* Deprecate 32-bit x86 and arm hosts for system emulation
* Check bison version to be >= 3.0
* Compile vnc test only if vnc is really enabled
* Check docs/config/ich9-ehci-uhci.cfg via the readconfig-test
* s390x: Add support for list-directed IPL from ECKD DASD
-----BEGIN PGP SIGNATURE-----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=p13b
-----END PGP SIGNATURE-----
Merge tag 'pull-request-2023-03-07' of https://gitlab.com/thuth/qemu into staging
* Refine the distro support policy
* Deprecate 32-bit x86 and arm hosts for system emulation
* Check bison version to be >= 3.0
* Compile vnc test only if vnc is really enabled
* Check docs/config/ich9-ehci-uhci.cfg via the readconfig-test
* s390x: Add support for list-directed IPL from ECKD DASD
# -----BEGIN PGP SIGNATURE-----
#
# iQJFBAABCAAvFiEEJ7iIR+7gJQEY8+q5LtnXdP5wLbUFAmQIQD0RHHRodXRoQHJl
# ZGhhdC5jb20ACgkQLtnXdP5wLbX+EA/5ATc/Rz9Y8TZF36/sUKrmjOxQnX91hgRW
# zovgZejoHtek1AC4pLd9kcpo1JonXkOfmbkNRYTw6+1wY6Ipt2apkWAc+MqfvQ80
# dGznbLXnX/E2QHW7h5XqvAhRGvjog9b38zAQcR37PKZ9DkSfWBwMgTT2SXYpLUjR
# YWgqPGBYRq1ViG4q7hv2dHqi/idzh+DOWFGU5NAQC1fEBOmPYN9u6vfbX86dwZsy
# S9pqw16yN2MZKL2bgIViFIjdhPPMO3RFcv8NTPipzk3g/pHNIv58+xCE8r/Tp8LW
# JRQzdh6JbGvj1BXH68igXWGUFW6dhOXZWhgmFe4QEDaiCj91pHGvQCYgo2agx2bl
# rXaSQXSMhIcm+t9C9kO6UNxZf+1HohcM1ZlQXhvX6FcBPVMUx/52YEpiK+OtBKyq
# 43AlKp4fp1xXLFSOyMNgSMR90sksng6CEoQqTr0jCZtF8H18wb+eHfb6dME3XRCw
# SKQeNGhkP1FxaQnlRAkeBxW7GkDE5YBjf9pSIaLZ/8VsLdyo3SK/DLkre5+qnu/V
# lksZlt1K7xDLxRFopBuVJ3MHeFSRazBDbWfrRFOALkdbGEEeZnnmEPFjD3mag+P4
# 1y9WmBJHRLlvhlm195WA8babenUZoOfLkPrL0k7mNLs9sZyx1eIkZfOUgCWjFE2V
# 9VBOWL8oi/w=
# =p13b
# -----END PGP SIGNATURE-----
# gpg: Signature made Wed 08 Mar 2023 07:58:53 GMT
# gpg: using RSA key 27B88847EEE0250118F3EAB92ED9D774FE702DB5
# gpg: issuer "thuth@redhat.com"
# gpg: Good signature from "Thomas Huth <th.huth@gmx.de>" [full]
# gpg: aka "Thomas Huth <thuth@redhat.com>" [full]
# gpg: aka "Thomas Huth <huth@tuxfamily.org>" [full]
# gpg: aka "Thomas Huth <th.huth@posteo.de>" [unknown]
# Primary key fingerprint: 27B8 8847 EEE0 2501 18F3 EAB9 2ED9 D774 FE70 2DB5
* tag 'pull-request-2023-03-07' of https://gitlab.com/thuth/qemu:
pc-bios/s390-ccw: Update s390-ccw.img with the list-directed IPL fix
pc-bios: Add support for List-Directed IPL from ECKD DASD
docs/config: Set the "kvm" accelerator via "[accel]" section
tests/qtest/readconfig: Test docs/config/ich9-ehci-uhci.cfg
tests/qtest/readconfig: Rework test_object_rng_resp into a generic function
gitlab-ci.d/crossbuilds: Drop the 32-bit arm system emulation jobs
docs/about/deprecated: Deprecate 32-bit arm hosts for system emulation
gitlab-ci.d/crossbuilds: Drop the i386 system emulation job
docs/about/deprecated: Deprecate 32-bit x86 hosts for system emulation
include/hw/i386: Clean up includes in x86.h
test: Check vnc enable before compiling vnc test
Hexagon (meson.build): define min bison version
docs/about/build-platforms: Refine the distro support policy
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This is phase 2, following on from the basic platform support which was
already merged.
