From 23fa18eaa71266feff7ba8d83022d9e1cc83c65a Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 07:42:03 +0000
Subject: [PATCH] disable pwm7
---
kernel/arch/arm64/kvm/arm.c | 34 ++++++++++++++++++++++++++--------
1 files changed, 26 insertions(+), 8 deletions(-)
diff --git a/kernel/arch/arm64/kvm/arm.c b/kernel/arch/arm64/kvm/arm.c
index 0ef3bfe..0470eba 100644
--- a/kernel/arch/arm64/kvm/arm.c
+++ b/kernel/arch/arm64/kvm/arm.c
@@ -750,7 +750,7 @@
* involves poking the GIC, which must be done in a
* non-preemptible context.
*/
- migrate_disable();
+ preempt_disable();
kvm_pmu_flush_hwstate(vcpu);
@@ -799,7 +799,7 @@
kvm_timer_sync_user(vcpu);
kvm_vgic_sync_hwstate(vcpu);
local_irq_enable();
- migrate_enable();
+ preempt_enable();
continue;
}
@@ -871,7 +871,7 @@
/* Exit types that need handling before we can be preempted */
handle_exit_early(vcpu, ret);
- migrate_enable();
+ preempt_enable();
/*
* The ARMv8 architecture doesn't give the hypervisor
@@ -2061,6 +2061,11 @@
return -ENODEV;
}
+ if (kvm_get_mode() == KVM_MODE_NONE) {
+ kvm_info("KVM disabled from command line\n");
+ return -ENODEV;
+ }
+
in_hyp_mode = is_kernel_in_hyp_mode();
if (cpus_have_final_cap(ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE) ||
@@ -2093,18 +2098,18 @@
err = kvm_init_vector_slots();
if (err) {
kvm_err("Cannot initialise vector slots\n");
- goto out_err;
+ goto out_hyp;
}
err = init_subsystems();
if (err)
- goto out_hyp;
+ goto out_subs;
if (!in_hyp_mode) {
err = finalize_hyp_mode();
if (err) {
kvm_err("Failed to finalize Hyp protection\n");
- goto out_hyp;
+ goto out_subs;
}
}
@@ -2118,8 +2123,9 @@
return 0;
-out_hyp:
+out_subs:
hyp_cpu_pm_exit();
+out_hyp:
if (!in_hyp_mode)
teardown_hyp_mode();
out_err:
@@ -2137,13 +2143,25 @@
if (!arg)
return -EINVAL;
+ if (strcmp(arg, "none") == 0) {
+ kvm_mode = KVM_MODE_NONE;
+ return 0;
+ }
+
+ if (!is_hyp_mode_available()) {
+ pr_warn_once("KVM is not available. Ignoring kvm-arm.mode\n");
+ return 0;
+ }
+
if (strcmp(arg, "protected") == 0) {
kvm_mode = KVM_MODE_PROTECTED;
return 0;
}
- if (strcmp(arg, "nvhe") == 0 && !WARN_ON(is_kernel_in_hyp_mode()))
+ if (strcmp(arg, "nvhe") == 0 && !WARN_ON(is_kernel_in_hyp_mode())) {
+ kvm_mode = KVM_MODE_DEFAULT;
return 0;
+ }
return -EINVAL;
}
--
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