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/qemu/docs/system/i386/
H A Dkvm-pv.rst1 Paravirtualized KVM features
5 -----------
7 In some cases when implementing hardware interfaces in software is slow, ``KVM``
11 -----
13 Paravirtualized ``KVM`` features are represented as CPU flags. The following
14 features are enabled by default for any CPU model when ``KVM`` acceleration is
17 - ``kvmclock``
18 - ``kvm-nopiodelay``
19 - ``kvm-asyncpf``
20 - ``kvm-steal-time``
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H A Dhyperv.rst1 Hyper-V Enlightenments
6 -----------
8 In some cases when implementing a hardware interface in software is slow, KVM
11 It may, however, be hard-to-impossible to add support for these interfaces to
14 KVM on x86 implements Hyper-V Enlightenments for Windows guests. These features
15 make Windows and Hyper-V guests think they're running on top of a Hyper-V
16 compatible hypervisor and use Hyper-V specific features.
20 -----
22 No Hyper-V enlightenments are enabled by default by either KVM or QEMU. In
25 .. parsed-literal::
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H A Dxen.rst6 -----------
8 KVM has support for hosting Xen guests, intercepting Xen hypercalls and event
10 run under Xen to be hosted in QEMU under Linux/KVM instead.
15 -----
17 Xen mode is enabled by setting the ``xen-version`` property of the KVM
20 .. parsed-literal::
22 |qemu_system| --accel kvm,xen-version=0x40011,kernel-irqchip=split
25 ``xen-vapic`` CPU flag:
27 .. parsed-literal::
29 |qemu_system| --accel kvm,xen-version=0x40011,kernel-irqchip=split --cpu host,+xen-vapic
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H A Dtdx.rst5 Virtual Machine Extensions (VMX) and Multi-Key Total Memory Encryption (MKTME)
12 -------------
15 while KVM hypervisor has TDX support and has TDX enabled. If those requirements
25 KVM vcpu ioctl ``KVM_TDX_INIT_MEM_REGION`` can be used to populate the TDVF
29 device and it actually works as RAM. "-bios" option is chosen to load TDVF.
32 command line to specify and load TDVF is ``-bios OVMF.fd``
35 ---------------------
37 Unlike non-TDX VM, the CPU features (enumerated by CPU or MSR) of a TD are not
43 - Attributes:
44 - PKS (bit 30) controls whether Supervisor Protection Keys is exposed to TD,
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/qemu/docs/specs/
H A Dppc-spapr-xive.rst13 - *Legacy Compatibility Mode*
20 - *XIVE native exploitation mode*
34 ---------------
37 property ``ibm,arch-vec-5-platform-support`` in byte 23 and the OS
38 Selection for XIVE is indicated in the ``ibm,architecture-vec-5``
43 ``ic-mode`` which can be set on the command line. It can take the
52 KVM negotiation
53 ---------------
55 When the guest starts under KVM, the capabilities of the host kernel
57 kernel, KVM will advertise the XIVE capability to QEMU or not.
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H A Driscv-aia.rst1 .. _riscv-aia:
3 RISC-V AIA support for RISC-V machines
7 RISC-V machine for TCG and KVM accelerators.
11 - "aia=aplic": adds one or more APLIC (Advanced Platform Level Interrupt Controller)
13 - "aia=aplic-imsic": adds one or more APLIC device and an IMSIC (Incoming MSI
18 emulated in userspace versus what is being emulated by an in-kernel irqchip.
21 (m-mode) APLIC and IMSIC (when applicable).
23 When running KVM:
25 - no m-mode is provided, so there is no m-mode APLIC or IMSIC emulation regardless of
27 - with "aia=aplic", s-mode APLIC will be emulated by userspace
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/qemu/target/arm/
H A Dkvm_arm.h2 * QEMU KVM support -- ARM specific functions.
7 * See the COPYING file in the top-level directory.
