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[93.143.80.194]) by smtp.googlemail.com with ESMTPSA id 5b1f17b1804b1-486f420de8asm56471095e9.3.2026.03.18.03.47.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Mar 2026 03:47:04 -0700 (PDT) From: Ruslan Ruslichenko To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, artem_mygaiev@epam.com, volodymyr_babchuk@epam.com, alex.bennee@linaro.org, peter.maydell@linaro.org, pierrick.bouvier@linaro.org, philmd@linaro.org, Ruslan_Ruslichenko@epam.com Subject: [RFC PATCH 5/9] system/memory: Add plugin callbacks to intercept MMIO accesses Date: Wed, 18 Mar 2026 11:46:36 +0100 Message-ID: <20260318104640.239752-6-ruslichenko.r@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260318104640.239752-1-ruslichenko.r@gmail.com> References: <20260318104640.239752-1-ruslichenko.r@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::32a; envelope-from=ruslichenko.r@gmail.com; helo=mail-wm1-x32a.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org Sender: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org From: Ruslan Ruslichenko Add plugin callback to dispatch memory_region_dispath_read/write, allowing plugins to intercept MMIO operations before they reach device models, which enable to spoof read values and drop write accesses. Signed-off-by: Ruslan Ruslichenko --- system/memory.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/system/memory.c b/system/memory.c index c51d0798a8..67a59f6e0a 100644 --- a/system/memory.c +++ b/system/memory.c @@ -35,6 +35,7 @@ #include "hw/core/boards.h" #include "migration/vmstate.h" #include "system/address-spaces.h" +#include "qemu/plugin.h" #include "memory-internal.h" @@ -1448,6 +1449,10 @@ static MemTxResult memory_region_dispatch_read1(MemoryRegion *mr, { *pval = 0; + + if (plugin_mmio_override_cb_invoke(mr->addr + addr, size, false, pval)) + return MEMTX_OK; + if (mr->ops->read) { return access_with_adjusted_size(addr, pval, size, mr->ops->impl.min_access_size, @@ -1533,6 +1538,9 @@ MemTxResult memory_region_dispatch_write(MemoryRegion *mr, adjust_endianness(mr, &data, op); + if (plugin_mmio_override_cb_invoke(mr->addr + addr, size, true, &data)) + return MEMTX_OK; + /* * FIXME: it's not clear why under KVM the write would be processed * directly, instead of going through eventfd. This probably should -- 2.43.0