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authorMarc Orr <marcorr@google.com>2018-05-15 13:37:37 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2018-06-01 19:18:26 +0200
commitd1e5b0e98ea27b4f17871dc4e8ea4b0447e35221 (patch)
treeb0e6a402dc55ae6809456f40b690360cc8b687ca /arch/x86/kvm
parentkvm: Change return type to vm_fault_t (diff)
downloadlinux-d1e5b0e98ea27b4f17871dc4e8ea4b0447e35221.tar.xz
linux-d1e5b0e98ea27b4f17871dc4e8ea4b0447e35221.zip
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: Marc Orr <marcorr@google.com> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
-rw-r--r--arch/x86/kvm/svm.c4
-rw-r--r--arch/x86/kvm/vmx.c4
2 files changed, 4 insertions, 4 deletions
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index de21d5c5168b..d9305f1723f5 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -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)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index e50beb76d846..d205e9246f99 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -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)