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KVM: Drop kvm_arch_create_memslot()

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Remove kvm_arch_create_memslot() now that all arch implementations are
effectively nops.  Removing kvm_arch_create_memslot() eliminates the
possibility for arch specific code to allocate memory prior to setting
a memslot, which sets the stage for simplifying kvm_free_memslot().

Cc: Janosch Frank <frankja@linux.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2020-02-18 13:07:20 -08:00 committed by Paolo Bonzini
parent 0dab98b7ad
commit 414de7abbf
7 changed files with 7 additions and 46 deletions
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6
arch/mips/kvm/mips.c
View File

@ -188,12 +188,6 @@ long kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl,
return -ENOIOCTLCMD;
}
int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
unsigned long npages)
{
return 0;
}
void kvm_arch_flush_shadow_all(struct kvm *kvm)
{
/* Flush whole GPA */

6
arch/powerpc/kvm/powerpc.c
View File

@ -691,12 +691,6 @@ void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
kvmppc_core_free_memslot(kvm, free, dont);
}
int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
unsigned long npages)
{
return 0;
}
int kvm_arch_prepare_memory_region(struct kvm *kvm,
struct kvm_memory_slot *memslot,
const struct kvm_userspace_memory_region *mem,

6
arch/s390/kvm/kvm-s390.c
View File

@ -4507,12 +4507,6 @@ vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
return VM_FAULT_SIGBUS;
}
int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
unsigned long npages)
{
return 0;
}
/* Section: memory related */
int kvm_arch_prepare_memory_region(struct kvm *kvm,
struct kvm_memory_slot *memslot,

6
arch/x86/kvm/x86.c
View File

@ -9873,12 +9873,6 @@ void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
kvm_page_track_free_memslot(free, dont);
}
int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
unsigned long npages)
{
return 0;
}
static int kvm_alloc_memslot_metadata(struct kvm_memory_slot *slot,
unsigned long npages)
{

2
include/linux/kvm_host.h
View File

@ -671,8 +671,6 @@ int __kvm_set_memory_region(struct kvm *kvm,
const struct kvm_userspace_memory_region *mem);
void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
struct kvm_memory_slot *dont);
int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
unsigned long npages);
void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen);
int kvm_arch_prepare_memory_region(struct kvm *kvm,
struct kvm_memory_slot *memslot,

6
virt/kvm/arm/mmu.c
View File

@ -2354,12 +2354,6 @@ void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
{
}
int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
unsigned long npages)
{
return 0;
}
void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen)
{
}

21
virt/kvm/kvm_main.c
View File

@ -1040,12 +1040,13 @@ int __kvm_set_memory_region(struct kvm *kvm,
new.base_gfn = base_gfn;
new.npages = npages;
new.flags = mem->flags;
new.userspace_addr = mem->userspace_addr;
if (npages) {
if (!old.npages)
change = KVM_MR_CREATE;
else { /* Modify an existing slot. */
if ((mem->userspace_addr != old.userspace_addr) ||
if ((new.userspace_addr != old.userspace_addr) ||
(npages != old.npages) ||
((new.flags ^ old.flags) & KVM_MEM_READONLY))
goto out;
@ -1080,22 +1081,14 @@ int __kvm_set_memory_region(struct kvm *kvm,
}
}
/* Free page dirty bitmap if unneeded */
r = -ENOMEM;
/* Allocate/free page dirty bitmap as needed */
if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
new.dirty_bitmap = NULL;
r = -ENOMEM;
if (change == KVM_MR_CREATE) {
new.userspace_addr = mem->userspace_addr;
if (kvm_arch_create_memslot(kvm, &new, npages))
goto out;
}
/* Allocate page dirty bitmap if needed */
if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
else if (!new.dirty_bitmap) {
if (kvm_create_dirty_bitmap(&new) < 0)
goto out_free;
goto out;
}
slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL_ACCOUNT);