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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2020-07-23 16:27:01 +0200 |
|---|---|---|
| committer | Eduardo Habkost <ehabkost@redhat.com> | 2020-07-23 15:03:54 -0400 |
| commit | 0baa4b445e28f37243e5dc72e7efe32f0c9d7801 (patch) | |
| tree | 78ee53139eca0e3d49bea9c956f7a74d7a1cda10 /target | |
| parent | 8ffa52c20d5693d454f65f2024a1494edfea65d4 (diff) | |
| download | qemu-0baa4b445e28f37243e5dc72e7efe32f0c9d7801.zip qemu-0baa4b445e28f37243e5dc72e7efe32f0c9d7801.tar.gz qemu-0baa4b445e28f37243e5dc72e7efe32f0c9d7801.tar.bz2 | |
KVM: fix CPU reset wrt HF2_GIF_MASK
HF2_GIF_MASK is set in env->hflags2 unconditionally on CPU reset
(see x86_cpu_reset()) but when calling KVM_SET_NESTED_STATE,
KVM_STATE_NESTED_GIF_SET is only valid for nSVM as e.g. nVMX code
looks like
if (kvm_state->hdr.vmx.vmxon_pa == -1ull) {
if (kvm_state->flags & ~KVM_STATE_NESTED_EVMCS)
return -EINVAL;
}
Also, when adjusting the environment after KVM_GET_NESTED_STATE we
need not reset HF2_GIF_MASK on VMX as e.g. x86_cpu_pending_interrupt()
expects it to be set.
Alternatively, we could've made env->hflags2 SVM-only.
Reported-by: Jan Kiszka <jan.kiszka@siemens.com>
Fixes: b16c0e20c742 ("KVM: add support for AMD nested live migration")
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20200723142701.2521161-1-vkuznets@redhat.com>
Tested-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Diffstat (limited to 'target')
| -rw-r--r-- | target/i386/kvm.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/target/i386/kvm.c b/target/i386/kvm.c index b8455c8..6f18d94 100644 --- a/target/i386/kvm.c +++ b/target/i386/kvm.c @@ -3877,7 +3877,9 @@ static int kvm_put_nested_state(X86CPU *cpu) } else { env->nested_state->flags &= ~KVM_STATE_NESTED_GUEST_MODE; } - if (env->hflags2 & HF2_GIF_MASK) { + + /* Don't set KVM_STATE_NESTED_GIF_SET on VMX as it is illegal */ + if (cpu_has_svm(env) && (env->hflags2 & HF2_GIF_MASK)) { env->nested_state->flags |= KVM_STATE_NESTED_GIF_SET; } else { env->nested_state->flags &= ~KVM_STATE_NESTED_GIF_SET; @@ -3919,10 +3921,14 @@ static int kvm_get_nested_state(X86CPU *cpu) } else { env->hflags &= ~HF_GUEST_MASK; } - if (env->nested_state->flags & KVM_STATE_NESTED_GIF_SET) { - env->hflags2 |= HF2_GIF_MASK; - } else { - env->hflags2 &= ~HF2_GIF_MASK; + + /* Keep HF2_GIF_MASK set on !SVM as x86_cpu_pending_interrupt() needs it */ + if (cpu_has_svm(env)) { + if (env->nested_state->flags & KVM_STATE_NESTED_GIF_SET) { + env->hflags2 |= HF2_GIF_MASK; + } else { + env->hflags2 &= ~HF2_GIF_MASK; + } } return ret; |