• Add a simple single-tenant internal XenStore implementation
• Indirect Xen gnttab/evtchn/foreignmem/xenstore through operations table
• Provide emulated back ends for Xen operations
• Header cleanups to allow PV back ends to build without Xen itself
• Enable PV back ends in emulated mode
• Documentation update
Tested-by: Paul Durrant <paul@xen.org>
... on real Xen (master branch, 4.18) with a Debian guest.
-----BEGIN PGP SIGNATURE-----
iQJGBAABCgAwFiEEMUsIrNDeSBEzpfKGm+mA/QrAFUQFAmQHu3wSHGR3bXdAYW1h
em9uLmNvLnVrAAoJEJvpgP0KwBVE5LYP/0VodDsQdP7Z4L+/IzgBSgEec7qmyQFB
KlBZS/PmvCZKb0DHLI3GhXIyzD+/fnLtGSRl0rYObnKP7im+MpEDGmn97f6nIITk
AzkdsVhNEBQFXCkLgQ9y8kTrTmsod9O4sqn0+naa2TX4FPcRN0MaNmpuLEubvaRS
+JuyHmwy9ZeeAnsU31uJ0nx4F1hW9IDaatNoDeFcFnKCXQp36rtdZUViMowUJvwu
Q+Xyg6dybusznaoiXd485tTPrTt+FK/wEARse3q2gRh9QblLu0r5BFb0rOfhYCTQ
jw+5lBsOX+UlffmB9IDakRpVe4RKhvvRQSkRvYkPCshsqud9zMGhaquKg1vKBgca
I31XSN0LCcon/ahHGtmVAxyZUpWdEnfzO1TbTNpz9oacROklgVgEYdw5Vwca71VD
SURl6uCt9Jb9WmsR4twus4i4qDjQIDOtOF0hcxpl7HGktkxlGxUVI4qVLXARtVCS
OTB6N0LlhJ2woj2wYK5BRTiOj03T2MkJEWaYhDdIrQREKWe2Sn4xTOH5kGbQQnOr
km93odjBZFRHsAUnzXHXW3+yHjMefH7KrHePbmvsO4foGF77bBxosuC2ehFfvNJ0
VM/H04NDtPYCBwdAr545PSN/q+WzEPQaquLZ0UuTBuPpMMOYd+Ff8YvQWJPyCM18
1mq9v6Xe9RQZ
=JGLX
-----END PGP SIGNATURE-----
Merge tag 'xenfv-2' of git://git.infradead.org/users/dwmw2/qemu into staging
Enable PV backends with Xen/KVM emulation
This is phase 2, following on from the basic platform support which was
already merged.
• Add a simple single-tenant internal XenStore implementation
• Indirect Xen gnttab/evtchn/foreignmem/xenstore through operations table
• Provide emulated back ends for Xen operations
• Header cleanups to allow PV back ends to build without Xen itself
• Enable PV back ends in emulated mode
• Documentation update
Tested-by: Paul Durrant <paul@xen.org>
... on real Xen (master branch, 4.18) with a Debian guest.
# -----BEGIN PGP SIGNATURE-----
#
# iQJGBAABCgAwFiEEMUsIrNDeSBEzpfKGm+mA/QrAFUQFAmQHu3wSHGR3bXdAYW1h
# em9uLmNvLnVrAAoJEJvpgP0KwBVE5LYP/0VodDsQdP7Z4L+/IzgBSgEec7qmyQFB
# KlBZS/PmvCZKb0DHLI3GhXIyzD+/fnLtGSRl0rYObnKP7im+MpEDGmn97f6nIITk
# AzkdsVhNEBQFXCkLgQ9y8kTrTmsod9O4sqn0+naa2TX4FPcRN0MaNmpuLEubvaRS
# +JuyHmwy9ZeeAnsU31uJ0nx4F1hW9IDaatNoDeFcFnKCXQp36rtdZUViMowUJvwu
# Q+Xyg6dybusznaoiXd485tTPrTt+FK/wEARse3q2gRh9QblLu0r5BFb0rOfhYCTQ
# jw+5lBsOX+UlffmB9IDakRpVe4RKhvvRQSkRvYkPCshsqud9zMGhaquKg1vKBgca
# I31XSN0LCcon/ahHGtmVAxyZUpWdEnfzO1TbTNpz9oacROklgVgEYdw5Vwca71VD
# SURl6uCt9Jb9WmsR4twus4i4qDjQIDOtOF0hcxpl7HGktkxlGxUVI4qVLXARtVCS
# OTB6N0LlhJ2woj2wYK5BRTiOj03T2MkJEWaYhDdIrQREKWe2Sn4xTOH5kGbQQnOr
# km93odjBZFRHsAUnzXHXW3+yHjMefH7KrHePbmvsO4foGF77bBxosuC2ehFfvNJ0
# VM/H04NDtPYCBwdAr545PSN/q+WzEPQaquLZ0UuTBuPpMMOYd+Ff8YvQWJPyCM18
# 1mq9v6Xe9RQZ
# =JGLX
# -----END PGP SIGNATURE-----
# gpg: Signature made Tue 07 Mar 2023 22:32:28 GMT
# gpg: using RSA key 314B08ACD0DE481133A5F2869BE980FD0AC01544
# gpg: issuer "dwmw@amazon.co.uk"
# gpg: Good signature from "David Woodhouse <dwmw@amazon.co.uk>" [unknown]
# gpg: aka "David Woodhouse <dwmw@amazon.com>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg: There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 314B 08AC D0DE 4811 33A5 F286 9BE9 80FD 0AC0 1544
* tag 'xenfv-2' of git://git.infradead.org/users/dwmw2/qemu: (27 commits)
docs: Update Xen-on-KVM documentation for PV disk support
MAINTAINERS: Add entry for Xen on KVM emulation
i386/xen: Initialize Xen backends from pc_basic_device_init() for emulation
hw/xen: Implement soft reset for emulated gnttab
hw/xen: Map guest XENSTORE_PFN grant in emulated Xenstore
