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KVM: x86: Consolidate VM allocation and free for VMX and SVM

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Move the VM allocation and free code to common x86 as the logic is
more or less identical across SVM and VMX.

Note, although hyperv.hv_pa_pg is part of the common kvm->arch, it's
(currently) only allocated by VMX VMs.  But, since kfree() plays nice
when passed a NULL pointer, the superfluous call for SVM is harmless
and avoids future churn if SVM gains support for HyperV's direct TLB
flush.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
[Make vm_size a field instead of a function. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2020-01-26 16:41:13 -08:00 committed by Paolo Bonzini
parent 1a625056cc
commit 562b6b089d
4 changed files with 13 additions and 39 deletions
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12
arch/x86/include/asm/kvm_host.h
View File

@ -1059,8 +1059,7 @@ struct kvm_x86_ops {
bool (*has_emulated_msr)(int index);
void (*cpuid_update)(struct kvm_vcpu *vcpu);
struct kvm *(*vm_alloc)(void);
void (*vm_free)(struct kvm *);
unsigned int vm_size;
int (*vm_init)(struct kvm *kvm);
void (*vm_destroy)(struct kvm *kvm);
@ -1278,13 +1277,10 @@ extern struct kmem_cache *x86_fpu_cache;
#define __KVM_HAVE_ARCH_VM_ALLOC
static inline struct kvm *kvm_arch_alloc_vm(void)
{
return kvm_x86_ops->vm_alloc();
}
static inline void kvm_arch_free_vm(struct kvm *kvm)
{
return kvm_x86_ops->vm_free(kvm);
return __vmalloc(kvm_x86_ops->vm_size,
GFP_KERNEL_ACCOUNT | __GFP_ZERO, PAGE_KERNEL);
}
void kvm_arch_free_vm(struct kvm *kvm);
#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLB
static inline int kvm_arch_flush_remote_tlb(struct kvm *kvm)

16
arch/x86/kvm/svm.c
View File

@ -1944,19 +1944,6 @@ static void __unregister_enc_region_locked(struct kvm *kvm,
kfree(region);
}
static struct kvm *svm_vm_alloc(void)
{
BUILD_BUG_ON(offsetof(struct kvm_svm, kvm) != 0);
return __vmalloc(sizeof(struct kvm_svm),
GFP_KERNEL_ACCOUNT | __GFP_ZERO, PAGE_KERNEL);
}
static void svm_vm_free(struct kvm *kvm)
{
vfree(kvm);
}
static void sev_vm_destroy(struct kvm *kvm)
{
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
@ -7395,8 +7382,7 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
.vcpu_free = svm_free_vcpu,
.vcpu_reset = svm_vcpu_reset,
.vm_alloc = svm_vm_alloc,
.vm_free = svm_vm_free,
.vm_size = sizeof(struct kvm_svm),
.vm_init = svm_vm_init,
.vm_destroy = svm_vm_destroy,

17
arch/x86/kvm/vmx/vmx.c
View File

@ -6679,20 +6679,6 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
vmx_complete_interrupts(vmx);
}
static struct kvm *vmx_vm_alloc(void)
{
BUILD_BUG_ON(offsetof(struct kvm_vmx, kvm) != 0);
return __vmalloc(sizeof(struct kvm_vmx),
GFP_KERNEL_ACCOUNT | __GFP_ZERO, PAGE_KERNEL);
}
static void vmx_vm_free(struct kvm *kvm)
{
kfree(kvm->arch.hyperv.hv_pa_pg);
vfree(kvm);
}
static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
@ -7835,9 +7821,8 @@ static struct kvm_x86_ops vmx_x86_ops __ro_after_init = {
.cpu_has_accelerated_tpr = report_flexpriority,
.has_emulated_msr = vmx_has_emulated_msr,
.vm_size = sizeof(struct kvm_vmx),
.vm_init = vmx_vm_init,
.vm_alloc = vmx_vm_alloc,
.vm_free = vmx_vm_free,
.vcpu_create = vmx_create_vcpu,
.vcpu_free = vmx_free_vcpu,

7
arch/x86/kvm/x86.c
View File

@ -9622,6 +9622,13 @@ void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu)
kvm_x86_ops->sched_in(vcpu, cpu);
}
void kvm_arch_free_vm(struct kvm *kvm)
{
kfree(kvm->arch.hyperv.hv_pa_pg);
vfree(kvm);
}
int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
{
if (type)