git: 2b82661c9792 - stable/14 - Bhyve: Detect Extended Destination ID support

The branch stable/14 has been updated by cperciva:

URL: https://cgit.FreeBSD.org/src/commit/?id=2b82661c9792949c9cdcc32587e0e1ad37776d48

commit 2b82661c9792949c9cdcc32587e0e1ad37776d48
Author:     Colin Percival <cperciva@FreeBSD.org>
AuthorDate: 2026-02-22 04:09:00 +0000
Commit:     Colin Percival <cperciva@FreeBSD.org>
CommitDate: 2026-04-16 15:11:55 +0000

    Bhyve: Detect Extended Destination ID support
    
    Bhyve advertises support for the Extended Destination ID standard via
    bit 0 (aka CPUID_BHYVE_FEAT_EXT_DEST_ID) of the value returned in the
    EAX register when Bhyve features are queried via CPUID.
    
    MFC after:      3 weeks
    Sponsored by:   Amazon
    Differential Revision:  https://reviews.freebsd.org/D55431
    
    (cherry picked from commit 8dd9a0d52175fbc5dafed851fb95a289a94fb6cd)
---
 sys/x86/x86/local_apic.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sys/x86/x86/local_apic.c b/sys/x86/x86/local_apic.c
index d073dcd1c98a..4330d0108af6 100644
--- a/sys/x86/x86/local_apic.c
+++ b/sys/x86/x86/local_apic.c
@@ -74,6 +74,7 @@
 #include <x86/init.h>
 #include <x86/kvm.h>
 #include <contrib/xen/arch-x86/cpuid.h>
+#include <x86/bhyve.h>
 
 #ifdef DDB
 #include <sys/interrupt.h>
@@ -1950,6 +1951,13 @@ detect_extended_dest_id(void)
 		if (regs[0] & KVM_FEATURE_MSI_EXT_DEST_ID)
 			apic_ext_dest_id = 1;
 		break;
+	case VM_GUEST_BHYVE:
+		if (hv_high < CPUID_BHYVE_FEATURES)
+			break;
+		cpuid_count(CPUID_BHYVE_FEATURES, 0, regs);
+		if (regs[0] & CPUID_BHYVE_FEAT_EXT_DEST_ID)
+			apic_ext_dest_id = 1;
+		break;
 	}
 }