hw/xen: Add emulated implementation of XenStore operations
hw/xen: Add emulated implementation of grant table operations
hw/xen: Hook up emulated implementation for event channel operations
hw/xen: Only advertise ring-page-order for xen-block if gnttab supports it
hw/xen: Avoid crash when backend watch fires too early
hw/xen: Build PV backend drivers for CONFIG_XEN_BUS
hw/xen: Rename xen_common.h to xen_native.h
hw/xen: Use XEN_PAGE_SIZE in PV backend drivers
hw/xen: Move xenstore_store_pv_console_info to xen_console.c
hw/xen: Add xenstore operations to allow redirection to internal emulation
hw/xen: Add foreignmem operations to allow redirection to internal emulation
hw/xen: Pass grant ref to gnttab unmap operation
hw/xen: Add gnttab operations to allow redirection to internal emulation
hw/xen: Add evtchn operations to allow redirection to internal emulation
hw/xen: Create initial XenStore nodes
...
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
The CXL r3.0 specification allows for there to be no HDM decoders on CXL
Host Bridges if they have only a single root port. Instead, all accesses
directed to the host bridge (as specified in CXL Fixed Memory Windows)
are assumed to be routed to the single root port.
Linux currently assumes this implementation choice. So to simplify testing,
make QEMU emulation also default to no HDM decoders under these particular
circumstances, but provide a hdm_for_passthrough boolean option to have
HDM decoders as previously.
Technically this is breaking backwards compatibility, but given the only
known software stack used with the QEMU emulation is the Linux kernel
and this configuration did not work before this change, there are
unlikely to be any complaints that it now works. The option is retained
to allow testing of software that does allow for these HDM decoders to exist,
once someone writes it.
Reported-by: Fan Ni <fan.ni@samsung.com>
Reviewed-by: Fan Ni <fan.ni@samsung.com>
Tested-by: Fan Ni <fan.ni@samsung.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
--
v2: Pick up and fix typo in tag from Fan Ni
Message-Id: <20230227153128.8164-3-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
These two helpers enable host bridges to operate differently depending on
the number of downstream ports, in particular if there is only a single
port.
Useful for CXL where HDM address decoders are allowed to be implicit in
the host bridge if there is only a single root port.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20230227153128.8164-2-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Add basic implementation of the AC'97 sound part used in VIA south
bridge chips. Not all features of the device is emulated, only one
playback channel is supported for now but this is enough to get sound
output from some guests using this device on pegasos2.
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Volker Rümelin <vr_qemu@t-online.de>
Tested-by: Rene Engel <ReneEngel80@emailn.de>
Message-Id: <63b99410895312f40e7be479f581da0805e605a1.1678188711.git.balaton@eik.bme.hu>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Back in the mists of time, before EISA came along and required per-pin
level control in the ELCR register, the i8259 had a single chip-wide
level-mode control in bit 3 of ICW1.
Even in the PIIX3 datasheet from 1996 this is documented as 'This bit is
disabled', but apparently MorphOS is using it in the version of the
i8259 which is in the Pegasos2 board as part of the VT8231 chipset.
It's easy enough to implement, and I think it's harmless enough to do so
unconditionally.
