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Subject[PATCH 26/40] KVM: modify memslots layout in struct kvm
Date
From: Marcelo Tosatti <mtosatti@redhat.com>

Have a pointer to an allocated region inside struct kvm.

[alex: fix ppc book 3s]

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---
arch/ia64/kvm/kvm-ia64.c | 10 ++++++----
arch/powerpc/kvm/book3s.c | 2 +-
arch/x86/kvm/mmu.c | 11 ++++++-----
arch/x86/kvm/vmx.c | 4 ++--
arch/x86/kvm/x86.c | 4 ++--
include/linux/kvm_host.h | 12 ++++++++----
virt/kvm/iommu.c | 18 ++++++++++++------
virt/kvm/kvm_main.c | 36 +++++++++++++++++++++++-------------
8 files changed, 60 insertions(+), 37 deletions(-)

diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
index 5fdeec5..1ca1dbf 100644
--- a/arch/ia64/kvm/kvm-ia64.c
+++ b/arch/ia64/kvm/kvm-ia64.c
@@ -1377,12 +1377,14 @@ static void free_kvm(struct kvm *kvm)

static void kvm_release_vm_pages(struct kvm *kvm)
{
+ struct kvm_memslots *slots;
struct kvm_memory_slot *memslot;
int i, j;
unsigned long base_gfn;

- for (i = 0; i < kvm->nmemslots; i++) {
- memslot = &kvm->memslots[i];
+ slots = kvm->memslots;
+ for (i = 0; i < slots->nmemslots; i++) {
+ memslot = &slots->memslots[i];
base_gfn = memslot->base_gfn;

for (j = 0; j < memslot->npages; j++) {
@@ -1802,7 +1804,7 @@ static int kvm_ia64_sync_dirty_log(struct kvm *kvm,
if (log->slot >= KVM_MEMORY_SLOTS)
goto out;

- memslot = &kvm->memslots[log->slot];
+ memslot = &kvm->memslots->memslots[log->slot];
r = -ENOENT;
if (!memslot->dirty_bitmap)
goto out;
@@ -1840,7 +1842,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
/* If nothing is dirty, don't bother messing with page tables. */
if (is_dirty) {
kvm_flush_remote_tlbs(kvm);
- memslot = &kvm->memslots[log->slot];
+ memslot = &kvm->memslots->memslots[log->slot];
n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
memset(memslot->dirty_bitmap, 0, n);
}
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 803505d..bb8873d 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -865,7 +865,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,

/* If nothing is dirty, don't bother messing with page tables. */
if (is_dirty) {
- memslot = &kvm->memslots[log->slot];
+ memslot = &kvm->memslots->memslots[log->slot];

ga = memslot->base_gfn << PAGE_SHIFT;
ga_end = ga + (memslot->npages << PAGE_SHIFT);
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 4f499d7..81f84d3 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -807,13 +807,14 @@ static int kvm_handle_hva(struct kvm *kvm, unsigned long hva,
{
int i, j;
int retval = 0;
+ struct kvm_memslots *slots = kvm->memslots;

/*
* If mmap_sem isn't taken, we can look the memslots with only
* the mmu_lock by skipping over the slots with userspace_addr == 0.
*/
- for (i = 0; i < kvm->nmemslots; i++) {
- struct kvm_memory_slot *memslot = &kvm->memslots[i];
+ for (i = 0; i < slots->nmemslots; i++) {
+ struct kvm_memory_slot *memslot = &slots->memslots[i];
unsigned long start = memslot->userspace_addr;
unsigned long end;

@@ -3021,8 +3022,8 @@ unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm)
unsigned int nr_mmu_pages;
unsigned int nr_pages = 0;

