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    Subject[PATCH v19 100/130] KVM: TDX: handle EXIT_REASON_OTHER_SMI
    Date
    From: Isaku Yamahata <isaku.yamahata@intel.com>

    If the control reaches EXIT_REASON_OTHER_SMI, #SMI is delivered and
    handled right after returning from the TDX module to KVM nothing needs to
    be done in KVM. Continue TDX vcpu execution.

    Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
    Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
    ---
    arch/x86/include/uapi/asm/vmx.h | 1 +
    arch/x86/kvm/vmx/tdx.c | 7 +++++++
    2 files changed, 8 insertions(+)

    diff --git a/arch/x86/include/uapi/asm/vmx.h b/arch/x86/include/uapi/asm/vmx.h
    index a5faf6d88f1b..b3a30ef3efdd 100644
    --- a/arch/x86/include/uapi/asm/vmx.h
    +++ b/arch/x86/include/uapi/asm/vmx.h
    @@ -34,6 +34,7 @@
    #define EXIT_REASON_TRIPLE_FAULT 2
    #define EXIT_REASON_INIT_SIGNAL 3
    #define EXIT_REASON_SIPI_SIGNAL 4
    +#define EXIT_REASON_OTHER_SMI 6

    #define EXIT_REASON_INTERRUPT_WINDOW 7
    #define EXIT_REASON_NMI_WINDOW 8
    diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
    index cba0fd5029be..2f68e6f2b53a 100644
    --- a/arch/x86/kvm/vmx/tdx.c
    +++ b/arch/x86/kvm/vmx/tdx.c
    @@ -1345,6 +1345,13 @@ int tdx_handle_exit(struct kvm_vcpu *vcpu, fastpath_t fastpath)
    WARN_ON_ONCE(fastpath != EXIT_FASTPATH_NONE);

    switch (exit_reason.basic) {
    + case EXIT_REASON_OTHER_SMI:
    + /*
    + * If reach here, it's not a Machine Check System Management
    + * Interrupt(MSMI). #SMI is delivered and handled right after
    + * SEAMRET, nothing needs to be done in KVM.
    + */
    + return 1;
    default:
    break;
    }
    --
    2.25.1

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