Gavin Shan [Tue, 9 May 2023 02:21:21 +0000 (12:21 +1000)]
kvm: Add helper kvm_dirty_ring_init()
Due to multiple capabilities associated with the dirty ring for different
architectures: KVM_CAP_DIRTY_{LOG_RING, LOG_RING_ACQ_REL} for x86 and
arm64 separately. There will be more to be done in order to support the
dirty ring for arm64.
Lets add helper kvm_dirty_ring_init() to enable the dirty ring. With this,
the code looks a bit clean.
No functional change intended.
Signed-off-by: Gavin Shan <gshan@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Tested-by: Zhenyu Zhang <zhenyzha@redhat.com>
Message-Id: <20230509022122.20888-4-gshan@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Gavin Shan [Tue, 9 May 2023 02:21:19 +0000 (12:21 +1000)]
migration: Add last stage indicator to global dirty log
The global dirty log synchronization is used when KVM and dirty ring
are enabled. There is a particularity for ARM64 where the backup
bitmap is used to track dirty pages in non-running-vcpu situations.
It means the dirty ring works with the combination of ring buffer
and backup bitmap. The dirty bits in the backup bitmap needs to
collected in the last stage of live migration.
In order to identify the last stage of live migration and pass it
down, an extra parameter is added to the relevant functions and
callbacks. This last stage indicator isn't used until the dirty
ring is enabled in the subsequent patches.
No functional change intended.
Signed-off-by: Gavin Shan <gshan@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Tested-by: Zhenyu Zhang <zhenyzha@redhat.com>
Message-Id: <20230509022122.20888-2-gshan@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Fabiano Rosas [Wed, 3 May 2023 20:39:46 +0000 (17:39 -0300)]
meson: Pass -j option to sphinx
Save a bit of build time by passing the number of jobs option to
sphinx.
We cannot use the -j option from make because meson does not support
setting build time parameters for custom targets. Use nproc instead or
the equivalent sphinx option "-j auto", if that is available (version
>=1.7.0).
Also make sure our plugins support parallelism and report it properly
to sphinx. Particularly, implement the merge_domaindata method in
DBusDomain that is used to merge in data from other subprocesses.
Tested-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Fabiano Rosas <farosas@suse.de>
Message-Id: <20230503203947.3417-2-farosas@suse.de> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Ricky Zhou [Mon, 1 May 2023 11:14:28 +0000 (04:14 -0700)]
target/i386: Fix exception classes for MOVNTPS/MOVNTPD.
Before this change, MOVNTPS and MOVNTPD were labeled as Exception Class
4 (only requiring alignment for legacy SSE instructions). This changes
them to Exception Class 1 (always requiring memory alignment), as
documented in the Intel manual.
Message-Id: <20230501111428.95998-3-ricky@rzhou.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Ricky Zhou [Mon, 1 May 2023 11:14:27 +0000 (04:14 -0700)]
target/i386: Fix exception classes for SSE/AVX instructions.
Fix the exception classes for some SSE/AVX instructions to match what is
documented in the Intel manual.
These changes are expected to have no functional effect on the behavior
that qemu implements (primarily >= 16-byte memory alignment checks). For
instance, since qemu does not implement the AC flag, there is no
difference in behavior between Exception Classes 4 and 5 for
instructions where the SSE version only takes <16 byte memory operands.
Message-Id: <20230501111428.95998-2-ricky@rzhou.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Ricky Zhou [Mon, 1 May 2023 11:14:26 +0000 (04:14 -0700)]
target/i386: Fix and add some comments next to SSE/AVX instructions.
Adds some comments describing what instructions correspond to decoding
table entries and fixes some existing comments which named the wrong
instruction.
Message-Id: <20230501111428.95998-1-ricky@rzhou.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Paolo Bonzini [Tue, 9 May 2023 14:17:15 +0000 (16:17 +0200)]
target/i386: fix operand size for VCOMI/VUCOMI instructions
Compared to other SSE instructions, VUCOMISx and VCOMISx are different:
the single and double precision versions are distinguished through a
prefix, however they use no-prefix and 0x66 for SS and SD respectively.
Scalar values usually are associated with 0xF2 and 0xF3.
Because of these, they incorrectly perform a 128-bit memory load instead
of a 32- or 64-bit load. Fix this by writing a custom decoding function.
I tested that the reproducer is fixed and the test-avx output does not
change.
As reported by the Intel's doc:
"FB_CLEAR: The processor will overwrite fill buffer values as part of
MD_CLEAR operations with the VERW instruction.
