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-rw-r--r--arch/arm/boot/compressed/Makefile2
-rw-r--r--arch/arm/boot/compressed/debug.S28
-rw-r--r--arch/arm/boot/compressed/head-sa1100.S1
-rw-r--r--arch/arm/boot/compressed/head-shark.S1
-rw-r--r--arch/arm/boot/compressed/head.S5
-rw-r--r--arch/arm/include/asm/percpu.h11
-rw-r--r--arch/arm/include/asm/tlb.h27
-rw-r--r--arch/arm/kernel/topology.c2
-rw-r--r--arch/arm/kvm/arm.c15
-rw-r--r--arch/arm/kvm/mmu.c41
10 files changed, 88 insertions, 45 deletions
diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
index 3580d57ea218..79e9bdbfc491 100644
--- a/arch/arm/boot/compressed/Makefile
+++ b/arch/arm/boot/compressed/Makefile
@@ -124,7 +124,7 @@ KBUILD_CFLAGS = $(subst -pg, , $(ORIG_CFLAGS))
endif
ccflags-y := -fpic -mno-single-pic-base -fno-builtin -I$(obj)
-asflags-y := -Wa,-march=all -DZIMAGE
+asflags-y := -DZIMAGE
# Supply kernel BSS size to the decompressor via a linker symbol.
KBSS_SZ = $(shell $(CROSS_COMPILE)size $(obj)/../../../../vmlinux | \
diff --git a/arch/arm/boot/compressed/debug.S b/arch/arm/boot/compressed/debug.S
index 6e8382d5b7a4..5392ee63338f 100644
--- a/arch/arm/boot/compressed/debug.S
+++ b/arch/arm/boot/compressed/debug.S
@@ -1,6 +1,8 @@
#include <linux/linkage.h>
#include <asm/assembler.h>
+#ifndef CONFIG_DEBUG_SEMIHOSTING
+
#include CONFIG_DEBUG_LL_INCLUDE
ENTRY(putc)
@@ -10,3 +12,29 @@ ENTRY(putc)
busyuart r3, r1
mov pc, lr
ENDPROC(putc)
+
+#else
+
+ENTRY(putc)
+ adr r1, 1f
+ ldmia r1, {r2, r3}
+ add r2, r2, r1
+ ldr r1, [r2, r3]
+ strb r0, [r1]
+ mov r0, #0x03 @ SYS_WRITEC
+ ARM( svc #0x123456 )
+ THUMB( svc #0xab )
+ mov pc, lr
+ .align 2
+1: .word _GLOBAL_OFFSET_TABLE_ - .
+ .word semi_writec_buf(GOT)
+ENDPROC(putc)
+
+ .bss
+ .global semi_writec_buf
+ .type semi_writec_buf, %object
+semi_writec_buf:
+ .space 4
+ .size semi_writec_buf, 4
+
+#endif
diff --git a/arch/arm/boot/compressed/head-sa1100.S b/arch/arm/boot/compressed/head-sa1100.S
index 6179d94dd5c6..3115e313d9f6 100644
--- a/arch/arm/boot/compressed/head-sa1100.S
+++ b/arch/arm/boot/compressed/head-sa1100.S
@@ -11,6 +11,7 @@
#include <asm/mach-types.h>
.section ".start", "ax"
+ .arch armv4
__SA1100_start:
diff --git a/arch/arm/boot/compressed/head-shark.S b/arch/arm/boot/compressed/head-shark.S
index 089c560e07f1..92b56897ed64 100644
--- a/arch/arm/boot/compressed/head-shark.S
+++ b/arch/arm/boot/compressed/head-shark.S
@@ -18,6 +18,7 @@
.section ".start", "ax"
+ .arch armv4
b __beginning
__ofw_data: .long 0 @ the number of memory blocks
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index fe4d9c3ad761..032a8d987148 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -11,6 +11,7 @@
#include <linux/linkage.h>
#include <asm/assembler.h>
+ .arch armv7-a
/*
* Debugging stuff
*
@@ -805,8 +806,8 @@ call_cache_fn: adr r12, proc_types
.align 2
.type proc_types,#object
proc_types:
- .word 0x00000000 @ old ARM ID
- .word 0x0000f000
+ .word 0x41000000 @ old ARM ID
+ .word 0xff00f000
mov pc, lr
THUMB( nop )
mov pc, lr
diff --git a/arch/arm/include/asm/percpu.h b/arch/arm/include/asm/percpu.h
index 968c0a14e0a3..209e6504922e 100644
--- a/arch/arm/include/asm/percpu.h
+++ b/arch/arm/include/asm/percpu.h
@@ -30,8 +30,15 @@ static inline void set_my_cpu_offset(unsigned long off)
static inline unsigned long __my_cpu_offset(void)
{
unsigned long off;
- /* Read TPIDRPRW */
- asm("mrc p15, 0, %0, c13, c0, 4" : "=r" (off) : : "memory");
+ register unsigned long *sp asm ("sp");
+
+ /*
+ * Read TPIDRPRW.
