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| author | Maxim Levitsky <mlevitsk@redhat.com> | 2022-05-12 13:14:20 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-05-12 09:51:26 -0400 |
| commit | 33fbe6befa622c082f7d417896832856814bdde0 (patch) | |
| tree | b28967677f9bd5d4cee83c4ac18b6b83330c6b6d /arch/x86/kvm | |
| parent | 9913288318aa4acf2c849add1616e9b4df5a7b44 (diff) | |
| download | linux-33fbe6befa622c082f7d417896832856814bdde0.tar.bz2 | |
KVM: x86: fix typo in __try_cmpxchg_user causing non-atomicness
This shows up as a TDP MMU leak when running nested. Non-working cmpxchg on L0
relies makes L1 install two different shadow pages under same spte, and one of
them is leaked.
Fixes: 1c2361f667f36 ("KVM: x86: Use __try_cmpxchg_user() to emulate atomic accesses")
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20220512101420.306759-1-mlevitsk@redhat.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/x86.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index ba4faeb32437..8f2108e86b02 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -7315,7 +7315,7 @@ static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt *ctxt, goto emul_write; hva = kvm_vcpu_gfn_to_hva(vcpu, gpa_to_gfn(gpa)); - if (kvm_is_error_hva(addr)) + if (kvm_is_error_hva(hva)) goto emul_write; hva += offset_in_page(gpa); |