KVM: x86: rdpmc emulation checks the counter incorrectly
The rdpmc emulation checks that the counter (ECX) is not higher than 2, without
taking into considerations bits 30:31 role (e.g., bit 30 marks whether the
counter is fixed). The fix uses the pmu information for checking the validity
of the pmu counter.
Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index be3f764..3da8d82 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -3507,7 +3507,7 @@
u64 rcx = reg_read(ctxt, VCPU_REGS_RCX);
if ((!(cr4 & X86_CR4_PCE) && ctxt->ops->cpl(ctxt)) ||
- (rcx > 3))
+ ctxt->ops->check_pmc(ctxt, rcx))
return emulate_gp(ctxt, 0);
return X86EMUL_CONTINUE;