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Subject[PATCH 4.14 27/64] KVM: VMX: introduce alloc_loaded_vmcs
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Paolo Bonzini pbonzini@redhat.com

commit f21f165ef922c2146cc5bdc620f542953c41714b

Group together the calls to alloc_vmcs and loaded_vmcs_init. Soon we'll also
allocate an MSR bitmap there.

Cc: stable@vger.kernel.org # prereq for Spectre mitigation
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/x86/kvm/vmx.c | 36 ++++++++++++++++++++++--------------
1 file changed, 22 insertions(+), 14 deletions(-)

--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3814,11 +3814,6 @@ static struct vmcs *alloc_vmcs_cpu(int c
return vmcs;
}

-static struct vmcs *alloc_vmcs(void)
-{
- return alloc_vmcs_cpu(raw_smp_processor_id());
-}
-
static void free_vmcs(struct vmcs *vmcs)
{
free_pages((unsigned long)vmcs, vmcs_config.order);
@@ -3837,6 +3832,22 @@ static void free_loaded_vmcs(struct load
WARN_ON(loaded_vmcs->shadow_vmcs != NULL);
}

+static struct vmcs *alloc_vmcs(void)
+{
+ return alloc_vmcs_cpu(raw_smp_processor_id());
+}
+
+static int alloc_loaded_vmcs(struct loaded_vmcs *loaded_vmcs)
+{
+ loaded_vmcs->vmcs = alloc_vmcs();
+ if (!loaded_vmcs->vmcs)
+ return -ENOMEM;
+
+ loaded_vmcs->shadow_vmcs = NULL;
+ loaded_vmcs_init(loaded_vmcs);
+ return 0;
+}
+
static void free_kvm_area(void)
{
int cpu;
@@ -7135,12 +7146,11 @@ static int enter_vmx_operation(struct kv
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
struct vmcs *shadow_vmcs;
+ int r;

- vmx->nested.vmcs02.vmcs = alloc_vmcs();
- vmx->nested.vmcs02.shadow_vmcs = NULL;
- if (!vmx->nested.vmcs02.vmcs)
+ r = alloc_loaded_vmcs(&vmx->nested.vmcs02);
+ if (r < 0)
goto out_vmcs02;
- loaded_vmcs_init(&vmx->nested.vmcs02);

if (cpu_has_vmx_msr_bitmap()) {
vmx->nested.msr_bitmap =
@@ -9535,13 +9545,11 @@ static struct kvm_vcpu *vmx_create_vcpu(
if (!vmx->guest_msrs)
goto free_pml;

- vmx->loaded_vmcs = &vmx->vmcs01;
- vmx->loaded_vmcs->vmcs = alloc_vmcs();
- vmx->loaded_vmcs->shadow_vmcs = NULL;
- if (!vmx->loaded_vmcs->vmcs)
+ err = alloc_loaded_vmcs(&vmx->vmcs01);
+ if (err < 0)
goto free_msrs;
- loaded_vmcs_init(vmx->loaded_vmcs);

+ vmx->loaded_vmcs = &vmx->vmcs01;
cpu = get_cpu();
vmx_vcpu_load(&vmx->vcpu, cpu);
vmx->vcpu.cpu = cpu;

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