From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from m16.mail.163.com (m16.mail.163.com [117.135.210.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7A7EB3A9639 for ; Mon, 10 Aug 2026 15:18:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=117.135.210.5 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786375125; cv=none; b=Jtv0SlmeqMu6l7Z94odT77MhfQcl8ojQ24WBgVOxiO0pRW/bs4QiiCdr64ZdrzbTB9BDxW8+ZrFIEic2p/xUMTwrfUA87OEgBqf5rnzNbnsHrEG3P+97gc/WZer9ByVnNjai/eyBXHjLMepUmRqSqk3n+ekzHzEdtOuA1VsD7YM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786375125; c=relaxed/simple; bh=plaso9psqK0+k1Ga3BN7NauBow/911i3F/L2DYtOlAw=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition:In-Reply-To; b=n80+hkJklLF/XwuRIf5jspuUY7RCTJxVV77fJPczD15YS4btNx1/AMZtBVD9D7+rZ0MBIjq9X87C6sS/fZORUyUphaoYIlhESfaze8bvaF6q6cj3N78GN+NCVK3sAvi2t6n/zWofCIESugGtlgx5rFBXlSiM6/+ubnxKd9LHf6E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=eTFXJ1LH; arc=none smtp.client-ip=117.135.210.5 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="eTFXJ1LH" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=Date:From:To:Subject:Message-ID:MIME-Version: Content-Type; bh=rhmk74NoGX0rjcG+7snUa3STz7lzqxTtPbndz82Ntww=; b=eTFXJ1LHqeE0C0pL5w2wT/P4LjikyCmJeK9th5yaZwb6VkOI7OnWAqKNC0eYJq kqTQlS5s+gpIwcvoF63fi+qDoTPQGgyhT+Ndr/iSJE4yUi4tk8UADjmRLV3eQvQf xbUdWwqmUo5gNhzeP/JqrzZn59UVOod7OA3NzaXDq2MmA= Received: from localhost (unknown []) by gzsmtp2 (Coremail) with SMTP id PSgvCgAnV_2Y63lqUGK0Kg--.17S2; Mon, 10 Aug 2026 23:17:44 +0800 (CST) Date: Mon, 10 Aug 2026 23:17:43 +0800 From: Hao Zhang To: "seanjc@google.com" Cc: "kvm@vger.kernel.org" , "pbonzini@redhat.com" , "Huang, Kai" Subject: [PATCH v3 2/3] KVM: selftests: Verify failed IOAPIC delivery preserves state Message-ID: Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-CM-TRANSID:PSgvCgAnV_2Y63lqUGK0Kg--.17S2 X-Coremail-Antispam: 1Uf129KBjvJXoWxXw47Xry8JFWDtFyUtrWDArb_yoWrAr4Dp3 4kC340vr4rGFyxKF1rJF1DWr15uFyqkay8Cw10gry8JFyrJ397AFs2qFW8Za4Ygw48Kws3 Za4rX345uw4UAaDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0zRFPfLUUUUU= X-CM-SenderInfo: pkdrs65kdqwshngh4qqrwthudrp/xtbC3hgaDWp565gjAQAA3T From: Hao Zhang Add an x86 selftest for the in-kernel I/O APIC state that is exposed through KVM_GET_IRQCHIP. Create a VM with an in-kernel irqchip and no vCPUs, route an unmasked level-triggered I/O APIC pin to a non-existent APIC ID, and verify that failed delivery does not set remote_irr. Signed-off-by: Hao Zhang --- tools/testing/selftests/kvm/Makefile.kvm | 1 + .../testing/selftests/kvm/x86/ioapic_state_test.c | 92 ++++++++++++++++++++++ 2 files changed, 93 insertions(+) create mode 100644 tools/testing/selftests/kvm/x86/ioapic_state_test.c diff --git a/tools/testing/selftests/kvm/Makefile.kvm b/tools/testing/selftests/kvm/Makefile.kvm index 6fc34e9bf8e1..89e3f82e75b0 100644 --- a/tools/testing/selftests/kvm/Makefile.kvm +++ b/tools/testing/selftests/kvm/Makefile.kvm @@ -86,6 +86,7 @@ TEST_GEN_PROGS_x86 += x86/hyperv_features TEST_GEN_PROGS_x86 += x86/hyperv_ipi TEST_GEN_PROGS_x86 += x86/hyperv_svm_test TEST_GEN_PROGS_x86 += x86/hyperv_tlb_flush +TEST_GEN_PROGS_x86 += x86/ioapic_state_test TEST_GEN_PROGS_x86 += x86/kvm_clock_test TEST_GEN_PROGS_x86 += x86/kvm_pv_test TEST_GEN_PROGS_x86 += x86/kvm_buslock_test diff --git a/tools/testing/selftests/kvm/x86/ioapic_state_test.c b/tools/testing/selftests/kvm/x86/ioapic_state_test.c new file mode 100644 index 000000000000..be5237f34ad2 --- /dev/null +++ b/tools/testing/selftests/kvm/x86/ioapic_state_test.c @@ -0,0 +1,92 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Regression tests for in-kernel I/O APIC state. + */ + +#include "kvm_util.h" +#include "test_util.h" + +#define TEST_IOAPIC_PIN 16 +#define TEST_VECTOR 0x50 +#define NO_SUCH_APIC_ID 0xfe +#define TEST_IOAPIC_EDGE_TRIG 0 +#define TEST_IOAPIC_LEVEL_TRIG 1 + +static void get_ioapic(struct kvm_vm *vm, struct kvm_irqchip *irqchip) +{ + int r; + + irqchip->chip_id = KVM_IRQCHIP_IOAPIC; + r = __vm_ioctl(vm, KVM_GET_IRQCHIP, irqchip); + if (r && errno == ENXIO) + __TEST_REQUIRE(0, "In-kernel I/O APIC not available"); + + TEST_ASSERT(!r, KVM_IOCTL_ERROR(KVM_GET_IRQCHIP, r)); +} + +static void set_ioapic(struct kvm_vm *vm, struct kvm_irqchip *irqchip) +{ + irqchip->chip_id = KVM_IRQCHIP_IOAPIC; + vm_ioctl(vm, KVM_SET_IRQCHIP, irqchip); +} + +static void set_ioapic_entry(struct kvm_vm *vm, bool level_triggered, + u32 dest_id) +{ + struct kvm_irqchip irqchip; + + get_ioapic(vm, &irqchip); + + irqchip.chip.ioapic.redirtbl[TEST_IOAPIC_PIN].fields.vector = + TEST_VECTOR; + irqchip.chip.ioapic.redirtbl[TEST_IOAPIC_PIN].fields.dest_id = + dest_id; + irqchip.chip.ioapic.redirtbl[TEST_IOAPIC_PIN].fields.dest_mode = 0; + irqchip.chip.ioapic.redirtbl[TEST_IOAPIC_PIN].fields.trig_mode = + level_triggered ? TEST_IOAPIC_LEVEL_TRIG : + TEST_IOAPIC_EDGE_TRIG; + irqchip.chip.ioapic.redirtbl[TEST_IOAPIC_PIN].fields.mask = 0; + irqchip.chip.ioapic.redirtbl[TEST_IOAPIC_PIN].fields.remote_irr = 0; + + set_ioapic(vm, &irqchip); +} + +static int kvm_irq_line_status(struct kvm_vm *vm, int level) +{ + struct kvm_irq_level irq = { + .irq = TEST_IOAPIC_PIN, + .level = level, + }; + + vm_ioctl(vm, KVM_IRQ_LINE_STATUS, &irq); + return irq.status; +} + +static void test_no_remote_irr_for_undelivered_level_interrupt(void) +{ + struct kvm_irqchip irqchip; + struct kvm_vm *vm; + int status; + + vm = vm_create_barebones(); + vm_create_irqchip(vm); + + set_ioapic_entry(vm, true, NO_SUCH_APIC_ID); + + status = kvm_irq_line_status(vm, 1); + TEST_ASSERT(status == -1, + "Expected failed interrupt delivery, got %d", status); + + get_ioapic(vm, &irqchip); + TEST_ASSERT(!irqchip.chip.ioapic.redirtbl[TEST_IOAPIC_PIN].fields.remote_irr, + "KVM set remote_irr for a level-triggered interrupt that wasn't delivered"); + + kvm_vm_free(vm); +} + +int main(void) +{ + test_no_remote_irr_for_undelivered_level_interrupt(); + + return 0; +} -- 2.15.0