On these processors, L1D_FLUSH does not overwrite fill buffer values."
If this cpu feature is present in host, allow QEMU to choose whether to
show it to the guest too.
One disadvantage of not exposing it is that the guest will report
a non existing vulnerability in
/sys/devices/system/cpu/vulnerabilities/mmio_stale_data
because the mitigation is present only when the cpu has
(FLUSH_L1D and MD_CLEAR) or FB_CLEAR
features enabled.
Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Message-Id: <20230201135759.555607-3-eesposit@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
As reported by Intel's doc:
"L1D_FLUSH: Writeback and invalidate the L1 data cache"
If this cpu feature is present in host, allow QEMU to choose whether to
show it to the guest too.
One disadvantage of not exposing it is that the guest will report
a non existing vulnerability in
/sys/devices/system/cpu/vulnerabilities/mmio_stale_data
because the mitigation is present only when the cpu has
(FLUSH_L1D and MD_CLEAR) or FB_CLEAR
features enabled.
Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Message-Id: <20230201135759.555607-2-eesposit@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Two type hints fail centos-stream-8-x86_64 CI. They are actually
broken. Changing them to Optional[re.Match[str]] fixes them locally
for me, but then CI fails differently. Drop them for now.
Fixes: 3e32dca3f0d1 (qapi: Rewrite parsing of doc comment section symbols and tags) Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20230517061600.1782455-1-armbru@redhat.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Tested-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Michael Tokarev [Sun, 9 Apr 2023 10:53:27 +0000 (13:53 +0300)]
linux-user: fix getgroups/setgroups allocations
linux-user getgroups(), setgroups(), getgroups32() and setgroups32()
used alloca() to allocate grouplist arrays, with unchecked gidsetsize
coming from the "guest". With NGROUPS_MAX being 65536 (linux, and it
is common for an application to allocate NGROUPS_MAX for getgroups()),
this means a typical allocation is half the megabyte on the stack.
Which just overflows stack, which leads to immediate SIGSEGV in actual
system getgroups() implementation.
An example of such issue is aptitude, eg
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=811087#72
Cap gidsetsize to NGROUPS_MAX (return EINVAL if it is larger than that),
and use heap allocation for grouplist instead of alloca(). While at it,
fix coding style and make all 4 implementations identical.
Try to not impose random limits - for example, allow gidsetsize to be
negative for getgroups() - just do not allocate negative-sized grouplist
in this case but still do actual getgroups() call. But do not allow
negative gidsetsize for setgroups() since its argument is unsigned.
Capping by NGROUPS_MAX seems a bit arbitrary, - we can do more, it is
not an error if set size will be NGROUPS_MAX+1. But we should not allow
integer overflow for the array being allocated. Maybe it is enough to
just call g_try_new() and return ENOMEM if it fails.
Maybe there's also no need to convert setgroups() since this one is
usually smaller and known beforehand (KERN_NGROUPS_MAX is actually 63, -
this is apparently a kernel-imposed limit for runtime group set).
The patch fixes aptitude segfault mentioned above.
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Message-Id: <20230409105327.1273372-1-mjt@msgid.tls.msk.ru> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
If a program requires fr1, we should set the FR bit of CP0 control status
register and add F64 hardware flag. The corresponding `else if` branch
statement is copied from the linux kernel sources (see `arch_check_elf` function
in linux/arch/mips/kernel/elf.c).
Thomas Weißschuh [Sat, 22 Apr 2023 10:03:14 +0000 (12:03 +0200)]
linux-user: Don't require PROT_READ for mincore
The kernel does not require PROT_READ for addresses passed to mincore.
For example the fincore(1) tool from util-linux uses PROT_NONE and
currently does not work under qemu-user.
Thomas Weißschuh [Mon, 24 Apr 2023 15:34:29 +0000 (17:34 +0200)]
linux-user: Add open_tree() syscall
Signed-off-by: Thomas Weißschuh <thomas@t-8ch.de> Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20230424153429.276788-2-thomas@t-8ch.de>
[lv: move declaration at the beginning of the block,
define syscall] Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Thomas Weißschuh [Wed, 26 Apr 2023 07:06:59 +0000 (09:06 +0200)]
linux-user: report ENOTTY for unknown ioctls
The correct error number for unknown ioctls is ENOTTY.
ENOSYS would mean that the ioctl() syscall itself is not implemented,
which is very improbable and unexpected for userspace.
