hvf: arm: disable SME when nested virt is active
Currently, Apple doesn't support the nested virtualisation + SME combination. Signed-off-by: Mohamed Mediouni <mohamed@unpredictable.fr> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Message-id: 20260429190532.26538-13-mohamed@unpredictable.fr Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Mohamed Mediouni committed
May 5, 2026 at 09:25 UTC
ca34bcb0141db5f380030a33048fbf620d7fea73
2 files changed
+10
target/arm/hvf/hvf.c
+5
@@ -1215,6 +1215,11 @@ static bool hvf_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf)
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FIELD_DP64_IDREG(&host_isar, ID_AA64DFR0, PMUVER, 0x1);
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}
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+ if (hvf_nested_virt_enabled()) {
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+ /* SME is not implemented with nested virt on the Apple side */
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+ FIELD_DP64_IDREG(&host_isar, ID_AA64PFR1, SME, 0);
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+ }
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+
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ahcf->isar = host_isar;
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/*
target/arm/hvf_arm.h
+5
@@ -11,6 +11,7 @@
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#ifndef QEMU_HVF_ARM_H
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#define QEMU_HVF_ARM_H
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+#include "system/hvf.h"
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#include "target/arm/cpu-qom.h"
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/**
@@ -35,6 +36,10 @@ void hvf_arm_set_cpu_features_from_host(ARMCPU *cpu);
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if (__builtin_available(macOS 15.2, *)) {
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size_t svl_bytes;
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hv_return_t result = hv_sme_config_get_max_svl_bytes(&svl_bytes);
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+ /* Nested virt not supported together with SME right now. */
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+ if (hvf_nested_virt_enabled()) {
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+ return false;
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+ }
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if (result == HV_UNSUPPORTED) {
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return false;
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}