[PATCH 1/2] KVM: x86: build kvm_userspace_memory_region in x86_set_memory_region

[Paolo Bonzini <pbonzini@redhat.com>]

The next patch will make x86_set_memory_region fill the
userspace_addr.  Since the struct is not used untouched
anymore, it makes sense to build it in x86_set_memory_region
directly; it also simplifies the callers.

Reported-by: Alexandre DERUMIER <aderumier@odiso.com>
Cc: stable@vger.kernel.org
Fixes: 9da0e4d5ac969909f6b435ce28ea28135a9cbd69
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 arch/x86/include/asm/kvm_host.h |  6 ++----
 arch/x86/kvm/vmx.c              | 26 ++++++--------------------
 arch/x86/kvm/x86.c              | 31 +++++++++++++------------------
 3 files changed, 21 insertions(+), 42 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 49ec9038ec14..4e7ad7e022b0 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1199,9 +1199,7 @@ void kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err);
 
 int kvm_is_in_guest(void);
 
-int __x86_set_memory_region(struct kvm *kvm,
-			    const struct kvm_userspace_memory_region *mem);
-int x86_set_memory_region(struct kvm *kvm,
-			  const struct kvm_userspace_memory_region *mem);
+int __x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa, u32 size);
+int x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa, u32 size);
 
 #endif /* _ASM_X86_KVM_HOST_H */
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 83b7b5cd75d5..562e2013234d 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -4105,17 +4105,13 @@ static void seg_setup(int seg)
 static int alloc_apic_access_page(struct kvm *kvm)
 {
 	struct page *page;
-	struct kvm_userspace_memory_region kvm_userspace_mem;
 	int r = 0;
 
 	mutex_lock(&kvm->slots_lock);
 	if (kvm->arch.apic_access_page_done)
 		goto out;
-	kvm_userspace_mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT;
-	kvm_userspace_mem.flags = 0;
-	kvm_userspace_mem.guest_phys_addr = APIC_DEFAULT_PHYS_BASE;
-	kvm_userspace_mem.memory_size = PAGE_SIZE;
-	r = __x86_set_memory_region(kvm, &kvm_userspace_mem);
+	r = __x86_set_memory_region(kvm, APIC_ACCESS_PAGE_PRIVATE_MEMSLOT,
+				    APIC_DEFAULT_PHYS_BASE, PAGE_SIZE);
 	if (r)
 		goto out;
 
@@ -4140,17 +4136,12 @@ static int alloc_identity_pagetable(struct kvm *kvm)
 {
 	/* Called with kvm->slots_lock held. */
 
-	struct kvm_userspace_memory_region kvm_userspace_mem;
 	int r = 0;
 
 	BUG_ON(kvm->arch.ept_identity_pagetable_done);
 
-	kvm_userspace_mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT;
-	kvm_userspace_mem.flags = 0;
-	kvm_userspace_mem.guest_phys_addr =
-		kvm->arch.ept_identity_map_addr;
-	kvm_userspace_mem.memory_size = PAGE_SIZE;
-	r = __x86_set_memory_region(kvm, &kvm_userspace_mem);
+	r = __x86_set_memory_region(kvm, IDENTITY_PAGETABLE_PRIVATE_MEMSLOT,
+				    kvm->arch.ept_identity_map_addr, PAGE_SIZE);
 
 	return r;
 }
@@ -4949,14 +4940,9 @@ static int vmx_interrupt_allowed(struct kvm_vcpu *vcpu)
 static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr)
 {
 	int ret;
-	struct kvm_userspace_memory_region tss_mem = {
-		.slot = TSS_PRIVATE_MEMSLOT,
-		.guest_phys_addr = addr,
-		.memory_size = PAGE_SIZE * 3,
-		.flags = 0,
-	};
 
-	ret = x86_set_memory_region(kvm, &tss_mem);
+	ret = x86_set_memory_region(kvm, TSS_PRIVATE_MEMSLOT, addr,
+				    PAGE_SIZE * 3);
 	if (ret)
 		return ret;
 	kvm->arch.tss_addr = addr;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 8f0f6eca69da..a3a4cf900e0c 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7714,18 +7714,21 @@ void kvm_arch_sync_events(struct kvm *kvm)
 	kvm_free_pit(kvm);
 }
 
-int __x86_set_memory_region(struct kvm *kvm,
-			    const struct kvm_userspace_memory_region *mem)
+int __x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa, u32 size)
 {
 	int i, r;
 
 	/* Called with kvm->slots_lock held.  */
-	BUG_ON(mem->slot >= KVM_MEM_SLOTS_NUM);
+	if (WARN_ON(id >= KVM_MEM_SLOTS_NUM))
+		return -EINVAL;
 
 	for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
-		struct kvm_userspace_memory_region m = *mem;
+		struct kvm_userspace_memory_region m;
 
-		m.slot |= i << 16;
+		m.slot = id | (i << 16);
+		m.flags = 0;
+		m.guest_phys_addr = gpa;
+		m.memory_size = size;
 		r = __kvm_set_memory_region(kvm, &m);
 		if (r < 0)
 			return r;
@@ -7735,13 +7738,12 @@ int __x86_set_memory_region(struct kvm *kvm,
 }
 EXPORT_SYMBOL_GPL(__x86_set_memory_region);
 
-int x86_set_memory_region(struct kvm *kvm,
-			  const struct kvm_userspace_memory_region *mem)
+int x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa, u32 size)
 {
 	int r;
 
 	mutex_lock(&kvm->slots_lock);
-	r = __x86_set_memory_region(kvm, mem);
+	r = __x86_set_memory_region(kvm, id, gpa, size);
 	mutex_unlock(&kvm->slots_lock);
 
 	return r;
@@ -7756,16 +7758,9 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
 		 * unless the the memory map has changed due to process exit
 		 * or fd copying.
 		 */
-		struct kvm_userspace_memory_region mem;
-		memset(&mem, 0, sizeof(mem));
-		mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT;
-		x86_set_memory_region(kvm, &mem);
-
-		mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT;
-		x86_set_memory_region(kvm, &mem);
-
-		mem.slot = TSS_PRIVATE_MEMSLOT;
-		x86_set_memory_region(kvm, &mem);
+		x86_set_memory_region(kvm, APIC_ACCESS_PAGE_PRIVATE_MEMSLOT, 0, 0);
+		x86_set_memory_region(kvm, IDENTITY_PAGETABLE_PRIVATE_MEMSLOT, 0, 0);
+		x86_set_memory_region(kvm, TSS_PRIVATE_MEMSLOT, 0, 0);
 	}
 	kvm_iommu_unmap_guest(kvm);
 	kfree(kvm->arch.vpic);
-- 
2.5.0