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Commit e03b644fe68b1c6401465b02724d261538dba10f

Authored by Gleb Natapov
Committed by Avi Kivity
1 parent 29d03158f9
Exists in master and in 6 other branches imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga, smarc-l5.0.0_1.0.0-ga

KVM: introduce kvm_read_guest_cached 

Introduce kvm_read_guest_cached() function in addition to write one we
already have.

[ by glauber: export function signature in kvm header ]

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Glauber Costa <glommer@redhat.com>
Acked-by: Rik van Riel <riel@redhat.com>
Tested-by: Eric Munson <emunson@mgebm.net>
Signed-off-by: Avi Kivity <avi@redhat.com>

Showing 2 changed files with 22 additions and 0 deletions Side-by-side Diff

include/linux/kvm_host.h
Diff comments   View file @ e03b644
... ... @@ -381,6 +381,8 @@
381 381 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
382 382 unsigned long len);
383 383 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
  384 +int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
  385 + void *data, unsigned long len);
384 386 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
385 387 int offset, int len);
386 388 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
... ... @@ -1418,6 +1418,26 @@
1418 1418 }
1419 1419 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1420 1420  
  1421 +int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
  1422 + void *data, unsigned long len)
  1423 +{
  1424 + struct kvm_memslots *slots = kvm_memslots(kvm);
  1425 + int r;
  1426 +
  1427 + if (slots->generation != ghc->generation)
  1428 + kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
  1429 +
  1430 + if (kvm_is_error_hva(ghc->hva))
  1431 + return -EFAULT;
  1432 +
  1433 + r = __copy_from_user(data, (void __user *)ghc->hva, len);
  1434 + if (r)
  1435 + return -EFAULT;
  1436 +
  1437 + return 0;
  1438 +}
  1439 +EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
  1440 +
1421 1441 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1422 1442 {
1423 1443 return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page,