| Message ID | 20230620195054.23929-2-lvivier@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | vhost-vdpa: skip TPM CRB memory section | expand |
On 6/20/23 15:50, Laurent Vivier wrote: > Commit 56918a126a ("memory: Add RAM_PROTECTED flag to skip IOMMU mappings") > has introduced the RAM_PROTECTED flag to denote "protected" memory. > > This flags is only used with qemu_ram_alloc_from_fd() for now. > > To be able to register memory region with this flag, define > memory_region_init_ram_protected() and declare the flag as valid in > qemu_ram_alloc_internal() and qemu_ram_alloc(). > > Signed-off-by: Laurent Vivier <lvivier@redhat.com> > --- > include/exec/memory.h | 33 +++++++++++++++++++++++++++++++++ > softmmu/memory.c | 33 +++++++++++++++++++++++++++------ > softmmu/physmem.c | 4 ++-- > 3 files changed, 62 insertions(+), 8 deletions(-) > > diff --git a/include/exec/memory.h b/include/exec/memory.h > index 47c2e0221c35..d8760015c381 100644 > --- a/include/exec/memory.h > +++ b/include/exec/memory.h > @@ -1520,6 +1520,39 @@ void memory_region_init_iommu(void *_iommu_mr, > const char *name, > uint64_t size); > > +/** > + * memory_region_init_ram_protected - Initialize RAM memory region. Accesses > + * into the region will modify memory > + * directly. > + * > + * The memory is created with the RAM_PROTECTED flag, for memory that > + * looks and acts like RAM but inaccessible via normal mechanisms, but is inaccessible > + * including DMA. > + * > + * @mr: the #MemoryRegion to be initialized > + * @owner: the object that tracks the region's reference count (must be > + * TYPE_DEVICE or a subclass of TYPE_DEVICE, or NULL) > + * @name: name of the memory region > + * @size: size of the region in bytes > + * @errp: pointer to Error*, to store an error if it happens. > + * > + * This function allocates RAM for a board model or device, and > + * arranges for it to be migrated (by calling vmstate_register_ram() > + * if @owner is a DeviceState, or vmstate_register_ram_global() if > + * @owner is NULL). > + * > + * TODO: Currently we restrict @owner to being either NULL (for > + * global RAM regions with no owner) or devices, so that we can > + * give the RAM block a unique name for migration purposes. > + * We should lift this restriction and allow arbitrary Objects. > + * If you pass a non-NULL non-device @owner then we will assert. > + */ > +void memory_region_init_ram_protected(MemoryRegion *mr, > + Object *owner, > + const char *name, > + uint64_t size, > + Error **errp); > + > /** > * memory_region_init_ram - Initialize RAM memory region. Accesses into the > * region will modify memory directly. > diff --git a/softmmu/memory.c b/softmmu/memory.c > index 7d9494ce7028..952c87277353 100644 > --- a/softmmu/memory.c > +++ b/softmmu/memory.c > @@ -3551,16 +3551,18 @@ void mtree_info(bool flatview, bool dispatch_tree, bool owner, bool disabled) > } > } > > -void memory_region_init_ram(MemoryRegion *mr, > - Object *owner, > - const char *name, > - uint64_t size, > - Error **errp) > +static void memory_region_init_ram_flags(MemoryRegion *mr, > + Object *owner, > + const char *name, > + uint64_t size, > + uint32_t ram_flags, > + Error **errp) > { > DeviceState *owner_dev; > Error *err = NULL; > > - memory_region_init_ram_nomigrate(mr, owner, name, size, &err); > + memory_region_init_ram_flags_nomigrate(mr, owner, name, size, ram_flags, > + &err); > if (err) { > error_propagate(errp, err); > return; > @@ -3575,6 +3577,25 @@ void memory_region_init_ram(MemoryRegion *mr, > vmstate_register_ram(mr, owner_dev); > } > > +void memory_region_init_ram_protected(MemoryRegion *mr, > + Object *owner, > + const char *name, > + uint64_t size, > + Error **errp) > +{ > + memory_region_init_ram_flags(mr, owner, name, size, RAM_PROTECTED, > + errp); > +} > + > +void memory_region_init_ram(MemoryRegion *mr, > + Object *owner, > + const char *name, > + uint64_t size, > + Error **errp) > +{ > + memory_region_init_ram_flags(mr, owner, name, size, 0, errp); > +} > + > void memory_region_init_rom(MemoryRegion *mr, > Object *owner, > const char *name, > diff --git a/softmmu/physmem.c b/softmmu/physmem.c > index 6bdd944fe880..bf66c81e7255 100644 > --- a/softmmu/physmem.c > +++ b/softmmu/physmem.c > @@ -1978,7 +1978,7 @@ RAMBlock *qemu_ram_alloc_internal(ram_addr_t size, ram_addr_t max_size, > Error *local_err = NULL; > > assert((ram_flags & ~(RAM_SHARED | RAM_RESIZEABLE | RAM_PREALLOC | > - RAM_NORESERVE)) == 0); > + RAM_NORESERVE | RAM_PROTECTED)) == 0); > assert(!host ^ (ram_flags & RAM_PREALLOC)); > > size = HOST_PAGE_ALIGN(size); > @@ -2012,7 +2012,7 @@ RAMBlock *qemu_ram_alloc_from_ptr(ram_addr_t size, void *host, > RAMBlock *qemu_ram_alloc(ram_addr_t size, uint32_t ram_flags, > MemoryRegion *mr, Error **errp) > { > - assert((ram_flags & ~(RAM_SHARED | RAM_NORESERVE)) == 0); > + assert((ram_flags & ~(RAM_SHARED | RAM_NORESERVE | RAM_PROTECTED)) == 0); > return qemu_ram_alloc_internal(size, size, NULL, NULL, ram_flags, mr, errp); > } > Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
On 20.06.23 21:50, Laurent Vivier wrote: > Commit 56918a126a ("memory: Add RAM_PROTECTED flag to skip IOMMU mappings") > has introduced the RAM_PROTECTED flag to denote "protected" memory. > > This flags is only used with qemu_ram_alloc_from_fd() for now. > > To be able to register memory region with this flag, define > memory_region_init_ram_protected() and declare the flag as valid in > qemu_ram_alloc_internal() and qemu_ram_alloc(). > > Signed-off-by: Laurent Vivier <lvivier@redhat.com> > --- > include/exec/memory.h | 33 +++++++++++++++++++++++++++++++++ > softmmu/memory.c | 33 +++++++++++++++++++++++++++------ > softmmu/physmem.c | 4 ++-- > 3 files changed, 62 insertions(+), 8 deletions(-) > > diff --git a/include/exec/memory.h b/include/exec/memory.h > index 47c2e0221c35..d8760015c381 100644 > --- a/include/exec/memory.h > +++ b/include/exec/memory.h > @@ -1520,6 +1520,39 @@ void memory_region_init_iommu(void *_iommu_mr, > const char *name, > uint64_t size); > > +/** > + * memory_region_init_ram_protected - Initialize RAM memory region. Accesses > + * into the region will modify memory > + * directly. > + * > + * The memory is created with the RAM_PROTECTED flag, for memory that > + * looks and acts like RAM but inaccessible via normal mechanisms, > + * including DMA. > + * > + * @mr: the #MemoryRegion to be initialized > + * @owner: the object that tracks the region's reference count (must be > + * TYPE_DEVICE or a subclass of TYPE_DEVICE, or NULL) > + * @name: name of the memory region > + * @size: size of the region in bytes > + * @errp: pointer to Error*, to store an error if it happens. > + * > + * This function allocates RAM for a board model or device, and > + * arranges for it to be migrated (by calling vmstate_register_ram() > + * if @owner is a DeviceState, or vmstate_register_ram_global() if > + * @owner is NULL). > + * > + * TODO: Currently we restrict @owner to being either NULL (for > + * global RAM regions with no owner) or devices, so that we can > + * give the RAM block a unique name for migration purposes. > + * We should lift this restriction and allow arbitrary Objects. > + * If you pass a non-NULL non-device @owner then we will assert. > + */ > +void memory_region_init_ram_protected(MemoryRegion *mr, > + Object *owner, > + const char *name, > + uint64_t size, > + Error **errp); > + > /** > * memory_region_init_ram - Initialize RAM memory region. Accesses into the > * region will modify memory directly. > diff --git a/softmmu/memory.c b/softmmu/memory.c > index 7d9494ce7028..952c87277353 100644 > --- a/softmmu/memory.c > +++ b/softmmu/memory.c > @@ -3551,16 +3551,18 @@ void mtree_info(bool flatview, bool dispatch_tree, bool owner, bool disabled) > } > } > > -void memory_region_init_ram(MemoryRegion *mr, > - Object *owner, > - const char *name, > - uint64_t size, > - Error **errp) > +static void memory_region_init_ram_flags(MemoryRegion *mr, > + Object *owner, > + const char *name, > + uint64_t size, > + uint32_t ram_flags, > + Error **errp) > { > DeviceState *owner_dev; > Error *err = NULL; > > - memory_region_init_ram_nomigrate(mr, owner, name, size, &err); > + memory_region_init_ram_flags_nomigrate(mr, owner, name, size, ram_flags, > + &err); > if (err) { > error_propagate(errp, err); > return; > @@ -3575,6 +3577,25 @@ void memory_region_init_ram(MemoryRegion *mr, > vmstate_register_ram(mr, owner_dev); > } > > +void memory_region_init_ram_protected(MemoryRegion *mr, > + Object *owner, > + const char *name, > + uint64_t size, > + Error **errp) > +{ > + memory_region_init_ram_flags(mr, owner, name, size, RAM_PROTECTED, > + errp); > +} > + > +void memory_region_init_ram(MemoryRegion *mr, > + Object *owner, > + const char *name, > + uint64_t size, > + Error **errp) > +{ > + memory_region_init_ram_flags(mr, owner, name, size, 0, errp); > +} > + > void memory_region_init_rom(MemoryRegion *mr, > Object *owner, > const char *name, > diff --git a/softmmu/physmem.c b/softmmu/physmem.c > index 6bdd944fe880..bf66c81e7255 100644 > --- a/softmmu/physmem.c > +++ b/softmmu/physmem.c > @@ -1978,7 +1978,7 @@ RAMBlock *qemu_ram_alloc_internal(ram_addr_t size, ram_addr_t max_size, > Error *local_err = NULL; > > assert((ram_flags & ~(RAM_SHARED | RAM_RESIZEABLE | RAM_PREALLOC | > - RAM_NORESERVE)) == 0); > + RAM_NORESERVE | RAM_PROTECTED)) == 0); > assert(!host ^ (ram_flags & RAM_PREALLOC)); > > size = HOST_PAGE_ALIGN(size); > @@ -2012,7 +2012,7 @@ RAMBlock *qemu_ram_alloc_from_ptr(ram_addr_t size, void *host, > RAMBlock *qemu_ram_alloc(ram_addr_t size, uint32_t ram_flags, > MemoryRegion *mr, Error **errp) > { > - assert((ram_flags & ~(RAM_SHARED | RAM_NORESERVE)) == 0); > + assert((ram_flags & ~(RAM_SHARED | RAM_NORESERVE | RAM_PROTECTED)) == 0); > return qemu_ram_alloc_internal(size, size, NULL, NULL, ram_flags, mr, errp); > } > Reviewed-by: David Hildenbrand <david@redhat.com>
On Tue, 20 Jun 2023 at 20:51, Laurent Vivier <lvivier@redhat.com> wrote: > > Commit 56918a126a ("memory: Add RAM_PROTECTED flag to skip IOMMU mappings") > has introduced the RAM_PROTECTED flag to denote "protected" memory. > > This flags is only used with qemu_ram_alloc_from_fd() for now. > > To be able to register memory region with this flag, define > memory_region_init_ram_protected() and declare the flag as valid in > qemu_ram_alloc_internal() and qemu_ram_alloc(). > > Signed-off-by: Laurent Vivier <lvivier@redhat.com> > --- > include/exec/memory.h | 33 +++++++++++++++++++++++++++++++++ > softmmu/memory.c | 33 +++++++++++++++++++++++++++------ > softmmu/physmem.c | 4 ++-- > 3 files changed, 62 insertions(+), 8 deletions(-) > > diff --git a/include/exec/memory.h b/include/exec/memory.h > index 47c2e0221c35..d8760015c381 100644 > --- a/include/exec/memory.h > +++ b/include/exec/memory.h > @@ -1520,6 +1520,39 @@ void memory_region_init_iommu(void *_iommu_mr, > const char *name, > uint64_t size); > > +/** > + * memory_region_init_ram_protected - Initialize RAM memory region. Accesses > + * into the region will modify memory > + * directly. > + * > + * The memory is created with the RAM_PROTECTED flag, for memory that > + * looks and acts like RAM but inaccessible via normal mechanisms, > + * including DMA. This doesn't really tell me why you might want to mark a region as RAM_PROTECTED. What kind of memory region is not DMAable to? What are "normal mechanisms" here? What are the "non-normal mechanisms" that you *can* use on this memory region? At the moment we only seem to use RAM_PROTECTED for the SGX EPC memory backend. The commit message adding that flag is pretty vague about what it means... thanks -- PMM
