--- /dev/null
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * KVM/MIPS MMU handling in the KVM module.
+ *
+ * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
+ * Authors: Sanjay Lal <sanjayl@kymasys.com>
+ */
+
+#include <linux/kvm_host.h>
+#include <asm/mmu_context.h>
+
+static u32 kvm_mips_get_kernel_asid(struct kvm_vcpu *vcpu)
+{
+ int cpu = smp_processor_id();
+
+ return vcpu->arch.guest_kernel_asid[cpu] &
+ cpu_asid_mask(&cpu_data[cpu]);
+}
+
+static u32 kvm_mips_get_user_asid(struct kvm_vcpu *vcpu)
+{
+ int cpu = smp_processor_id();
+
+ return vcpu->arch.guest_user_asid[cpu] &
+ cpu_asid_mask(&cpu_data[cpu]);
+}
+
+static int kvm_mips_map_page(struct kvm *kvm, gfn_t gfn)
+{
+ int srcu_idx, err = 0;
+ kvm_pfn_t pfn;
+
+ if (kvm->arch.guest_pmap[gfn] != KVM_INVALID_PAGE)
+ return 0;
+
+ srcu_idx = srcu_read_lock(&kvm->srcu);
+ pfn = kvm_mips_gfn_to_pfn(kvm, gfn);
+
+ if (kvm_mips_is_error_pfn(pfn)) {
+ kvm_err("Couldn't get pfn for gfn %#llx!\n", gfn);
+ err = -EFAULT;
+ goto out;
+ }
+
+ kvm->arch.guest_pmap[gfn] = pfn;
+out:
+ srcu_read_unlock(&kvm->srcu, srcu_idx);
+ return err;
+}
+
+/* Translate guest KSEG0 addresses to Host PA */
+unsigned long kvm_mips_translate_guest_kseg0_to_hpa(struct kvm_vcpu *vcpu,
+ unsigned long gva)
+{
+ gfn_t gfn;
+ unsigned long offset = gva & ~PAGE_MASK;
+ struct kvm *kvm = vcpu->kvm;
+
+ if (KVM_GUEST_KSEGX(gva) != KVM_GUEST_KSEG0) {
+ kvm_err("%s/%p: Invalid gva: %#lx\n", __func__,
+ __builtin_return_address(0), gva);
+ return KVM_INVALID_PAGE;
+ }
+
+ gfn = (KVM_GUEST_CPHYSADDR(gva) >> PAGE_SHIFT);
+
+ if (gfn >= kvm->arch.guest_pmap_npages) {
+ kvm_err("%s: Invalid gfn: %#llx, GVA: %#lx\n", __func__, gfn,
+ gva);
+ return KVM_INVALID_PAGE;
+ }
+
+ if (kvm_mips_map_page(vcpu->kvm, gfn) < 0)
+ return KVM_INVALID_ADDR;
+
+ return (kvm->arch.guest_pmap[gfn] << PAGE_SHIFT) + offset;
+}
+
+/* XXXKYMA: Must be called with interrupts disabled */
+int kvm_mips_handle_kseg0_tlb_fault(unsigned long badvaddr,
+ struct kvm_vcpu *vcpu)
+{
+ gfn_t gfn;
+ kvm_pfn_t pfn0, pfn1;
+ unsigned long vaddr = 0;
+ unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0;
+ int even;
+ struct kvm *kvm = vcpu->kvm;
+ const int flush_dcache_mask = 0;
+ int ret;
+
+ if (KVM_GUEST_KSEGX(badvaddr) != KVM_GUEST_KSEG0) {
+ kvm_err("%s: Invalid BadVaddr: %#lx\n", __func__, badvaddr);
+ kvm_mips_dump_host_tlbs();
+ return -1;
+ }
+
+ gfn = (KVM_GUEST_CPHYSADDR(badvaddr) >> PAGE_SHIFT);
+ if (gfn >= kvm->arch.guest_pmap_npages) {
+ kvm_err("%s: Invalid gfn: %#llx, BadVaddr: %#lx\n", __func__,
+ gfn, badvaddr);
+ kvm_mips_dump_host_tlbs();
+ return -1;
+ }
+ even = !(gfn & 0x1);
+ vaddr = badvaddr & (PAGE_MASK << 1);
+
+ if (kvm_mips_map_page(vcpu->kvm, gfn) < 0)
+ return -1;
+
+ if (kvm_mips_map_page(vcpu->kvm, gfn ^ 0x1) < 0)
+ return -1;
+
+ if (even) {
+ pfn0 = kvm->arch.guest_pmap[gfn];
