D55426.id172486.diff
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D55426.id172486.diff
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	diff --git a/sys/x86/x86/msi.c b/sys/x86/x86/msi.c
	--- a/sys/x86/x86/msi.c
	+++ b/sys/x86/x86/msi.c
	@@ -95,6 +95,15 @@
	#define INTEL_DATA(msi) \
	(MSI_INTEL_DATA_TRGREDG \| MSI_INTEL_DATA_DELFIXED \| (msi)->msi_vector)

	+/* If in a VM with support for extended destination IDs, use them. */
	+static int ext_dest_id = 0;
	+SYSCTL_INT(_machdep, OID_AUTO, msi_ext_dest_id, CTLFLAG_RDTUN, &ext_dest_id, 0,
	+ "Hypervisor advertises support for APIC Extended Destination IDs");
	+#define INTEL_ADDR_EXT(msi) \
	+ (MSI_INTEL_ADDR_BASE \| ((msi)->msi_cpu & 0xff) << 12 \| \
	+ ((msi)->msi_cpu & 0x7f00) >> 3 \| \
	+ MSI_INTEL_ADDR_RH_OFF \| MSI_INTEL_ADDR_DM_PHYSICAL)
	+
	static MALLOC_DEFINE(M_MSI, "msi", "PCI MSI");

	/*
	@@ -652,13 +661,15 @@
	mtx_unlock(&msi_lock);
	error = EOPNOTSUPP;
	#endif
	- if (error == EOPNOTSUPP && msi->msi_cpu > 0xff) {
	+ if (error == EOPNOTSUPP &&
	+ (msi->msi_cpu > 0x7fff \|\|
	+ (msi->msi_cpu > 0xff && ext_dest_id == 0))) {
	printf("%s: unsupported destination APIC ID %u\n", __func__,
	msi->msi_cpu);
	error = EINVAL;
	}
	if (error == EOPNOTSUPP) {
	- *addr = INTEL_ADDR(msi);
	+ *addr = ext_dest_id ? INTEL_ADDR_EXT(msi) : INTEL_ADDR(msi);
	*data = INTEL_DATA(msi);
	error = 0;
	}