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
[balaton: updated commit message as asked by author]
Tested-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Message-Id: <3f09b2dd109d19851d786047ad5c2ff459c90cd7.1678188711.git.balaton@eik.bme.hu>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
QOM objects shouldn't access each other internals fields
except using the QOM API.
mips_cps_realize() instantiates a TYPE_MIPS_ITU object, and
directly sets the 'saar' pointer:
if (saar_present) {
s->itu.saar = &env->CP0_SAAR;
}
In order to avoid that, pass the MIPS_CPU object via a QOM
link property, and set the 'saar' pointer in mips_itu_realize().
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Message-Id: <20230203113650.78146-10-philmd@linaro.org>
Some length properties are signed, other unsigned:
hw/mips/cps.c:183: DEFINE_PROP_UINT32("num-vp", MIPSCPSState, num_vp, 1),
hw/mips/cps.c:184: DEFINE_PROP_UINT32("num-irq", MIPSCPSState, num_irq, 256),
hw/misc/mips_cmgcr.c:215: DEFINE_PROP_INT32("num-vp", MIPSGCRState, num_vps, 1),
hw/misc/mips_cpc.c:167: DEFINE_PROP_UINT32("num-vp", MIPSCPCState, num_vp, 0x1),
hw/misc/mips_itu.c:552: DEFINE_PROP_INT32("num-fifo", MIPSITUState, num_fifo,
hw/misc/mips_itu.c:554: DEFINE_PROP_INT32("num-semaphores", MIPSITUState,
Since negative values are not used (the minimum is '0'),
unify by declaring all properties as unsigned.
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230203113650.78146-9-philmd@linaro.org>
Continuing the refactor of a48e7d9e52 (gdbstub: move guest debug support
check to ops) by removing hardcoded kvm_enabled() from generic cpu.c
code, and replace it with a property of AccelOpsClass.
Signed-off-by: Mads Ynddal <m.ynddal@samsung.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230207131721.49233-1-mads@ynddal.dk>
[AJB: add ifdef around update_guest_debug_ops, fix brace]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230302190846.2593720-27-alex.bennee@linaro.org>
Message-Id: <20230303025805.625589-30-richard.henderson@linaro.org>
This function is unused, except to implement gdb_do_syscall.
Fold the implementations together.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230303025805.625589-27-richard.henderson@linaro.org>
While we will continue to include this via cpu-defs it is useful to be
able to define this separately for 32 and 64 bit versions of an
otherwise target independent compilation unit.
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230302190846.2593720-25-alex.bennee@linaro.org>
Message-Id: <20230303025805.625589-25-richard.henderson@linaro.org>
Our GDB syscall support is the last chunk of code that needs target
specific support so move it to a new file. We take the opportunity to
move the syscall state into its own singleton instance and add in a
few helpers for the main gdbstub to interact with the module.
I also moved the gdb_exit() declaration into syscalls.h as it feels
pretty related and most of the callers of it treat it as such.
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230302190846.2593720-22-alex.bennee@linaro.org>
Message-Id: <20230303025805.625589-22-richard.henderson@linaro.org>
These inline helpers are all used by target specific code so move them
out of the general header so we don't needlessly pollute the rest of
the API with target specific stuff.
Note we have to include cpu.h in semihosting as it was relying on a
side effect before.
Reviewed-by: Taylor Simpson <tsimpson@quicinc.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230302190846.2593720-21-alex.bennee@linaro.org>
Message-Id: <20230303025805.625589-21-richard.henderson@linaro.org>
The process was pretty similar to the softmmu move except we take the
time to split stuff between user.c and user-target.c to avoid as much
target specific compilation as possible. We also start to make use of
our shiny new header scheme so the user-only helpers can be included
without the rest of the exec/gsbstub.h cruft.
As before we split some functions into user and softmmu versions
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230302190846.2593720-12-alex.bennee@linaro.org>
Message-Id: <20230303025805.625589-12-richard.henderson@linaro.org>
Pick names that align with the section drivers should use them from,
avoiding the confusion of calling a _finalize() function from _exit()
and generalizing the actual _finalize() to handle removing the viommu
blocker.
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
Link: https://lore.kernel.org/r/167820912978.606734.12740287349119694623.stgit@omen
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
CXL uses PCI AER Internal errors to signal to the host that an error has
occurred. The host can then read more detailed status from the CXL RAS
capability.
For uncorrectable errors: support multiple injection in one operation
as this is needed to reliably test multiple header logging support in an
OS. The equivalent feature doesn't exist for correctable errors, so only
one error need be injected at a time.
Note:
- Header content needs to be manually specified in a fashion that
matches the specification for what can be in the header for each
error type.
