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Diffstat (limited to 'arch/x86/kvm/x86.c')
-rw-r--r--arch/x86/kvm/x86.c92
1 files changed, 55 insertions, 37 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 1f48ec871035..e3b3141db13c 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -181,7 +181,7 @@ int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
int ret;
u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
- mutex_lock(&vcpu->kvm->lock);
+ down_read(&current->mm->mmap_sem);
ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte,
offset * sizeof(u64), sizeof(pdpte));
if (ret < 0) {
@@ -198,7 +198,7 @@ int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
memcpy(vcpu->arch.pdptrs, pdpte, sizeof(vcpu->arch.pdptrs));
out:
- mutex_unlock(&vcpu->kvm->lock);
+ up_read(&current->mm->mmap_sem);
return ret;
}
@@ -212,13 +212,13 @@ static bool pdptrs_changed(struct kvm_vcpu *vcpu)
if (is_long_mode(vcpu) || !is_pae(vcpu))
return false;
- mutex_lock(&vcpu->kvm->lock);
+ down_read(&current->mm->mmap_sem);
r = kvm_read_guest(vcpu->kvm, vcpu->arch.cr3 & ~31u, pdpte, sizeof(pdpte));
if (r < 0)
goto out;
changed = memcmp(pdpte, vcpu->arch.pdptrs, sizeof(pdpte)) != 0;
out:
- mutex_unlock(&vcpu->kvm->lock);
+ up_read(&current->mm->mmap_sem);
return changed;
}
@@ -278,9 +278,7 @@ void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
kvm_x86_ops->set_cr0(vcpu, cr0);
vcpu->arch.cr0 = cr0;
- mutex_lock(&vcpu->kvm->lock);
kvm_mmu_reset_context(vcpu);
- mutex_unlock(&vcpu->kvm->lock);
return;
}
EXPORT_SYMBOL_GPL(set_cr0);
@@ -320,9 +318,7 @@ void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
}
kvm_x86_ops->set_cr4(vcpu, cr4);
vcpu->arch.cr4 = cr4;
- mutex_lock(&vcpu->kvm->lock);
kvm_mmu_reset_context(vcpu);
- mutex_unlock(&vcpu->kvm->lock);
}
EXPORT_SYMBOL_GPL(set_cr4);
@@ -360,7 +356,7 @@ void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
*/
}
- mutex_lock(&vcpu->kvm->lock);
+ down_read(&current->mm->mmap_sem);
/*
* Does the new cr3 value map to physical memory? (Note, we
* catch an invalid cr3 even in real-mode, because it would
@@ -376,7 +372,7 @@ void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
vcpu->arch.cr3 = cr3;
vcpu->arch.mmu.new_cr3(vcpu);
}
- mutex_unlock(&vcpu->kvm->lock);
+ up_read(&current->mm->mmap_sem);
}
EXPORT_SYMBOL_GPL(set_cr3);
@@ -1211,12 +1207,12 @@ static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
return -EINVAL;
- mutex_lock(&kvm->lock);
+ down_write(&current->mm->mmap_sem);
kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
- mutex_unlock(&kvm->lock);
+ up_write(&current->mm->mmap_sem);
return 0;
}
@@ -1265,7 +1261,7 @@ static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
< alias->target_phys_addr)
goto out;
- mutex_lock(&kvm->lock);
+ down_write(&current->mm->mmap_sem);
p = &kvm->arch.aliases[alias->slot];
p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
@@ -1279,7 +1275,7 @@ static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
kvm_mmu_zap_all(kvm);
- mutex_unlock(&kvm->lock);
+ up_write(&current->mm->mmap_sem);
return 0;
@@ -1355,7 +1351,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
struct kvm_memory_slot *memslot;
int is_dirty = 0;
- mutex_lock(&kvm->lock);
+ down_write(&current->mm->mmap_sem);
r = kvm_get_dirty_log(kvm, log, &is_dirty);
if (r)
@@ -1371,7 +1367,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
}
r = 0;
out:
- mutex_unlock(&kvm->lock);
+ up_write(&current->mm->mmap_sem);
return r;
}
@@ -1565,25 +1561,32 @@ int emulator_read_std(unsigned long addr,
struct kvm_vcpu *vcpu)
{
void *data = val;
+ int r = X86EMUL_CONTINUE;
+ down_read(&current->mm->mmap_sem);
while (bytes) {
gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
unsigned offset = addr & (PAGE_SIZE-1);
unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
int ret;
- if (gpa == UNMAPPED_GVA)
- return X86EMUL_PROPAGATE_FAULT;
+ if (gpa == UNMAPPED_GVA) {
+ r = X86EMUL_PROPAGATE_FAULT;
+ goto out;
+ }
ret = kvm_read_guest(vcpu->kvm, gpa, data, tocopy);
- if (ret < 0)
- return X86EMUL_UNHANDLEABLE;
+ if (ret < 0) {
+ r = X86EMUL_UNHANDLEABLE;
+ goto out;
+ }
bytes -= tocopy;
data += tocopy;
addr += tocopy;
}
-
- return X86EMUL_CONTINUE;
+out:
+ up_read(&current->mm->mmap_sem);
+ return r;
}
EXPORT_SYMBOL_GPL(emulator_read_std);
@@ -1601,7 +1604,9 @@ static int emulator_read_emulated(unsigned long addr,
return X86EMUL_CONTINUE;
}
+ down_read(&current->mm->mmap_sem);
gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
+ up_read(&current->mm->mmap_sem);
/* For APIC access vmexit */
if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
@@ -1617,11 +1622,14 @@ mmio:
/*
* Is this MMIO handled locally?