ENOTTY means "Inappropriate ioctl for device". This is what the kernel
returns on unknown ioctls, what qemu is trying to express and what
userspace is prepared to handle.
Signed-off-by: Thomas Weißschuh <thomas@t-8ch.de> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230426070659.80649-1-thomas@t-8ch.de> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Afonso Bordado [Sun, 5 Mar 2023 14:34:37 +0000 (14:34 +0000)]
linux-user: Emulate /proc/cpuinfo output for riscv
RISC-V does not expose all extensions via hwcaps, thus some userspace
applications may want to query these via /proc/cpuinfo.
Currently when querying this file the host's file is shown instead
which is slightly confusing. Emulate a basic /proc/cpuinfo file
with mmu info and an ISA string.
Signed-off-by: Afonso Bordado <afonsobordado@gmail.com> Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com> Acked-by: Palmer Dabbelt <palmer@rivosinc.com> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Message-Id: <167873059442.9885.15152085316575248452-0@git.sr.ht>
[lv: removed the test that fails in CI for unknown reason] Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Disconnect guest page size from TCG compilation.
While this could be done via exec/target_page.h, we want to cache
the value across multiple memory access operations, so we might
as well initialize this early.
The changes within tcg/ are entirely mechanical:
sed -i s/TARGET_PAGE_BITS/s->page_bits/g
sed -i s/TARGET_PAGE_MASK/s->page_mask/g
Reviewed-by: Anton Johansson <anjo@rev.ng> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Because of its use on tgen_arithi, this value must be a signed
32-bit quantity, as that is what may be encoded in the insn.
The truncation of the value to unsigned for 32-bit guests is
done via the REX bit via 'trexw'.
Removes the only uses of target_ulong from this tcg backend.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Since TCG_TYPE_I32 values are kept zero-extended in registers, via
omission of the REXW bit, we need not extend if the register matches.
This is already relied upon by qemu_{ld,st}.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
We now have the address size as part of the opcode, so
we no longer need to test TARGET_LONG_BITS. We can use
uint64_t for target_ulong, as passed into load/store helpers.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
tcg: Split INDEX_op_qemu_{ld,st}* for guest address size
For 32-bit hosts, we cannot simply rely on TCGContext.addr_bits,
as we need one or two host registers to represent the guest address.
Create the new opcodes and update all users. Since we have not
yet eliminated TARGET_LONG_BITS, only one of the two opcodes will
ever be used, so we can get away with treating them the same in
the backends.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Expand from TCGv to TCGTemp inline in the translators,
and validate that the size matches tcg_ctx->addr_type.
These inlines will eventually be seen only by target-specific code.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
We already pass uint64_t to restore_state_to_opc; this changes all
of the other uses from insn_start through the encoding to decoding.
Reviewed-by: Anton Johansson <anjo@rev.ng> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
No change to the ultimate load/store routines yet, so some atomicity
conditions not yet honored, but plumbs the change to alignment through
the relevant functions.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
No change to the ultimate load/store routines yet, so some atomicity
conditions not yet honored, but plumbs the change to alignment through
the relevant functions.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
With x86_64 as host, we do not have any temporaries with which to
resolve cycles, but we do have xchg. As a side bonus, the set of
graphs that can be made with 3 nodes and all nodes conflicting is
small: two. We can solve the cycle with a single temp.
This is required for x86_64 to handle stores of i128: 1 address
register and 2 data registers.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Add opcodes for backend support for 128-bit memory operations.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
The system is required to emulate unaligned accesses, even if the
hardware does not support it. The resulting trap may or may not
be more efficient than the qemu slow path. There are linux kernel
patches in flight to allow userspace to query hardware support;
we can re-evaluate whether to enable this by default after that.
In the meantime, softmmu now matches useronly, where we already
assumed that unaligned accesses are supported.
Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Drop the target-specific trampolines for the standard slow path.
This lets us use tcg_out_helper_{ld,st}_args, and handles the new
atomicity bits within MemOp.
At the same time, use the full load/store helpers for user-only mode.
Drop inline unaligned access support for user-only mode, as it does
not handle atomicity.
Use TCG_REG_T[1-3] in the tlb lookup, instead of TCG_REG_O[0-2].
This allows the constraints to be simplified.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
target/sparc64: Remove tcg_out_movi_s13 case from tcg_out_movi_imm32
Shuffle the order in tcg_out_movi_int to check s13 first, and
drop this check from tcg_out_movi_imm32. This might make the
sequence for in_prologue larger, but not worth worrying about.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
tcg/s390x: Use full load/store helpers in user-only mode
Instead of using helper_unaligned_{ld,st}, use the full load/store helpers.
