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KVM: arm64: Do arm/arch initialization without bouncing through kvm_init()

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Do arm/arch specific initialization directly in arm's module_init(), now
called kvm_arm_init(), instead of bouncing through kvm_init() to reach
kvm_arch_init().  Invoking kvm_arch_init() is the very first action
performed by kvm_init(), so from a initialization perspective this is a
glorified nop.

Avoiding kvm_arch_init() also fixes a mostly benign bug as kvm_arch_exit()
doesn't properly unwind if a later stage of kvm_init() fails.  While the
soon-to-be-deleted comment about compiling as a module being unsupported
is correct, kvm_arch_exit() can still be called by kvm_init() if any step
after the call to kvm_arch_init() succeeds.

Add a FIXME to call out that pKVM initialization isn't unwound if
kvm_init() fails, which is a pre-existing problem inherited from
kvm_arch_exit().

Making kvm_arch_init() a nop will also allow dropping kvm_arch_init() and
kvm_arch_exit() entirely once all other architectures follow suit.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20221130230934.1014142-20-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2022-11-30 23:09:03 +00:00 committed by Paolo Bonzini
parent 78b3bf485d
commit 1dc0f02d53
1 changed files with 16 additions and 9 deletions
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25
arch/arm64/kvm/arm.c
View file

@ -2207,7 +2207,7 @@ void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *cons)
/**
* Initialize Hyp-mode and memory mappings on all CPUs.
*/
int kvm_arch_init(void *opaque)
int kvm_arm_init(void)
{
int err;
bool in_hyp_mode;
@ -2281,6 +2281,14 @@ int kvm_arch_init(void *opaque)
kvm_info("Hyp mode initialized successfully\n");
}
/*
* FIXME: Do something reasonable if kvm_init() fails after pKVM
* hypervisor protection is finalized.
*/
err = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
if (err)
goto out_subs;
return 0;
out_subs:
@ -2293,10 +2301,15 @@ int kvm_arch_init(void *opaque)
return err;
}
int kvm_arch_init(void *opaque)
{
return 0;
}
/* NOP: Compiling as a module not supported */
void kvm_arch_exit(void)
{
kvm_unregister_perf_callbacks();
}
static int __init early_kvm_mode_cfg(char *arg)
@ -2337,10 +2350,4 @@ enum kvm_mode kvm_get_mode(void)
return kvm_mode;
}
static int arm_init(void)
{
int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
return rc;
}
module_init(arm_init);
module_init(kvm_arm_init);