diff --git a/include/exec/memory.h b/include/exec/memory.h index 47c2e0221c35..d8760015c381 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -1520,6 +1520,39 @@ void memory_region_init_iommu(void *_iommu_mr, const char *name, uint64_t size); +/** + * memory_region_init_ram_protected - Initialize RAM memory region. Accesses + * into the region will modify memory + * directly. + * + * The memory is created with the RAM_PROTECTED flag, for memory that + * looks and acts like RAM but inaccessible via normal mechanisms, + * including DMA. + * + * @mr: the #MemoryRegion to be initialized + * @owner: the object that tracks the region's reference count (must be + * TYPE_DEVICE or a subclass of TYPE_DEVICE, or NULL) + * @name: name of the memory region + * @size: size of the region in bytes + * @errp: pointer to Error*, to store an error if it happens. + * + * This function allocates RAM for a board model or device, and + * arranges for it to be migrated (by calling vmstate_register_ram() + * if @owner is a DeviceState, or vmstate_register_ram_global() if + * @owner is NULL). + * + * TODO: Currently we restrict @owner to being either NULL (for + * global RAM regions with no owner) or devices, so that we can + * give the RAM block a unique name for migration purposes. + * We should lift this restriction and allow arbitrary Objects. + * If you pass a non-NULL non-device @owner then we will assert. + */ +void memory_region_init_ram_protected(MemoryRegion *mr, + Object *owner, + const char *name, + uint64_t size, + Error **errp); + /** * memory_region_init_ram - Initialize RAM memory region. Accesses into the * region will modify memory directly. diff --git a/softmmu/memory.c b/softmmu/memory.c index 7d9494ce7028..952c87277353 100644 --- a/softmmu/memory.c +++ b/softmmu/memory.c @@ -3551,16 +3551,18 @@ void mtree_info(bool flatview, bool dispatch_tree, bool owner, bool disabled) } } -void memory_region_init_ram(MemoryRegion *mr, - Object *owner, - const char *name, - uint64_t size, - Error **errp) +static void memory_region_init_ram_flags(MemoryRegion *mr, + Object *owner, + const char *name, + uint64_t size, + uint32_t ram_flags, + Error **errp) { DeviceState *owner_dev; Error *err = NULL; - memory_region_init_ram_nomigrate(mr, owner, name, size, &err); + memory_region_init_ram_flags_nomigrate(mr, owner, name, size, ram_flags, + &err); if (err) { error_propagate(errp, err); return; @@ -3575,6 +3577,25 @@ void memory_region_init_ram(MemoryRegion *mr, vmstate_register_ram(mr, owner_dev); } +void memory_region_init_ram_protected(MemoryRegion *mr, + Object *owner, + const char *name, + uint64_t size, + Error **errp) +{ + memory_region_init_ram_flags(mr, owner, name, size, RAM_PROTECTED, + errp); +} + +void memory_region_init_ram(MemoryRegion *mr, + Object *owner, + const char *name, + uint64_t size, + Error **errp) +{ + memory_region_init_ram_flags(mr, owner, name, size, 0, errp); +} + void memory_region_init_rom(MemoryRegion *mr, Object *owner, const char *name, diff --git a/softmmu/physmem.c b/softmmu/physmem.c index 6bdd944fe880..bf66c81e7255 100644 --- a/softmmu/physmem.c +++ b/softmmu/physmem.c @@ -1978,7 +1978,7 @@ RAMBlock *qemu_ram_alloc_internal(ram_addr_t size, ram_addr_t max_size, Error *local_err = NULL; assert((ram_flags & ~(RAM_SHARED | RAM_RESIZEABLE | RAM_PREALLOC | - RAM_NORESERVE)) == 0); + RAM_NORESERVE | RAM_PROTECTED)) == 0); assert(!host ^ (ram_flags & RAM_PREALLOC)); size = HOST_PAGE_ALIGN(size); @@ -2012,7 +2012,7 @@ RAMBlock *qemu_ram_alloc_from_ptr(ram_addr_t size, void *host, RAMBlock *qemu_ram_alloc(ram_addr_t size, uint32_t ram_flags, MemoryRegion *mr, Error **errp) { - assert((ram_flags & ~(RAM_SHARED | RAM_NORESERVE)) == 0); + assert((ram_flags & ~(RAM_SHARED | RAM_NORESERVE | RAM_PROTECTED)) == 0); return qemu_ram_alloc_internal(size, size, NULL, NULL, ram_flags, mr, errp); }
Commit 56918a126a ("memory: Add RAM_PROTECTED flag to skip IOMMU mappings") has introduced the RAM_PROTECTED flag to denote "protected" memory. This flags is only used with qemu_ram_alloc_from_fd() for now. To be able to register memory region with this flag, define memory_region_init_ram_protected() and declare the flag as valid in qemu_ram_alloc_internal() and qemu_ram_alloc(). Signed-off-by: Laurent Vivier <lvivier@redhat.com> --- include/exec/memory.h | 33 +++++++++++++++++++++++++++++++++ softmmu/memory.c | 33 +++++++++++++++++++++++++++------ softmmu/physmem.c | 4 ++-- 3 files changed, 62 insertions(+), 8 deletions(-)