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KVM: Opt out of generic hardware enabling on s390 and PPC

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Allow architectures to opt out of the generic hardware enabling logic,
and opt out on both s390 and PPC, which don't need to manually enable
virtualization as it's always on (when available).

In addition to letting s390 and PPC drop a bit of dead code, this will
hopefully also allow ARM to clean up its related code, e.g. ARM has its
own per-CPU flag to track which CPUs have enable hardware due to the
need to keep hardware enabled indefinitely when pKVM is enabled.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Acked-by: Anup Patel <anup@brainfault.org>
Message-Id: <20221130230934.1014142-50-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson
2022-11-30 23:09:33 +00:00
committed by Paolo Bonzini
parent 35774a9f94
commit 441f7bfa99
11 changed files with 35 additions and 19 deletions
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4
include/linux/kvm_host.h
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@@ -1441,8 +1441,10 @@ void kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu, struct dentry *debugfs_
static inline void kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu) {}
#endif
#ifdef CONFIG_KVM_GENERIC_HARDWARE_ENABLING
int kvm_arch_hardware_enable(void);
void kvm_arch_hardware_disable(void);
#endif
int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu);
int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu);
@@ -2074,7 +2076,9 @@ static inline bool kvm_check_request(int req, struct kvm_vcpu *vcpu)
}
}
#ifdef CONFIG_KVM_GENERIC_HARDWARE_ENABLING
extern bool kvm_rebooting;
#endif
extern unsigned int halt_poll_ns;
extern unsigned int halt_poll_ns_grow;