+ pfn1 = kvm->arch.guest_pmap[gfn ^ 0x1];
+ } else {
+ pfn0 = kvm->arch.guest_pmap[gfn ^ 0x1];
+ pfn1 = kvm->arch.guest_pmap[gfn];
+ }
+
+ entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) |
+ (1 << 2) | (0x1 << 1);
+ entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) |
+ (1 << 2) | (0x1 << 1);
+
+ preempt_disable();
+ entryhi = (vaddr | kvm_mips_get_kernel_asid(vcpu));
+ ret = kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1,
+ flush_dcache_mask);
+ preempt_enable();
+
+ return ret;
+}
+
+int kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu,
+ struct kvm_mips_tlb *tlb,
+ unsigned long *hpa0,
+ unsigned long *hpa1)
+{
+ unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0;
+ struct kvm *kvm = vcpu->kvm;
+ kvm_pfn_t pfn0, pfn1;
+ int ret;
+
+ if ((tlb->tlb_hi & VPN2_MASK) == 0) {
+ pfn0 = 0;
+ pfn1 = 0;
+ } else {
+ if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo0)
+ >> PAGE_SHIFT) < 0)
+ return -1;
+
+ if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo1)
+ >> PAGE_SHIFT) < 0)
+ return -1;
+
+ pfn0 = kvm->arch.guest_pmap[mips3_tlbpfn_to_paddr(tlb->tlb_lo0)
+ >> PAGE_SHIFT];
+ pfn1 = kvm->arch.guest_pmap[mips3_tlbpfn_to_paddr(tlb->tlb_lo1)
+ >> PAGE_SHIFT];
+ }
+
+ if (hpa0)
+ *hpa0 = pfn0 << PAGE_SHIFT;
+
+ if (hpa1)
+ *hpa1 = pfn1 << PAGE_SHIFT;
+
+ /* Get attributes from the Guest TLB */
+ entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) |
+ (tlb->tlb_lo0 & MIPS3_PG_D) | (tlb->tlb_lo0 & MIPS3_PG_V);
+ entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) |
+ (tlb->tlb_lo1 & MIPS3_PG_D) | (tlb->tlb_lo1 & MIPS3_PG_V);
+
+ kvm_debug("@ %#lx tlb_lo0: 0x%08lx tlb_lo1: 0x%08lx\n", vcpu->arch.pc,
+ tlb->tlb_lo0, tlb->tlb_lo1);
+
+ preempt_disable();
+ entryhi = (tlb->tlb_hi & VPN2_MASK) | (KVM_GUEST_KERNEL_MODE(vcpu) ?
+ kvm_mips_get_kernel_asid(vcpu) :
+ kvm_mips_get_user_asid(vcpu));
+ ret = kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1,
+ tlb->tlb_mask);
+ preempt_enable();
+
+ return ret;
+}
+
+void kvm_get_new_mmu_context(struct mm_struct *mm, unsigned long cpu,
+ struct kvm_vcpu *vcpu)
+{
+ unsigned long asid = asid_cache(cpu);
+
+ asid += cpu_asid_inc();
+ if (!(asid & cpu_asid_mask(&cpu_data[cpu]))) {
+ if (cpu_has_vtag_icache)
+ flush_icache_all();
+
+ kvm_local_flush_tlb_all(); /* start new asid cycle */
+
+ if (!asid) /* fix version if needed */
+ asid = asid_first_version(cpu);
+ }
+
+ cpu_context(cpu, mm) = asid_cache(cpu) = asid;
+}
+
+/**
+ * kvm_mips_migrate_count() - Migrate timer.
+ * @vcpu: Virtual CPU.
+ *
+ * Migrate CP0_Count hrtimer to the current CPU by cancelling and restarting it
+ * if it was running prior to being cancelled.
+ *
+ * Must be called when the VCPU is migrated to a different CPU to ensure that
+ * timer expiry during guest execution interrupts the guest and causes the
+ * interrupt to be delivered in a timely manner.
