[PATCH 3.12 095/122] KVM: x86: Warn if guest virtual address space is not 48-bits

[Jiri Slaby]

From: Nadav Amit <namit@xxxxxxxxxxxxxxxxx>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit dd598091de4aabbc8bd7290a04f364e443c03455 upstream.

The KVM emulator code assumes that the guest virtual address space (in 64-bit)
is 48-bits wide.  Since we are about to add more code that makes the same
assumption, this patch adds an assertion to make sure guest virtual address
space is indeed 48-bits wide.

Signed-off-by: Nadav Amit <namit@xxxxxxxxxxxxxxxxx>
Signed-off-by: Bruce Rogers <brogers@xxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
 arch/x86/kvm/cpuid.c | 19 ++++++++++++-------
 arch/x86/kvm/cpuid.h |  2 +-
 2 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index b110fe6c03d4..b132551528e5 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -23,14 +23,14 @@
 #include "mmu.h"
 #include "trace.h"
 
-void kvm_update_cpuid(struct kvm_vcpu *vcpu)
+int kvm_update_cpuid(struct kvm_vcpu *vcpu)
 {
 	struct kvm_cpuid_entry2 *best;
 	struct kvm_lapic *apic = vcpu->arch.apic;
 
 	best = kvm_find_cpuid_entry(vcpu, 1, 0);
 	if (!best)
-		return;
+		return 0;
 
 	/* Update OSXSAVE bit */
 	if (cpu_has_xsave && best->function == 0x1) {
@@ -46,7 +46,15 @@ void kvm_update_cpuid(struct kvm_vcpu *vcpu)
 			apic->lapic_timer.timer_mode_mask = 1 << 17;
 	}
 
+	/* The existing code assumes virtual address is 48-bit in the canonical
+	 * address checks; exit if it is ever changed */
+	best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0);
+	if (best && ((best->eax & 0xff00) >> 8) != 48 &&
+		((best->eax & 0xff00) >> 8) != 0)
+		return -EINVAL;
+
 	kvm_pmu_cpuid_update(vcpu);
+	return 0;
 }
 
 static int is_efer_nx(void)
@@ -109,10 +117,9 @@ int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
 	}
 	vcpu->arch.cpuid_nent = cpuid->nent;
 	cpuid_fix_nx_cap(vcpu);
-	r = 0;
 	kvm_apic_set_version(vcpu);
 	kvm_x86_ops->cpuid_update(vcpu);
-	kvm_update_cpuid(vcpu);
+	r = kvm_update_cpuid(vcpu);
 
 out_free:
 	vfree(cpuid_entries);
@@ -136,9 +143,7 @@ int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
 	vcpu->arch.cpuid_nent = cpuid->nent;
 	kvm_apic_set_version(vcpu);
 	kvm_x86_ops->cpuid_update(vcpu);
-	kvm_update_cpuid(vcpu);
-	return 0;
-
+	r = kvm_update_cpuid(vcpu);
 out:
 	return r;
 }
diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
index b7fd07984888..6c458e37defb 100644
--- a/arch/x86/kvm/cpuid.h
+++ b/arch/x86/kvm/cpuid.h
@@ -3,7 +3,7 @@
 
 #include "x86.h"
 
-void kvm_update_cpuid(struct kvm_vcpu *vcpu);
+int kvm_update_cpuid(struct kvm_vcpu *vcpu);
 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
 					      u32 function, u32 index);
 int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
-- 
2.2.2

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