From: Marcelo Tosatti <mtosatti@redhat.com>
To: kvm@vger.kernel.org
Cc: avi@redhat.com, Marcelo Tosatti <mtosatti@redhat.com>
Subject: [patch 10/10] KVM: switch vcpu context to use SRCU
Date: Mon, 21 Sep 2009 20:37:21 -0300 [thread overview]
Message-ID: <20090921234124.924808866@amt.cnet> (raw)
In-Reply-To: 20090921233711.213665413@amt.cnet
[-- Attachment #1: switch-to-memslot-srcu --]
[-- Type: text/plain, Size: 7649 bytes --]
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Index: kvm-slotslock/arch/x86/kvm/x86.c
===================================================================
--- kvm-slotslock.orig/arch/x86/kvm/x86.c
+++ kvm-slotslock/arch/x86/kvm/x86.c
@@ -1140,15 +1140,15 @@ static int __msr_io(struct kvm_vcpu *vcp
int (*do_msr)(struct kvm_vcpu *vcpu,
unsigned index, u64 *data))
{
- int i;
+ int i, idx;
vcpu_load(vcpu);
- down_read(&vcpu->kvm->slots_lock);
+ idx = srcu_read_lock(&vcpu->kvm->srcu);
for (i = 0; i < msrs->nmsrs; ++i)
if (do_msr(vcpu, entries[i].index, &entries[i].data))
break;
- up_read(&vcpu->kvm->slots_lock);
+ srcu_read_unlock(&vcpu->kvm->srcu, idx);
vcpu_put(vcpu);
@@ -3531,16 +3531,17 @@ static void vapic_enter(struct kvm_vcpu
static void vapic_exit(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic = vcpu->arch.apic;
+ int idx;
if (!apic || !apic->vapic_addr)
return;
- down_read(&vcpu->kvm->slots_lock);
+ idx = srcu_read_lock(&vcpu->kvm->srcu);
kvm_release_page_dirty(apic->vapic_page);
spin_lock(&vcpu->kvm->mmu_lock);
mark_page_dirty(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
spin_unlock(&vcpu->kvm->mmu_lock);
- up_read(&vcpu->kvm->slots_lock);
+ srcu_read_unlock(&vcpu->kvm->srcu, idx);
}
static void update_cr8_intercept(struct kvm_vcpu *vcpu)
@@ -3669,7 +3670,7 @@ static int vcpu_enter_guest(struct kvm_v
kvm_lapic_sync_to_vapic(vcpu);
}
- up_read(&vcpu->kvm->slots_lock);
+ srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
kvm_guest_enter();
@@ -3710,7 +3711,7 @@ static int vcpu_enter_guest(struct kvm_v
preempt_enable();
- down_read(&vcpu->kvm->slots_lock);
+ vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
/*
* Profile KVM exit RIPs:
@@ -3732,6 +3733,7 @@ out:
static int __vcpu_run(struct kvm_vcpu *vcpu)
{
int r;
+ struct kvm *kvm = vcpu->kvm;
if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED)) {
pr_debug("vcpu %d received sipi with vector # %x\n",
@@ -3743,7 +3745,7 @@ static int __vcpu_run(struct kvm_vcpu *v
vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
}
- down_read(&vcpu->kvm->slots_lock);
+ vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
vapic_enter(vcpu);
r = 1;
@@ -3751,9 +3753,9 @@ static int __vcpu_run(struct kvm_vcpu *v
if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE)
r = vcpu_enter_guest(vcpu);
else {
- up_read(&vcpu->kvm->slots_lock);
+ srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
kvm_vcpu_block(vcpu);
- down_read(&vcpu->kvm->slots_lock);
+ vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
if (test_and_clear_bit(KVM_REQ_UNHALT, &vcpu->requests))
{
switch(vcpu->arch.mp_state) {
@@ -3788,13 +3790,13 @@ static int __vcpu_run(struct kvm_vcpu *v
++vcpu->stat.signal_exits;
}
if (need_resched()) {
- up_read(&vcpu->kvm->slots_lock);
+ srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
kvm_resched(vcpu);
- down_read(&vcpu->kvm->slots_lock);
+ vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
}
}
- up_read(&vcpu->kvm->slots_lock);
+ srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
post_kvm_run_save(vcpu);
vapic_exit(vcpu);
@@ -3834,10 +3836,10 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_v
vcpu->mmio_read_completed = 1;
vcpu->mmio_needed = 0;
- down_read(&vcpu->kvm->slots_lock);
+ vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
r = emulate_instruction(vcpu, vcpu->arch.mmio_fault_cr2, 0,
EMULTYPE_NO_DECODE);
- up_read(&vcpu->kvm->slots_lock);
+ srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
if (r == EMULATE_DO_MMIO) {
/*
* Read-modify-write. Back to userspace.
