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page walk during copy_from_vm/copy_to_vm

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there are data transfer between guest(GPA) & hv(HPA), especially for
hypercall from guest.

guest should make sure these GPAs are address continous, but hv cannot
assure HPAs which mapped to these GPAs are address continous, for example,
after enable hugetlb, a contious GPA range could come from two different
2M pages.

this patch is handling such case by doing gpa page walking during
copy_from_vm & copy_to_vm.

Signed-off-by: Jason Chen CJ <jason.cj.chen@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Jason Chen CJ
2018-05-21 22:26:52 +08:00
committed by lijinxia
parent 58c109e8de
commit 2ff7bf826e
5 changed files with 76 additions and 51 deletions
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hypervisor/include/arch/x86/guest/guest.h
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@@ -139,6 +139,8 @@ int general_sw_loader(struct vm *vm, struct vcpu *vcpu);
typedef int (*vm_sw_loader_t)(struct vm *, struct vcpu *);
extern vm_sw_loader_t vm_sw_loader;
int copy_from_vm(struct vm *vm, void *h_ptr, uint64_t gpa, uint32_t size);
int copy_to_vm(struct vm *vm, void *h_ptr, uint64_t gpa, uint32_t size);
#endif /* !ASSEMBLER */
#endif /* GUEST_H*/