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Diffstat (limited to 'arch/mips/kvm/tlb.c')
-rw-r--r--arch/mips/kvm/tlb.c291
1 files changed, 61 insertions, 230 deletions
diff --git a/arch/mips/kvm/tlb.c b/arch/mips/kvm/tlb.c
index 254377d8e0b9..2819eb793345 100644
--- a/arch/mips/kvm/tlb.c
+++ b/arch/mips/kvm/tlb.c
@@ -33,28 +33,20 @@
#define KVM_GUEST_PC_TLB 0
#define KVM_GUEST_SP_TLB 1
-atomic_t kvm_mips_instance;
-EXPORT_SYMBOL_GPL(kvm_mips_instance);
-
static u32 kvm_mips_get_kernel_asid(struct kvm_vcpu *vcpu)
{
+ struct mm_struct *kern_mm = &vcpu->arch.guest_kernel_mm;
int cpu = smp_processor_id();
- return vcpu->arch.guest_kernel_asid[cpu] &
- cpu_asid_mask(&cpu_data[cpu]);
+ return cpu_asid(cpu, kern_mm);
}
static u32 kvm_mips_get_user_asid(struct kvm_vcpu *vcpu)
{
+ struct mm_struct *user_mm = &vcpu->arch.guest_user_mm;
int cpu = smp_processor_id();
- return vcpu->arch.guest_user_asid[cpu] &
- cpu_asid_mask(&cpu_data[cpu]);
-}
-
-inline u32 kvm_mips_get_commpage_asid(struct kvm_vcpu *vcpu)
-{
- return vcpu->kvm->arch.commpage_tlb;
+ return cpu_asid(cpu, user_mm);
}
/* Structure defining an tlb entry data set. */
@@ -104,109 +96,6 @@ void kvm_mips_dump_guest_tlbs(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_mips_dump_guest_tlbs);
-/* XXXKYMA: Must be called with interrupts disabled */
-/* set flush_dcache_mask == 0 if no dcache flush required */
-int kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi,
- unsigned long entrylo0, unsigned long entrylo1,
- int flush_dcache_mask)
-{
- unsigned long flags;
- unsigned long old_entryhi;
- int idx;
-
- local_irq_save(flags);
-
- old_entryhi = read_c0_entryhi();
- write_c0_entryhi(entryhi);
- mtc0_tlbw_hazard();
-
- tlb_probe();
- tlb_probe_hazard();
- idx = read_c0_index();
-
- if (idx > current_cpu_data.tlbsize) {
- kvm_err("%s: Invalid Index: %d\n", __func__, idx);
- kvm_mips_dump_host_tlbs();
- local_irq_restore(flags);
- return -1;
- }
-
- write_c0_entrylo0(entrylo0);
- write_c0_entrylo1(entrylo1);
- mtc0_tlbw_hazard();
-
- if (idx < 0)
- tlb_write_random();
- else
- tlb_write_indexed();
- tlbw_use_hazard();
-
- kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0(R): 0x%08lx, entrylo1(R): 0x%08lx\n",
- vcpu->arch.pc, idx, read_c0_entryhi(),
- read_c0_entrylo0(), read_c0_entrylo1());
-
- /* Flush D-cache */
- if (flush_dcache_mask) {
- if (entrylo0 & ENTRYLO_V) {
- ++vcpu->stat.flush_dcache_exits;
- flush_data_cache_page((entryhi & VPN2_MASK) &
- ~flush_dcache_mask);
- }
- if (entrylo1 & ENTRYLO_V) {
- ++vcpu->stat.flush_dcache_exits;
- flush_data_cache_page(((entryhi & VPN2_MASK) &
- ~flush_dcache_mask) |
- (0x1 << PAGE_SHIFT));
- }
- }
-
- /* Restore old ASID */
- write_c0_entryhi(old_entryhi);
- mtc0_tlbw_hazard();
- local_irq_restore(flags);
- return 0;
-}
-EXPORT_SYMBOL_GPL(kvm_mips_host_tlb_write);
-
-int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr,
- struct kvm_vcpu *vcpu)
-{
- kvm_pfn_t pfn;
- unsigned long flags, old_entryhi = 0, vaddr = 0;
- unsigned long entrylo[2] = { 0, 0 };
- unsigned int pair_idx;
-
- pfn = PFN_DOWN(virt_to_phys(vcpu->arch.kseg0_commpage));
- pair_idx = (badvaddr >> PAGE_SHIFT) & 1;
- entrylo[pair_idx] = mips3_paddr_to_tlbpfn(pfn << PAGE_SHIFT) |
