Pass vece to tcg_target_const_match() to allow correct interpretation of
const args of vector ops.
Signed-off-by: Jiajie Chen <c@jia.je>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230908022302.180442-4-c@jia.je>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
LSX support on host cpu is detected via hwcap.
Lower the following ops to LSX:
- dup_vec
- dupi_vec
- dupm_vec
- ld_vec
- st_vec
Signed-off-by: Jiajie Chen <c@jia.je>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230908022302.180442-3-c@jia.je>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Add opcodes and encoder functions for LSX.
Generated from
https://github.com/jiegec/loongarch-opcodes/tree/qemu-lsx.
Signed-off-by: Jiajie Chen <c@jia.je>
Acked-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230908022302.180442-2-c@jia.je>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Alpha, IA-64, and PA-RISC hosts are no longer supported.
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20230808152314.102036-1-akihiko.odaki@daynix.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
IA-64 and PA-RISC host support is already removed with commit
b1cef6d02f ("Drop remaining bits of ia64 host support").
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-Id: <20230810225922.21600-1-akihiko.odaki@daynix.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
When memory region is ram, the lower TARGET_PAGE_BITS is not the
physical section number. Instead, its value is always 0.
Add comment and assert to make it clear.
Signed-off-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Message-Id: <20230901060118.379-1-zhiwei_liu@linux.alibaba.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
mttcg asserts that an execution ending with EXCP_HALTED must have
cpu->halted. However between the event or instruction that sets
cpu->halted and requests exit and the assertion here, an
asynchronous event could clear cpu->halted.
This leads to crashes running AIX on ppc/pseries because it uses
H_CEDE/H_PROD hcalls, where H_CEDE sets self->halted = 1 and
H_PROD sets other cpu->halted = 0 and kicks it.
H_PROD could be turned into an interrupt to wake, but several other
places in ppc, sparc, and semihosting follow what looks like a similar
pattern setting halted = 0 directly. So remove this assertion.
Reported-by: Ivan Warren <ivan@vmfacility.fr>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-Id: <20230829010658.8252-1-npiggin@gmail.com>
[rth: Keep the case label and adjust the comment.]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Replace select() with poll() to fix a crash when QEMU has a large number
of FDs. Also use RETRY_ON_EINTR to avoid unnecessary errors due to EINTR.
Cc: qemu-stable@nongnu.org
Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=2020133
Fixes: 56a3c24ffc ("tpm: Probe for connected TPM 1.2 or TPM 2")
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
- vhost-user-gpu: support dmabuf modifiers
- fix VNC crash when there are no active_console
- cleanups and refactoring in ui/vc code
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Merge tag 'ui-pull-request' of https://gitlab.com/marcandre.lureau/qemu into staging
UI patch queue
- vhost-user-gpu: support dmabuf modifiers
- fix VNC crash when there are no active_console
- cleanups and refactoring in ui/vc code
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# gpg: Signature made Tue 12 Sep 2023 06:46:22 EDT
# gpg: using RSA key 87A9BD933F87C606D276F62DDAE8E10975969CE5
# gpg: issuer "marcandre.lureau@redhat.com"
# gpg: Good signature from "Marc-André Lureau <marcandre.lureau@redhat.com>" [full]
# gpg: aka "Marc-André Lureau <marcandre.lureau@gmail.com>" [full]
# Primary key fingerprint: 87A9 BD93 3F87 C606 D276 F62D DAE8 E109 7596 9CE5
* tag 'ui-pull-request' of https://gitlab.com/marcandre.lureau/qemu:
ui: add precondition for dpy_get_ui_info()
ui: fix crash when there are no active_console
virtio-gpu/win32: set the destroy function on load
ui/console: move DisplaySurface to its own header
ui/vc: split off the VC part from console.c
ui/vc: preliminary QemuTextConsole changes before split
ui/console: remove redundant format field
ui/vc: rename kbd_put to qemu_text_console functions
ui/vc: remove kbd_put_keysym() and update function calls
vmmouse: use explicit code
vmmouse: replace DPRINTF with tracing
vhost-user-gpu: support dmabuf modifiers
contrib/vhost-user-gpu: add support for sending dmabuf modifiers
docs: vhost-user-gpu: add protocol changes for dmabuf modifiers
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
x86_cpu_get_supported_cpuid() is generic and handles the different
accelerators. Use it instead of kvm_arch_get_supported_cpuid().
