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Tsirkin" , Marcel Apfelbaum , Jason Wang , Marcelo Tosatti , Cleber Rosa , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Wainer dos Santos Moschetta , Beraldo Leal , qemu-block@nongnu.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org, Bernhard Beschow , Joel Upham Subject: [PATCH v2 09/24] i386/xen: advertise XEN_HVM_CPUID_UPCALL_VECTOR in CPUID Date: Thu, 19 Oct 2023 16:40:05 +0100 Message-Id: <20231019154020.99080-10-dwmw2@infradead.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20231019154020.99080-1-dwmw2@infradead.org> References: <20231019154020.99080-1-dwmw2@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Sender: David Woodhouse X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html X-ZohoMail-DKIM: pass (identity @infradead.org) X-ZM-MESSAGEID: 1697730109273100001 Content-Type: text/plain; charset="utf-8" From: David Woodhouse This will allow Linux guests (since v6.0) to use the per-vCPU upcall vector delivered as MSI through the local APIC. Signed-off-by: David Woodhouse --- target/i386/kvm/kvm.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index ab72bcdfad..bd774b3e02 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -1889,6 +1889,10 @@ int kvm_arch_init_vcpu(CPUState *cs) c->eax |=3D XEN_HVM_CPUID_VCPU_ID_PRESENT; c->ebx =3D cs->cpu_index; } + + if (cs->kvm_state->xen_version >=3D XEN_VERSION(4, 17)) { + c->eax |=3D XEN_HVM_CPUID_UPCALL_VECTOR; + } } =20 r =3D kvm_xen_init_vcpu(cs); --=20 2.40.1