+ * We want to allow caching the value, so avoid using volatile and
+ * instead use a fake stack read to hazard against barrier().
+ */
+ asm("mrc p15, 0, %0, c13, c0, 4" : "=r" (off) : "Q" (*sp));
+
return off;
}
#define __my_cpu_offset __my_cpu_offset()
diff --git a/arch/arm/include/asm/tlb.h b/arch/arm/include/asm/tlb.h
index 99a19512ee26..bdf2b8458ec1 100644
--- a/arch/arm/include/asm/tlb.h
+++ b/arch/arm/include/asm/tlb.h
@@ -33,18 +33,6 @@
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
-/*
- * We need to delay page freeing for SMP as other CPUs can access pages
- * which have been removed but not yet had their TLB entries invalidated.
- * Also, as ARMv7 speculative prefetch can drag new entries into the TLB,
- * we need to apply this same delaying tactic to ensure correct operation.
- */
-#if defined(CONFIG_SMP) || defined(CONFIG_CPU_32v7)
-#define tlb_fast_mode(tlb) 0
-#else
-#define tlb_fast_mode(tlb) 1
-#endif
-
#define MMU_GATHER_BUNDLE 8
/*
@@ -112,12 +100,10 @@ static inline void __tlb_alloc_page(struct mmu_gather *tlb)
static inline void tlb_flush_mmu(struct mmu_gather *tlb)
{
tlb_flush(tlb);
- if (!tlb_fast_mode(tlb)) {
- free_pages_and_swap_cache(tlb->pages, tlb->nr);
- tlb->nr = 0;
- if (tlb->pages == tlb->local)
- __tlb_alloc_page(tlb);
- }
+ free_pages_and_swap_cache(tlb->pages, tlb->nr);
+ tlb->nr = 0;
+ if (tlb->pages == tlb->local)
+ __tlb_alloc_page(tlb);
}
static inline void
@@ -178,11 +164,6 @@ tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
{
- if (tlb_fast_mode(tlb)) {
- free_page_and_swap_cache(page);
- return 1; /* avoid calling tlb_flush_mmu */
- }
-
tlb->pages[tlb->nr++] = page;
VM_BUG_ON(tlb->nr > tlb->max);
return tlb->max - tlb->nr;
diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
index f10316b4ecdc..c5a59546a256 100644
--- a/arch/arm/kernel/topology.c
+++ b/arch/arm/kernel/topology.c
@@ -13,6 +13,7 @@
#include <linux/cpu.h>
#include <linux/cpumask.h>
+#include <linux/export.h>
#include <linux/init.h>
#include <linux/percpu.h>
#include <linux/node.h>
@@ -200,6 +201,7 @@ static inline void update_cpu_power(unsigned int cpuid, unsigned int mpidr) {}
* cpu topology table
*/
struct cputopo_arm cpu_topology[NR_CPUS];
+EXPORT_SYMBOL_GPL(cpu_topology);
const struct cpumask *cpu_coregroup_mask(int cpu)
{
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index 37d216d814cd..ef1703b9587b 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -492,6 +492,11 @@ static void vcpu_pause(struct kvm_vcpu *vcpu)
wait_event_interruptible(*wq, !vcpu->arch.pause);
}
+static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
+{
+ return vcpu->arch.target >= 0;
+}
+
/**
* kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
* @vcpu: The VCPU pointer
@@ -508,8 +513,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
int ret;
sigset_t sigsaved;
- /* Make sure they initialize the vcpu with KVM_ARM_VCPU_INIT */
- if (unlikely(vcpu->arch.target < 0))
+ if (unlikely(!kvm_vcpu_initialized(vcpu)))
return -ENOEXEC;
ret = kvm_vcpu_first_run_init(vcpu);
@@ -710,6 +714,10 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
case KVM_SET_ONE_REG:
case KVM_GET_ONE_REG: {
struct kvm_one_reg reg;
+
+ if (unlikely(!kvm_vcpu_initialized(vcpu)))
+ return -ENOEXEC;
+
if (copy_from_user(&reg, argp, sizeof(reg)))
return -EFAULT;
if (ioctl == KVM_SET_ONE_REG)
@@ -722,6 +730,9 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
struct kvm_reg_list reg_list;
unsigned n;
+ if (unlikely(!kvm_vcpu_initialized(vcpu)))
+ return -ENOEXEC;
+
if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
return -EFAULT;
n = reg_list.n;
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index 965706578f13..84ba67b982c0 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -43,7 +43,14 @@ static phys_addr_t hyp_idmap_vector;
static void kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
{
- kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, kvm, ipa);
+ /*
+ * This function also gets called when dealing with HYP page
+ * tables. As HYP doesn't have an associated struct kvm (and
+ * the HYP page tables are fairly static), we don't do
+ * anything there.
