Date: Sat, 28 Mar 2026 05:56:34 +0000 From: Colin Percival <cperciva@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 9b18ba2c16a0 - main - Xen: Detect Extended Destination ID support Message-ID: <69c76d92.3ffe5.4c948c4c@gitrepo.freebsd.org>
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The branch main has been updated by cperciva: URL: https://cgit.FreeBSD.org/src/commit/?id=9b18ba2c16a0750e6c78f348845368284ef1a704 commit 9b18ba2c16a0750e6c78f348845368284ef1a704 Author: Colin Percival <cperciva@FreeBSD.org> AuthorDate: 2026-02-22 04:09:00 +0000 Commit: Colin Percival <cperciva@FreeBSD.org> CommitDate: 2026-03-28 05:54:48 +0000 Xen: Detect Extended Destination ID support Xen advertises support for the Extended Destination ID standard via bit 5 (aka XEN_HVM_CPUID_EXT_DEST_ID) of the value returned in the EAX register when Xen features are queried via CPUID. MFC after: 3 weeks Sponsored by: Amazon Differential Revision: https://reviews.freebsd.org/D55429 --- sys/x86/x86/local_apic.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/sys/x86/x86/local_apic.c b/sys/x86/x86/local_apic.c index fb3b93e4164f..accdf853a174 100644 --- a/sys/x86/x86/local_apic.c +++ b/sys/x86/x86/local_apic.c @@ -73,6 +73,7 @@ #include <machine/specialreg.h> #include <x86/init.h> #include <x86/kvm.h> +#include <contrib/xen/arch-x86/cpuid.h> #ifdef DDB #include <sys/interrupt.h> @@ -2100,6 +2101,11 @@ detect_extended_dest_id(void) /* Check if we support extended destination IDs. */ switch (vm_guest) { + case VM_GUEST_XEN: + cpuid_count(hv_base + 4, 0, regs); + if (regs[0] & XEN_HVM_CPUID_EXT_DEST_ID) + apic_ext_dest_id = 1; + break; case VM_GUEST_KVM: kvm_cpuid_get_features(regs); if (regs[0] & KVM_FEATURE_MSI_EXT_DEST_ID)home | help
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