The arch specific code may need to know if a particular gpa is valid and
writable for the shared memory between the host and the guest. Currently,
there are few places where it is used in RISC-V implementation. Given the
nature of the function it may be used for other architectures.
Hence, a common helper function is added.
Suggested-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Signed-off-by: Atish Patra <atishp@xxxxxxxxxxxx>
---
include/linux/kvm_host.h | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 15656b7fba6c..eec5cbbcb4b3 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1892,6 +1892,14 @@ static inline bool kvm_is_gpa_in_memslot(struct kvm *kvm, gpa_t gpa)
return !kvm_is_error_hva(hva);
}
+static inline bool kvm_is_gpa_in_writable_memslot(struct kvm *kvm, gpa_t gpa)
+{
+ bool writable;
+ unsigned long hva = gfn_to_hva_prot(kvm, gpa_to_gfn(gpa), &writable);
+
+ return !kvm_is_error_hva(hva) && writable;
+}
+
static inline void kvm_gpc_mark_dirty_in_slot(struct gfn_to_pfn_cache *gpc)
{
lockdep_assert_held(&gpc->lock);
--
2.43.0