14 #include "system/kvm.h"
15 #include "target/arm/cpu-qom.h"
23 * @devid: the KVM device ID
31 * @devid should be the ID of the device as defined by the arm-vgic device
46 * This updates KVM's working data structures from TCG data or
52 * Note that we do not stop early on failure -- we will attempt
63 * copy info from KVM's working data structures into TCG or
68 * Note that we do not stop early on failure -- we will attempt
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H A Dkvm.c2 * ARM implementation of KVM hooks
4 * Copyright Christoffer Dall 2009-2010
5 * Copyright Mian-M. Hamayun 2013, Virtual Open Systems
9 * See the COPYING file in the top-level directory.
16 #include <linux/kvm.h>
19 #include "qemu/error-report.h"
20 #include "qemu/main-loop.h"
25 #include "system/kvm.h"
33 #include "system/address-spaces.h"
80 init.target = cpu->kvm_target; in kvm_arm_vcpu_init()
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/qemu/docs/system/arm/
H A Dcpu-features.rst10 Cortex-A15 and the Cortex-A57, which respectively implement Arm
11 architecture reference manuals ARMv7-A and ARMv8-A, may both optionally
12 implement PMUs. For example, if a user wants to use a Cortex-A15 without
13 a PMU, then the ``-cpu`` parameter should contain ``pmu=off`` on the QEMU
14 command line, i.e. ``-cpu cortex-a15,pmu=off``.
18 that implement the ARMv8-A architecture reference manual may optionally
20 ``aarch64`` CPU property. A CPU type such as the Cortex-A15, which does
21 not implement ARMv8-A, will not have the ``aarch64`` CPU property.
27 when using the KVM accelerator and when running on a host CPU type that
28 supports the feature. While ``aarch64`` currently only works with KVM,
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/qemu/include/system/
H A Dkvm.h2 * QEMU KVM support
10 * See the COPYING file in the top-level directory.
14 /* header to be included in non-KVM-specific code */
25 # include <linux/kvm.h>
51 * Returns: true if an in-kernel irqchip was created.
55 * target-independent code: use one of the following functions or
73 * Returns: true if we can deliver interrupts to KVM
92 * a KVM CPU (ie the kernel supports irqfds and we are running
95 * Always available if running with in-kernel irqchip.
103 * a KVM CPU (ie the kernel supports resamplefds and we are running
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/qemu/docs/system/ppc/
H A Dpseries.rst5 The Power machine para-virtualized environment described by the Linux on Power
18 - POWER7, POWER7+
19 - POWER8, POWER8NVL
20 - POWER9
21 - Power10
22 - Power11
23 - Support for POWER5+ also exists, works with correct kernel/userspace
25 - XICS (POWER8)
26 - XIVE (Supported by below:)
27 - POWER9
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H A Dpowernv.rst4 PowerNV (as Non-Virtualized) is the "bare metal" platform using the
6 be used as an hypervisor OS, running KVM guests, or simply as a host
16 -----------------
24 * Simple OCC is an on-chip micro-controller used for power management tasks.
30 ---------------
44 --------
49 GitHub <https://github.com/open-power>`_.
52 `OpenPOWER <https://github.com/open-power/op-build/releases/>`__ site.
58 ---------------------------
60 KVM acceleration in Linux Power hosts is provided by the kvm-hv and
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/qemu/docs/devel/
H A Dmulti-process.rst1 Multi-process QEMU
6 This is the design document for multi-process QEMU. It does not
31 -------------
34 VM control point, where VMs can be created, migrated, re-configured, and
40 A multi-process QEMU
43 A multi-process QEMU involves separating QEMU services into separate
51 A QEMU control process would remain, but in multi-process mode, will
53 provide the user interface to hot-plug devices or live migrate the VM.
55 A first step in creating a multi-process QEMU is to separate IO services
62 ----------------------
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/qemu/hw/intc/
H A Dspapr_xive_kvm.c4 * Copyright (c) 2017-2019, IBM Corporation.
7 * COPYING file in the top-level directory.