Injection via QMP:
{ "execute": "qmp_capabilities" }
...
{ "execute": "cxl-inject-uncorrectable-errors",
"arguments": {
"path": "/machine/peripheral/cxl-pmem0",
"errors": [
{
"type": "cache-address-parity",
"header": [ 3, 4]
},
{
"type": "cache-data-parity",
"header": [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31]
},
{
"type": "internal",
"header": [ 1, 2, 4]
}
]
}}
...
{ "execute": "cxl-inject-correctable-error",
"arguments": {
"path": "/machine/peripheral/cxl-pmem0",
"type": "physical"
} }
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20230302133709.30373-9-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This infrastructure will be reused for CXL RAS error injection
in patches that follow.
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20230302133709.30373-8-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Fan Ni <fan.ni@samsung.com>
This register in AER should be both writeable and should
have a default value with a couple of the errors masked
including the Uncorrectable Internal Error used by CXL for
it's error reporting.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Message-Id: <20230302133709.30373-2-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Fan Ni <fan.ni@samsung.com>
Provide pcihp specific callback to check if bus is hotpluggable
and consolidate its scattered hotplug criteria there.
While at it clean up no longer needed
qbus_set_hotplug_handler(BUS(bus), NULL)
workarounds since callback makes qbus_is_hotpluggable() return
correct answer even if hotplug_handler is set on bus.
PS:
see ("pci: fix 'hotplugglable' property behavior") for details
why callback was introduced.
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20230302161543.286002-35-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
... instead of duplicating them in piix4 and lpc and then
trying to pass them to pcihp routines as arguments.
it simplifies call sites and places pcihp specific in
its own structure.
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20230302161543.286002-34-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20230302161543.286002-33-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Currently the property may flip its state
during VM bring up or just doesn't work as
the name implies.
In particular with PCIE root port that has
'hotplug={on|off}' property, and when it's
turned off, one would expect
'hotpluggable' == false
for any devices attached to it.
Which is not the case since qbus_is_hotpluggable()
used by the property just checks for presence
of any hotplug_handler set on bus.
The problem is that name BusState::hotplug_handler
from its inception is misnomer, as it handles
not only hotplug but also in many cases coldplug
as well (i.e. generic wiring interface), and
it's fine to have hotplug_handler set on bus
while it doesn't support hotplug (ex. pcie-slot
with hotplug=off).
Another case of root port flipping 'hotpluggable'
state when ACPI PCI hotplug is enabled in this
case root port with 'hotplug=off' starts as
hotpluggable and then later on, pcihp
hotplug_handler clears hotplug_handler
explicitly after checking root port's 'hotplug'
property.
So root-port hotpluggablity check sort of works
if pcihp is enabled but is broken if pcihp is
disabled.
One way to deal with the issue is to ask
hotplug_handler if bus it controls is hotpluggable
or not. To do that add is_hotpluggable_bus()
hook to HotplugHandler interface and use it in
'hotpluggable' property + teach pcie-slot to
actually look into 'hotplug' property state
before deciding if bus is hotpluggable.
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20230302161543.286002-13-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Devices with CVQ need to migrate state beyond vq state. Leaving this to
future series.
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Message-Id: <20230303172445.1089785-11-eperezma@redhat.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
The function vhost.c:vhost_dev_stop calls vhost operation
vhost_dev_start(false). In the case of vdpa it totally reset and wipes
the device, making the fetching of the vring base (virtqueue state) totally
useless.
The kernel backend does not use vhost_dev_start vhost op callback, but
vhost-user do. A patch to make vhost_user_dev_start more similar to vdpa
is desirable, but it can be added on top.
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Message-Id: <20230303172445.1089785-8-eperezma@redhat.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This allows vhost_vdpa to track if it is safe to get the vring base from
the device or not. If it is not, vhost can fall back to fetch idx from
the guest buffer again.
No functional change intended in this patch, later patches will use this
field.
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Message-Id: <20230303172445.1089785-6-eperezma@redhat.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Add 'throttle-bps' and 'throttle-ops' limitation to set QoS. The
two arguments work with both QEMU command line and QMP command.
Example of QEMU command line:
-object cryptodev-backend-builtin,id=cryptodev1,throttle-bps=1600,\
throttle-ops=100
Example of QMP command:
virsh qemu-monitor-command buster --hmp qom-set /objects/cryptodev1 \
throttle-ops 100
or cancel limitation:
virsh qemu-monitor-command buster --hmp qom-set /objects/cryptodev1 \
throttle-ops 0
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Message-Id: <20230301105847.253084-11-pizhenwei@bytedance.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Account OPS/BPS for crypto device, this will be used for 'query-stats'
QEMU monitor command and QoS in the next step.
