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2023-10-27target/arm: Move feature test functions to their own headerPeter Maydell1-0/+4
The feature test functions isar_feature_*() now take up nearly a thousand lines in target/arm/cpu.h. This header file is included by a lot of source files, most of which don't need these functions. Move the feature test functions to their own header file. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20231024163510.2972081-2-peter.maydell@linaro.org
2023-10-18linux-user: Propagate failure in mmap_reserve_or_unmap back to target_munmapRichard Henderson1-13/+17
Do not assert success, but return any failure received. Additionally, fix the method of earlier error return in target_munmap. Reported-by: Andreas Schwab <schwab@suse.de> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-10-06linux-user/mmap.c: clean up local variable shadowingLaurent Vivier1-3/+3
Fix following warnings: .../linux-user/mmap.c: In function 'target_mremap': .../linux-user/mmap.c:913:13: warning: declaration of 'prot' shadows a previous local [-Wshadow=compatible-local] 913 | int prot = 0; | ^~~~ ../../../Projects/qemu/linux-user/mmap.c:871:9: note: shadowed declaration is here 871 | int prot; | ^~~~ Signed-off-by: Laurent Vivier <laurent@vivier.eu> Message-ID: <20230925151029.461358-3-laurent@vivier.eu> Reviewed-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
2023-09-01linux-user: Track shm regions with an interval treeRichard Henderson1-28/+53
Remove the fixed size shm_regions[] array. Remove references when other mappings completely remove or replace a region. Tested-by: Helge Deller <deller@gmx.de> Reviewed-by: Helge Deller <deller@gmx.de> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-09-01linux-user: Fix shmdtRichard Henderson1-3/+14
If the shm region is not mapped at shmaddr, EINVAL. Do not unmap the region until the syscall succeeds. Use mmap_reserve_or_unmap to preserve reserved_va semantics. Tested-by: Helge Deller <deller@gmx.de> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-09-01linux-user: Use WITH_MMAP_LOCK_GUARD in target_{shmat,shmdt}Richard Henderson1-52/+46
Move the CF_PARALLEL setting outside of the mmap lock. Tested-by: Helge Deller <deller@gmx.de> Reviewed-by: Helge Deller <deller@gmx.de> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-09-01linux-user: Move shmat and shmdt implementations to mmap.cRichard Henderson1-0/+138
Rename from do_* to target_*. Fix some minor checkpatch errors. Tested-by: Helge Deller <deller@gmx.de> Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Warner Losh <imp@bsdimp.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-08-08linux-user: Define ELF_ET_DYN_BASE in $guest/target_mman.hRichard Henderson1-0/+1
Copy each guest kernel's default value, then bound it against reserved_va or the host address space. Tested-by: Helge Deller <deller@gmx.de> Reviewed-by: Helge Deller <deller@gmx.de> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-08-08linux-user: Adjust task_unmapped_base for reserved_vaRichard Henderson1-15/+3
Ensure that the chosen values for mmap_next_start and task_unmapped_base are within the guest address space. Tested-by: Helge Deller <deller@gmx.de> Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-08-06linux-user: Remove last_brkRichard Henderson1-2/+0
This variable is unused. Reviewed-by: Helge Deller <deller@gmx.de> Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-08-06linux-user: Fix MAP_FIXED_NOREPLACE on old kernelsAkihiko Odaki1-5/+17
The man page states: > Note that older kernels which do not recognize the MAP_FIXED_NOREPLACE > flag will typically (upon detecting a collision with a preexisting > mapping) fall back to a “non-MAP_FIXED” type of behavior: they will > return an address that is different from the requested address. > Therefore, backward-compatible software should check the returned > address against the requested address. https://man7.org/linux/man-pages/man2/mmap.2.html Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com> Message-Id: <20230802071754.14876-3-akihiko.odaki@daynix.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-08-06linux-user: Unset MAP_FIXED_NOREPLACE for hostAkihiko Odaki1-5/+20
Passing MAP_FIXED_NOREPLACE to host will fail for reserved_va because the address space is reserved with mmap. Replace it with MAP_FIXED in that case. Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com> Message-Id: <20230802071754.14876-2-akihiko.odaki@daynix.com> [rth: Expand inline commentary.] Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-07-23include/exec: Add WITH_MMAP_LOCK_GUARDRichard Henderson1-0/+1