That fixes a link failure introduced by commit 3adce820cf
("target/i386: Remove unused KVM stubs") when QEMU is configured
as:
$ ./configure --cc=clang \
--target-list=x86_64-linux-user,x86_64-softmmu \
--enable-debug
We were getting:
[71/71] Linking target qemu-x86_64
FAILED: qemu-x86_64
/usr/bin/ld: libqemu-x86_64-linux-user.fa.p/target_i386_cpu.c.o: in function `cpu_x86_cpuid':
cpu.c:(.text+0x1374): undefined reference to `kvm_arch_get_supported_cpuid'
/usr/bin/ld: libqemu-x86_64-linux-user.fa.p/target_i386_cpu.c.o: in function `x86_cpu_filter_features':
cpu.c:(.text+0x81c2): undefined reference to `kvm_arch_get_supported_cpuid'
/usr/bin/ld: cpu.c:(.text+0x81da): undefined reference to `kvm_arch_get_supported_cpuid'
/usr/bin/ld: cpu.c:(.text+0x81f2): undefined reference to `kvm_arch_get_supported_cpuid'
/usr/bin/ld: cpu.c:(.text+0x820a): undefined reference to `kvm_arch_get_supported_cpuid'
/usr/bin/ld: libqemu-x86_64-linux-user.fa.p/target_i386_cpu.c.o:cpu.c:(.text+0x8225): more undefined references to `kvm_arch_get_supported_cpuid' follow
clang: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.
For the record, this is because '--enable-debug' disables
optimizations (CFLAGS=-O0).
While at this (un)optimization level GCC eliminate the
following dead code (CPP output of mentioned build):
static void x86_cpu_get_supported_cpuid(uint32_t func, uint32_t index,
uint32_t *eax, uint32_t *ebx,
uint32_t *ecx, uint32_t *edx)
{
if ((0)) {
*eax = kvm_arch_get_supported_cpuid(kvm_state, func, index, R_EAX);
*ebx = kvm_arch_get_supported_cpuid(kvm_state, func, index, R_EBX);
*ecx = kvm_arch_get_supported_cpuid(kvm_state, func, index, R_ECX);
*edx = kvm_arch_get_supported_cpuid(kvm_state, func, index, R_EDX);
} else if (0) {
*eax = 0;
*ebx = 0;
*ecx = 0;
*edx = 0;
} else {
*eax = 0;
*ebx = 0;
*ecx = 0;
*edx = 0;
}
Clang does not (see commit 2140cfa51d "i386: Fix build by
providing stub kvm_arch_get_supported_cpuid()").
Cc: qemu-stable@nongnu.org
Fixes: 3adce820cf ("target/i386: Remove unused KVM stubs")
Reported-by: Kevin Wolf <kwolf@redhat.com>
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20230913093009.83520-4-philmd@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
x86_cpu_get_supported_cpuid() already checks for KVM/HVF
accelerators, so it is not needed to manually check it via
a call to accel_uses_host_cpuid() before calling it.
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20230913093009.83520-3-philmd@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
In case more code is added after the kvm_hyperv_expand_features()
call, check its return value (since it can fail).
Fixes: 071ce4b03b ("i386: expand Hyper-V features during CPU feature expansion time")
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20230913093009.83520-2-philmd@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
qemu 8.1.0 breaks on illumos platforms due to _XOPEN_SOURCE and others no longer being set correctly, leading to breakage such as:
https://us-central.manta.mnx.io/pkgsrc/public/reports/trunk/tools/20230908.1404/qemu-8.1.0/build.log
This is a result of meson conversion which incorrectly matches against 'solaris' instead of 'sunos' for uname.
