From: Sascha Bischoff Date: Mon, 8 Dec 2025 15:28:23 +0000 (+0000) Subject: KVM: arm64: Correct test for ICH_HCR_EL2_TDIR cap for GICv5 hosts X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=28e505d81766dcbe25c60d57ab9fc941cd3d38bf;p=thirdparty%2Flinux.git KVM: arm64: Correct test for ICH_HCR_EL2_TDIR cap for GICv5 hosts The original order of checks in the ICH_HCR_EL2_TDIR test returned with false early in the case where the native GICv3 CPUIF was not present. The result was that on GICv5 hosts with legacy support - which do not have the GICv3 CPUIF - the test always returned false. Reshuffle the checks such that support for GICv5 legacy is checked prior to checking for the native GICv3 CPUIF. Signed-off-by: Sascha Bischoff Fixes: 2a28810cbb8b2 ("KVM: arm64: GICv3: Detect and work around the lack of ICV_DIR_EL1 trapping") Link: https://patch.msgid.link/20251208152724.3637157-4-sascha.bischoff@arm.com Signed-off-by: Marc Zyngier --- diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index c840a93b9ef95..65aaea68adaa2 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -2326,16 +2326,16 @@ static bool can_trap_icv_dir_el1(const struct arm64_cpu_capabilities *entry, BUILD_BUG_ON(ARM64_HAS_ICH_HCR_EL2_TDIR <= ARM64_HAS_GICV3_CPUIF); BUILD_BUG_ON(ARM64_HAS_ICH_HCR_EL2_TDIR <= ARM64_HAS_GICV5_LEGACY); - if (!this_cpu_has_cap(ARM64_HAS_GICV3_CPUIF) && - !is_midr_in_range_list(has_vgic_v3)) - return false; - if (!is_hyp_mode_available()) return false; if (this_cpu_has_cap(ARM64_HAS_GICV5_LEGACY)) return true; + if (!this_cpu_has_cap(ARM64_HAS_GICV3_CPUIF) && + !is_midr_in_range_list(has_vgic_v3)) + return false; + if (is_kernel_in_hyp_mode()) res.a1 = read_sysreg_s(SYS_ICH_VTR_EL2); else