- for (i = 0; i < kvm->nmemslots; i++)
- nr_pages += kvm->memslots[i].npages;
+ for (i = 0; i < kvm->memslots->nmemslots; i++)
+ nr_pages += kvm->memslots->memslots[i].npages;

nr_mmu_pages = nr_pages * KVM_PERMILLE_MMU_PAGES / 1000;
nr_mmu_pages = max(nr_mmu_pages,
@@ -3295,7 +3296,7 @@ static int count_rmaps(struct kvm_vcpu *vcpu)
int i, j, k;

for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
- struct kvm_memory_slot *m = &vcpu->kvm->memslots[i];
+ struct kvm_memory_slot *m = &vcpu->kvm->memslots->memslots[i];
struct kvm_rmap_desc *d;

for (j = 0; j < m->npages; ++j) {
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 74a66f0..1869879 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1503,8 +1503,8 @@ static void enter_pmode(struct kvm_vcpu *vcpu)
static gva_t rmode_tss_base(struct kvm *kvm)
{
if (!kvm->arch.tss_addr) {
- gfn_t base_gfn = kvm->memslots[0].base_gfn +
- kvm->memslots[0].npages - 3;
+ gfn_t base_gfn = kvm->memslots->memslots[0].base_gfn +
+ kvm->memslots->memslots[0].npages - 3;
return base_gfn << PAGE_SHIFT;
}
return kvm->arch.tss_addr;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 1bdcf26..f8e2712 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2428,7 +2428,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
spin_lock(&kvm->mmu_lock);
kvm_mmu_slot_remove_write_access(kvm, log->slot);
spin_unlock(&kvm->mmu_lock);
- memslot = &kvm->memslots[log->slot];
+ memslot = &kvm->memslots->memslots[log->slot];
n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
memset(memslot->dirty_bitmap, 0, n);
}
@@ -5224,7 +5224,7 @@ int kvm_arch_set_memory_region(struct kvm *kvm,
int user_alloc)
{
int npages = mem->memory_size >> PAGE_SHIFT;
- struct kvm_memory_slot *memslot = &kvm->memslots[mem->slot];
+ struct kvm_memory_slot *memslot = &kvm->memslots->memslots[mem->slot];

/*To keep backward compatibility with older userspace,
*x86 needs to hanlde !user_alloc case.
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index bd5a616..782bfb1 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -150,14 +150,18 @@ struct kvm_irq_routing_table {};

#endif

+struct kvm_memslots {
+ int nmemslots;
+ struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS +
+ KVM_PRIVATE_MEM_SLOTS];
+};
+
struct kvm {
spinlock_t mmu_lock;
spinlock_t requests_lock;
struct rw_semaphore slots_lock;
struct mm_struct *mm; /* userspace tied to this vm */
- int nmemslots;
- struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS +
- KVM_PRIVATE_MEM_SLOTS];
+ struct kvm_memslots *memslots;
#ifdef CONFIG_KVM_APIC_ARCHITECTURE
u32 bsp_vcpu_id;
struct kvm_vcpu *bsp_vcpu;
@@ -482,7 +486,7 @@ static inline void kvm_guest_exit(void)

static inline int memslot_id(struct kvm *kvm, struct kvm_memory_slot *slot)
{
- return slot - kvm->memslots;
+ return slot - kvm->memslots->memslots;
}

static inline gpa_t gfn_to_gpa(gfn_t gfn)
diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c
index 1514758..bc697a6 100644
--- a/virt/kvm/iommu.c
+++ b/virt/kvm/iommu.c
@@ -76,10 +76,13 @@ unmap_pages:
static int kvm_iommu_map_memslots(struct kvm *kvm)
{
int i, r = 0;
+ struct kvm_memslots *slots;

- for (i = 0; i < kvm->nmemslots; i++) {
- r = kvm_iommu_map_pages(kvm, kvm->memslots[i].base_gfn,
- kvm->memslots[i].npages);
+ slots = kvm->memslots;
+
+ for (i = 0; i < slots->nmemslots; i++) {
+ r = kvm_iommu_map_pages(kvm, slots->memslots[i].base_gfn,
+ slots->memslots[i].npages);
if (r)
break;
}
@@ -210,10 +213,13 @@ static void kvm_iommu_put_pages(struct kvm *kvm,
static int kvm_iommu_unmap_memslots(struct kvm *kvm)
{
int i;
+ struct kvm_memslots *slots;
+
+ slots = kvm->memslots;

