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KVM: SVM: Initialize per-CPU svm_data at the end of hardware setup

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Setup the per-CPU SVM data structures at the very end of hardware setup so
that svm_hardware_unsetup() can be used in svm_hardware_setup() to unwind
AVIC setup (for the GALog notifier).  Alternatively, the error path could
do an explicit, manual unwind, e.g. by adding a helper to free the per-CPU
structures.  But the per-CPU allocations have no interactions or
dependencies, i.e. can comfortably live at the end, and so converting to
a manual unwind would introduce churn and code without providing any
immediate advantage.

Link: https://patch.msgid.link/20251016190643.80529-2-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2025-10-16 12:06:41 -07:00
parent cab4098be4
commit 59a217ced3
1 changed files with 7 additions and 6 deletions
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13
arch/x86/kvm/svm/svm.c
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@ -5386,12 +5386,6 @@ static __init int svm_hardware_setup(void)
svm_hv_hardware_setup();
for_each_possible_cpu(cpu) {
r = svm_cpu_init(cpu);
if (r)
goto err;
}
enable_apicv = avic_hardware_setup();
if (!enable_apicv) {
enable_ipiv = false;
@ -5435,6 +5429,13 @@ static __init int svm_hardware_setup(void)
svm_set_cpu_caps();
kvm_caps.inapplicable_quirks &= ~KVM_X86_QUIRK_CD_NW_CLEARED;
for_each_possible_cpu(cpu) {
r = svm_cpu_init(cpu);
if (r)
goto err;
}
return 0;
err: