_FRAME_OVERHEAD - sizeof(u64);
tjit->orig_stack_args_off = tjit->stack_size + STACK_FRAME_OVERHEAD;
+ /* lgr %r1,%r15 */
+ EMIT4(0xb9040000, REG_1, REG_15);
/* aghi %r15,-stack_size */
EMIT4_IMM(0xa70b0000, REG_15, -tjit->stack_size);
+ /* stg %r1,backchain_off(%r15) */
+ EMIT6_DISP_LH(0xe3000000, 0x0024, REG_1, REG_0, REG_15,
+ tjit->backchain_off);
/* mvc tccnt_off(4,%r15),stack_size+STK_OFF_TCCNT(%r15) */
_EMIT6(0xd203f000 | tjit->tccnt_off,
0xf000 | (tjit->stack_size + STK_OFF_TCCNT));
@@ -2513,7 +2528,7 @@ int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image,
return -E2BIG;
}
- return ret;
+ return tjit.common.prg;
}
bool bpf_jit_supports_subprog_tailcalls(void)
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