+ */
+ if (kvm)
+ kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, kvm, ipa);
}
static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
@@ -78,18 +85,20 @@ static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc)
return p;
}
-static void clear_pud_entry(pud_t *pud)
+static void clear_pud_entry(struct kvm *kvm, pud_t *pud, phys_addr_t addr)
{
pmd_t *pmd_table = pmd_offset(pud, 0);
pud_clear(pud);
+ kvm_tlb_flush_vmid_ipa(kvm, addr);
pmd_free(NULL, pmd_table);
put_page(virt_to_page(pud));
}
-static void clear_pmd_entry(pmd_t *pmd)
+static void clear_pmd_entry(struct kvm *kvm, pmd_t *pmd, phys_addr_t addr)
{
pte_t *pte_table = pte_offset_kernel(pmd, 0);
pmd_clear(pmd);
+ kvm_tlb_flush_vmid_ipa(kvm, addr);
pte_free_kernel(NULL, pte_table);
put_page(virt_to_page(pmd));
}
@@ -100,11 +109,12 @@ static bool pmd_empty(pmd_t *pmd)
return page_count(pmd_page) == 1;
}
-static void clear_pte_entry(pte_t *pte)
+static void clear_pte_entry(struct kvm *kvm, pte_t *pte, phys_addr_t addr)
{
if (pte_present(*pte)) {
kvm_set_pte(pte, __pte(0));
put_page(virt_to_page(pte));
+ kvm_tlb_flush_vmid_ipa(kvm, addr);
}
}
@@ -114,7 +124,8 @@ static bool pte_empty(pte_t *pte)
return page_count(pte_page) == 1;
}
-static void unmap_range(pgd_t *pgdp, unsigned long long start, u64 size)
+static void unmap_range(struct kvm *kvm, pgd_t *pgdp,
+ unsigned long long start, u64 size)
{
pgd_t *pgd;
pud_t *pud;
@@ -138,15 +149,15 @@ static void unmap_range(pgd_t *pgdp, unsigned long long start, u64 size)
}
pte = pte_offset_kernel(pmd, addr);
- clear_pte_entry(pte);
+ clear_pte_entry(kvm, pte, addr);
range = PAGE_SIZE;
/* If we emptied the pte, walk back up the ladder */
if (pte_empty(pte)) {
- clear_pmd_entry(pmd);
+ clear_pmd_entry(kvm, pmd, addr);
range = PMD_SIZE;
if (pmd_empty(pmd)) {
- clear_pud_entry(pud);
+ clear_pud_entry(kvm, pud, addr);
range = PUD_SIZE;
}
}
@@ -165,14 +176,14 @@ void free_boot_hyp_pgd(void)
mutex_lock(&kvm_hyp_pgd_mutex);
if (boot_hyp_pgd) {
- unmap_range(boot_hyp_pgd, hyp_idmap_start, PAGE_SIZE);
- unmap_range(boot_hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
+ unmap_range(NULL, boot_hyp_pgd, hyp_idmap_start, PAGE_SIZE);
+ unmap_range(NULL, boot_hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
kfree(boot_hyp_pgd);
boot_hyp_pgd = NULL;
}
if (hyp_pgd)
- unmap_range(hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
+ unmap_range(NULL, hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
kfree(init_bounce_page);
init_bounce_page = NULL;
@@ -200,9 +211,10 @@ void free_hyp_pgds(void)
if (hyp_pgd) {
for (addr = PAGE_OFFSET; virt_addr_valid(addr); addr += PGDIR_SIZE)
- unmap_range(hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE);
+ unmap_range(NULL, hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE);
for (addr = VMALLOC_START; is_vmalloc_addr((void*)addr); addr += PGDIR_SIZE)
- unmap_range(hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE);
+ unmap_range(NULL, hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE);
+
kfree(hyp_pgd);
hyp_pgd = NULL;
}
@@ -393,7 +405,7 @@ int kvm_alloc_stage2_pgd(struct kvm *kvm)
*/
static void unmap_stage2_range(struct kvm *kvm, phys_addr_t start, u64 size)
{
- unmap_range(kvm->arch.pgd, start, size);
+ unmap_range(kvm, kvm->arch.pgd, start, size);
}
/**
@@ -675,7 +687,6 @@ static void handle_hva_to_gpa(struct kvm *kvm,
static void kvm_unmap_hva_handler(struct kvm *kvm, gpa_t gpa, void *data)
{
unmap_stage2_range(kvm, gpa, PAGE_SIZE);
- kvm_tlb_flush_vmid_ipa(kvm, gpa);
}
int kvm_unmap_hva(struct kvm *kvm, unsigned long hva)