12 #include "qemu/error-report.h"
16 #include "system/kvm.h"
46 if (enabled_cpu->vcpu_id == vcpu_id) { in kvm_cpu_is_enabled()
59 enabled_cpu->vcpu_id = vcpu_id; in kvm_cpu_enable()
74 * XIVE Thread Interrupt Management context (KVM)
79 SpaprXive *xive = SPAPR_XIVE(tctx->xptr); in kvmppc_xive_cpu_set_state()
83 assert(xive->fd != -1); in kvmppc_xive_cpu_set_state()
86 state[0] = *((uint64_t *) &tctx->regs[TM_QW1_OS]); in kvmppc_xive_cpu_set_state()
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H A Dxics_kvm.c4 * PAPR Virtualized Interrupt System, aka ICS/ICP aka xics, in-kernel emulation
31 #include "system/kvm.h"
37 #include "qemu/config-file.h"
38 #include "qemu/error-report.h"
42 static int kernel_xics_fd = -1;
63 * ICP-KVM
70 /* The KVM XICS device is not in use */ in icp_get_kvm_state()
71 if (kernel_xics_fd == -1) { in icp_get_kvm_state()
76 if (!icp->cs) { in icp_get_kvm_state()
80 ret = kvm_get_one_reg(icp->cs, KVM_REG_PPC_ICP_STATE, &state); in icp_get_kvm_state()
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/qemu/target/i386/kvm/
H A Dkvm-cpu.c2 * x86 KVM CPU type initialization
7 * See the COPYING file in the top-level directory.
12 #include "host-cpu.h"
18 #include "accel/accel-cpu-target.h"
25 eax = kvm_arch_get_supported_cpuid(cs->kvm_state, 0x80000008, 0, R_EAX); in kvm_set_guest_phys_bits()
30 cpu->guest_phys_bits = guest_phys_bits; in kvm_set_guest_phys_bits()
31 if (cpu->guest_phys_bits > cpu->phys_bits) { in kvm_set_guest_phys_bits()
32 cpu->guest_phys_bits = cpu->phys_bits; in kvm_set_guest_phys_bits()
35 if (cpu->host_phys_bits && cpu->host_phys_bits_limit && in kvm_set_guest_phys_bits()
36 cpu->guest_phys_bits > cpu->host_phys_bits_limit) { in kvm_set_guest_phys_bits()
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/qemu/hw/vfio/
H A Dhelpers.c11 * the COPYING file in the top-level directory.
13 * Based on qemu-kvm device-assignment:
14 * Adapted for KVM by Qumranet.
19 * Copyright (C) 2008, IBM, Muli Ben-Yehuda (muli@il.ibm.com)
25 #include "system/kvm.h"
26 #include "hw/vfio/vfio-device.h"
29 #include "vfio-helpers.h"
33 vbmap->pages = REAL_HOST_PAGE_ALIGN(size) / qemu_real_host_page_size(); in vfio_bitmap_alloc()
34 vbmap->size = ROUND_UP(vbmap->pages, sizeof(__u64) * BITS_PER_BYTE) / in vfio_bitmap_alloc()
36 vbmap->bitmap = g_try_malloc0(vbmap->size); in vfio_bitmap_alloc()
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/qemu/tests/qtest/
H A Darm-cpu-features.c9 * See the COPYING file in the top-level directory.
