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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2020-05-25 16:41:19 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-06-01 04:26:07 -0400 |
| commit | 0958f0cefede403037653e44de0e3332d10b0e1a (patch) | |
| tree | 466df4d6eff1380ac760270f53b3ccf4f62fb281 /virt | |
| parent | 7c0ade6c9023b2b90b757e2927b306bec1cc4ca6 (diff) | |
| download | linux-0958f0cefede403037653e44de0e3332d10b0e1a.tar.bz2 | |
KVM: introduce kvm_read_guest_offset_cached()
We already have kvm_write_guest_offset_cached(), introduce read analogue.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20200525144125.143875-5-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/kvm_main.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index c9c6db5f77c2..e2af6ffce9c9 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -2510,13 +2510,15 @@ int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, } EXPORT_SYMBOL_GPL(kvm_write_guest_cached); -int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, - void *data, unsigned long len) +int kvm_read_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, + void *data, unsigned int offset, + unsigned long len) { struct kvm_memslots *slots = kvm_memslots(kvm); int r; + gpa_t gpa = ghc->gpa + offset; - BUG_ON(len > ghc->len); + BUG_ON(len + offset > ghc->len); if (slots->generation != ghc->generation) { if (__kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len)) @@ -2527,14 +2529,21 @@ int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, return -EFAULT; if (unlikely(!ghc->memslot)) - return kvm_read_guest(kvm, ghc->gpa, data, len); + return kvm_read_guest(kvm, gpa, data, len); - r = __copy_from_user(data, (void __user *)ghc->hva, len); + r = __copy_from_user(data, (void __user *)ghc->hva + offset, len); if (r) return -EFAULT; return 0; } +EXPORT_SYMBOL_GPL(kvm_read_guest_offset_cached); + +int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, + void *data, unsigned long len) +{ + return kvm_read_guest_offset_cached(kvm, ghc, data, 0, len); +} EXPORT_SYMBOL_GPL(kvm_read_guest_cached); int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) |