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-07-15linux-user: Simplify target_madviseRichard Henderson1-15/+4
The trivial length 0 check can be moved up, simplifying some of the other cases. The end < start test is handled by guest_range_valid_untagged. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20230707204054.8792-27-richard.henderson@linaro.org>
2023-07-15linux-user: Remove can_passthrough_madviseRichard Henderson1-21/+3
Use page_check_range instead, which uses the interval tree instead of checking each page individually. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20230707204054.8792-26-richard.henderson@linaro.org>
2023-07-15linux-user: Simplify target_munmapRichard Henderson1-43/+4
All of the guest to host page adjustment is handled by mmap_reserve_or_unmap; there is no need to duplicate that. There are no failure modes for munmap after alignment and guest address range have been validated. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20230707204054.8792-23-richard.henderson@linaro.org>
2023-07-15linux-user: Rename mmap_reserve to mmap_reserve_or_unmapRichard Henderson1-13/+16
If !reserved_va, munmap instead and assert success. Update all callers. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20230707204054.8792-22-richard.henderson@linaro.org>
2023-07-15linux-user: Rewrite mmap_reserveRichard Henderson1-26/+42
Use 'last' variables instead of 'end' variables; be careful about avoiding overflow. Assert that the mmap succeeded. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20230707204054.8792-21-richard.henderson@linaro.org>
2023-07-15linux-user: Use 'last' instead of 'end' in target_mmapRichard Henderson1-22/+23
Complete the transition within the mmap functions to a formulation that does not overflow at the end of the address space. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Message-Id: <20230707204054.8792-20-richard.henderson@linaro.org>
2023-07-15linux-user: Use page_find_range_empty for mmap_find_vma_reservedRichard Henderson1-46/+6
Use the interval tree to find empty space, rather than probing each page in turn. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20230707204054.8792-19-richard.henderson@linaro.org>
2023-07-15linux-user: Rewrite mmap_fragRichard Henderson1-59/+60
Use 'last' variables instead of 'end' variables. Always zero MAP_ANONYMOUS fragments, which we previously failed to do if they were not writable; early exit in case we allocate a new page from the kernel, known zeros. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20230707204054.8792-16-richard.henderson@linaro.org>
2023-07-15linux-user: Rewrite target_mprotectRichard Henderson1-38/+66
Use 'last' variables instead of 'end' variables. When host page size > guest page size, detect when adjacent host pages have the same protection and merge that expanded host range into fewer syscalls. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20230707204054.8792-15-richard.henderson@linaro.org>
2023-07-15linux-user: Widen target_mmap offset argument to off_tRichard Henderson1-6/+8
We build with _FILE_OFFSET_BITS=64, so off_t = off64_t = uint64_t. With an extra cast, this fixes emulation of mmap2, which could overflow the computation of the full value of offset. Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20230707204054.8792-14-richard.henderson@linaro.org>
2023-07-15linux-user: Split out target_to_host_protRichard Henderson1-34/+44
Split out from validate_prot_to_pageflags, as there is not one single host_prot for the entire range. We need to adjust prot for every host page that overlaps multiple guest pages. Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20230707204054.8792-13-richard.henderson@linaro.org>
2023-07-15linux-user: Implement MAP_FIXED_NOREPLACERichard Henderson1-3/+11
Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20230707204054.8792-12-richard.henderson@linaro.org>
2023-07-15linux-user: Fix formatting of mmap.cRichard Henderson1-77/+122
Fix all checkpatch.pl errors within mmap.c. 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> Message-Id: <20230707204054.8792-5-richard.henderson@linaro.org>
2023-07-01linux-user: Avoid mmap of the last byte of the reserved_vaRichard Henderson1-4/+10