This will allow the fast path to increase alignment to implement atomicity
while not immediately raising an alignment exception.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
tcg/mips: Use full load/store helpers in user-only mode
Instead of using helper_unaligned_{ld,st}, use the full load/store helpers.
This will allow the fast path to increase alignment to implement atomicity
while not immediately raising an alignment exception.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
tcg/arm: Use full load/store helpers in user-only mode
Instead of using helper_unaligned_{ld,st}, use the full load/store helpers.
This will allow the fast path to increase alignment to implement atomicity
while not immediately raising an alignment exception.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Always reserve r3 for tlb softmmu lookup. Fix a bug in user-only
ALL_QLDST_REGS, in that r14 is clobbered by the BLNE that leads
to the misaligned trap. Remove r0+r1 from user-only ALL_QLDST_REGS;
I believe these had been reserved for bswap, which we no longer
perform during qemu_st.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
tcg/riscv: Use full load/store helpers in user-only mode
Instead of using helper_unaligned_{ld,st}, use the full load/store helpers.
This will allow the fast path to increase alignment to implement atomicity
while not immediately raising an alignment exception.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
tcg/loongarch64: Use full load/store helpers in user-only mode
Instead of using helper_unaligned_{ld,st}, use the full load/store helpers.
This will allow the fast path to increase alignment to implement atomicity
while not immediately raising an alignment exception.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
tcg/ppc: Use full load/store helpers in user-only mode
Instead of using helper_unaligned_{ld,st}, use the full load/store helpers.
This will allow the fast path to increase alignment to implement atomicity
while not immediately raising an alignment exception.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
tcg/aarch64: Use full load/store helpers in user-only mode
Instead of using helper_unaligned_{ld,st}, use the full load/store helpers.
This will allow the fast path to increase alignment to implement atomicity
while not immediately raising an alignment exception.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
tcg/i386: Use full load/store helpers in user-only mode
Instead of using helper_unaligned_{ld,st}, use the full load/store helpers.
This will allow the fast path to increase alignment to implement atomicity
while not immediately raising an alignment exception.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
tcg/aarch64: Detect have_lse, have_lse2 for darwin
These features are present for Apple M1.
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Notice when the host has additional atomic instructions.
The new variables will also be used in generated code.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
With the current structure of cputlb.c, there is no difference
between the little-endian and big-endian entry points, aside
from the assert. Unify the pairs of functions.
Hoist the qemu_{ld,st}_helpers arrays to tcg.c.
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This field may be used to describe the precise atomicity requirements
of the guest, which may then be used to constrain the methods by which
it may be emulated by the host.
For instance, the AArch64 LDP (32-bit) instruction changes semantics
with ARMv8.4 LSE2, from
MO_64 | MO_ATOM_IFALIGN_PAIR
(64-bits, single-copy atomic only on 4 byte units,
nonatomic if not aligned by 4),
to
MO_64 | MO_ATOM_WITHIN16
(64-bits, single-copy atomic within a 16 byte block)
The former may be implemented with two 4 byte loads, or a single 8 byte
load if that happens to be efficient on the host. The latter may not
be implemented with two 4 byte loads and may also require a helper when
misaligned.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Merge tag 'pull-9p-20230516' of https://github.com/cschoenebeck/qemu into staging
9pfs: fixes
* Fixes for Xen, configure and a theoretical leak.
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# -----END PGP SIGNATURE-----
# gpg: Signature made Tue 16 May 2023 08:20:45 AM PDT
# gpg: using RSA key 96D8D110CF7AF8084F88590134C2B58765A47395
# gpg: issuer "qemu_oss@crudebyte.com"
# gpg: Good signature from "Christian Schoenebeck <qemu_oss@crudebyte.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: ECAB 1A45 4014 1413 BA38 4926 30DB 47C3 A012 D5F4
# Subkey fingerprint: 96D8 D110 CF7A F808 4F88 5901 34C2 B587 65A4 7395
* tag 'pull-9p-20230516' of https://github.com/cschoenebeck/qemu:
configure: make clear that VirtFS is 9p
9pfs/xen: Fix segfault on shutdown
tests/9p: fix potential leak in v9fs_rreaddir()
Don't require libcap-ng for virtfs support
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
projects / mirror_qemu.git / log