*/
+ mutex_lock(&vcpu->kvm->lock);
mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
if (mmio_dev) {
kvm_iodevice_read(mmio_dev, gpa, bytes, val);
+ mutex_unlock(&vcpu->kvm->lock);
return X86EMUL_CONTINUE;
}
+ mutex_unlock(&vcpu->kvm->lock);
vcpu->mmio_needed = 1;
vcpu->mmio_phys_addr = gpa;
@@ -1636,10 +1644,14 @@ static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
{
int ret;
+ down_read(&current->mm->mmap_sem);
ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
- if (ret < 0)
+ if (ret < 0) {
+ up_read(&current->mm->mmap_sem);
return 0;
+ }
kvm_mmu_pte_write(vcpu, gpa, val, bytes);
+ up_read(&current->mm->mmap_sem);
return 1;
}
@@ -1649,7 +1661,11 @@ static int emulator_write_emulated_onepage(unsigned long addr,
struct kvm_vcpu *vcpu)
{
struct kvm_io_device *mmio_dev;
- gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
+ gpa_t gpa;
+
+ down_read(&current->mm->mmap_sem);
+ gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
+ up_read(&current->mm->mmap_sem);
if (gpa == UNMAPPED_GVA) {
kvm_inject_page_fault(vcpu, addr, 2);
@@ -1667,11 +1683,14 @@ mmio:
/*
* Is this MMIO handled locally?
*/
+ mutex_lock(&vcpu->kvm->lock);
mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
if (mmio_dev) {
kvm_iodevice_write(mmio_dev, gpa, bytes, val);
+ mutex_unlock(&vcpu->kvm->lock);
return X86EMUL_CONTINUE;
}
+ mutex_unlock(&vcpu->kvm->lock);
vcpu->mmio_needed = 1;
vcpu->mmio_phys_addr = gpa;
@@ -1718,11 +1737,14 @@ static int emulator_cmpxchg_emulated(unsigned long addr,
#ifndef CONFIG_X86_64
/* guests cmpxchg8b have to be emulated atomically */
if (bytes == 8) {
- gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
+ gpa_t gpa;
struct page *page;
char *addr;
u64 val;
+ down_read(&current->mm->mmap_sem);
+ gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
+
if (gpa == UNMAPPED_GVA ||
(gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
goto emul_write;
@@ -1736,8 +1758,9 @@ static int emulator_cmpxchg_emulated(unsigned long addr,
set_64bit((u64 *)(addr + offset_in_page(gpa)), val);
kunmap_atomic(addr, KM_USER0);
kvm_release_page_dirty(page);
+ emul_write:
+ up_read(&current->mm->mmap_sem);
}
-emul_write:
#endif
return emulator_write_emulated(addr, new, bytes, vcpu);
@@ -2118,10 +2141,10 @@ int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
kvm_x86_ops->skip_emulated_instruction(vcpu);
for (i = 0; i < nr_pages; ++i) {
- mutex_lock(&vcpu->kvm->lock);
+ down_read(&current->mm->mmap_sem);
page = gva_to_page(vcpu, address + i * PAGE_SIZE);
vcpu->arch.pio.guest_pages[i] = page;
- mutex_unlock(&vcpu->kvm->lock);
+ up_read(&current->mm->mmap_sem);
if (!page) {
kvm_inject_gp(vcpu, 0);
free_pio_guest_pages(vcpu);
@@ -2247,7 +2270,6 @@ int kvm_fix_hypercall(struct kvm_vcpu *vcpu)
char instruction[3];
int ret = 0;
- mutex_lock(&vcpu->kvm->lock);
/*
* Blow out the MMU to ensure that no other VCPU has an active mapping
@@ -2262,8 +2284,6 @@ int kvm_fix_hypercall(struct kvm_vcpu *vcpu)
!= X86EMUL_CONTINUE)
ret = -EFAULT;
- mutex_unlock(&vcpu->kvm->lock);
-
return ret;
}
@@ -2447,8 +2467,10 @@ static void vapic_enter(struct kvm_vcpu *vcpu)
if (!apic || !apic->vapic_addr)
return;
+ down_read(&current->mm->mmap_sem);
page = gfn_to_page(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
vcpu->arch.apic->vapic_page = page;
+ up_read(&current->mm->mmap_sem);
}
static void vapic_exit(struct kvm_vcpu *vcpu)
@@ -2910,13 +2932,13 @@ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
gpa_t gpa;
vcpu_load(vcpu);
- mutex_lock(&vcpu->kvm->lock);
+ down_read(&current->mm->mmap_sem);
gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, vaddr);
+ up_read(&current->mm->mmap_sem);
tr->physical_address = gpa;
tr->valid = gpa != UNMAPPED_GVA;
tr->writeable = 1;
tr->usermode = 0;
- mutex_unlock(&vcpu->kvm->lock);
vcpu_put(vcpu);
return 0;
@@ -3185,13 +3207,11 @@ int kvm_arch_set_memory_region(struct kvm *kvm,
*/
if (!user_alloc) {
if (npages && !old.rmap) {
- down_write(&current->mm->mmap_sem);
memslot->userspace_addr = do_mmap(NULL, 0,
npages * PAGE_SIZE,
PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS,
0);
- up_write(&current->mm->mmap_sem);
if (IS_ERR((void *)memslot->userspace_addr))
return PTR_ERR((void *)memslot->userspace_addr);
@@ -3199,10 +3219,8 @@ int kvm_arch_set_memory_region(struct kvm *kvm,
if (!old.user_alloc && old.rmap) {
int ret;
- down_write(&current->mm->mmap_sem);
ret = do_munmap(current->mm, old.userspace_addr,
old.npages * PAGE_SIZE);
- up_write(&current->mm->mmap_sem);
if (ret < 0)
printk(KERN_WARNING
"kvm_vm_ioctl_set_memory_region: "
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-17 23:25:24 +0000