+ */
+static void kvm_mips_migrate_count(struct kvm_vcpu *vcpu)
+{
+ if (hrtimer_cancel(&vcpu->arch.comparecount_timer))
+ hrtimer_restart(&vcpu->arch.comparecount_timer);
+}
+
+/* Restore ASID once we are scheduled back after preemption */
+void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
+{
+ unsigned long asid_mask = cpu_asid_mask(&cpu_data[cpu]);
+ unsigned long flags;
+ int newasid = 0;
+
+ kvm_debug("%s: vcpu %p, cpu: %d\n", __func__, vcpu, cpu);
+
+ /* Allocate new kernel and user ASIDs if needed */
+
+ local_irq_save(flags);
+
+ if ((vcpu->arch.guest_kernel_asid[cpu] ^ asid_cache(cpu)) &
+ asid_version_mask(cpu)) {
+ kvm_get_new_mmu_context(&vcpu->arch.guest_kernel_mm, cpu, vcpu);
+ vcpu->arch.guest_kernel_asid[cpu] =
+ vcpu->arch.guest_kernel_mm.context.asid[cpu];
+ kvm_get_new_mmu_context(&vcpu->arch.guest_user_mm, cpu, vcpu);
+ vcpu->arch.guest_user_asid[cpu] =
+ vcpu->arch.guest_user_mm.context.asid[cpu];
+ newasid++;
+
+ kvm_debug("[%d]: cpu_context: %#lx\n", cpu,
+ cpu_context(cpu, current->mm));
+ kvm_debug("[%d]: Allocated new ASID for Guest Kernel: %#x\n",
+ cpu, vcpu->arch.guest_kernel_asid[cpu]);
+ kvm_debug("[%d]: Allocated new ASID for Guest User: %#x\n", cpu,
+ vcpu->arch.guest_user_asid[cpu]);
+ }
+
+ if (vcpu->arch.last_sched_cpu != cpu) {
+ kvm_debug("[%d->%d]KVM VCPU[%d] switch\n",
+ vcpu->arch.last_sched_cpu, cpu, vcpu->vcpu_id);
+ /*
+ * Migrate the timer interrupt to the current CPU so that it
+ * always interrupts the guest and synchronously triggers a
+ * guest timer interrupt.
+ */
+ kvm_mips_migrate_count(vcpu);
+ }
+
+ if (!newasid) {
+ /*
+ * If we preempted while the guest was executing, then reload
+ * the pre-empted ASID
+ */
+ if (current->flags & PF_VCPU) {
+ write_c0_entryhi(vcpu->arch.
+ preempt_entryhi & asid_mask);
+ ehb();
+ }
+ } else {
+ /* New ASIDs were allocated for the VM */
+
+ /*
+ * Were we in guest context? If so then the pre-empted ASID is
+ * no longer valid, we need to set it to what it should be based
+ * on the mode of the Guest (Kernel/User)
+ */
+ if (current->flags & PF_VCPU) {
+ if (KVM_GUEST_KERNEL_MODE(vcpu))
+ write_c0_entryhi(vcpu->arch.
+ guest_kernel_asid[cpu] &
+ asid_mask);
+ else
+ write_c0_entryhi(vcpu->arch.