There is an overflow problem in mmap_find_vma_reserved: when reserved_va == UINT32_MAX, end may overflow to 0. Rather than a larger rewrite at this time, simply avoid the final byte of the VA, which avoids searching the final page, which avoids the overflow. Cc: qemu-stable@nongnu.org Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1741 Fixes: 95059f9c ("include/exec: Change reserved_va semantics to last byte") Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Tested-by: Michael Tokarev <mjt@tls.msk.ru> Reviewed-by: Michael Tokarev <mjt@tls.msk.ru> Message-Id: <20230629080835.71371-1-richard.henderson@linaro.org>
2023-03-28include/exec: Change reserved_va semantics to last byteRichard Henderson1-2/+2
Change the semantics to be the last byte of the guest va, rather than the following byte. This avoids some overflow conditions. Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-03-28accel/tcg: Pass last not end to page_reset_target_dataRichard Henderson1-1/+1
Pass the address of the last byte to be changed, rather than the first address past the last byte. This avoids overflow when the last page of the address space is involved. Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-03-28accel/tcg: Pass last not end to page_set_flagsRichard Henderson1-8/+8
Pass the address of the last byte to be changed, rather than the first address past the last byte. This avoids overflow when the last page of the address space is involved. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1528 Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-02-03linux-user: Add emulation for MADV_WIPEONFORK and MADV_KEEPONFORK in madvise()Helge Deller1-13/+43
Both parameters have a different value on the parisc platform, so first translate the target value into a host value for usage in the native madvise() syscall. Those parameters are often used by security sensitive applications (e.g. tor browser, boringssl, ...) which expect the call to return a proper return code on failure, so return -EINVAL if qemu fails to forward the syscall to the host OS. While touching this code, enhance the comments about MADV_DONTNEED. Tested with testcase of tor browser when running hppa-linux guest on x86-64 host. Signed-off-by: Helge Deller <deller@gmx.de> Acked-by: Ilya Leoshkevich <iii@linux.ibm.com> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Message-Id: <Y5iwTaydU7i66K/i@p100> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2022-10-26accel/tcg: Call tb_invalidate_phys_page for PAGE_RESETRichard Henderson1-4/+0
When PAGE_RESET is set, we are replacing pages with new content, which means that we need to invalidate existing cached data, such as TranslationBlocks. Perform the reset invalidate while we're doing other invalidates, which allows us to remove the separate invalidates from the user-only mmap/munmap/mprotect routines. In addition, restrict invalidation to PAGE_EXEC pages. Since cdf713085131, we have validated PAGE_EXEC is present before translation, which means we can assume that if the bit is not present, there are no translations to invalidate. Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2022-09-27linux-user/hppa: Allow PROT_GROWSUP and PROT_GROWSDOWN in mprotect()Helge Deller1-0/+2
The hppa platform uses an upwards-growing stack and required in Linux kernels < 5.18 an executable stack for signal processing. For that some executables and libraries are marked to have an executable stack, for which glibc uses the mprotect() syscall to mark the stack like this: mprotect(xfa000000,4096,PROT_EXEC|PROT_READ|PROT_WRITE|PROT_GROWSUP). Currently qemu will return -TARGET_EINVAL for this syscall because of the checks in validate_prot_to_pageflags(), which doesn't allow the PROT_GROWSUP or PROT_GROWSDOWN flags and thus triggers this error in the guest: error while loading shared libraries: libc.so.6: cannot enable executable stack as shared object requires: Invalid argument Allow mprotect() to handle both flags and thus fix the guest. The glibc tst-execstack testcase can be used to reproduce the issue. Signed-off-by: Helge Deller <deller@gmx.de> Message-Id: <20220924114501.21767-7-deller@gmx.de> [lvivier: s/elif TARGET_HPPA/elif defined(TARGET_HPPA)/] Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2022-09-27linux-user: Passthrough MADV_DONTNEED for certain file mappingsIlya Leoshkevich1-5/+22
