From: Sean Christopherson seanjc@google.com
[ Upstream commit f31b88b35f90f6b7ae4abc1015494a285f459221 ]
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 Message-Id: 20210422021125.3417167-3-seanjc@google.com Signed-off-by: Paolo Bonzini pbonzini@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/x86/kvm/svm/sev.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 80c49a5e593a..7c233c79c124 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -1276,8 +1276,11 @@ 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); + sev_asid_bitmap = NULL; goto out; + }
pr_info("SEV supported: %u ASIDs\n", max_sev_asid - min_sev_asid + 1); sev_supported = true;