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| author | Sean Christopherson <seanjc@google.com> | 2024-10-10 20:23:45 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2024-10-25 19:00:47 +0200 |
| commit | 1c7b627e930624dd64ee906df554c8f2bad628ff (patch) | |
| tree | 16fc33288bf4418712f0816df622ba5de9dd4071 /virt | |
| parent | KVM: Move declarations of memslot accessors up in kvm_host.h (diff) | |
| download | linux-1c7b627e930624dd64ee906df554c8f2bad628ff.tar.xz linux-1c7b627e930624dd64ee906df554c8f2bad628ff.zip | |
KVM: Add kvm_faultin_pfn() to specifically service guest page faults
Add a new dedicated API, kvm_faultin_pfn(), for servicing guest page
faults, i.e. for getting pages/pfns that will be mapped into the guest via
an mmu_notifier-protected KVM MMU. Keep struct kvm_follow_pfn buried in
internal code, as having __kvm_faultin_pfn() take "out" params is actually
cleaner for several architectures, e.g. it allows the caller to have its
own "page fault" structure without having to marshal data to/from
kvm_follow_pfn.
Long term, common KVM would ideally provide a kvm_page_fault structure, a
la x86's struct of the same name. But all architectures need to be
converted to a common API before that can happen.
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Tested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20241010182427.1434605-44-seanjc@google.com>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/kvm_main.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index becf640e369c..f79745d6500c 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -3092,6 +3092,28 @@ kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) } EXPORT_SYMBOL_GPL(gfn_to_pfn); +kvm_pfn_t __kvm_faultin_pfn(const struct kvm_memory_slot *slot, gfn_t gfn, + unsigned int foll, bool *writable, + struct page **refcounted_page) +{ + struct kvm_follow_pfn kfp = { + .slot = slot, + .gfn = gfn, + .flags = foll, + .map_writable = writable, + .refcounted_page = refcounted_page, + }; + + if (WARN_ON_ONCE(!writable || !refcounted_page)) + return KVM_PFN_ERR_FAULT; + + *writable = false; + *refcounted_page = NULL; + + return kvm_follow_pfn(&kfp); +} +EXPORT_SYMBOL_GPL(__kvm_faultin_pfn); + int kvm_prefetch_pages(struct kvm_memory_slot *slot, gfn_t gfn, struct page **pages, int nr_pages) { |