This is a follow-up for commit 892a4f6a750a ("linux-user: Add partial support for MADV_DONTNEED"), which added passthrough for anonymous mappings. File mappings can be handled in a similar manner. In order to do that, mark pages, for which mmap() was passed through, with PAGE_PASSTHROUGH, and then allow madvise() passthrough for these pages. Drop the explicit PAGE_ANON check, since anonymous mappings are expected to have PAGE_PASSTHROUGH anyway. Add PAGE_PASSTHROUGH to PAGE_STICKY in order to keep it on mprotect(). Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20220725125043.43048-1-iii@linux.ibm.com> Message-Id: <20220906000839.1672934-5-iii@linux.ibm.com> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2022-09-27linux-user: Fix madvise(MADV_DONTNEED) on alphaIlya Leoshkevich1-1/+2
MADV_DONTNEED has a different value on alpha, compared to all the other architectures. Fix by using TARGET_MADV_DONTNEED instead of MADV_DONTNEED. Fixes: 892a4f6a750a ("linux-user: Add partial support for MADV_DONTNEED") Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20220906000839.1672934-3-iii@linux.ibm.com> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2022-09-27linux-user/hppa: Set TASK_UNMAPPED_BASE to 0xfa000000 for hppa archHelge Deller1-0/+4
On the parisc architecture the stack grows upwards. Move the TASK_UNMAPPED_BASE to high memory area as it's done by the kernel on physical machines. Signed-off-by: Helge Deller <deller@gmx.de> Message-Id: <20220918194555.83535-9-deller@gmx.de> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2022-09-06linux-user: Clear translations on mprotect()Ilya Leoshkevich1-2/+4
Currently it's possible to execute pages that do not have PAGE_EXEC if there is an existing translation block. Fix by invalidating TBs that touch the affected pages. Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Message-Id: <20220817150506.592862-2-iii@linux.ibm.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2022-08-11linux-user/aarch64: Reset target data on MADV_DONTNEEDVitaly Buka1-0/+3
aarch64 stores MTE tags in target_date, and they should be reset by MADV_DONTNEED. Signed-off-by: Vitaly Buka <vitalybuka@google.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20220711220028.2467290-1-vitalybuka@google.com> [lv: fix code style issues] Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2022-07-29linux-user: Do not treat madvise()'s advice as a bitmaskIlya Leoshkevich1-1/+1
Advice is enum, not flags. Doing (advice & MADV_DONTNEED) also matches e.g. MADV_MERGEABLE. Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Message-Id: <20220725134100.128035-1-iii@linux.ibm.com> Fixes: 892a4f6a750a ("linux-user: Add partial support for MADV_DONTNEED") Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2022-06-24linux-user: Add partial support for MADV_DONTNEEDIlya Leoshkevich1-0/+64
Currently QEMU ignores madvise(MADV_DONTNEED), which break apps that rely on this for zeroing out memory [1]. Improve the situation by doing a passthrough when the range in question is a host-page-aligned anonymous mapping. This is based on the patches from Simon Hausmann [2] and Chris Fallin [3]. The structure is taken from Simon's patch. The PAGE_MAP_ANONYMOUS bits are superseded by commit 26bab757d41b ("linux-user: Introduce PAGE_ANON"). In the end the patch acts like the one from Chris: we either pass-through the entire syscall, or do nothing, since doing this only partially would not help the affected applications much. Finally, add some extra checks to match the behavior of the Linux kernel [4]. [1] https://gitlab.com/qemu-project/qemu/-/issues/326 [2] https://patchew.org/QEMU/20180827084037.25316-1-simon.hausmann@qt.io/ [3] https://github.com/bytecodealliance/wasmtime/blob/v0.37.0/ci/qemu-madvise.patch [4] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/mm/madvise.c?h=v5.19-rc3#n1368 Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Message-Id: <20220621144205.158452-1-iii@linux.ibm.com> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2022-04-20linux-user: Expand log_page_dump inlineRichard Henderson1-1/+6
We have extra stuff to log at the same time. Hoist the qemu_log_lock/unlock to the caller and use fprintf. Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20220417183019.755276-23-richard.henderson@linaro.org>
2022-04-06Replace qemu_real_host_page variables with inlined functionsMarc-André Lureau1-1/+1
Replace the global variables with inlined helper functions. getpagesize() is very likely annotated with a "const" function attribute (at least with glibc), and thus optimization should apply even better. This avoids the need for a constructor initialization too. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20220323155743.1585078-12-marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-09-13linux-user: Split linux-user internals out of qemu.hPeter Maydell1-0/+1
