KVM: VMX: Fix commit which broke PML

I found PML was broken since below commit:

	commit feda805fe7c4ed9cf78158e73b1218752e3b4314
	Author: Xiao Guangrong <guangrong.xiao@linux.intel.com>
	Date:   Wed Sep 9 14:05:55 2015 +0800

	KVM: VMX: unify SECONDARY_VM_EXEC_CONTROL update

	Unify the update in vmx_cpuid_update()

	Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
	[Rewrite to use vmcs_set_secondary_exec_control. - Paolo]
	Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
The reason is in above commit vmx_cpuid_update calls vmx_secondary_exec_control,
in which currently SECONDARY_EXEC_ENABLE_PML bit is cleared unconditionally (as
PML is enabled in creating vcpu). Therefore if vcpu_cpuid_update is called after
vcpu is created, PML will be disabled unexpectedly while log-dirty code still
thinks PML is used.

Fix this by clearing SECONDARY_EXEC_ENABLE_PML in vmx_secondary_exec_control
only when PML is not supported or not enabled (!enable_pml). This is more
reasonable as PML is currently either always enabled or disabled. With this
explicit updating SECONDARY_EXEC_ENABLE_PML in vmx_enable{disable}_pml is not
needed so also rename vmx_enable{disable}_pml to vmx_create{destroy}_pml_buffer.

Fixes: feda805fe7c4ed9cf78158e73b1218752e3b4314
Signed-off-by: Kai Huang <kai.huang@linux.intel.com>
[While at it, change a wrong ASSERT to an "if".  The condition can happen
 if creating the VCPU fails with ENOMEM. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 2ac1164..5eb56ed 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -4718,8 +4718,9 @@ static u32 vmx_secondary_exec_control(struct vcpu_vmx *vmx)
           a current VMCS12
        */
        exec_control &= ~SECONDARY_EXEC_SHADOW_VMCS;
-       /* PML is enabled/disabled in creating/destorying vcpu */
-       exec_control &= ~SECONDARY_EXEC_ENABLE_PML;
+
+       if (!enable_pml)
+               exec_control &= ~SECONDARY_EXEC_ENABLE_PML;
 
        /* Currently, we allow L1 guest to directly run pcommit instruction. */
        exec_control &= ~SECONDARY_EXEC_PCOMMIT;
@@ -7804,7 +7805,7 @@ static void vmx_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2)
        *info2 = vmcs_read32(VM_EXIT_INTR_INFO);
 }
 
-static int vmx_enable_pml(struct vcpu_vmx *vmx)
+static int vmx_create_pml_buffer(struct vcpu_vmx *vmx)
 {
        struct page *pml_pg;
 
@@ -7817,18 +7818,15 @@ static int vmx_enable_pml(struct vcpu_vmx *vmx)
        vmcs_write64(PML_ADDRESS, page_to_phys(vmx->pml_pg));
        vmcs_write16(GUEST_PML_INDEX, PML_ENTITY_NUM - 1);
 
-       vmcs_set_bits(SECONDARY_VM_EXEC_CONTROL, SECONDARY_EXEC_ENABLE_PML);
-
        return 0;
 }
 
-static void vmx_disable_pml(struct vcpu_vmx *vmx)
+static void vmx_destroy_pml_buffer(struct vcpu_vmx *vmx)
 {
-       ASSERT(vmx->pml_pg);
-       __free_page(vmx->pml_pg);
-       vmx->pml_pg = NULL;
-
-       vmcs_clear_bits(SECONDARY_VM_EXEC_CONTROL, SECONDARY_EXEC_ENABLE_PML);
+       if (vmx->pml_pg) {
+               __free_page(vmx->pml_pg);
+               vmx->pml_pg = NULL;
+       }
 }
 
 static void vmx_flush_pml_buffer(struct kvm_vcpu *vcpu)
@@ -8706,7 +8704,7 @@ static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
        struct vcpu_vmx *vmx = to_vmx(vcpu);
 
        if (enable_pml)
-               vmx_disable_pml(vmx);
+               vmx_destroy_pml_buffer(vmx);
        free_vpid(vmx->vpid);
        leave_guest_mode(vcpu);
        vmx_load_vmcs01(vcpu);
@@ -8790,7 +8788,7 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
         * for the guest, etc.
         */
        if (enable_pml) {
-               err = vmx_enable_pml(vmx);
+               err = vmx_create_pml_buffer(vmx);
                if (err)
                        goto free_vmcs;
        }