Note that a crypto device may support symmetric mode, asymmetric mode,
both symmetric and asymmetric mode. So we use two structure to
describe the statistics of a crypto device.
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Message-Id: <20230301105847.253084-10-pizhenwei@bytedance.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Move queue_index, CryptoDevCompletionFunc and opaque into struct
CryptoDevBackendOpInfo, then cryptodev_backend_crypto_operation()
needs an argument CryptoDevBackendOpInfo *op_info only. And remove
VirtIOCryptoReq from cryptodev. It's also possible to hide
VirtIOCryptoReq into virtio-crypto.c in the next step. (In theory,
VirtIOCryptoReq is a private structure used by virtio-crypto only)
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Message-Id: <20230301105847.253084-9-pizhenwei@bytedance.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Example of this command:
# virsh qemu-monitor-command vm --hmp info cryptodev
cryptodev1: service=[akcipher|mac|hash|cipher]
queue 0: type=builtin
cryptodev0: service=[akcipher]
queue 0: type=lkcf
Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Message-Id: <20230301105847.253084-8-pizhenwei@bytedance.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Introduce cryptodev alg type in cryptodev.json, then apply this to
related codes, and drop 'enum CryptoDevBackendAlgType'.
There are two options:
1, { 'enum': 'QCryptodevBackendAlgType',
'prefix': 'CRYPTODEV_BACKEND_ALG',
'data': ['sym', 'asym']}
Then we can keep 'CRYPTODEV_BACKEND_ALG_SYM' and avoid lots of
changes.
2, changes in this patch(with prefix 'QCRYPTODEV_BACKEND_ALG').
To avoid breaking the rule of QAPI, use 2 here.
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Message-Id: <20230301105847.253084-4-pizhenwei@bytedance.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
We have already used qapi to generate crypto device types, this allows
to convert type to a string 'model', so the 'model' field is not
needed.
And the 'name' field is not used by any backend driver, drop it.
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Message-Id: <20230301105847.253084-3-pizhenwei@bytedance.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Introduce QCryptodevBackendType in cryptodev.json, also apply this to
related codes. Then we can drop 'enum CryptoDevBackendOptionsType'.
Note that `CRYPTODEV_BACKEND_TYPE_NONE` is *NOT* used by anywhere, so
drop it(no 'none' enum in QCryptodevBackendType).
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Message-Id: <20230301105847.253084-2-pizhenwei@bytedance.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Migrating with vIOMMU will require either tracking maximum
IOMMU supported address space (e.g. 39/48 address width on Intel)
or range-track current mappings and dirty track the new ones
post starting dirty tracking. This will be done as a separate
series, so add a live migration blocker until that is fixed.
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20230307125450.62409-14-joao.m.martins@oracle.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Add device dirty page tracking start/stop functionality. This uses the
device DMA logging uAPI to start and stop dirty page tracking by device.
Device dirty page tracking is used only if all devices within a
container support device dirty page tracking.
Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Link: https://lore.kernel.org/r/20230307125450.62409-11-joao.m.martins@oracle.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This aids subsystems (like gdbstub) that want to trigger a flush
without pulling target specific headers.
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230302190846.2593720-8-alex.bennee@linaro.org>
Message-Id: <20230303025805.625589-8-richard.henderson@linaro.org>
Prototypes using gdb_syscall_complete_cb() or gdb_?et_reg_cb()
don't depend on "cpu.h", thus are not target-specific.
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20221214143659.62133-1-philmd@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230302190846.2593720-4-alex.bennee@linaro.org>
Message-Id: <20230303025805.625589-4-richard.henderson@linaro.org>
This header is now only for native Xen code, not PV backends that may be
used in Xen emulation. Since the toolstack libraries may depend on the
specific version of Xen headers that they pull in (and will set the
__XEN_TOOLS__ macro to enable internal definitions that they depend on),
the rule is that xen_native.h (and thus the toolstack library headers)
must be included *before* any of the headers in include/hw/xen/interface.
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
There's no need for this to be in the Xen accel code, and as we want to
use the Xen console support with KVM-emulated Xen we'll want to have a
platform-agnostic version of it. Make it use GString to build up the
path while we're at it.
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
The previous commit introduced redirectable gnttab operations fairly
much like-for-like, with the exception of the extra arguments to the
->open() call which were always NULL/0 anyway.
This *changes* the arguments to the ->unmap() operation to include the
original ref# that was mapped. Under real Xen it isn't necessary; all we
need to do from QEMU is munmap(), then the kernel will release the grant,
and Xen does the tracking/refcounting for the guest.
