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kvm: Make VM ioctl do valloc for some archs

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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>
This commit is contained in:
Marc Orr
2018-05-15 04:37:37 -07:00
committed by Paolo Bonzini
parent 1499fa809e
commit d1e5b0e98e
6 changed files with 32 additions and 4 deletions
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4
arch/x86/kvm/vmx.c
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@@ -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)