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Fri, 29 Aug 2025 07:41:14 -0700 (PDT) From: Atish Patra Date: Fri, 29 Aug 2025 07:41:07 -0700 Subject: [PATCH v5 6/9] KVM: Add a helper function to check if a gpa is in writable memselot Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250829-pmu_event_info-v5-6-9dca26139a33@rivosinc.com> References: <20250829-pmu_event_info-v5-0-9dca26139a33@rivosinc.com> In-Reply-To: <20250829-pmu_event_info-v5-0-9dca26139a33@rivosinc.com> To: Anup Patel , Will Deacon , Mark Rutland , Paul Walmsley , Palmer Dabbelt , Mayuresh Chitale Cc: linux-riscv@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, Atish Patra , Sean Christopherson X-Mailer: b4 0.15-dev-50721 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 Signed-off-by: Atish Patra --- 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); } =20 +static inline bool kvm_is_gpa_in_writable_memslot(struct kvm *kvm, gpa_t g= pa) +{ + bool writable; + unsigned long hva =3D 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); --=20 2.43.0