[PATCH v2 2/3] KVM: VMX: Fold loaded_vmcs_init() into alloc_loaded_vmcs()

Sean Christopherson
2020-03-21T19:37:56Z

Subsume loaded_vmcs_init() into alloc_loaded_vmcs(), its only remaining
caller, and drop the VMCLEAR on the shadow VMCS, which is guaranteed to
be NULL. loaded_vmcs_init() was previously used by loaded_vmcs_clear(),
but loaded_vmcs_clear() also subsumed loaded_vmcs_init() to properly
handle smp_wmb() with respect to VMCLEAR.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
arch/x86/kvm/vmx/vmx.c | 14 ++++----------
arch/x86/kvm/vmx/vmx.h | 1 -
2 files changed, 4 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index efaca09455bf..07634caa560d 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -653,15 +653,6 @@ static int vmx_set_guest_msr(struct vcpu_vmx *vmx, struct shared_msr_entry *msr,
return ret;
}

-void loaded_vmcs_init(struct loaded_vmcs *loaded_vmcs)
-{
- vmcs_clear(loaded_vmcs->vmcs);
- if (loaded_vmcs->shadow_vmcs && loaded_vmcs->launched)
- vmcs_clear(loaded_vmcs->shadow_vmcs);
- loaded_vmcs->cpu = -1;
- loaded_vmcs->launched = 0;
-}
-
#ifdef CONFIG_KEXEC_CORE
static void crash_vmclear_local_loaded_vmcss(void)
{
@@ -2555,9 +2546,12 @@ int alloc_loaded_vmcs(struct loaded_vmcs *loaded_vmcs)
if (!loaded_vmcs->vmcs)
return -ENOMEM;

+ vmcs_clear(loaded_vmcs->vmcs);
+
loaded_vmcs->shadow_vmcs = NULL;
loaded_vmcs->hv_timer_soft_disabled = false;
- loaded_vmcs_init(loaded_vmcs);
+ loaded_vmcs->cpu = -1;
+ loaded_vmcs->launched = 0;

if (cpu_has_vmx_msr_bitmap()) {
loaded_vmcs->msr_bitmap = (unsigned long *)
diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h
index be93d597306c..79d38f41ef7a 100644
--- a/arch/x86/kvm/vmx/vmx.h
+++ b/arch/x86/kvm/vmx/vmx.h
@@ -492,7 +492,6 @@ struct vmcs *alloc_vmcs_cpu(bool shadow, int cpu, gfp_t flags);
void free_vmcs(struct vmcs *vmcs);
int alloc_loaded_vmcs(struct loaded_vmcs *loaded_vmcs);
void free_loaded_vmcs(struct loaded_vmcs *loaded_vmcs);
-void loaded_vmcs_init(struct loaded_vmcs *loaded_vmcs);
void loaded_vmcs_clear(struct loaded_vmcs *loaded_vmcs);

static inline struct vmcs *alloc_vmcs(bool shadow)
--
2.24.1