18 * We expect the SVE max-vq to be 16. Also it must be <= 64
23 #define MACHINE "-machine virt,gic-version=max -accel tcg "
24 #define MACHINE_KVM "-machine virt,gic-version=max -accel kvm "
25 #define QUERY_HEAD "{ 'execute': 'query-cpu-model-expansion', " \
191 resp = qtest_qmp(qts, "{ 'execute': 'query-cpu-model-expansion', " in assert_type_full()
207 resp = qtest_qmp(qts, "{ 'execute': 'query-cpu-model-expansion', " in assert_bad_props()
234 if (strlen(e->key) > 3 && !strncmp(e->key, "sve", 3) && in resp_get_sve_vls()
235 g_ascii_isdigit(e->key[3])) { in resp_get_sve_vls()
239 bits = g_ascii_strtoll(&e->key[3], &endptr, 10); in resp_get_sve_vls()
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/qemu/.gitlab-ci.d/
H A Dcrossbuilds.yml2 - local: '/.gitlab-ci.d/crossbuild-template.yml'
4 cross-armhf-user:
7 job: armhf-debian-cross-container
9 IMAGE: debian-armhf-cross
11 cross-arm64-system:
14 job: arm64-debian-cross-container
16 IMAGE: debian-arm64-cross
18 cross-arm64-user:
21 job: arm64-debian-cross-container
23 IMAGE: debian-arm64-cross
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/qemu/scripts/kvm/
H A Dkvm_flightrecorder3 # KVM Flight Recorder - ring buffer tracing script
9 # This script provides a command-line interface to kvm ftrace and is designed
10 # to be used as a flight recorder that is always running. To start in-memory
13 # sudo kvm_flightrecorder start 8192 # 8 MB per-cpu ring buffers
15 # The per-cpu ring buffer size can be given in KB as an optional argument to
33 # fixed-size in-memory trace.
53 enable_subsystem('kvm', True)
58 enable_subsystem('kvm', False)
81 print('Control the KVM flight recorder tracing.')
89 if cmd == '--version':
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/qemu/target/s390x/kvm/
H A Dtrace-events3 # kvm.c
6 …_index, uint8_t state, const char *msg) "Warning: Unable to set cpu %d state %" PRIu8 " to KVM: %s"
9 kvm_sw_breakpoint(uint32_t n) "KVM: will use %d-byte sw breakpoints"
10 kvm_insn_unhandled_priv(uint32_t x) "KVM: unhandled PRIV: 0x%x"
11 kvm_insn_diag(uint32_t x) "KVM: unknown DIAG: 0x%x"
/qemu/accel/kvm/
H A Dkvm-accel-ops.c2 * QEMU KVM support
12 * See the COPYING file in the top-level directory.
17 #include "qemu/error-report.h"
18 #include "qemu/main-loop.h"
19 #include "system/accel-ops.h"
20 #include "system/kvm.h"
24 #include "qemu/guest-random.h"
27 #include <linux/kvm.h>
28 #include "kvm-cpus.h"
38 qemu_thread_get_self(cpu->thread); in kvm_vcpu_thread_fn()
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/qemu/target/riscv/kvm/
H A Dkvm-cpu.c2 * RISC-V implementation of KVM hooks
23 #include <linux/kvm.h>
27 #include "qemu/error-report.h"
28 #include "qemu/main-loop.h"
31 #include "system/kvm.h"
35 #include "accel/accel-cpu-target.h"
38 #include "system/address-spaces.h"
46 #include "chardev/char-fe.h"
89 size_b = cpu->cfg.vlenb; in kvm_riscv_vector_reg_id()
146 /* KVM ISA extensions */
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/qemu/python/qemu/utils/
H A Daccel.py7 # Copyright (C) 2015-2016 Red Hat Inc.
14 # the COPYING file in the top-level directory.
34 def list_accel(qemu_bin: str) -> List[str]:
39 @raise Exception: if failed to run ``qemu -accel help``
45 out = subprocess.check_output([qemu_bin, '-accel', 'help'],
55 qemu_bin: Optional[str] = None) -> bool:
57 Check if KVM is available using the following heuristic:
58 - Kernel module is present in the host;
59 - Target and host arches don't mismatch;
60 - KVM is enabled in the QEMU binary.
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/qemu/hw/s390x/
H A Ds390-pci-kvm.c2 * s390 zPCI KVM interfaces
8 * your option) any later version. See the COPYING file in the top-level
14 #include <linux/kvm.h>
16 #include "kvm/kvm_s390x.h"
17 #include "target/s390x/kvm/pv.h"
18 #include "hw/s390x/s390-pci-bus.h"
19 #include "hw/s390x/s390-pci-kvm.h"
20 #include "hw/s390x/s390-pci-inst.h"
21 #include "hw/s390x/s390-pci-vfio.h"
33 .fh = pbdev->fh, in s390_pci_kvm_aif_enable()
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