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KVM: Implement kvm_put_guest()

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kvm_put_guest() is analogous to put_user() - it writes a single value to
the guest physical address. The implementation is built upon put_user()
and so it has the same single copy atomic properties.

Signed-off-by: Steven Price <steven.price@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Steven Price 2019-10-21 16:28:17 +01:00 committed by Marc Zyngier
parent b48c1a45a1
commit cac0f1b728
1 changed files with 22 additions and 0 deletions
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22
include/linux/kvm_host.h
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@ -746,6 +746,28 @@ int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
unsigned long len);
int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
gpa_t gpa, unsigned long len);
#define __kvm_put_guest(kvm, gfn, offset, value, type) \
({ \
unsigned long __addr = gfn_to_hva(kvm, gfn); \
type __user *__uaddr = (type __user *)(__addr + offset); \
int __ret = -EFAULT; \
\
if (!kvm_is_error_hva(__addr)) \
__ret = put_user(value, __uaddr); \
if (!__ret) \
mark_page_dirty(kvm, gfn); \
__ret; \
})
#define kvm_put_guest(kvm, gpa, value, type) \
({ \
gpa_t __gpa = gpa; \
struct kvm *__kvm = kvm; \
__kvm_put_guest(__kvm, __gpa >> PAGE_SHIFT, \
offset_in_page(__gpa), (value), type); \
})
int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);