First time submitting a patch here, hope I did it correctly. Thanks.
Signed-off-by: Jonathan Perkin <jonathan@perkin.org.uk>
Message-ID: <ZPtdxtum9UVPy58J@perkin.org.uk>
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Instead of using a variable-length array in nvme_map_prp(),
allocate on the stack with a g_autofree pointer.
The codebase has very few VLAs, and if we can get rid of them all we
can make the compiler error on new additions. This is a defensive
measure against security bugs where an on-stack dynamic allocation
isn't correctly size-checked (e.g. CVE-2021-3527).
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
In nvme_map_sgl() we create an array segment[] whose size is the
'const int SEG_CHUNK_SIZE'. Since this is C, rather than C++, a
"const int foo" is not a true constant, it's merely a variable with a
constant value, and so semantically segment[] is a variable-length
array. Switch SEG_CHUNK_SIZE to a #define so that we can make the
segment[] array truly fixed-size, in the sense that it doesn't
trigger the -Wvla warning.
The codebase has very few VLAs, and if we can get rid of them all we
can make the compiler error on new additions. This is a defensive
measure against security bugs where an on-stack dynamic allocation
isn't correctly size-checked (e.g. CVE-2021-3527).
[PMM: rebased (function has moved file), expand commit message
based on discussion from previous version of patch]
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
We recently had issues with nvme devices on big endian platforms.
Include their compilation on s390x to ease tests.
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Message-ID: <20230828150148.120031-1-clg@kaod.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Acked-by: Klaus Jensen <k.jensen@samsung.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Enabling AP-passthrough(AP-pt) for PV-guest by using the new CPU
features for PV-AP-pt of KVM.
As usual QEMU first checks which CPU features are available and then
sets them if available and selected by user. An additional check is done
to verify that PV-AP can only be enabled if "regular" AP-pt is enabled
as well. Note that KVM itself does not enforce this restriction.
Reviewed-by: Michael Mueller <mimu@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
Message-ID: <20230823142219.1046522-6-seiden@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
kvm_s390_set_attr() is a misleading name as it only sets attributes for
the KVM_S390_VM_CRYPTO group. Therefore, rename it to
kvm_s390_set_crypto_attr().
Add new functions ap_available() and ap_enabled() to avoid code
duplication later.
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Michael Mueller <mimu@linux.ibm.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
Message-ID: <20230823142219.1046522-5-seiden@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This update contains the required header changes for the
"target/s390x: AP-passthrough for PV guests" patch from
Steffen Eiden.
Message-ID: <20230912093432.180041-1-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Bound APQNs have to be reset before tearing down the secure config via
s390_machine_unprotect(). Otherwise the Ultravisor will return a error
code.
So let's do a subsystem_reset() which includes a AP reset before the
unprotect call. We'll do a full device_reset() afterwards which will
reset some devices twice. That's ok since we can't move the
device_reset() before the unprotect as it includes a CPU clear reset
which the Ultravisor does not expect at that point in time.
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Message-ID: <20230901114851.154357-1-frankja@linux.ibm.com>
Tested-by: Viktor Mihajlovski <mihajlov@linux.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
A subsystem reset contains a reset of AP resources which has been
missing. Adding the AP bridge to the list of device types that need
reset fixes this issue.
Reviewed-by: Jason J. Herne <jjherne@linux.ibm.com>
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Fixes: a51b3153 ("s390x/ap: base Adjunct Processor (AP) object model")
Message-ID: <20230823142219.1046522-2-seiden@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Ensure that it only get called when dpy_ui_info_supported(). The
function should always return a result. There should be a non-null
console or active_console.
Modify the argument to be const as well.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Albert Esteve <aesteve@redhat.com>
Move common declarations to console-priv.h, and add a new unit
console-vc.c which will handle VC/chardev rendering, when pixman is
available.
