diff options
| author | Xiaoyao Li <xiaoyao.li@intel.com> | 2024-03-20 03:39:02 -0500 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2024-04-23 17:35:25 +0200 |
| commit | 15f7a80c49cb3637f62fa37fa4a17da913bd91ff (patch) | |
| tree | 5eca41d2ef6737c92c5520327db1dcd1a4739650 /include | |
| parent | 0811baed49010a9b651b8029ab6b9828b09a884f (diff) | |
RAMBlock: Add support of KVM private guest memfd
Add KVM guest_memfd support to RAMBlock so both normal hva based memory
and kvm guest memfd based private memory can be associated in one RAMBlock.
Introduce new flag RAM_GUEST_MEMFD. When it's set, it calls KVM ioctl to
create private guest_memfd during RAMBlock setup.
Allocating a new RAM_GUEST_MEMFD flag to instruct the setup of guest memfd
is more flexible and extensible than simply relying on the VM type because
in the future we may have the case that not all the memory of a VM need
guest memfd. As a benefit, it also avoid getting MachineState in memory
subsystem.
Note, RAM_GUEST_MEMFD is supposed to be set for memory backends of
confidential guests, such as TDX VM. How and when to set it for memory
backends will be implemented in the following patches.
Introduce memory_region_has_guest_memfd() to query if the MemoryRegion has
KVM guest_memfd allocated.
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Message-ID: <20240320083945.991426-7-michael.roth@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/exec/memory.h | 20 | ||||
| -rw-r--r-- | include/exec/ram_addr.h | 2 | ||||
| -rw-r--r-- | include/exec/ramblock.h | 1 | ||||
| -rw-r--r-- | include/sysemu/kvm.h | 2 |
4 files changed, 21 insertions, 4 deletions
diff --git a/include/exec/memory.h b/include/exec/memory.h index 8626a355b3..679a847685 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -243,6 +243,9 @@ typedef struct IOMMUTLBEvent { /* RAM FD is opened read-only */ #define RAM_READONLY_FD (1 << 11) +/* RAM can be private that has kvm guest memfd backend */ +#define RAM_GUEST_MEMFD (1 << 12) + static inline void iommu_notifier_init(IOMMUNotifier *n, IOMMUNotify fn, IOMMUNotifierFlag flags, hwaddr start, hwaddr end, @@ -1307,7 +1310,8 @@ bool memory_region_init_ram_nomigrate(MemoryRegion *mr, * @name: Region name, becomes part of RAMBlock name used in migration stream * must be unique within any device * @size: size of the region. - * @ram_flags: RamBlock flags. Supported flags: RAM_SHARED, RAM_NORESERVE. + * @ram_flags: RamBlock flags. Supported flags: RAM_SHARED, RAM_NORESERVE, + * RAM_GUEST_MEMFD. * @errp: pointer to Error*, to store an error if it happens. * * Note that this function does not do anything to cause the data in the @@ -1369,7 +1373,7 @@ bool memory_region_init_resizeable_ram(MemoryRegion *mr, * (getpagesize()) will be used. * @ram_flags: RamBlock flags. Supported flags: RAM_SHARED, RAM_PMEM, * RAM_NORESERVE, RAM_PROTECTED, RAM_NAMED_FILE, RAM_READONLY, - * RAM_READONLY_FD + * RAM_READONLY_FD, RAM_GUEST_MEMFD * @path: the path in which to allocate the RAM. * @offset: offset within the file referenced by path * @errp: pointer to Error*, to store an error if it happens. @@ -1399,7 +1403,7 @@ bool memory_region_init_ram_from_file(MemoryRegion *mr, * @size: size of the region. * @ram_flags: RamBlock flags. Supported flags: RAM_SHARED, RAM_PMEM, * RAM_NORESERVE, RAM_PROTECTED, RAM_NAMED_FILE, RAM_READONLY, - * RAM_READONLY_FD + * RAM_READONLY_FD, RAM_GUEST_MEMFD * @fd: the fd to mmap. * @offset: offset within the file referenced by fd * @errp: pointer to Error*, to store an error if it happens. @@ -1723,6 +1727,16 @@ static inline bool memory_region_is_romd(MemoryRegion *mr) bool memory_region_is_protected(MemoryRegion *mr); /** + * memory_region_has_guest_memfd: check whether a memory region has guest_memfd + * associated + * + * Returns %true if a memory region's ram_block has valid guest_memfd assigned. + * + * @mr: the memory region being queried + */ +bool memory_region_has_guest_memfd(MemoryRegion *mr); + +/** * memory_region_get_iommu: check whether a memory region is an iommu * * Returns pointer to IOMMUMemoryRegion if a memory region is an iommu, diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h index de45ba7bc9..07c8f86375 100644 --- a/include/exec/ram_addr.h +++ b/include/exec/ram_addr.h @@ -110,7 +110,7 @@ long qemu_maxrampagesize(void); * @mr: the memory region where the ram block is * @ram_flags: RamBlock flags. Supported flags: RAM_SHARED, RAM_PMEM, * RAM_NORESERVE, RAM_PROTECTED, RAM_NAMED_FILE, RAM_READONLY, - * RAM_READONLY_FD + * RAM_READONLY_FD, RAM_GUEST_MEMFD * @mem_path or @fd: specify the backing file or device * @offset: Offset into target file * @errp: pointer to Error*, to store an error if it happens diff --git a/include/exec/ramblock.h b/include/exec/ramblock.h index 848915ea5b..459c8917de 100644 --- a/include/exec/ramblock.h +++ b/include/exec/ramblock.h @@ -41,6 +41,7 @@ struct RAMBlock { QLIST_HEAD(, RAMBlockNotifier) ramblock_notifiers; int fd; uint64_t fd_offset; + int guest_memfd; size_t page_size; /* dirty bitmap used during migration */ unsigned long *bmap; diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h index 594ae9b460..217f3fe17b 100644 --- a/include/sysemu/kvm.h +++ b/include/sysemu/kvm.h @@ -537,6 +537,8 @@ void kvm_mark_guest_state_protected(void); */ bool kvm_hwpoisoned_mem(void); +int kvm_create_guest_memfd(uint64_t size, uint64_t flags, Error **errp); + int kvm_set_memory_attributes_private(hwaddr start, uint64_t size); int kvm_set_memory_attributes_shared(hwaddr start, uint64_t size); |