From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f201.google.com (mail-pg1-f201.google.com [209.85.215.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E04CB2F7F07 for ; Thu, 4 Jun 2026 02:02:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780538560; cv=none; b=icOzUVMiBH25VHAzGNOaa+9s66FH5ihj01NV9guNhEgDSV1Ay6Zu2UVteWRK0xrYUyDz/1XfyrslOh8RgXyznsY1Cup3yf4bG/gkVhJ+RYQXHXfUFb0QZTDLTWceMns8jYMNXVoSmZ25KX+Av3SaI9NvG7eHYD1IuYmymYFqYs8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780538560; c=relaxed/simple; bh=zrNl+JH8vjU7uSPg+JCRyB18yy5SlEyRLk6yM7c1Wvg=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=PA2i4wmGBcjuCERcnIsCgddyZhYk/WJkQrw8wOKLq68oprD86bjeKNylbzsoZCJAAUWBhlMeR+omv6bNvF0H1by9BGkqt+31y/ehL6hrDM+V9VlD1kAD5CpbBWrzVD3sJh109M43Q0fGX+P7wdPyAKc9X45Ad7S2Jli+qkzR+rU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--jrhilke.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=v/VxyUo2; arc=none smtp.client-ip=209.85.215.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--jrhilke.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="v/VxyUo2" Received: by mail-pg1-f201.google.com with SMTP id 41be03b00d2f7-c856470fe9fso151164a12.2 for ; Wed, 03 Jun 2026 19:02:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1780538557; x=1781143357; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=IXCqa1BPoqbMNgkQEA2NIjwyLKz0tdvhhBmIxPnEIvI=; b=v/VxyUo29SSiq2zFFq/VsOunEQlKDLA6r763+TMMy3gqDmf1xgJE6eyyWvaY7SqdO0 KJjJSH6+vj2KlMjkZng2gnpYUoU6OI8d37xvre6T6SK60VL+Y/CQlEfmnsn28LK5aO2o 8XW+IKpLtt69w2/xrvqHcPR5vZdtwqnRiYf8k7c+lvOhdEwb0kk76FwVD/jqX2NTRK// 4FHSwiYey2QZhPHwwn5jm6OnlKIGvfpLMHTRAXRtMNtdTSiCS1vb/Bg3oVlQpedZhWXz Y6xvnU/sTIoqKUGYRYUDgun5dji8fvyri7qNYjEayYsR7cCpcMfEsOz2ski8wQ6W/pFU PYHw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1780538557; x=1781143357; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=IXCqa1BPoqbMNgkQEA2NIjwyLKz0tdvhhBmIxPnEIvI=; b=R3KS+qGyXBsE3I1BjhipvsHy6vEFwqCRp7/w7J+1vsc10C/1wJIz+3Y9qwPFocqaYo L571vH4KHrGyaBByVF7TBR0RA2gRDUvFSa1szkpq0mKBiELZWQs5BLf+m1pXvXR7KBKi 20GIHlVaax2irNNt2Uu+p/dMZMAXRb7wv9rw0y07y8rWh5JFfNLnQX6JAYYTf+vKPEF5 34Tc2seIniULwzkZor5/aOGkFccdXh2sQ2XKCbHMjhXMFkNfxhUySnb/PKKavRxYYsuN cEOcJMp6Tpt61O95s1NXztZVNbgp5Q4TM+kPTh4j8+nU8ywEXewkoa2pC+8VI07UP1w/ GLNQ== X-Forwarded-Encrypted: i=1; AFNElJ9KiEEsL3Q70j83QEkkTm0rdAVsKAd/0crs6WXHNP8vfTSMJYY3wLZ3UIo1uJedFd4N8wzJ5HErW+kICX8=@vger.kernel.org X-Gm-Message-State: AOJu0YzANe9XV6+L4PL+6FuI0RB1JMRjhCaf4IOwZVWvhWwSq/AH/03L nhN8T9CT5/K9BNvYa+zrLmQgPf/opSCNviAulOVhUobCa5FmENxweTooHJYUagaOjQKJ0O3rAkh BpRB9MWSh X-Received: from pgar22.prod.google.com ([2002:a05:6a02:2e96:b0:c85:b75b:a85d]) (user=jrhilke job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a21:7314:b0:3a3:171f:6aff with SMTP id adf61e73a8af0-3b497348e84mr6333680637.2.1780538556829; Wed, 03 Jun 2026 19:02:36 -0700 (PDT) Date: Thu, 4 Jun 2026 02:01:29 +0000 In-Reply-To: <20260604020143.748245-1-jrhilke@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260604020143.748245-1-jrhilke@google.com> X-Mailer: git-send-email 2.54.0.1032.g2f8565e1d1-goog Message-ID: <20260604020143.748245-8-jrhilke@google.com> Subject: [PATCH v5 07/21] KVM: selftests: Verify IRQ bypass works in IRQ test From: Josh Hilke To: Paolo Bonzini , Sean Christopherson Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, David Matlack , Alex Williamson , Josh Hilke Content-Type: text/plain; charset="UTF-8" From: David Matlack Trigger interrupts from a VFIO device instead of emulating interrupts using KVM eventfds. This verifies that guests receive interrupts via IRQ bypass. Add a '-d' argument to tools/testing/selftests/kvm/irq_test which takes the segment:bus:device.function number of a PCI device bound to VFIO which will trigger interrupts. The device must have a VFIO selftest driver in order to work with the test. Example: $ ./tools/testing/selftests/kvm/irq_test -d 0000:06:0a.1 Co-developed-by: Josh Hilke Signed-off-by: Josh Hilke Signed-off-by: David Matlack --- tools/testing/selftests/kvm/irq_test.c | 64 +++++++++++++++++++++++--- 1 file changed, 57 insertions(+), 7 deletions(-) diff --git a/tools/testing/selftests/kvm/irq_test.c b/tools/testing/selftests/kvm/irq_test.c index d3fee51cf451..5b42d8abd1ea 100644 --- a/tools/testing/selftests/kvm/irq_test.c +++ b/tools/testing/selftests/kvm/irq_test.c @@ -1,14 +1,17 @@ // SPDX-License-Identifier: GPL-2.0 #include "kvm_util.h" #include "test_util.h" +#include #include "apic.h" #include "processor.h" +#include "proc_util.h" #include #include #include #include #include +#include static u64 timeout_ns = 2ULL * 1000 * 1000 * 1000; static bool guest_ready_for_irqs[KVM_MAX_VCPUS]; @@ -55,6 +58,36 @@ static void *vcpu_thread_main(void *arg) return NULL; } +static int vfio_setup_msi(struct vfio_pci_device *device) +{ + const int flags = MAP_SHARED | MAP_ANONYMOUS; + const int prot = PROT_READ | PROT_WRITE; + struct dma_region *region; + + /* A driver is required to generate an MSI. */ + TEST_REQUIRE(device->driver.ops); + + /* Set up a DMA-able region for the driver to use. */ + region = &device->driver.region; + region->iova = 0; + region->size = SZ_2M; + region->vaddr = kvm_mmap(region->size, prot, flags, -1); + TEST_ASSERT(region->vaddr != MAP_FAILED, "mmap() failed\n"); + iommu_map(device->iommu, region); + + vfio_pci_driver_init(device); + return device->driver.msi; +} + +static void trigger_interrupt(struct vfio_pci_device *device, int eventfd) +{ + if (device) + vfio_pci_driver_send_msi(device); + else + eventfd_write(eventfd, 1); +} + + static void kvm_route_msi(struct kvm_vm *vm, u32 gsi, struct kvm_vcpu *vcpu, u8 vector) { @@ -76,9 +109,10 @@ static void kvm_route_msi(struct kvm_vm *vm, u32 gsi, struct kvm_vcpu *vcpu, static void help(const char *name) { - printf("Usage: %s [-h]\n", name); + printf("Usage: %s [-d ] [-h]\n", name); printf("\n"); printf("Tests KVM IRQ injection via irqfd using an emulated eventfd.\n"); + printf("-d Use a VFIO device to send MSI-X interrupts instead of using an emulated eventfd\n"); printf("\n"); exit(KSFT_FAIL); } @@ -100,14 +134,21 @@ int main(int argc, char **argv) u32 gsi = kvm_random_u64_in_range(&kvm_rng, 24, KVM_MAX_IRQ_ROUTES - 1); u8 vector = kvm_random_u64_in_range(&kvm_rng, 32, UINT8_MAX); - struct kvm_vcpu *vcpus[KVM_MAX_VCPUS]; pthread_t vcpu_threads[KVM_MAX_VCPUS]; + struct kvm_vcpu *vcpus[KVM_MAX_VCPUS]; + struct vfio_pci_device *device = NULL; int nr_irqs = 1000, nr_vcpus = 1; - int i, j, c, eventfd; + const char *device_bdf = NULL; + int i, j, c, msix, eventfd; + struct iommu *iommu; struct kvm_vm *vm; + unsigned int irq; - while ((c = getopt(argc, argv, "h")) != -1) { + while ((c = getopt(argc, argv, "d:h")) != -1) { switch (c) { + case 'd': + device_bdf = optarg; + break; case 'h': default: help(argv[0]); @@ -119,7 +160,17 @@ int main(int argc, char **argv) vm = vm_create_with_vcpus(nr_vcpus, guest_code, vcpus); vm_install_exception_handler(vm, vector, guest_irq_handler); - eventfd = kvm_new_eventfd(); + if (device_bdf) { + iommu = iommu_init(default_iommu_mode); + device = vfio_pci_device_init(device_bdf, iommu); + msix = vfio_setup_msi(device); + irq = vfio_msix_to_host_irq(device_bdf, msix); + eventfd = device->msi_eventfds[msix]; + printf("Using device %s MSI-X[%d] (IRQ-%u)\n", device_bdf, msix, + irq); + } else { + eventfd = kvm_new_eventfd(); + } printf("Injecting interrupts for GSI %d (Vector 0x%x) %d times\n", gsi, vector, nr_irqs); @@ -147,8 +198,7 @@ int main(int argc, char **argv) "IRQ flag for vCPU %d not clear prior to test", vcpus[j]->id); - /* Trigger interrupt */ - eventfd_write(eventfd, 1); + trigger_interrupt(device, eventfd); clock_gettime(CLOCK_MONOTONIC, &start); for (;;) { -- 2.54.0.1032.g2f8565e1d1-goog