static void kvm_deferred_mmu_op(void *buffer, int len)
{
struct kvm_para_state *state = kvm_para_state();
if (paravirt_get_lazy_mode() != PARAVIRT_LAZY_MMU) {
kvm_mmu_op(buffer, len);
return;
}
if (state->mmu_queue_len + len > sizeof state->mmu_queue)
mmu_queue_flush(state);
memcpy(state->mmu_queue + state->mmu_queue_len, buffer, len);
state->mmu_queue_len += len;
}
static void kvm_flush_tlb(void)
{
struct kvm_mmu_op_flush_tlb ftlb = {
.header.op = KVM_MMU_OP_FLUSH_TLB,
};
kvm_deferred_mmu_op(&ftlb, sizeof ftlb);
}
static void kvm_release_pt(unsigned long pfn)
{
struct kvm_mmu_op_release_pt rpt = {
.header.op = KVM_MMU_OP_RELEASE_PT,
.pt_phys = (u64)pfn << PAGE_SHIFT,
};
kvm_mmu_op(&rpt, sizeof rpt);
}
static void kvm_enter_lazy_mmu(void)
{
paravirt_enter_lazy_mmu();
}
static void kvm_leave_lazy_mmu(void)
{
struct kvm_para_state *state = kvm_para_state();
mmu_queue_flush(state);
paravirt_leave_lazy_mmu();
}
static void __init paravirt_ops_setup(void)
{
pv_info.name = "KVM";
pv_info.paravirt_enabled = 1;
if (kvm_para_has_feature(KVM_FEATURE_NOP_IO_DELAY))
pv_cpu_ops.io_delay = kvm_io_delay;
if (kvm_para_has_feature(KVM_FEATURE_MMU_OP)) {
pv_mmu_ops.set_pte = kvm_set_pte;
pv_mmu_ops.set_pte_at = kvm_set_pte_at;
pv_mmu_ops.set_pmd = kvm_set_pmd;
#if PAGETABLE_LEVELS >= 3
#ifdef CONFIG_X86_PAE
pv_mmu_ops.set_pte_atomic = kvm_set_pte_atomic;
pv_mmu_ops.pte_clear = kvm_pte_clear;
pv_mmu_ops.pmd_clear = kvm_pmd_clear;
#endif
pv_mmu_ops.set_pud = kvm_set_pud;
#if PAGETABLE_LEVELS == 4
pv_mmu_ops.set_pgd = kvm_set_pgd;
#endif
#endif
pv_mmu_ops.flush_tlb_user = kvm_flush_tlb;
pv_mmu_ops.release_pte = kvm_release_pt;
pv_mmu_ops.release_pmd = kvm_release_pt;
pv_mmu_ops.release_pud = kvm_release_pt;
pv_mmu_ops.lazy_mode.enter = kvm_enter_lazy_mmu;
pv_mmu_ops.lazy_mode.leave = kvm_leave_lazy_mmu;
}
#ifdef CONFIG_X86_IO_APIC
no_timer_check = 1;
#endif
}
void __init kvm_guest_init(void)
{
if (!kvm_para_available())
return;
paravirt_ops_setup();
}
static void kvm_flush_tlb(void)
{
struct kvm_mmu_op_flush_tlb ftlb = {
.header.op = KVM_MMU_OP_FLUSH_TLB,
};
kvm_deferred_mmu_op(&ftlb, sizeof ftlb);
}
static void kvm_release_pt(unsigned long pfn)
{
struct kvm_mmu_op_release_pt rpt = {
.header.op = KVM_MMU_OP_RELEASE_PT,
.pt_phys = (u64)pfn << PAGE_SHIFT,
};
kvm_mmu_op(&rpt, sizeof rpt);
}
static void kvm_enter_lazy_mmu(void)
{
paravirt_enter_lazy_mmu();
}
static void kvm_leave_lazy_mmu(void)
{
struct kvm_para_state *state = kvm_para_state();
mmu_queue_flush(state);
paravirt_leave_lazy_mmu();
}
static DEFINE_PER_CPU(unsigned long, kvm_apic_eoi) = KVM_PV_EOI_DISABLED;
static void kvm_guest_apic_eoi_write(u32 reg, u32 val)
{
/**
* This relies on __test_and_clear_bit to modify the memory
* in a way that is atomic with respect to the local CPU.
* The hypervisor only accesses this memory from the local CPU so
* there's no need for lock or memory barriers.
* An optimization barrier is implied in apic write.
*/
if (__test_and_clear_bit(KVM_PV_EOI_BIT, &__get_cpu_var(kvm_apic_eoi)))
return;
apic_write(APIC_EOI, APIC_EOI_ACK);
}
static void __init paravirt_ops_setup(void)
{
pv_info.name = "KVM";
pv_info.paravirt_enabled = 1;
if (kvm_para_has_feature(KVM_FEATURE_NOP_IO_DELAY))
pv_cpu_ops.io_delay = kvm_io_delay;
if (kvm_para_has_feature(KVM_FEATURE_MMU_OP)) {
pv_mmu_ops.set_pte = kvm_set_pte;
pv_mmu_ops.set_pte_at = kvm_set_pte_at;
pv_mmu_ops.set_pmd = kvm_set_pmd;
#if PAGETABLE_LEVELS >= 3
#ifdef CONFIG_X86_PAE
pv_mmu_ops.set_pte_atomic = kvm_set_pte_atomic;
pv_mmu_ops.pte_clear = kvm_pte_clear;
pv_mmu_ops.pmd_clear = kvm_pmd_clear;
#endif
pv_mmu_ops.set_pud = kvm_set_pud;
#if PAGETABLE_LEVELS == 4
pv_mmu_ops.set_pgd = kvm_set_pgd;
#endif
#endif
pv_mmu_ops.flush_tlb_user = kvm_flush_tlb;
pv_mmu_ops.release_pte = kvm_release_pt;
pv_mmu_ops.release_pmd = kvm_release_pt;
pv_mmu_ops.release_pud = kvm_release_pt;
pv_mmu_ops.lazy_mode.enter = kvm_enter_lazy_mmu;
pv_mmu_ops.lazy_mode.leave = kvm_leave_lazy_mmu;
}
#ifdef CONFIG_X86_IO_APIC
no_timer_check = 1;
#endif
}
static void kvm_register_steal_time(void)
{
int cpu = smp_processor_id();
struct kvm_steal_time *st = &per_cpu(steal_time, cpu);
if (!has_steal_clock)
return;
memset(st, 0, sizeof(*st));
wrmsrl(MSR_KVM_STEAL_TIME, (__pa(st) | KVM_MSR_ENABLED));
printk(KERN_INFO "kvm-stealtime: cpu %d, msr %lx\n",
cpu, __pa(st));
}