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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.

Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
Link: https://lore.kernel.org/r/f78ddb64087df27e7bcb1ae0ab53f55aa0804fab.1739226950.git.ashish.kalra@amd.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2025-02-10 22:54:02 +00:00
parent f73542501f
commit a6136669da
1 changed files with 10 additions and 0 deletions
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10
arch/x86/kvm/svm/sev.c
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@ -2951,6 +2951,16 @@ 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);