qemu.h is included in various non-linux-user files (which mostly want the TaskState struct and the functions for doing usermode access to guest addresses like lock_user(), unlock_user(), get_user*(), etc). Split out the parts that are only used in linux-user itself into a new user-internals.h. This leaves qemu.h with basically three things: * the definition of the TaskState struct * the user-access functions and macros * do_brk() all of which are needed by code outside linux-user that includes qemu.h. The addition of all the extra #include lines was done with sed -i '/include.*qemu\.h/a #include "user-internals.h"' $(git grep -l 'include.*qemu\.h' linux-user) (and then undoing the change to fpa11.h). Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20210908154405.15417-8-peter.maydell@linaro.org> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2021-09-13linux-user: Split mmap prototypes into user-mmap.hPeter Maydell1-0/+1
Split out the mmap prototypes into a new header user-mmap.h which we only include where required. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20210908154405.15417-6-peter.maydell@linaro.org> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2021-06-15linux-user: Set CF_PARALLEL when mapping shared memoryRichard Henderson1-0/+14
Signal the translator to use host atomic instructions for guest operations, insofar as it is possible. This is the best we can do to allow the guest to interact atomically with other processes. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/121 Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20210612060828.695332-1-richard.henderson@linaro.org> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2021-02-16linux-user/aarch64: Implement PROT_MTERichard Henderson1-8/+14
Remember the PROT_MTE bit as PAGE_MTE/PAGE_TARGET_2. Otherwise this does not yet have effect. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20210212184902.1251044-25-richard.henderson@linaro.org Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-02-16exec: Rename guest_{addr,range}_valid to *_untaggedRichard Henderson1-7/+7
The places that use these are better off using untagged addresses, so do not provide a tagged versions. Rename to make it clear about the address type. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20210212184902.1251044-16-richard.henderson@linaro.org Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-02-16exec: Use cpu_untagged_addr in g2h; split out g2h_untaggedRichard Henderson1-21/+24
Use g2h_untagged in contexts that have no cpu, e.g. the binary loaders that operate before the primary cpu is created. As a colollary, target_mmap and friends must use untagged addresses, since they are used by the loaders. Use g2h_untagged on values returned from target_mmap, as the kernel never applies a tag itself. Use g2h_untagged on all pc values. The only current user of tags, aarch64, removes tags from code addresses upon branch, so "pc" is always untagged. Use g2h with the cpu context on hand wherever possible. Use g2h_untagged in lock_user, which will be updated soon. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20210212184902.1251044-13-richard.henderson@linaro.org Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-02-16linux-user: Introduce PAGE_ANONRichard Henderson1-0/+3
Record whether the backing page is anonymous, or if it has file backing. This will allow us to get close to the Linux AArch64 ABI for MTE, which allows tag memory only on ram-backed VMAs. The real ABI allows tag memory on files, when those files are on ram-backed filesystems, such as tmpfs. We will not be able to implement that in QEMU linux-user. Thankfully, anonymous memory for malloc arenas is the primary consumer of this feature, so this restricted version should still be of use. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20210212184902.1251044-3-richard.henderson@linaro.org Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-02-16tcg: Introduce target-specific page data for user-onlyRichard Henderson1-1/+3
This data can be allocated by page_alloc_target_data() and released by page_set_flags(start, end, prot | PAGE_RESET). This data will be used to hold tag memory for AArch64 MTE. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20210212184902.1251044-2-richard.henderson@linaro.org Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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