[PATCH v5 03/31] KVM: Allow KVM implementations to switch off MMIO independent of Kconfig

[Steffen Eiden]

Only defining KVM_MMIO is not flexible enough for multi-KVM systems
where one KVM implements MMIO but others do not. Solve this by
additionally testing for the non-existence of KVM_NO_MMIO before
including MMIO code to KVM.

Signed-off-by: Steffen Eiden <seiden@xxxxxxxxxxxxx>
---
 virt/kvm/coalesced_mmio.c | 4 ++++
 virt/kvm/coalesced_mmio.h | 2 +-
 virt/kvm/kvm_main.c       | 8 ++++----
 3 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c
index 6b1d90161099..8ff9d9a6f47a 100644
--- a/virt/kvm/coalesced_mmio.c
+++ b/virt/kvm/coalesced_mmio.c
@@ -15,6 +15,8 @@
 #include <linux/slab.h>
 #include <linux/kvm.h>
 
+#ifndef KVM_NO_MMIO
+
 #include "coalesced_mmio.h"
 
 static inline struct kvm_coalesced_mmio_dev *to_mmio(struct kvm_io_device *dev)
@@ -188,3 +190,5 @@ int kvm_vm_ioctl_unregister_coalesced_mmio(struct kvm *kvm,
 	 */
 	return 0;
 }
+
+#endif /* ifndef KVM_NO_MMIO */
diff --git a/virt/kvm/coalesced_mmio.h b/virt/kvm/coalesced_mmio.h
index 36f84264ed25..826af421a5be 100644
--- a/virt/kvm/coalesced_mmio.h
+++ b/virt/kvm/coalesced_mmio.h
@@ -11,7 +11,7 @@
  *
  */
 
-#ifdef CONFIG_KVM_MMIO
+#if defined(CONFIG_KVM_MMIO) && !defined(KVM_NO_MMIO)
 
 #include <linux/list.h>
 
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 18eb3d5d04f4..bb3682d8e1f7 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -4056,7 +4056,7 @@ static vm_fault_t kvm_vcpu_fault(struct vm_fault *vmf)
 	else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
 		page = virt_to_page(vcpu->arch.pio_data);
 #endif
-#ifdef CONFIG_KVM_MMIO
+#if defined(CONFIG_KVM_MMIO) && !defined(KVM_NO_MMIO)
 	else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
 		page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
 #endif
@@ -4882,7 +4882,7 @@ static int kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
 	case KVM_CAP_ENABLE_CAP_VM:
 	case KVM_CAP_HALT_POLL:
 		return 1;
-#ifdef CONFIG_KVM_MMIO
+#if defined(CONFIG_KVM_MMIO) && !defined(KVM_NO_MMIO)
 	case KVM_CAP_COALESCED_MMIO:
 		return KVM_COALESCED_MMIO_PAGE_OFFSET;
 	case KVM_CAP_COALESCED_PIO:
@@ -5223,7 +5223,7 @@ static long kvm_vm_ioctl(struct file *filp,
 		break;
 	}
 #endif
-#ifdef CONFIG_KVM_MMIO
+#if defined(CONFIG_KVM_MMIO) && !defined(KVM_NO_MMIO)
 	case KVM_REGISTER_COALESCED_MMIO: {
 		struct kvm_coalesced_mmio_zone zone;
 
@@ -5558,7 +5558,7 @@ static long kvm_dev_ioctl(struct file *filp,
 #ifdef CONFIG_X86
 		r += PAGE_SIZE;    /* pio data page */
 #endif
-#ifdef CONFIG_KVM_MMIO
+#if defined(CONFIG_KVM_MMIO) && !defined(KVM_NO_MMIO)
 		r += PAGE_SIZE;    /* coalesced mmio ring page */
 #endif
 		break;
-- 
2.53.0