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bh=0bNxAjoblhVsFa7Cr7BGJOrI3UqBRI900v9WI//iqpQ=; b=ft68lsTy7tANFZkRPR8Q5qu9CL2O3CoQnHq2Z8Mw96Wtj+f+m9USvqDXnv04mrs17qhdUy eMPaxQHJ3ta3XcSQiXPM2r/MmOpS1gE4fJpq2rqM3IJTSZpG86ImqthYSCT3KIfbTqNJsc xw2xy8RS+EN0+dbrs4DmZeg4grHXuAY= X-MC-Unique: gAyWJPViPb-THNzsfaIJXQ-1 From: David Hildenbrand To: qemu-devel@nongnu.org Subject: [PATCH v3 09/12] util/mmap-alloc: Pass flags instead of separate bools to qemu_ram_mmap() Date: Mon, 8 Mar 2021 16:05:57 +0100 Message-Id: <20210308150600.14440-10-david@redhat.com> In-Reply-To: <20210308150600.14440-1-david@redhat.com> References: <20210308150600.14440-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=david@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=63.128.21.124; envelope-from=david@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.251, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Marcel Apfelbaum , Murilo Opsfelder Araujo , Cornelia Huck , Eduardo Habkost , "Michael S. Tsirkin" , Stefan Weil , David Hildenbrand , Richard Henderson , "Dr. David Alan Gilbert" , Peter Xu , Greg Kurz , Halil Pasic , Christian Borntraeger , Stefan Hajnoczi , Igor Mammedov , Thomas Huth , Paolo Bonzini , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Igor Kotrasinski , Juan Quintela Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" Let's introduce a new set of flags that abstract mmap logic and replace our current set of bools, to prepare for another flag. Signed-off-by: David Hildenbrand --- include/qemu/mmap-alloc.h | 17 +++++++++++------ softmmu/physmem.c | 8 +++++--- util/mmap-alloc.c | 14 +++++++------- util/oslib-posix.c | 3 ++- 4 files changed, 25 insertions(+), 17 deletions(-) diff --git a/include/qemu/mmap-alloc.h b/include/qemu/mmap-alloc.h index 456ff87df1..55664ea9f3 100644 --- a/include/qemu/mmap-alloc.h +++ b/include/qemu/mmap-alloc.h @@ -6,6 +6,15 @@ size_t qemu_fd_getpagesize(int fd); =20 size_t qemu_mempath_getpagesize(const char *mem_path); =20 +/* Map PROT_READ instead of PROT_READ|PROT_WRITE. */ +#define QEMU_RAM_MMAP_READONLY (1 << 0) + +/* Map MAP_SHARED instead of MAP_PRIVATE. */ +#define QEMU_RAM_MMAP_SHARED (1 << 1) + +/* Map MAP_SYNC|MAP_SHARED_VALIDATE if possible, fallback and warn otherwi= se. */ +#define QEMU_RAM_MMAP_PMEM (1 << 2) + /** * qemu_ram_mmap: mmap the specified file or device. * @@ -14,9 +23,7 @@ size_t qemu_mempath_getpagesize(const char *mem_path); * @size: the number of bytes to be mmaped * @align: if not zero, specify the alignment of the starting mapping add= ress; * otherwise, the alignment in use will be determined by QEMU. - * @readonly: true for a read-only mapping, false for read/write. - * @shared: map has RAM_SHARED flag. - * @is_pmem: map has RAM_PMEM flag. + * @mmap_flags: QEMU_RAM_MMAP_* flags * @map_offset: map starts at offset of map_offset from the start of fd * * Return: @@ -26,9 +33,7 @@ size_t qemu_mempath_getpagesize(const char *mem_path); void *qemu_ram_mmap(int fd, size_t size, size_t align, - bool readonly, - bool shared, - bool is_pmem, + uint32_t mmap_flags, off_t