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KVM: arm64: Fix enforcement of upper bound on MDCR_EL2.HPMN

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Previously, u64_replace_bits() was used to no effect as the return value
was ignored. Convert to u64p_replace_bits() so the value is updated in
place.

Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Fixes: efff9dd2fe ("KVM: arm64: Handle out-of-bound write to MDCR_EL2.HPMN")
Link: https://lore.kernel.org/r/20250709093808.920284-2-ben.horgan@arm.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Ben Horgan 2025-07-09 10:38:07 +01:00 committed by Marc Zyngier
parent 42ce432522
commit 2265c08ec3
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/kvm/sys_regs.c
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@ -2624,7 +2624,7 @@ static bool access_mdcr(struct kvm_vcpu *vcpu,
*/
if (hpmn > vcpu->kvm->arch.nr_pmu_counters) {
hpmn = vcpu->kvm->arch.nr_pmu_counters;
u64_replace_bits(val, hpmn, MDCR_EL2_HPMN);
u64p_replace_bits(&val, hpmn, MDCR_EL2_HPMN);
}
__vcpu_assign_sys_reg(vcpu, MDCR_EL2, val);