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KVM: SVM: Ensure PSP module is initialized if KVM module is built-in

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The kernel's initcall infrastructure lacks the ability to express
dependencies between initcalls, whereas the modules infrastructure
automatically handles dependencies via symbol loading.  Ensure the
PSP SEV driver is initialized before proceeding in sev_hardware_setup()
if KVM is built-in as the dependency isn't handled by the initcall
infrastructure.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
Message-ID: <f78ddb64087df27e7bcb1ae0ab53f55aa0804fab.1739226950.git.ashish.kalra@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2025-02-10 22:54:02 +00:00 • committed by Paolo Bonzini
parent 435b344a70
commit 44e70718df
1 changed files with 10 additions and 0 deletions
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10
arch/x86/kvm/svm/sev.c
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@ -2972,6 +2972,16 @@ void __init sev_hardware_setup(void)
WARN_ON_ONCE(!boot_cpu_has(X86_FEATURE_FLUSHBYASID)))
goto out;
/*
* The kernel's initcall infrastructure lacks the ability to express
* dependencies between initcalls, whereas the modules infrastructure
* automatically handles dependencies via symbol loading. Ensure the
* PSP SEV driver is initialized before proceeding if KVM is built-in,
* as the dependency isn't handled by the initcall infrastructure.
*/
if (IS_BUILTIN(CONFIG_KVM_AMD) && sev_module_init())
goto out;
/* Retrieve SEV CPUID information */
cpuid(0x8000001f, &eax, &ebx, &ecx, &edx);