map_offset); =20 void qemu_ram_munmap(int fd, void *ptr, size_t size); diff --git a/softmmu/physmem.c b/softmmu/physmem.c index 8f90cb4cd2..ec7a382ccd 100644 --- a/softmmu/physmem.c +++ b/softmmu/physmem.c @@ -1533,6 +1533,7 @@ static void *file_ram_alloc(RAMBlock *block, off_t offset, Error **errp) { + uint32_t mmap_flags; void *area; =20 block->page_size =3D qemu_fd_getpagesize(fd); @@ -1580,9 +1581,10 @@ static void *file_ram_alloc(RAMBlock *block, perror("ftruncate"); } =20 - area =3D qemu_ram_mmap(fd, memory, block->mr->align, readonly, - block->flags & RAM_SHARED, block->flags & RAM_PME= M, - offset); + mmap_flags =3D readonly ? QEMU_RAM_MMAP_READONLY : 0; + mmap_flags |=3D (block->flags & RAM_SHARED) ? QEMU_RAM_MMAP_SHARED : 0; + mmap_flags |=3D (block->flags & RAM_PMEM) ? QEMU_RAM_MMAP_PMEM : 0; + area =3D qemu_ram_mmap(fd, memory, block->mr->align, mmap_flags, offse= t); if (area =3D=3D MAP_FAILED) { error_setg_errno(errp, errno, "unable to map backing store for guest RAM"); diff --git a/util/mmap-alloc.c b/util/mmap-alloc.c index 0e2bd7bc0e..bd8f7ab547 100644 --- a/util/mmap-alloc.c +++ b/util/mmap-alloc.c @@ -118,9 +118,12 @@ static void *mmap_reserve(size_t size, int fd) * Activate memory in a reserved region from the given fd (if any), to make * it accessible. */ -static void *mmap_activate(void *ptr, size_t size, int fd, bool readonly, - bool shared, bool is_pmem, off_t map_offset) +static void *mmap_activate(void *ptr, size_t size, int fd, uint32_t mmap_f= lags, + off_t map_offset) { + const bool readonly =3D mmap_flags & QEMU_RAM_MMAP_READONLY; + const bool shared =3D mmap_flags & QEMU_RAM_MMAP_SHARED; + const bool is_pmem =3D mmap_flags & QEMU_RAM_MMAP_PMEM; const int prot =3D PROT_READ | (readonly ? 0 : PROT_WRITE); int map_sync_flags =3D 0; int flags =3D MAP_FIXED; @@ -173,9 +176,7 @@ static inline size_t mmap_guard_pagesize(int fd) void *qemu_ram_mmap(int fd, size_t size, size_t align, - bool readonly, - bool shared, - bool is_pmem, + uint32_t mmap_flags, off_t map_offset) { const size_t guard_pagesize =3D mmap_guard_pagesize(fd); @@ -199,8 +200,7 @@ void *qemu_ram_mmap(int fd, =20 offset =3D QEMU_ALIGN_UP((uintptr_t)guardptr, align) - (uintptr_t)guar= dptr; =20 - ptr =3D mmap_activate(guardptr + offset, size, fd, readonly, shared, i= s_pmem, - map_offset); + ptr =3D mmap_activate(guardptr + offset, size, fd, mmap_flags, map_off= set); if (ptr =3D=3D MAP_FAILED) { munmap(guardptr, total); return MAP_FAILED; diff --git a/util/oslib-posix.c b/util/oslib-posix.c index 36820fec16..1d250416f1 100644 --- a/util/oslib-posix.c +++ b/util/oslib-posix.c @@ -229,8 +229,9 @@ void *qemu_memalign(size_t alignment, size_t size) /* alloc shared memory pages */ void *qemu_anon_ram_alloc(size_t size, uint64_t *alignment, bool shared) { + const uint32_t mmap_flags =3D shared ? QEMU_RAM_MMAP_SHARED : 0; size_t align =3D QEMU_VMALLOC_ALIGN; - void *ptr =3D qemu_ram_mmap(-1, size, align, false, shared, false, 0); + void *ptr =3D qemu_ram_mmap(-1, size, align, mmap_flags, 0); =20 if (ptr =3D=3D MAP_FAILED) { return NULL; --=20 2.29.2