Commit 5ce45c7a authored by Laszlo Ersek's avatar Laszlo Ersek Committed by Paolo Bonzini

hw/isa/lpc_ich9: add broadcast SMI feature

The generic edk2 SMM infrastructure prefers
EFI_SMM_CONTROL2_PROTOCOL.Trigger() to inject an SMI on each processor. If
Trigger() only brings the current processor into SMM, then edk2 handles it
in the following ways:

(1) If Trigger() is executed by the BSP (which is guaranteed before
    ExitBootServices(), but is not necessarily true at runtime), then:

    (a) If edk2 has been configured for "traditional" SMM synchronization,
        then the BSP sends directed SMIs to the APs with APIC delivery,
        bringing them into SMM individually. Then the BSP runs the SMI
        handler / dispatcher.

    (b) If edk2 has been configured for "relaxed" SMM synchronization,
        then the APs that are not already in SMM are not brought in, and
        the BSP runs the SMI handler / dispatcher.

(2) If Trigger() is executed by an AP (which is possible after
    ExitBootServices(), and can be forced e.g. by "taskset -c 1
    efibootmgr"), then the AP in question brings in the BSP with a
    directed SMI, and the BSP runs the SMI handler / dispatcher.

The smaller problem with (1a) and (2) is that the BSP and AP
synchronization is slow. For example, the "taskset -c 1 efibootmgr"
command from (2) can take more than 3 seconds to complete, because
efibootmgr accesses non-volatile UEFI variables intensively.

The larger problem is that QEMU's current behavior diverges from the
behavior usually seen on physical hardware, and that keeps exposing
obscure corner cases, race conditions and other instabilities in edk2,
which generally expects / prefers a software SMI to affect all CPUs at

Therefore introduce the "broadcast SMI" feature that causes QEMU to inject
the SMI on all VCPUs.

While the original posting of this patch
only intended to speed up (2), based on our recent "stress testing" of SMM
this patch actually provides functional improvements.

Cc: "Michael S. Tsirkin" <>
Cc: Gerd Hoffmann <>
Cc: Igor Mammedov <>
Cc: Paolo Bonzini <>
Signed-off-by: 's avatarLaszlo Ersek <>
Reviewed-by: 's avatarMichael S. Tsirkin <>
Reviewed-by: 's avatarIgor Mammedov <>
Message-Id: <>
Signed-off-by: 's avatarPaolo Bonzini <>
parent 50de920b
......@@ -437,7 +437,15 @@ static void ich9_apm_ctrl_changed(uint32_t val, void *arg)
/* SMI_EN = PMBASE + 30. SMI control and enable register */
if (lpc->pm.smi_en & ICH9_PMIO_SMI_EN_APMC_EN) {
cpu_interrupt(current_cpu, CPU_INTERRUPT_SMI);
if (lpc->smi_negotiated_features &
CPUState *cs;
cpu_interrupt(cs, CPU_INTERRUPT_SMI);
} else {
cpu_interrupt(current_cpu, CPU_INTERRUPT_SMI);
......@@ -250,4 +250,7 @@ Object *ich9_lpc_find(void);
#define ICH9_SMB_HST_D1 0x06
#define ICH9_SMB_HOST_BLOCK_DB 0x07
/* bit positions used in fw_cfg SMI feature negotiation */
#endif /* HW_ICH9_H */
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