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memory: Introduce memory_region_init_ram_guest_memfd()

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Introduce memory_region_init_ram_guest_memfd() to allocate private
guset memfd on the MemoryRegion initialization. It's for the use case of
TDVF, which must be private on TDX case.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Pankaj Gupta <pankaj.gupta@amd.com>
Message-ID: <20240530111643.1091816-4-pankaj.gupta@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Xiaoyao Li 2024-05-30 06:16:15 -05:00 committed by Paolo Bonzini
parent c1996992cc
commit a0aa6db7ce
2 changed files with 30 additions and 0 deletions
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6
include/exec/memory.h
View File

@ -1638,6 +1638,12 @@ bool memory_region_init_ram(MemoryRegion *mr,
uint64_t size,
Error **errp);
bool memory_region_init_ram_guest_memfd(MemoryRegion *mr,
Object *owner,
const char *name,
uint64_t size,
Error **errp);
/**
* memory_region_init_rom: Initialize a ROM memory region.
*

24
system/memory.c
View File

@ -3649,6 +3649,30 @@ bool memory_region_init_ram(MemoryRegion *mr,
return true;
}
bool memory_region_init_ram_guest_memfd(MemoryRegion *mr,
Object *owner,
const char *name,
uint64_t size,
Error **errp)
{
DeviceState *owner_dev;
if (!memory_region_init_ram_flags_nomigrate(mr, owner, name, size,
RAM_GUEST_MEMFD, errp)) {
return false;
}
/* This will assert if owner is neither NULL nor a DeviceState.
* We only want the owner here for the purposes of defining a
* unique name for migration. TODO: Ideally we should implement
* a naming scheme for Objects which are not DeviceStates, in
* which case we can relax this restriction.
*/
owner_dev = DEVICE(owner);
vmstate_register_ram(mr, owner_dev);
return true;
}
bool memory_region_init_rom(MemoryRegion *mr,
Object *owner,
const char *name,