linux-kernel - [PATCH 5.10 539/545] kvm: x86/pmu: Fix the compare function used by the pmu event filter

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Date:   Fri, 19 Aug 2022 17:45:09 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Aaron Lewis <aaronlewis@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: [PATCH 5.10 539/545] kvm: x86/pmu: Fix the compare function used by the pmu event filter

From: Aaron Lewis <aaronlewis@...gle.com>

commit 4ac19ead0dfbabd8e0bfc731f507cfb0b95d6c99 upstream.

When returning from the compare function the u64 is truncated to an
int.  This results in a loss of the high nybble[1] in the event select
and its sign if that nybble is in use.  Switch from using a result that
can end up being truncated to a result that can only be: 1, 0, -1.

[1] bits 35:32 in the event select register and bits 11:8 in the event
    select.

Fixes: 7ff775aca48ad ("KVM: x86/pmu: Use binary search to check filtered events")
Signed-off-by: Aaron Lewis <aaronlewis@...gle.com>
Reviewed-by: Sean Christopherson <seanjc@...gle.com>
Message-Id: <20220517051238.2566934-1-aaronlewis@...gle.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/x86/kvm/pmu.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -170,9 +170,12 @@ static bool pmc_resume_counter(struct kv
 	return true;
 }
 
-static int cmp_u64(const void *a, const void *b)
+static int cmp_u64(const void *pa, const void *pb)
 {
-	return *(__u64 *)a - *(__u64 *)b;
+	u64 a = *(u64 *)pa;
+	u64 b = *(u64 *)pb;
+
+	return (a > b) - (a < b);
 }
 
 void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel)