[PATCH] KVM: Assert that struct kvm_vcpu is always as offset zero

[Sean Christopherson]

KVM implementations that wrap struct kvm_vcpu with a vendor specific
struct, e.g. struct vcpu_vmx, must place the vcpu member at offset 0,
otherwise the usercopy region intended to encompass struct kvm_vcpu_arch
will instead overlap random chunks of the vendor specific struct.
E.g. padding a large number of bytes before struct kvm_vcpu triggers
a usercopy warn when running with CONFIG_HARDENED_USERCOPY=y.

Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
---

Note, the PowerPC change is completely untested.

 arch/powerpc/kvm/e500.c | 3 +++
 arch/x86/kvm/svm.c      | 3 +++
 arch/x86/kvm/vmx/vmx.c  | 3 +++
 3 files changed, 9 insertions(+)

diff --git a/arch/powerpc/kvm/e500.c b/arch/powerpc/kvm/e500.c
index b5a848a55504..00649ca5fa9a 100644
--- a/arch/powerpc/kvm/e500.c
+++ b/arch/powerpc/kvm/e500.c
@@ -440,6 +440,9 @@ static struct kvm_vcpu *kvmppc_core_vcpu_create_e500(struct kvm *kvm,
 	struct kvm_vcpu *vcpu;
 	int err;
 
+	BUILD_BUG_ON_MSG(offsetof(struct kvmppc_vcpu_e500, vcpu) != 0,
+		"struct kvm_vcpu must be at offset 0 for arch usercopy region");
+
 	vcpu_e500 = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 	if (!vcpu_e500) {
 		err = -ENOMEM;
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index d685491fce4d..70015ae5fc19 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2137,6 +2137,9 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
 	struct page *nested_msrpm_pages;
 	int err;
 
+	BUILD_BUG_ON_MSG(offsetof(struct vcpu_svm, vcpu) != 0,
+		"struct kvm_vcpu must be at offset 0 for arch usercopy region");
+
 	svm = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL_ACCOUNT);
 	if (!svm) {
 		err = -ENOMEM;
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 42ed3faa6af8..402cf2fe5cdd 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6615,6 +6615,9 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
 	unsigned long *msr_bitmap;
 	int cpu;
 
+	BUILD_BUG_ON_MSG(offsetof(struct vcpu_vmx, vcpu) != 0,
+		"struct kvm_vcpu must be at offset 0 for arch usercopy region");
+
 	vmx = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL_ACCOUNT);
 	if (!vmx)
 		return ERR_PTR(-ENOMEM);
-- 
2.22.0