67 lines
2.0 KiB
Diff
67 lines
2.0 KiB
Diff
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From dfedc889fafd35efd4f8382b7672bf0e556f9f45 Mon Sep 17 00:00:00 2001
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From: Peng Liang <liangpeng10@huawei.com>
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Date: Mon, 7 Sep 2020 14:07:07 +0800
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Subject: [PATCH] target/arm: ignore evtstrm and cpuid CPU features
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evtstrm and cpuid cann't be controlled by VMM:
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1. evtstrm: The generic timer is configured to generate events at a
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frequency of approximately 100KHz. It's controlled by the linux
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kernel config CONFIG_ARM_ARCH_TIMER_EVTSTREAM.
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2. cpuid: EL0 access to certain ID registers is available. It's always
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set by linux kernel after 77c97b4ee2129 ("arm64: cpufeature: Expose
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CPUID registers by emulation").
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However, they are exposed by getauxval() and /proc/cpuinfo. Hence,
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let's report and ignore the CPU features if someone set them.
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Signed-off-by: Peng Liang <liangpeng10@huawei.com>
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---
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target/arm/cpu64.c | 29 ++++++++++++++++++++++++++++-
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1 file changed, 28 insertions(+), 1 deletion(-)
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diff --git a/target/arm/cpu64.c b/target/arm/cpu64.c
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index 7de20848..726d123d 100644
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--- a/target/arm/cpu64.c
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+++ b/target/arm/cpu64.c
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@@ -506,10 +506,37 @@ static void arm_cpu_parse_featurestr(const char *typename, char *features,
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}
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}
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+static const char *unconfigurable_feats[] = {
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+ "evtstrm",
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+ "cpuid",
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+ NULL
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+};
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+
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+static bool is_configurable_feat(const char *name)
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+{
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+ int i;
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+
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+ for (i = 0; unconfigurable_feats[i]; ++i) {
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+ if (g_strcmp0(unconfigurable_feats[i], name) == 0) {
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+ return false;
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+ }
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+ }
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+
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+ return true;
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+}
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+
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static void
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cpu_add_feat_as_prop(const char *typename, const char *name, const char *val)
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{
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- GlobalProperty *prop = g_new0(typeof(*prop), 1);
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+ GlobalProperty *prop;
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+
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+ if (!is_configurable_feat(name)) {
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+ info_report("CPU feature '%s' is not configurable by QEMU. Ignore it.",
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+ name);
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+ return;
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+ }
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+
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+ prop = g_new0(typeof(*prop), 1);
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prop->driver = typename;
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prop->property = g_strdup(name);
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prop->value = g_strdup(val);
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--
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2.28.0
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