[PULL 44/49] hvf: arm: allow exposing minimal PMU when running with nested virt on

Maintainers: "Alex Bennée" <alex.bennee@linaro.org>, "Philippe Mathieu-Daudé" <philmd@linaro.org>, Thomas Huth <thuth@redhat.com>, Cameron Esfahani <dirty@apple.com>, Roman Bolshakov <rbolshakov@ddn.com>, Phil Dennis-Jordan <phil@philjordan.eu>, Yi Liu <yi.l.liu@intel.com>, Eric Auger <eric.auger@redhat.com>, Zhenzhong Duan <zhenzhong.duan@intel.com>, "Marc-André Lureau" <marcandre.lureau@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Pierrick Bouvier <pierrick.bouvier@linaro.org>, Peter Maydell <peter.maydell@linaro.org>, "Cédric Le Goater" <clg@kaod.org>, Steven Lee <steven_lee@aspeedtech.com>, Troy Lee <leetroy@gmail.com>, Jamin Lin <jamin_lin@aspeedtech.com>, Andrew Jeffery <andrew@codeconstruct.com.au>, Joel Stanley <joel@jms.id.au>, Jason Wang <jasowang@redhat.com>, Peter Xu <peterx@redhat.com>, Fabiano Rosas <farosas@suse.de>, Laurent Vivier <lvivier@redhat.com>, Alexander Graf <agraf@csgraf.de>, Pedro Barbuda <pbarbuda@microsoft.com>, Mohamed Mediouni <mohamed@unpredictable.fr>, Alexander Bulekov <alxndr@bu.edu>, Stefan Hajnoczi <stefanha@redhat.com>, Darren Kenny <darren.kenny@oracle.com>, Qiuhao Li <Qiuhao.Li@outlook.com>, "Michael S. Tsirkin" <mst@redhat.com>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
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[PULL 44/49] hvf: arm: allow exposing minimal PMU when running with nested virt on
Posted by Peter Maydell 1 month, 1 week ago
From: Mohamed Mediouni <mohamed@unpredictable.fr>

When running with nested virt on, a minimum PMU is exposed by Hypervisor.framework
if a valid PMUVer register value is set. That PMU isn't exposed otherwise.

Signed-off-by: Mohamed Mediouni <mohamed@unpredictable.fr>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20260306130107.35359-13-mohamed@unpredictable.fr
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/hvf/hvf.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c
index 91bbb2013b..b50400d295 100644
--- a/target/arm/hvf/hvf.c
+++ b/target/arm/hvf/hvf.c
@@ -1145,6 +1145,10 @@ static bool hvf_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf)
 
     clamp_id_aa64mmfr0_parange_to_ipa_size(&host_isar);
 
+    if (hvf_nested_virt_enabled()) {
+        FIELD_DP64_IDREG(&host_isar, ID_AA64DFR0, PMUVER, 0x1);
+    }
+
     ahcf->isar = host_isar;
 
     /*
-- 
2.43.0