When we have emulated grant tables though, we need to do all that for
ourselves. So let's have the back ends keep track of what they mapped
and pass it in to the ->unmap() method for us.
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
Move the existing code using libxengnttab to xen-operations.c and allow
the operations to be redirected so that we can add emulation of grant
table mapping for backend drivers.
In emulation, mapping more than one grant ref to be virtually contiguous
would be fairly difficult. The best way to do it might be to make the
ram_block mappings actually backed by a file (shmem or a deleted file,
perhaps) so that we can have multiple *shared* mappings of it. But that
would be fairly intrusive.
Making the backend drivers cope with page *lists* instead of expecting
the mapping to be contiguous is also non-trivial, since some structures
would actually *cross* page boundaries (e.g. the 32-bit blkif responses
which are 12 bytes).
So for now, we'll support only single-page mappings in emulation. Add a
XEN_GNTTAB_OP_FEATURE_MAP_MULTIPLE flag to indicate that the native Xen
implementation *does* support multi-page maps, and a helper function to
query it.
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
The existing implementation calling into the real libxenevtchn moves to
a new file hw/xen/xen-operations.c, and is called via a function table
which in a subsequent commit will also be able to invoke the emulated
event channel support.
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
nmi.h and notify.h are not needed here, drop them to speed up
the compiling a little bit.
Message-Id: <20230210111438.1114600-1-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
* Support for the Zicbiom, ZCicboz, and Zicbop extensions.
* OpenSBI has been updated to version 1.2, see
<https://github.com/riscv-software-src/opensbi/releases/tag/v1.2> for
the release notes.
* Support for setting the virtual address width (ie, sv39/sv48/sv57) on
the command line.
* Support for ACPI on RISC-V.
-----BEGIN PGP SIGNATURE-----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=5gAt
-----END PGP SIGNATURE-----
Merge tag 'pull-riscv-to-apply-20230306' of https://gitlab.com/palmer-dabbelt/qemu into staging
Sixth RISC-V PR for 8.0
* Support for the Zicbiom, ZCicboz, and Zicbop extensions.
* OpenSBI has been updated to version 1.2, see
<https://github.com/riscv-software-src/opensbi/releases/tag/v1.2> for
the release notes.
* Support for setting the virtual address width (ie, sv39/sv48/sv57) on
the command line.
* Support for ACPI on RISC-V.
# -----BEGIN PGP SIGNATURE-----
#
# iQJHBAABCAAxFiEEKzw3R0RoQ7JKlDp6LhMZ81+7GIkFAmQGYGgTHHBhbG1lckBk
# YWJiZWx0LmNvbQAKCRAuExnzX7sYidmyEAC6FEMbbFM5D++qR6w6xM6hXgzcrev6
# s1kyRRNVa45uSA78ti/Zi0hsDLNf7ZsNPndF0OIkkO5iAE0OVm3LU7tV1TqKcT82
# Dd9VXxe93zEmfnuJazHrMa54SXPhhnNdWHtKlZ6vBfZpbxgx0FFs50xkCsrM5LQZ
# hYHxQUqPWQTvF2MdDHrxCuLcdKl+Wg3ysCcgRh2d049KUBrIu6vNaHC2+AGRjCbj
# BkrGCkB82fTmVJjzAcVWQxLoAV12pCbJS4og1GtP8hA7WevtB39tbPin9siBKRZp
# QBeiIsg0nebkpmZGrb+xWVwlIBNe9yYwJa0KmveQk8v7L5RIzjM1mtDL91VrVljC
# KC2tfT570m0Iq2NoFMb3wd/kESHFzVDM/g+XYqRd4KSoiCNP/RbqYNQBwbMc31Tr
# E27xfA1D8w2vem0Rk20x3KgPf1Z5OmGXjq6YObTpnAzG8cZlA37qKBP+ortt5aHX
# GZSg3CAwknHHVajd4aaegkPsHxm1tRvoTfh38MwkPSNxaA9GD0nz0k9xaYDmeZ2L
# olfanNsaQEwcVUId31+7sAENg1TZU0fnj879/nxkMUCazVTdL8/mz+IoTTx0QCST
# 3+9ATWcyJUlmjbDKIs7kr1L+wJdvvHEJggPAbbPI8ekpXaLZvUYOT6ObzYKNAmwY
# wELQBn8QKXcLVA==
# =5gAt
# -----END PGP SIGNATURE-----
# gpg: Signature made Mon 06 Mar 2023 21:51:36 GMT
# gpg: using RSA key 2B3C3747446843B24A943A7A2E1319F35FBB1889
# gpg: issuer "palmer@dabbelt.com"
# gpg: Good signature from "Palmer Dabbelt <palmer@dabbelt.com>" [unknown]
# gpg: aka "Palmer Dabbelt <palmerdabbelt@google.com>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg: There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 00CE 76D1 8349 60DF CE88 6DF8 EF4C A150 2CCB AB41
# Subkey fingerprint: 2B3C 3747 4468 43B2 4A94 3A7A 2E13 19F3 5FBB 1889
* tag 'pull-riscv-to-apply-20230306' of https://gitlab.com/palmer-dabbelt/qemu: (22 commits)
