Commit d1e5b0e9 authored by Marc Orr's avatar Marc Orr Committed by Paolo Bonzini

kvm: Make VM ioctl do valloc for some archs

The kvm struct has been bloating. For example, it's tens of kilo-bytes
for x86, which turns out to be a large amount of memory to allocate
contiguously via kzalloc. Thus, this patch does the following:
1. Uses architecture-specific routines to allocate the kvm struct via
   vzalloc for x86.
2. Switches arm to __KVM_HAVE_ARCH_VM_ALLOC so that it can use vzalloc
   when has_vhe() is true.

Other architectures continue to default to kalloc, as they have a
dependency on kalloc or have a small-enough struct kvm.
Signed-off-by: default avatarMarc Orr <marcorr@google.com>
Reviewed-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 1499fa80
......@@ -324,4 +324,8 @@ static inline bool kvm_arm_harden_branch_predictor(void)
static inline void kvm_vcpu_load_sysregs(struct kvm_vcpu *vcpu) {}
static inline void kvm_vcpu_put_sysregs(struct kvm_vcpu *vcpu) {}
#define __KVM_HAVE_ARCH_VM_ALLOC
struct kvm *kvm_arch_alloc_vm(void);
void kvm_arch_free_vm(struct kvm *kvm);
#endif /* __ARM_KVM_HOST_H__ */
......@@ -482,4 +482,8 @@ static inline bool kvm_arm_harden_branch_predictor(void)
void kvm_vcpu_load_sysregs(struct kvm_vcpu *vcpu);
void kvm_vcpu_put_sysregs(struct kvm_vcpu *vcpu);
#define __KVM_HAVE_ARCH_VM_ALLOC
struct kvm *kvm_arch_alloc_vm(void);
void kvm_arch_free_vm(struct kvm *kvm);
#endif /* __ARM64_KVM_HOST_H__ */
......@@ -1852,13 +1852,13 @@ static void __unregister_enc_region_locked(struct kvm *kvm,
static struct kvm *svm_vm_alloc(void)
{
struct kvm_svm *kvm_svm = kzalloc(sizeof(struct kvm_svm), GFP_KERNEL);
struct kvm_svm *kvm_svm = vzalloc(sizeof(struct kvm_svm));
return &kvm_svm->kvm;
}
static void svm_vm_free(struct kvm *kvm)
{
kfree(to_kvm_svm(kvm));
vfree(to_kvm_svm(kvm));
}
static void sev_vm_destroy(struct kvm *kvm)
......
......@@ -10139,13 +10139,13 @@ STACK_FRAME_NON_STANDARD(vmx_vcpu_run);
static struct kvm *vmx_vm_alloc(void)
{
struct kvm_vmx *kvm_vmx = kzalloc(sizeof(struct kvm_vmx), GFP_KERNEL);
struct kvm_vmx *kvm_vmx = vzalloc(sizeof(struct kvm_vmx));
return &kvm_vmx->kvm;
}
static void vmx_vm_free(struct kvm *kvm)
{
kfree(to_kvm_vmx(kvm));
vfree(to_kvm_vmx(kvm));
}
static void vmx_switch_vmcs(struct kvm_vcpu *vcpu, struct loaded_vmcs *vmcs)
......
......@@ -19,6 +19,7 @@
#include <linux/preempt.h>
#include <linux/msi.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/rcupdate.h>
#include <linux/ratelimit.h>
#include <linux/err.h>
......@@ -811,6 +812,10 @@ bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu);
int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu);
#ifndef __KVM_HAVE_ARCH_VM_ALLOC
/*
* All architectures that want to use vzalloc currently also
* need their own kvm_arch_alloc_vm implementation.
*/
static inline struct kvm *kvm_arch_alloc_vm(void)
{
return kzalloc(sizeof(struct kvm), GFP_KERNEL);
......
......@@ -251,6 +251,21 @@ long kvm_arch_dev_ioctl(struct file *filp,
return -EINVAL;
}
struct kvm *kvm_arch_alloc_vm(void)
{
if (!has_vhe())
return kzalloc(sizeof(struct kvm), GFP_KERNEL);
return vzalloc(sizeof(struct kvm));
}
void kvm_arch_free_vm(struct kvm *kvm)
{
if (!has_vhe())
kfree(kvm);
else
vfree(kvm);
}
struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
{
......
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