| Date | Wed, 13 Jan 2021 16:36:56 -0800 | Subject | [PATCH v2 02/14] KVM: SVM: Free sev_asid_bitmap during init if SEV setup fails | From | Sean Christopherson <> |
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Free sev_asid_bitmap if the reclaim bitmap allocation fails, othwerise KVM will unnecessarily keep the bitmap when SEV is not fully enabled.
Freeing the page is also necessary to avoid introducing a bug when a future patch eliminates svm_sev_enabled() in favor of using the global 'sev' flag directly. While sev_hardware_enabled() checks max_sev_asid, which is true even if KVM setup fails, 'sev' will be true if and only if KVM setup fully succeeds.
Fixes: 33af3a7ef9e6 ("KVM: SVM: Reduce WBINVD/DF_FLUSH invocations") Cc: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Sean Christopherson <seanjc@google.com> --- arch/x86/kvm/svm/sev.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index c8ffdbc81709..0eeb6e1b803d 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -1274,8 +1274,10 @@ void __init sev_hardware_setup(void) goto out; sev_reclaim_asid_bitmap = bitmap_zalloc(max_sev_asid, GFP_KERNEL); - if (!sev_reclaim_asid_bitmap) + if (!sev_reclaim_asid_bitmap) { + bitmap_free(sev_asid_bitmap); goto out; + } pr_info("SEV supported: %u ASIDs\n", max_sev_asid - min_sev_asid + 1); sev_supported = true; -- 2.30.0.284.gd98b1dd5eaa7-goog
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