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KVM: Add KVM_PRE_FAULT_MEMORY vcpu ioctl to pre-populate guest memory

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Add a new ioctl KVM_PRE_FAULT_MEMORY in the KVM common code. It iterates on the
memory range and calls the arch-specific function.  The implementation is
optional and enabled by a Kconfig symbol.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Message-ID: <819322b8f25971f2b9933bfa4506e618508ad782.1712785629.git.isaku.yamahata@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Isaku Yamahata
2024-04-10 15:07:28 -07:00
committed by Paolo Bonzini
parent 9aed7a6c0b
commit bc1a5cd002
4 changed files with 78 additions and 0 deletions
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10
include/uapi/linux/kvm.h
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@@ -917,6 +917,7 @@ struct kvm_enable_cap {
#define KVM_CAP_MEMORY_ATTRIBUTES 233
#define KVM_CAP_GUEST_MEMFD 234
#define KVM_CAP_VM_TYPES 235
#define KVM_CAP_PRE_FAULT_MEMORY 236
struct kvm_irq_routing_irqchip {
__u32 irqchip;
@@ -1548,4 +1549,13 @@ struct kvm_create_guest_memfd {
__u64 reserved[6];
};
#define KVM_PRE_FAULT_MEMORY _IOWR(KVMIO, 0xd5, struct kvm_pre_fault_memory)
struct kvm_pre_fault_memory {
__u64 gpa;
__u64 size;
__u64 flags;
__u64 padding[5];
};
#endif /* __LINUX_KVM_H */