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KVM: x86: Prevent excluding the BSP on setting max_vcpu_ids

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If the BSP vCPU ID was already set, ensure it doesn't get excluded when
limiting vCPU IDs via KVM_CAP_MAX_VCPU_ID.

[mks: provide commit message, code by Sean]

Signed-off-by: Mathias Krause <minipli@grsecurity.net>
Link: https://lore.kernel.org/r/20240614202859.3597745-4-minipli@grsecurity.net
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson
2024-06-14 22:28:57 +02:00
parent 7c305d5118
commit d29bf2ca14
1 changed files with 3 additions and 1 deletions
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arch/x86/kvm/x86.c
+3 -1
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@@ -6707,7 +6707,9 @@ split_irqchip_unlock:
break;
mutex_lock(&kvm->lock);
if (kvm->arch.max_vcpu_ids == cap->args[0]) {
if (kvm->arch.bsp_vcpu_id > cap->args[0]) {
;
} else if (kvm->arch.max_vcpu_ids == cap->args[0]) {
r = 0;
} else if (!kvm->arch.max_vcpu_ids) {
kvm->arch.max_vcpu_ids = cap->args[0];