(if necessary, the move could be done chunk by chunks)
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Those changes will help to split console.c unit in the following commit.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
It's already part of PIXMAN image.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
They are QemuTextConsole functions, let's make it clear.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
The function calls to `kbd_put_keysym` have been updated to now call
`kbd_put_keysym_console` with a NULL console parameter.
Like most console functions, NULL argument is now for the active console.
This will allow to rename the text console functions in a consistent manner.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
It's weird to shift x & y without obvious reason. Let's make this more
explicit and future-proof.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
When the backend sends VHOST_USER_GPU_DMABUF_SCANOUT2, handle it
by getting the modifiers information which is now available.
Signed-off-by: Erico Nunes <ernunes@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Sergio Lopez <slp@redhat.com>
Message-Id: <20230714153900.475857-4-ernunes@redhat.com>
virglrenderer recently added virgl_renderer_resource_get_info_ext as a
new api, which gets resource information, including dmabuf modifiers.
We have to support dmabuf modifiers since the driver may choose to
allocate buffers with these modifiers for efficiency, and importing
buffers without modifiers information may result in completely broken
rendering.
Signed-off-by: Erico Nunes <ernunes@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Sergio Lopez <slp@redhat.com>
Message-Id: <20230714153900.475857-3-ernunes@redhat.com>
VHOST_USER_GPU_DMABUF_SCANOUT2 is defined as a message with all the
contents of VHOST_USER_GPU_DMABUF_SCANOUT plus the dmabuf modifiers
which were ommitted.
The VHOST_USER_GPU_PROTOCOL_F_DMABUF2 protocol feature is defined as a
way to check whether this new message is supported or not.
Signed-off-by: Erico Nunes <ernunes@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Sergio Lopez <slp@redhat.com>
Message-Id: <20230714153900.475857-2-ernunes@redhat.com>
* Small downtime optimisation for VFIO migration
* P2P support for VFIO migration
* Introduction of a save_prepare() handler to fail VFIO migration
* Fix on DMA logging ranges calculation for OVMF enabling dynamic window
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Merge tag 'pull-vfio-20230911' of https://github.com/legoater/qemu into staging
vfio queue:
* Small downtime optimisation for VFIO migration
* P2P support for VFIO migration
* Introduction of a save_prepare() handler to fail VFIO migration
* Fix on DMA logging ranges calculation for OVMF enabling dynamic window
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# gpg: Signature made Mon 11 Sep 2023 02:54:12 EDT
# gpg: using RSA key A0F66548F04895EBFE6B0B6051A343C7CFFBECA1
# gpg: Good signature from "Cédric Le Goater <clg@redhat.com>" [unknown]
# gpg: aka "Cédric Le Goater <clg@kaod.org>" [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: A0F6 6548 F048 95EB FE6B 0B60 51A3 43C7 CFFB ECA1
* tag 'pull-vfio-20230911' of https://github.com/legoater/qemu:
vfio/common: Separate vfio-pci ranges
vfio/migration: Block VFIO migration with background snapshot
vfio/migration: Block VFIO migration with postcopy migration
migration: Add .save_prepare() handler to struct SaveVMHandlers
migration: Move more initializations to migrate_init()
vfio/migration: Fail adding device with enable-migration=on and existing blocker
migration: Add migration prefix to functions in target.c
vfio/migration: Allow migration of multiple P2P supporting devices
vfio/migration: Add P2P support for VFIO migration
vfio/migration: Refactor PRE_COPY and RUNNING state checks
qdev: Add qdev_add_vm_change_state_handler_full()