- ((_page_cachable_default >> _CACHE_SHIFT) << ENTRYLO_C_SHIFT) |
- ENTRYLO_D | ENTRYLO_V;
-
- local_irq_save(flags);
-
- old_entryhi = read_c0_entryhi();
- vaddr = badvaddr & (PAGE_MASK << 1);
- write_c0_entryhi(vaddr | kvm_mips_get_kernel_asid(vcpu));
- write_c0_entrylo0(entrylo[0]);
- write_c0_entrylo1(entrylo[1]);
- write_c0_index(kvm_mips_get_commpage_asid(vcpu));
- mtc0_tlbw_hazard();
- tlb_write_indexed();
- tlbw_use_hazard();
-
- kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0 (R): 0x%08lx, entrylo1(R): 0x%08lx\n",
- vcpu->arch.pc, read_c0_index(), read_c0_entryhi(),
- read_c0_entrylo0(), read_c0_entrylo1());
-
- /* Restore old ASID */
- write_c0_entryhi(old_entryhi);
- mtc0_tlbw_hazard();
- local_irq_restore(flags);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(kvm_mips_handle_commpage_tlb_fault);
-
int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long entryhi)
{
int i;
@@ -228,51 +117,11 @@ int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long entryhi)
}
EXPORT_SYMBOL_GPL(kvm_mips_guest_tlb_lookup);
-int kvm_mips_host_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long vaddr)
-{
- unsigned long old_entryhi, flags;
- int idx;
-
- local_irq_save(flags);
-
- old_entryhi = read_c0_entryhi();
-
- if (KVM_GUEST_KERNEL_MODE(vcpu))
- write_c0_entryhi((vaddr & VPN2_MASK) |
- kvm_mips_get_kernel_asid(vcpu));
- else {
- write_c0_entryhi((vaddr & VPN2_MASK) |
- kvm_mips_get_user_asid(vcpu));
- }
-
- mtc0_tlbw_hazard();
-
- tlb_probe();
- tlb_probe_hazard();
- idx = read_c0_index();
-
- /* Restore old ASID */
- write_c0_entryhi(old_entryhi);
- mtc0_tlbw_hazard();
-
- local_irq_restore(flags);
-
- kvm_debug("Host TLB lookup, %#lx, idx: %2d\n", vaddr, idx);
-
- return idx;
-}
-EXPORT_SYMBOL_GPL(kvm_mips_host_tlb_lookup);
-
-int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va)
+static int _kvm_mips_host_tlb_inv(unsigned long entryhi)
{
int idx;
- unsigned long flags, old_entryhi;
-
- local_irq_save(flags);
-
- old_entryhi = read_c0_entryhi();
- write_c0_entryhi((va & VPN2_MASK) | kvm_mips_get_user_asid(vcpu));
+ write_c0_entryhi(entryhi);
mtc0_tlbw_hazard();
tlb_probe();
@@ -282,7 +131,7 @@ int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va)
if (idx >= current_cpu_data.tlbsize)
BUG();
- if (idx > 0) {
+ if (idx >= 0) {
write_c0_entryhi(UNIQUE_ENTRYHI(idx));
write_c0_entrylo0(0);
write_c0_entrylo1(0);
@@ -292,93 +141,75 @@ int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va)
tlbw_use_hazard();
}
- write_c0_entryhi(old_entryhi);
- mtc0_tlbw_hazard();
-
- local_irq_restore(flags);
-
- if (idx > 0)
- kvm_debug("%s: Invalidated entryhi %#lx @ idx %d\n", __func__,
- (va & VPN2_MASK) | kvm_mips_get_user_asid(vcpu), idx);
-
- return 0;
+ return idx;
}
-EXPORT_SYMBOL_GPL(kvm_mips_host_tlb_inv);
-void kvm_mips_flush_host_tlb(int skip_kseg0)
+int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va,
+ bool user, bool kernel)
{
- unsigned long flags;
- unsigned long old_entryhi, entryhi;
- unsigned long old_pagemask;
- int entry = 0;
- int maxentry = current_cpu_data.tlbsize;
+ int idx_user, idx_kernel;
+ unsigned long flags, old_entryhi;
local_irq_save(flags);
old_entryhi = read_c0_entryhi();
