[PATCH 04/45] KVM: VMX: Allocate VPID after initializing VCPU

Sean Christopherson
2019-10-22T01:58:44Z

Do VPID allocation after calling the common kvm_vcpu_init() as a step
towards doing vCPU allocation (via kmem_cache_zalloc()) and calling
kvm_vcpu_init() back-to-back. Squishing allocation and initialization
together will eventually allow the sequence to be moved to arch-agnostic
creation code.

Note, the VPID is not consumed until KVM_RUN, slightly delaying its
allocation should have no real function impact. VPID allocation was
arbitrarily placed in the original patch, commit 2384d2b326408 ("KVM:
VMX: Enable Virtual Processor Identification (VPID)").

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
arch/x86/kvm/vmx/vmx.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index e660e28e9ae0..501e88bd6204 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6726,14 +6726,14 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
goto free_user_fpu;
}

- vmx->vpid = allocate_vpid();
-
err = kvm_vcpu_init(&vmx->vcpu, kvm, id);
if (err)
goto free_vcpu;

err = -ENOMEM;

+ vmx->vpid = allocate_vpid();
+
/*
* If PML is turned on, failure on enabling PML just results in failure
* of creating the vcpu, therefore we can simplify PML logic (by
@@ -6823,8 +6823,8 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
vmx_destroy_pml_buffer(vmx);
uninit_vcpu:
kvm_vcpu_uninit(&vmx->vcpu);
+ free_vpid(vmx->vpid);
free_vcpu:
- free_vpid(vmx->vpid);
kmem_cache_free(x86_fpu_cache, vmx->vcpu.arch.guest_fpu);
free_user_fpu:
kmem_cache_free(x86_fpu_cache, vmx->vcpu.arch.user_fpu);
--
2.22.0