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[2001:8b0:1d0::2]) by smtp.gmail.com with ESMTPSA id v24-20020a05600c215800b003fa95f328afsm10578798wml.29.2023.07.10.08.21.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Jul 2023 08:21:32 -0700 (PDT) From: Peter Maydell To: qemu-arm@nongnu.org, qemu-devel@nongnu.org Cc: Jean-Philippe Brucker , Richard Henderson Subject: [PATCH for-8.1 1/3] target/arm/ptw.c: Add comments to S1Translate struct fields Date: Mon, 10 Jul 2023 16:21:28 +0100 Message-Id: <20230710152130.3928330-2-peter.maydell@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230710152130.3928330-1-peter.maydell@linaro.org> References: <20230710152130.3928330-1-peter.maydell@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::332; envelope-from=peter.maydell@linaro.org; helo=mail-wm1-x332.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, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@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-devel-bounces+patch=linaro.org@nongnu.org Sender: qemu-devel-bounces+patch=linaro.org@nongnu.org Add comments to the in_* fields in the S1Translate struct that explain what they're doing. Signed-off-by: Peter Maydell Reviewed-by: Richard Henderson --- I figured some of this out when writing commit fcc0b0418fff, and then I found I'd forgotten it all when I was trying to fix this new bug. So this time I'm writing this down :-) --- target/arm/ptw.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/target/arm/ptw.c b/target/arm/ptw.c index 9aaff1546a6..21749375f97 100644 --- a/target/arm/ptw.c +++ b/target/arm/ptw.c @@ -19,10 +19,50 @@ #endif typedef struct S1Translate { + /* + * in_mmu_idx : specifies which TTBR, TCR, etc to use for the walk. + * Together with in_space, specifies the architectural translation regime. + */ ARMMMUIdx in_mmu_idx; + /* + * in_ptw_idx: specifies which mmuidx to use for the actual + * page table descriptor load operations. This will be one of the + * ARMMMUIdx_Stage2* or one of the ARMMMUIdx_Phys_* indexes. + * If a Secure ptw is "downgraded" to NonSecure by an NSTable bit, + * this field is updated accordingly. + */ ARMMMUIdx in_ptw_idx; + /* + * in_space: the security space for this walk. This plus + * the in_mmu_idx specify the architectural translation regime. + * If a Secure ptw is "downgraded" to NonSecure by an NSTable bit, + * this field is updated accordingly. + * + * Note that the security space for the in_ptw_idx may be different + * from that for the in_mmu_idx. We do not need to explicitly track + * the in_ptw_idx security space because: + * - if the in_ptw_idx is an ARMMMUIdx_Phys_* then the mmuidx + * itself specifies the security space + * - if the in_ptw_idx is an ARMMMUIdx_Stage2* then the security + * space used for ptw reads is the same as that of the security + * space of the stage 1 translation for all cases except where + * stage 1 is Secure; in that case the only possibilities for + * the ptw read are Secure and NonSecure, and the in_ptw_idx + * value being Stage2 vs Stage2_S distinguishes those. + */ ARMSecuritySpace in_space; + /* + * in_secure: whether the translation regime is a Secure one. + * This is always equal to arm_space_is_secure(in_space). + * If a Secure ptw is "downgraded" to NonSecure by an NSTable bit, + * this field is updated accordingly. + */ bool in_secure; + /* + * in_debug: is this a QEMU debug access (gdbstub, etc)? Debug + * accesses will not update the guest page table access flags + * and will not change the state of the softmmu TLBs. + */ bool in_debug; /* * If this is stage 2 of a stage 1+2 page table walk, then this must