@@ -4575,11 +4577,12 @@ int kvm_arch_vcpu_ioctl_translate(struct
{
unsigned long vaddr = tr->linear_address;
gpa_t gpa;
+ int idx;
vcpu_load(vcpu);
- down_read(&vcpu->kvm->slots_lock);
+ idx = srcu_read_lock(&vcpu->kvm->srcu);
gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, vaddr);
- up_read(&vcpu->kvm->slots_lock);
+ srcu_read_unlock(&vcpu->kvm->srcu, idx);
tr->physical_address = gpa;
tr->valid = gpa != UNMAPPED_GVA;
tr->writeable = 1;
@@ -4818,10 +4821,12 @@ fail:
void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
{
+ int idx;
+
kvm_free_lapic(vcpu);
- down_read(&vcpu->kvm->slots_lock);
+ idx = srcu_read_lock(&vcpu->kvm->srcu);
kvm_mmu_destroy(vcpu);
- up_read(&vcpu->kvm->slots_lock);
+ srcu_read_unlock(&vcpu->kvm->srcu, idx);
free_page((unsigned long)vcpu->arch.pio_data);
}
Index: kvm-slotslock/include/linux/kvm_host.h
===================================================================
--- kvm-slotslock.orig/include/linux/kvm_host.h
+++ kvm-slotslock/include/linux/kvm_host.h
@@ -84,6 +84,8 @@ struct kvm_vcpu {
struct kvm_run *run;
unsigned long requests;
unsigned long guest_debug;
+ int srcu_idx;
+
int fpu_active;
int guest_fpu_loaded;
wait_queue_head_t wq;
Index: kvm-slotslock/arch/x86/kvm/mmu.c
===================================================================
--- kvm-slotslock.orig/arch/x86/kvm/mmu.c
+++ kvm-slotslock/arch/x86/kvm/mmu.c
@@ -2883,10 +2883,9 @@ static int mmu_shrink(int nr_to_scan, gf
spin_lock(&kvm_lock);
list_for_each_entry(kvm, &vm_list, vm_list) {
- int npages;
+ int npages, idx;
- if (!down_read_trylock(&kvm->slots_lock))
- continue;
+ idx = srcu_read_lock(&kvm->srcu);
spin_lock(&kvm->mmu_lock);
npages = kvm->arch.n_alloc_mmu_pages -
kvm->arch.n_free_mmu_pages;
@@ -2899,7 +2898,7 @@ static int mmu_shrink(int nr_to_scan, gf
nr_to_scan--;
spin_unlock(&kvm->mmu_lock);
- up_read(&kvm->slots_lock);
+ srcu_read_unlock(&kvm->srcu, idx);
}
if (kvm_freed)
list_move_tail(&kvm_freed->vm_list, &vm_list);
Index: kvm-slotslock/arch/x86/kvm/vmx.c
===================================================================
--- kvm-slotslock.orig/arch/x86/kvm/vmx.c
+++ kvm-slotslock/arch/x86/kvm/vmx.c
@@ -2429,10 +2429,10 @@ static int vmx_vcpu_reset(struct kvm_vcp
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
u64 msr;
- int ret;
+ int ret, idx;
vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP));
- down_read(&vcpu->kvm->slots_lock);
+ idx = srcu_read_lock(&vcpu->kvm->srcu);
if (!init_rmode(vmx->vcpu.kvm)) {
ret = -ENOMEM;
goto out;
@@ -2540,7 +2540,7 @@ static int vmx_vcpu_reset(struct kvm_vcp
vmx->emulation_required = 0;
out:
- up_read(&vcpu->kvm->slots_lock);
+ srcu_read_unlock(&vcpu->kvm->srcu, idx);
return ret;
}
Index: kvm-slotslock/arch/ia64/kvm/kvm-ia64.c
===================================================================