sysemu: Add prepare callback to struct VMChangeStateEntry
vfio/migration: Move from STOP_COPY to STOP in vfio_save_cleanup()
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* Remove 'host' CPU from TCG
* riscv_htif Fixup printing on big endian hosts
* Add zmmul isa string
* Add smepmp isa string
* Fix page_check_range use in fault-only-first
* Use existing lookup tables for MixColumns
* Add RISC-V vector cryptographic instruction set support
* Implement WARL behaviour for mcountinhibit/mcounteren
* Add Zihintntl extension ISA string to DTS
* Fix zfa fleq.d and fltq.d
* Fix upper/lower mtime write calculation
* Make rtc variable names consistent
* Use abi type for linux-user target_ucontext
* Add RISC-V KVM AIA Support
* Fix riscv,pmu DT node path in the virt machine
* Update CSR bits name for svadu extension
* Mark zicond non-experimental
* Fix satp_mode_finalize() when satp_mode.supported = 0
* Fix non-KVM --enable-debug build
* Add new extensions to hwprobe
* Use accelerated helper for AES64KS1I
* Allocate itrigger timers only once
* Respect mseccfg.RLB for pmpaddrX changes
* Align the AIA model to v1.0 ratified spec
* Don't read the CSR in riscv_csrrw_do64
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Merge tag 'pull-riscv-to-apply-20230911' of https://github.com/alistair23/qemu into staging
First RISC-V PR for 8.2
* Remove 'host' CPU from TCG
* riscv_htif Fixup printing on big endian hosts
* Add zmmul isa string
* Add smepmp isa string
* Fix page_check_range use in fault-only-first
* Use existing lookup tables for MixColumns
* Add RISC-V vector cryptographic instruction set support
* Implement WARL behaviour for mcountinhibit/mcounteren
* Add Zihintntl extension ISA string to DTS
* Fix zfa fleq.d and fltq.d
* Fix upper/lower mtime write calculation
* Make rtc variable names consistent
* Use abi type for linux-user target_ucontext
* Add RISC-V KVM AIA Support
* Fix riscv,pmu DT node path in the virt machine
* Update CSR bits name for svadu extension
* Mark zicond non-experimental
* Fix satp_mode_finalize() when satp_mode.supported = 0
* Fix non-KVM --enable-debug build
* Add new extensions to hwprobe
* Use accelerated helper for AES64KS1I
* Allocate itrigger timers only once
* Respect mseccfg.RLB for pmpaddrX changes
* Align the AIA model to v1.0 ratified spec
* Don't read the CSR in riscv_csrrw_do64
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# gpg: Signature made Mon 11 Sep 2023 02:42:27 EDT
# gpg: using RSA key 6AE902B6A7CA877D6D659296AF7C95130C538013
# gpg: Good signature from "Alistair Francis <alistair@alistair23.me>" [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: 6AE9 02B6 A7CA 877D 6D65 9296 AF7C 9513 0C53 8013
* tag 'pull-riscv-to-apply-20230911' of https://github.com/alistair23/qemu: (45 commits)
target/riscv: don't read CSR in riscv_csrrw_do64
target/riscv: Align the AIA model to v1.0 ratified spec
target/riscv/pmp.c: respect mseccfg.RLB for pmpaddrX changes
target/riscv: Allocate itrigger timers only once
target/riscv: Use accelerated helper for AES64KS1I
linux-user/riscv: Add new extensions to hwprobe
hw/intc/riscv_aplic.c fix non-KVM --enable-debug build
hw/riscv/virt.c: fix non-KVM --enable-debug build
riscv: zicond: make non-experimental
target/riscv: fix satp_mode_finalize() when satp_mode.supported = 0
target/riscv: Update CSR bits name for svadu extension
hw/riscv: virt: Fix riscv,pmu DT node path
target/riscv: select KVM AIA in riscv virt machine
target/riscv: update APLIC and IMSIC to support KVM AIA
target/riscv: Create an KVM AIA irqchip
target/riscv: check the in-kernel irqchip support
target/riscv: support the AIA device emulation with KVM enabled
linux-user/riscv: Use abi type for target_ucontext
hw/intc: Make rtc variable names consistent
hw/intc: Fix upper/lower mtime write calculation
...
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Jiajie Chen