If KVM cannot find an exact match for a requested CPUID leaf, the
code will try to find the closest match instead of simply confessing
it's failure.
The implementation was meant to satisfy the CPUID specification, but
did not properly check for extended and standard leaves and also
didn't account for the index subleaf.
Beside that this rule only applies to CPUID intercepts, which is not
the only user of the kvm_find_cpuid_entry() function.
So fix this algorithm and move it into kvm_emulate_cpuid().
This fixes a crash of newer Linux kernels as KVM guests on
AMD Bulldozer CPUs, where bogus values were returned in response to
a CPUID intercept.
CC: <sta...@kernel.org> [2.6.38]
Signed-off-by: Andre Przywara <andre.przyw...@amd.com>
---
arch/x86/kvm/x86.c | 19 +++++++++++++------
1 files changed, 13 insertions(+), 6 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 6e86cec..552b8f8 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4959,12 +4959,6 @@ struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct
kvm_vcpu *vcpu,
best = e;
break;
}
- /*
- * Both basic or both extended?
- */
- if (((e->function ^ function) & 0x80000000) == 0)
- if (!best || e->function > best->function)
- best = e;
}
return best;
}
@@ -4996,6 +4990,19 @@ void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
kvm_register_write(vcpu, VCPU_REGS_RCX, 0);
kvm_register_write(vcpu, VCPU_REGS_RDX, 0);
best = kvm_find_cpuid_entry(vcpu, function, index);
+
+ /* if no match is found, check whether we exceed the vCPU's limit
+ * and return the content of the highest valid standard leaf instead.
+ * This is to satisfy the CPUID specification.
+ */
+ if (!best) {
+ best = kvm_find_cpuid_entry(vcpu, function & 0x80000000, 0);
+ if (best && best->eax < function)
+ best = kvm_find_cpuid_entry(vcpu, best->eax, index);
+ else
+ best = NULL;
+ }
+
if (best) {
kvm_register_write(vcpu, VCPU_REGS_RAX, best->eax);
kvm_register_write(vcpu, VCPU_REGS_RBX, best->ebx);
--
1.6.4
--
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