- old_pagemask = read_c0_pagemask();
-
- /* Blast 'em all away. */
- for (entry = 0; entry < maxentry; entry++) {
- write_c0_index(entry);
-
- if (skip_kseg0) {
- mtc0_tlbr_hazard();
- tlb_read();
- tlb_read_hazard();
-
- entryhi = read_c0_entryhi();
- /* Don't blow away guest kernel entries */
- if (KVM_GUEST_KSEGX(entryhi) == KVM_GUEST_KSEG0)
- continue;
-
- write_c0_pagemask(old_pagemask);
- }
-
- /* Make sure all entries differ. */
- write_c0_entryhi(UNIQUE_ENTRYHI(entry));
- write_c0_entrylo0(0);
- write_c0_entrylo1(0);
- mtc0_tlbw_hazard();
-
- tlb_write_indexed();
- tlbw_use_hazard();
- }
+ if (user)
+ idx_user = _kvm_mips_host_tlb_inv((va & VPN2_MASK) |
+ kvm_mips_get_user_asid(vcpu));
+ if (kernel)
+ idx_kernel = _kvm_mips_host_tlb_inv((va & VPN2_MASK) |
+ kvm_mips_get_kernel_asid(vcpu));
write_c0_entryhi(old_entryhi);
- write_c0_pagemask(old_pagemask);
mtc0_tlbw_hazard();
local_irq_restore(flags);
+
+ if (user && idx_user >= 0)
+ kvm_debug("%s: Invalidated guest user entryhi %#lx @ idx %d\n",
+ __func__, (va & VPN2_MASK) |
+ kvm_mips_get_user_asid(vcpu), idx_user);
+ if (kernel && idx_kernel >= 0)
+ kvm_debug("%s: Invalidated guest kernel entryhi %#lx @ idx %d\n",
+ __func__, (va & VPN2_MASK) |
+ kvm_mips_get_kernel_asid(vcpu), idx_kernel);
+
+ return 0;
}
-EXPORT_SYMBOL_GPL(kvm_mips_flush_host_tlb);
+EXPORT_SYMBOL_GPL(kvm_mips_host_tlb_inv);
-void kvm_local_flush_tlb_all(void)
+/**
+ * kvm_mips_suspend_mm() - Suspend the active mm.
+ * @cpu The CPU we're running on.
+ *
+ * Suspend the active_mm, ready for a switch to a KVM guest virtual address
+ * space. This is left active for the duration of guest context, including time
+ * with interrupts enabled, so we need to be careful not to confuse e.g. cache
+ * management IPIs.
+ *
+ * kvm_mips_resume_mm() should be called before context switching to a different
+ * process so we don't need to worry about reference counting.
+ *
+ * This needs to be in static kernel code to avoid exporting init_mm.
+ */
+void kvm_mips_suspend_mm(int cpu)
{
- unsigned long flags;
- unsigned long old_ctx;
- int entry = 0;
-
- local_irq_save(flags);
- /* Save old context and create impossible VPN2 value */
- old_ctx = read_c0_entryhi();
- write_c0_entrylo0(0);
- write_c0_entrylo1(0);
-
- /* Blast 'em all away. */
- while (entry < current_cpu_data.tlbsize) {
- /* Make sure all entries differ. */
- write_c0_entryhi(UNIQUE_ENTRYHI(entry));
- write_c0_index(entry);
- mtc0_tlbw_hazard();
- tlb_write_indexed();
- tlbw_use_hazard();
- entry++;
- }
- write_c0_entryhi(old_ctx);
- mtc0_tlbw_hazard();
+ cpumask_clear_cpu(cpu, mm_cpumask(current->active_mm));
+ current->active_mm = &init_mm;
+}
+EXPORT_SYMBOL_GPL(kvm_mips_suspend_mm);
- local_irq_restore(flags);
+/**
+ * kvm_mips_resume_mm() - Resume the current process mm.
+ * @cpu The CPU we're running on.
+ *
+ * Resume the mm of the current process, after a switch back from a KVM guest
+ * virtual address space (see kvm_mips_suspend_mm()).
+ */
+void kvm_mips_resume_mm(int cpu)
+{
+ cpumask_set_cpu(cpu, mm_cpumask(current->mm));
+ current->active_mm = current->mm;
}
-EXPORT_SYMBOL_GPL(kvm_local_flush_tlb_all);
+EXPORT_SYMBOL_GPL(kvm_mips_resume_mm);