- for (i = 0; i < kvm->nmemslots; i++) {
- kvm_iommu_put_pages(kvm, kvm->memslots[i].base_gfn,
- kvm->memslots[i].npages);
+ for (i = 0; i < slots->nmemslots; i++) {
+ kvm_iommu_put_pages(kvm, slots->memslots[i].base_gfn,
+ slots->memslots[i].npages);
}

return 0;
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index bc23b8e..86dd8f3 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -375,12 +375,16 @@ static struct kvm *kvm_create_vm(void)
INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
#endif

+ r = -ENOMEM;
+ kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
+ if (!kvm->memslots)
+ goto out_err;
+
#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
page = alloc_page(GFP_KERNEL | __GFP_ZERO);
- if (!page) {
- r = -ENOMEM;
+ if (!page)
goto out_err;
- }
+
kvm->coalesced_mmio_ring =
(struct kvm_coalesced_mmio_ring *)page_address(page);
#endif
@@ -416,6 +420,7 @@ out:
out_err:
hardware_disable_all();
out_err_nodisable:
+ kfree(kvm->memslots);
kfree(kvm);
return ERR_PTR(r);
}
@@ -450,9 +455,12 @@ static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
void kvm_free_physmem(struct kvm *kvm)
{
int i;
+ struct kvm_memslots *slots = kvm->memslots;
+
+ for (i = 0; i < slots->nmemslots; ++i)
+ kvm_free_physmem_slot(&slots->memslots[i], NULL);

- for (i = 0; i < kvm->nmemslots; ++i)
- kvm_free_physmem_slot(&kvm->memslots[i], NULL);
+ kfree(kvm->memslots);
}

static void kvm_destroy_vm(struct kvm *kvm)
@@ -533,7 +541,7 @@ int __kvm_set_memory_region(struct kvm *kvm,
if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
goto out;

- memslot = &kvm->memslots[mem->slot];
+ memslot = &kvm->memslots->memslots[mem->slot];
base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
npages = mem->memory_size >> PAGE_SHIFT;

@@ -554,7 +562,7 @@ int __kvm_set_memory_region(struct kvm *kvm,
/* Check for overlaps */
r = -EEXIST;
for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
- struct kvm_memory_slot *s = &kvm->memslots[i];
+ struct kvm_memory_slot *s = &kvm->memslots->memslots[i];

if (s == memslot || !s->npages)
continue;
@@ -656,8 +664,8 @@ skip_lpage:
kvm_arch_flush_shadow(kvm);

spin_lock(&kvm->mmu_lock);
- if (mem->slot >= kvm->nmemslots)
- kvm->nmemslots = mem->slot + 1;
+ if (mem->slot >= kvm->memslots->nmemslots)
+ kvm->memslots->nmemslots = mem->slot + 1;

*memslot = new;
spin_unlock(&kvm->mmu_lock);
@@ -727,7 +735,7 @@ int kvm_get_dirty_log(struct kvm *kvm,
if (log->slot >= KVM_MEMORY_SLOTS)
goto out;

- memslot = &kvm->memslots[log->slot];
+ memslot = &kvm->memslots->memslots[log->slot];
r = -ENOENT;
if (!memslot->dirty_bitmap)
goto out;
@@ -781,9 +789,10 @@ EXPORT_SYMBOL_GPL(kvm_is_error_hva);
struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn)
{
int i;
+ struct kvm_memslots *slots = kvm->memslots;

- for (i = 0; i < kvm->nmemslots; ++i) {
- struct kvm_memory_slot *memslot = &kvm->memslots[i];
+ for (i = 0; i < slots->nmemslots; ++i) {
+ struct kvm_memory_slot *memslot = &slots->memslots[i];

if (gfn >= memslot->base_gfn
&& gfn < memslot->base_gfn + memslot->npages)
@@ -802,10 +811,11 @@ struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
{
int i;
+ struct kvm_memslots *slots = kvm->memslots;

gfn = unalias_gfn(kvm, gfn);
for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
- struct kvm_memory_slot *memslot = &kvm->memslots[i];
+ struct kvm_memory_slot *memslot = &slots->memslots[i];

if (gfn >= memslot->base_gfn
&& gfn < memslot->base_gfn + memslot->npages)
--
1.6.5.3


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