--- kvm-slotslock.orig/arch/ia64/kvm/kvm-ia64.c
+++ kvm-slotslock/arch/ia64/kvm/kvm-ia64.c
@@ -636,12 +636,9 @@ static void kvm_vcpu_post_transition(str
static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
union context *host_ctx, *guest_ctx;
- int r;
+ int r, idx;
- /*
- * down_read() may sleep and return with interrupts enabled
- */
- down_read(&vcpu->kvm->slots_lock);
+ idx = srcu_read_lock(&vcpu->kvm->srcu);
again:
if (signal_pending(current)) {
@@ -663,7 +660,7 @@ again:
if (r < 0)
goto vcpu_run_fail;
- up_read(&vcpu->kvm->slots_lock);
+ srcu_read_unlock(&vcpu->kvm->srcu, idx);
kvm_guest_enter();
/*
@@ -687,7 +684,7 @@ again:
kvm_guest_exit();
preempt_enable();
- down_read(&vcpu->kvm->slots_lock);
+ idx = srcu_read_lock(&vcpu->kvm->srcu);
r = kvm_handle_exit(kvm_run, vcpu);
@@ -697,10 +694,10 @@ again:
}
out:
- up_read(&vcpu->kvm->slots_lock);
+ srcu_read_unlock(&vcpu->kvm->srcu, idx);
if (r > 0) {
kvm_resched(vcpu);
- down_read(&vcpu->kvm->slots_lock);
+ idx = srcu_read_lock(&vcpu->kvm->srcu);
goto again;
}
next prev parent reply other threads:[~2009-09-21 23:42 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-21 23:37 [patch 00/10] RFC: switch vcpu context to use SRCU Marcelo Tosatti
2009-09-21 23:37 ` [patch 01/10] KVM: modify memslots layout in struct kvm Marcelo Tosatti
2009-09-21 23:37 ` [patch 02/10] KVM: modify alias layout in x86s struct kvm_arch Marcelo Tosatti
2009-09-21 23:37 ` [patch 03/10] KVM: switch dirty_log to mmu_lock protection Marcelo Tosatti
2009-09-22 6:37 ` Avi Kivity
2009-09-22 12:44 ` Marcelo Tosatti
2009-09-22 12:52 ` Avi Kivity
2009-09-21 23:37 ` [patch 04/10] KVM: split kvm_arch_set_memory_region into prepare and commit Marcelo Tosatti
2009-09-22 6:40 ` Avi Kivity
2009-09-21 23:37 ` [patch 05/10] KVM: introduce gfn_to_pfn_memslot Marcelo Tosatti
2009-09-21 23:37 ` [patch 06/10] KVM: use gfn_to_pfn_memslot in kvm_iommu_map_pages Marcelo Tosatti
2009-09-21 23:37 ` [patch 07/10] KVM: introduce kvm->srcu and convert kvm_set_memory_region to SRCU update Marcelo Tosatti
2009-09-22 6:59 ` Avi Kivity
2009-09-22 16:16 ` Marcelo Tosatti
2009-09-22 10:40 ` Fernando Carrijo
2009-09-22 12:55 ` Marcelo Tosatti
2009-09-24 14:06 ` Marcelo Tosatti
2009-09-24 17:28 ` Paul E. McKenney
2009-09-24 18:05 ` Marcelo Tosatti
2009-09-25 15:05 ` Avi Kivity
2009-09-21 23:37 ` [patch 08/10] KVM: x86: switch kvm_set_memory_alias " Marcelo Tosatti
2009-09-22 7:04 ` Avi Kivity
2009-09-21 23:37 ` [patch 09/10] KVM: convert io_bus to SRCU Marcelo Tosatti
2009-09-21 23:37 ` Marcelo Tosatti [this message]
2009-09-22 7:07 ` [patch 10/10] KVM: switch vcpu context to use SRCU Avi Kivity
2009-09-22 7:09 ` [patch 00/10] RFC: " Avi Kivity
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