MAINTAINERS: Add entry for RISC-V ACPI
hw/riscv/virt.c: Initialize the ACPI tables
hw/riscv/virt: virt-acpi-build.c: Add RHCT Table
hw/riscv/virt: virt-acpi-build.c: Add RINTC in MADT
hw/riscv/virt: Enable basic ACPI infrastructure
hw/riscv/virt: Add memmap pointer to RiscVVirtState
hw/riscv/virt: Add a switch to disable ACPI
hw/riscv/virt: Add OEM_ID and OEM_TABLE_ID fields
riscv: Correctly set the device-tree entry 'mmu-type'
riscv: Introduce satp mode hw capabilities
riscv: Allow user to set the satp mode
riscv: Change type of valid_vm_1_10_[32|64] to bool
riscv: Pass Object to register_cpu_props instead of DeviceState
roms/opensbi: Upgrade from v1.1 to v1.2
gitlab/opensbi: Move to docker:stable
hw: intc: Use cpu_by_arch_id to fetch CPU state
target/riscv: cpu: Implement get_arch_id callback
disas/riscv Fix ctzw disassemble
hw/riscv/virt.c: add cbo[mz]-block-size fdt properties
target/riscv: add Zicbop cbo.prefetch{i, r, m} placeholder
...
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
The barrier comes after an atomic increment, so it is enough to use
smp_mb__after_rmw(); this avoids a double barrier on x86 systems.
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
On ARM, seqcst loads and stores (which QEMU does not use) are compiled
respectively as LDAR and STLR instructions. Even though LDAR is
also used for load-acquire operations, it also waits for all STLRs to
leave the store buffer. Thus, LDAR and STLR alone are load-acquire
and store-release operations, but LDAR also provides store-against-load
ordering as long as the previous store is a STLR.
Compare this to ARMv7, where store-release is DMB+STR and load-acquire
is LDR+DMB, but an additional DMB is needed between store-seqcst and
load-seqcst (e.g. DMB+STR+DMB+LDR+DMB); or with x86, where MOV provides
load-acquire and store-release semantics and the two can be reordered.
Likewise, on ARM sequentially consistent read-modify-write operations only
need to use LDAXR and STLXR respectively for the load and the store, while
on x86 they need to use the stronger LOCK prefix.
In a strange twist of events, however, the _stronger_ semantics
of the ARM instructions can end up causing bugs on ARM, not on x86.
The problems occur when seqcst atomics are mixed with relaxed atomics.
QEMU's atomics try to bridge the Linux API (that most of the developers
are familiar with) and the C11 API, and the two have a substantial
difference:
- in Linux, strongly-ordered atomics such as atomic_add_return() affect
the global ordering of _all_ memory operations, including for example
READ_ONCE()/WRITE_ONCE()
- in C11, sequentially consistent atomics (except for seq-cst fences)
only affect the ordering of sequentially consistent operations.
In particular, since relaxed loads are done with LDR on ARM, they are
not ordered against seqcst stores (which are done with STLR).
QEMU implements high-level synchronization primitives with the idea that
the primitives contain the necessary memory barriers, and the callers can
use relaxed atomics (qatomic_read/qatomic_set) or even regular accesses.
This is very much incompatible with the C11 view that seqcst accesses
are only ordered against other seqcst accesses, and requires using seqcst
fences as in the following example:
qatomic_set(&y, 1); qatomic_set(&x, 1);
smp_mb(); smp_mb();
... qatomic_read(&x) ... ... qatomic_read(&y) ...
When a qatomic_*() read-modify write operation is used instead of one
or both stores, developers that are more familiar with the Linux API may
be tempted to omit the smp_mb(), which will work on x86 but not on ARM.
This nasty difference between Linux and C11 read-modify-write operations
has already caused issues in util/async.c and more are being found.
Provide something similar to Linux smp_mb__before/after_atomic(); this
has the double function of documenting clearly why there is a memory
barrier, and avoiding a double barrier on x86 and s390x systems.
The new macro can already be put to use in qatomic_mb_set().
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