+ guest_user_asid[cpu] &
+ asid_mask);
+ ehb();
+ }
+ }
+
+ /* restore guest state to registers */
+ kvm_mips_callbacks->vcpu_set_regs(vcpu);
+
+ local_irq_restore(flags);
+
+}
+
+/* ASID can change if another task is scheduled during preemption */
+void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
+{
+ unsigned long flags;
+ int cpu;
+
+ local_irq_save(flags);
+
+ cpu = smp_processor_id();
+
+ vcpu->arch.preempt_entryhi = read_c0_entryhi();
+ vcpu->arch.last_sched_cpu = cpu;
+
+ /* save guest state in registers */
+ kvm_mips_callbacks->vcpu_get_regs(vcpu);
+
+ if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) &
+ asid_version_mask(cpu))) {
+ kvm_debug("%s: Dropping MMU Context: %#lx\n", __func__,
+ cpu_context(cpu, current->mm));
+ drop_mmu_context(current->mm, cpu);
+ }
+ write_c0_entryhi(cpu_asid(cpu, current->mm));
+ ehb();
+
+ local_irq_restore(flags);
+}
+
+u32 kvm_get_inst(u32 *opc, struct kvm_vcpu *vcpu)
+{
+ struct mips_coproc *cop0 = vcpu->arch.cop0;
+ unsigned long paddr, flags, vpn2, asid;
+ u32 inst;
+ int index;
+
+ if (KVM_GUEST_KSEGX((unsigned long) opc) < KVM_GUEST_KSEG0 ||
+ KVM_GUEST_KSEGX((unsigned long) opc) == KVM_GUEST_KSEG23) {
+ local_irq_save(flags);
+ index = kvm_mips_host_tlb_lookup(vcpu, (unsigned long) opc);
+ if (index >= 0) {
+ inst = *(opc);
+ } else {
+ vpn2 = (unsigned long) opc & VPN2_MASK;
+ asid = kvm_read_c0_guest_entryhi(cop0) &
+ KVM_ENTRYHI_ASID;
+ index = kvm_mips_guest_tlb_lookup(vcpu, vpn2 | asid);
+ if (index < 0) {
+ kvm_err("%s: get_user_failed for %p, vcpu: %p, ASID: %#lx\n",
+ __func__, opc, vcpu, read_c0_entryhi());
+ kvm_mips_dump_host_tlbs();
+ local_irq_restore(flags);
+ return KVM_INVALID_INST;
+ }
+ kvm_mips_handle_mapped_seg_tlb_fault(vcpu,
+ &vcpu->arch.
+ guest_tlb[index],
+ NULL, NULL);
+ inst = *(opc);
+ }
+ local_irq_restore(flags);
+ } else if (KVM_GUEST_KSEGX(opc) == KVM_GUEST_KSEG0) {
+ paddr =
+ kvm_mips_translate_guest_kseg0_to_hpa(vcpu,
+ (unsigned long) opc);
+ inst = *(u32 *) CKSEG0ADDR(paddr);
+ } else {
+ kvm_err("%s: illegal address: %p\n", __func__, opc);
+ return KVM_INVALID_INST;
+ }
+
+ return inst;
+}
#include <linux/smp.h>
#include <linux/mm.h>
#include <linux/delay.h>
-#include <linux/module.h>
+#include <linux/export.h>
#include <linux/kvm_host.h>
#include <linux/srcu.h>
bool (*kvm_mips_is_error_pfn)(kvm_pfn_t pfn);
EXPORT_SYMBOL_GPL(kvm_mips_is_error_pfn);
-u32 kvm_mips_get_kernel_asid(struct kvm_vcpu *vcpu)
+static u32 kvm_mips_get_kernel_asid(struct kvm_vcpu *vcpu)
{
int cpu = smp_processor_id();
cpu_asid_mask(&cpu_data[cpu]);
}
-u32 kvm_mips_get_user_asid(struct kvm_vcpu *vcpu)
+static u32 kvm_mips_get_user_asid(struct kvm_vcpu *vcpu)
{
int cpu = smp_processor_id();
}
EXPORT_SYMBOL_GPL(kvm_mips_dump_guest_tlbs);
-static int kvm_mips_map_page(struct kvm *kvm, gfn_t gfn)
-{
- int srcu_idx, err = 0;
- kvm_pfn_t pfn;
-
- if (kvm->arch.guest_pmap[gfn] != KVM_INVALID_PAGE)
- return 0;
-
- srcu_idx = srcu_read_lock(&kvm->srcu);
- pfn = kvm_mips_gfn_to_pfn(kvm, gfn);
-
- if (kvm_mips_is_error_pfn(pfn)) {
- kvm_err("Couldn't get pfn for gfn %#llx!\n", gfn);
- err = -EFAULT;
- goto out;
- }
-
- kvm->arch.guest_pmap[gfn] = pfn;
-out:
- srcu_read_unlock(&kvm->srcu, srcu_idx);
- return err;
-}
-
-/* Translate guest KSEG0 addresses to Host PA */
-unsigned long kvm_mips_translate_guest_kseg0_to_hpa(struct kvm_vcpu *vcpu,
- unsigned long gva)
-{
- gfn_t gfn;
- unsigned long offset = gva & ~PAGE_MASK;
- struct kvm *kvm = vcpu->kvm;
-
- if (KVM_GUEST_KSEGX(gva) != KVM_GUEST_KSEG0) {
- kvm_err("%s/%p: Invalid gva: %#lx\n", __func__,
- __builtin_return_address(0), gva);
