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| author | Sean Christopherson <seanjc@google.com> | 2022-12-01 02:09:03 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-12-29 23:41:08 +0300 |
| commit | 1dc0f02d53382a016e57fcd24a42f8f62bd02fd4 (patch) | |
| tree | eb09b8c952cc64fb68d337ad4d564267c18cadd8 /arch/arm64/kvm/arm.c | |
| parent | 78b3bf485d5cb5b9a11ff6e1d4b76cbf2f2360ef (diff) | |
| download | linux-1dc0f02d53382a016e57fcd24a42f8f62bd02fd4.tar.xz | |
KVM: arm64: Do arm/arch initialization without bouncing through kvm_init()
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>
Diffstat (limited to 'arch/arm64/kvm/arm.c')
| -rw-r--r-- | arch/arm64/kvm/arm.c | 25 |
1 files changed, 16 insertions, 9 deletions
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 31151589dc5e..86800fe4d8c6 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -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 @@ out_err: 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); |