- return KVM_INVALID_PAGE;
- }
-
- gfn = (KVM_GUEST_CPHYSADDR(gva) >> PAGE_SHIFT);
-
- if (gfn >= kvm->arch.guest_pmap_npages) {
- kvm_err("%s: Invalid gfn: %#llx, GVA: %#lx\n", __func__, gfn,
- gva);
- return KVM_INVALID_PAGE;
- }
-
- if (kvm_mips_map_page(vcpu->kvm, gfn) < 0)
- return KVM_INVALID_ADDR;
-
- return (kvm->arch.guest_pmap[gfn] << PAGE_SHIFT) + offset;
-}
-EXPORT_SYMBOL_GPL(kvm_mips_translate_guest_kseg0_to_hpa);
-
/* 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,
local_irq_restore(flags);
return 0;
}
-
-/* XXXKYMA: Must be called with interrupts disabled */
-int kvm_mips_handle_kseg0_tlb_fault(unsigned long badvaddr,
- struct kvm_vcpu *vcpu)
-{
- gfn_t gfn;
- kvm_pfn_t pfn0, pfn1;
- unsigned long vaddr = 0;
- unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0;
- int even;
- struct kvm *kvm = vcpu->kvm;
- const int flush_dcache_mask = 0;
- int ret;
-
- if (KVM_GUEST_KSEGX(badvaddr) != KVM_GUEST_KSEG0) {
- kvm_err("%s: Invalid BadVaddr: %#lx\n", __func__, badvaddr);
- kvm_mips_dump_host_tlbs();
- return -1;
- }
-
- gfn = (KVM_GUEST_CPHYSADDR(badvaddr) >> PAGE_SHIFT);
- if (gfn >= kvm->arch.guest_pmap_npages) {
- kvm_err("%s: Invalid gfn: %#llx, BadVaddr: %#lx\n", __func__,
- gfn, badvaddr);
- kvm_mips_dump_host_tlbs();
- return -1;
- }
- even = !(gfn & 0x1);
- vaddr = badvaddr & (PAGE_MASK << 1);
-
- if (kvm_mips_map_page(vcpu->kvm, gfn) < 0)
- return -1;
-
- if (kvm_mips_map_page(vcpu->kvm, gfn ^ 0x1) < 0)
- return -1;
-
- if (even) {
- pfn0 = kvm->arch.guest_pmap[gfn];
- pfn1 = kvm->arch.guest_pmap[gfn ^ 0x1];
- } else {
- pfn0 = kvm->arch.guest_pmap[gfn ^ 0x1];
- pfn1 = kvm->arch.guest_pmap[gfn];
- }
-
- entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) |
- (1 << 2) | (0x1 << 1);
- entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) |
- (1 << 2) | (0x1 << 1);
-
- preempt_disable();
- entryhi = (vaddr | kvm_mips_get_kernel_asid(vcpu));
- ret = kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1,
- flush_dcache_mask);
- preempt_enable();
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(kvm_mips_handle_kseg0_tlb_fault);
+EXPORT_SYMBOL_GPL(kvm_mips_host_tlb_write);
int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr,
struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_mips_handle_commpage_tlb_fault);
-int kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu,
- struct kvm_mips_tlb *tlb,
- unsigned long *hpa0,
- unsigned long *hpa1)
-{
- unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0;
- struct kvm *kvm = vcpu->kvm;
- kvm_pfn_t pfn0, pfn1;
- int ret;
-
- if ((tlb->tlb_hi & VPN2_MASK) == 0) {
- pfn0 = 0;
- pfn1 = 0;
- } else {
- if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo0)
- >> PAGE_SHIFT) < 0)
- return -1;
-
- if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo1)
- >> PAGE_SHIFT) < 0)
- return -1;
-
- pfn0 = kvm->arch.guest_pmap[mips3_tlbpfn_to_paddr(tlb->tlb_lo0)
- >> PAGE_SHIFT];
- pfn1 = kvm->arch.guest_pmap[mips3_tlbpfn_to_paddr(tlb->tlb_lo1)
- >> PAGE_SHIFT];
- }
-
- if (hpa0)
- *hpa0 = pfn0 << PAGE_SHIFT;
-
- if (hpa1)
- *hpa1 = pfn1 << PAGE_SHIFT;
-
- /* Get attributes from the Guest TLB */
- entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) |
- (tlb->tlb_lo0 & MIPS3_PG_D) | (tlb->tlb_lo0 & MIPS3_PG_V);
- entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) |
- (tlb->tlb_lo1 & MIPS3_PG_D) | (tlb->tlb_lo1 & MIPS3_PG_V);
-
- kvm_debug("@ %#lx tlb_lo0: 0x%08lx tlb_lo1: 0x%08lx\n", vcpu->arch.pc,
- tlb->tlb_lo0, tlb->tlb_lo1);
-
- preempt_disable();
- entryhi = (tlb->tlb_hi & VPN2_MASK) | (KVM_GUEST_KERNEL_MODE(vcpu) ?
- kvm_mips_get_kernel_asid(vcpu) :
- kvm_mips_get_user_asid(vcpu));
- ret = kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1,
- tlb->tlb_mask);
- preempt_enable();
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(kvm_mips_handle_mapped_seg_tlb_fault);
-
int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long entryhi)
{
int i;
}
EXPORT_SYMBOL_GPL(kvm_mips_flush_host_tlb);
-void kvm_get_new_mmu_context(struct mm_struct *mm, unsigned long cpu,
- struct kvm_vcpu *vcpu)
-{
- unsigned long asid = asid_cache(cpu);
-
- asid += cpu_asid_inc();
- if (!(asid & cpu_asid_mask(&cpu_data[cpu]))) {
- if (cpu_has_vtag_icache)
- flush_icache_all();
-
- kvm_local_flush_tlb_all(); /* start new asid cycle */
-
- if (!asid) /* fix version if needed */
- asid = asid_first_version(cpu);
- }
-
- cpu_context(cpu, mm) = asid_cache(cpu) = asid;
-}
-
void kvm_local_flush_tlb_all(void)
{
unsigned long flags;
local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(kvm_local_flush_tlb_all);
-
-/**
- * kvm_mips_migrate_count() - Migrate timer.
- * @vcpu: Virtual CPU.
- *
- * Migrate CP0_Count hrtimer to the current CPU by cancelling and restarting it
- * if it was running prior to being cancelled.
- *
- * Must be called when the VCPU is migrated to a different CPU to ensure that
- * timer expiry during guest execution interrupts the guest and causes the
- * interrupt to be delivered in a timely manner.
- */
-static void kvm_mips_migrate_count(struct kvm_vcpu *vcpu)
-{
- if (hrtimer_cancel(&vcpu->arch.comparecount_timer))
- hrtimer_restart(&vcpu->arch.comparecount_timer);
-}
-
-/* Restore ASID once we are scheduled back after preemption */
-void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
-{
- unsigned long asid_mask = cpu_asid_mask(&cpu_data[cpu]);
- unsigned long flags;
- int newasid = 0;
-
- kvm_debug("%s: vcpu %p, cpu: %d\n", __func__, vcpu, cpu);
-
- /* Allocate new kernel and user ASIDs if needed */
-
- local_irq_save(flags);
-
- if ((vcpu->arch.guest_kernel_asid[cpu] ^ asid_cache(cpu)) &
- asid_version_mask(cpu)) {
- kvm_get_new_mmu_context(&vcpu->arch.guest_kernel_mm, cpu, vcpu);
- vcpu->arch.guest_kernel_asid[cpu] =
- vcpu->arch.guest_kernel_mm.context.asid[cpu];
- kvm_get_new_mmu_context(&vcpu->arch.guest_user_mm, cpu, vcpu);
- vcpu->arch.guest_user_asid[cpu] =
- vcpu->arch.guest_user_mm.context.asid[cpu];
- newasid++;
-
- kvm_debug("[%d]: cpu_context: %#lx\n", cpu,
- cpu_context(cpu, current->mm));
- kvm_debug("[%d]: Allocated new ASID for Guest Kernel: %#x\n",
- cpu, vcpu->arch.guest_kernel_asid[cpu]);
- kvm_debug("[%d]: Allocated new ASID for Guest User: %#x\n", cpu,
- vcpu->arch.guest_user_asid[cpu]);
- }
-
- if (vcpu->arch.last_sched_cpu != cpu) {
- kvm_debug("[%d->%d]KVM VCPU[%d] switch\n",
- vcpu->arch.last_sched_cpu, cpu, vcpu->vcpu_id);
- /*
- * Migrate the timer interrupt to the current CPU so that it
- * always interrupts the guest and synchronously triggers a
- * guest timer interrupt.
- */
- kvm_mips_migrate_count(vcpu);
- }
-
- if (!newasid) {
- /*
- * If we preempted while the guest was executing, then reload
- * the pre-empted ASID
- */
- if (current->flags & PF_VCPU) {
- write_c0_entryhi(vcpu->arch.
- preempt_entryhi & asid_mask);
- ehb();
- }
- } else {
- /* New ASIDs were allocated for the VM */
-
- /*
- * Were we in guest context? If so then the pre-empted ASID is
- * no longer valid, we need to set it to what it should be based
- * on the mode of the Guest (Kernel/User)
- */
- if (current->flags & PF_VCPU) {
- if (KVM_GUEST_KERNEL_MODE(vcpu))
- write_c0_entryhi(vcpu->arch.
- guest_kernel_asid[cpu] &
- asid_mask);
- else
- write_c0_entryhi(vcpu->arch.
- guest_user_asid[cpu] &
- asid_mask);
- ehb();
- }
- }
-
- /* restore guest state to registers */
- kvm_mips_callbacks->vcpu_set_regs(vcpu);
-
- local_irq_restore(flags);
-
-}
-EXPORT_SYMBOL_GPL(kvm_arch_vcpu_load);
-
-/* ASID can change if another task is scheduled during preemption */
-void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
-{
- unsigned long flags;
- int cpu;
-
- local_irq_save(flags);
-
- cpu = smp_processor_id();
-
- vcpu->arch.preempt_entryhi = read_c0_entryhi();
- vcpu->arch.last_sched_cpu = cpu;
-
- /* save guest state in registers */
- kvm_mips_callbacks->vcpu_get_regs(vcpu);
-
- if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) &
- asid_version_mask(cpu))) {
- kvm_debug("%s: Dropping MMU Context: %#lx\n", __func__,
- cpu_context(cpu, current->mm));
- drop_mmu_context(current->mm, cpu);
- }
- write_c0_entryhi(cpu_asid(cpu, current->mm));
- ehb();
-
- local_irq_restore(flags);
-}
-EXPORT_SYMBOL_GPL(kvm_arch_vcpu_put);
-
-u32 kvm_get_inst(u32 *opc, struct kvm_vcpu *vcpu)
-{
- struct mips_coproc *cop0 = vcpu->arch.cop0;
- unsigned long paddr, flags, vpn2, asid;
- u32 inst;
- int index;
-
- if (KVM_GUEST_KSEGX((unsigned long) opc) < KVM_GUEST_KSEG0 ||
- KVM_GUEST_KSEGX((unsigned long) opc) == KVM_GUEST_KSEG23) {
- local_irq_save(flags);
- index = kvm_mips_host_tlb_lookup(vcpu, (unsigned long) opc);
- if (index >= 0) {
- inst = *(opc);
- } else {
- vpn2 = (unsigned long) opc & VPN2_MASK;
- asid = kvm_read_c0_guest_entryhi(cop0) &
- KVM_ENTRYHI_ASID;
- index = kvm_mips_guest_tlb_lookup(vcpu, vpn2 | asid);
- if (index < 0) {
- kvm_err("%s: get_user_failed for %p, vcpu: %p, ASID: %#lx\n",
- __func__, opc, vcpu, read_c0_entryhi());
- kvm_mips_dump_host_tlbs();
- local_irq_restore(flags);
- return KVM_INVALID_INST;
- }
- kvm_mips_handle_mapped_seg_tlb_fault(vcpu,
- &vcpu->arch.
- guest_tlb[index],
- NULL, NULL);
- inst = *(opc);
- }
- local_irq_restore(flags);
- } else if (KVM_GUEST_KSEGX(opc) == KVM_GUEST_KSEG0) {
- paddr =
- kvm_mips_translate_guest_kseg0_to_hpa(vcpu,
- (unsigned long) opc);
- inst = *(u32 *) CKSEG0ADDR(paddr);
- } else {
- kvm_err("%s: illegal address: %p\n", __func__, opc);
- return KVM_INVALID_INST;
- }
-
- return inst;
-}
-EXPORT_SYMBOL_GPL(kvm_get_inst);
projects / deliverable / linux.git / commitdiff
