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Tue, 19 Mar 2019 22:09:47 -0700 (PDT) Received: from localhost ([122.177.144.121]) by smtp.gmail.com with ESMTPSA id o7sm1351397pfi.105.2019.03.19.22.09.45 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 19 Mar 2019 22:09:46 -0700 (PDT) From: Bhupesh Sharma To: linux-kernel@vger.kernel.org Subject: [PATCH v3 1/3] arm64, vmcoreinfo : Append 'PTRS_PER_PGD' to vmcoreinfo Date: Wed, 20 Mar 2019 10:39:32 +0530 Message-Id: <1553058574-18606-2-git-send-email-bhsharma@redhat.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1553058574-18606-1-git-send-email-bhsharma@redhat.com> References: <1553058574-18606-1-git-send-email-bhsharma@redhat.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190319_220948_084490_B060F507 X-CRM114-Status: GOOD ( 13.78 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Kazuhito Hagio , kexec@lists.infradead.org, bhsharma@redhat.com, Will Deacon , James Morse , Dave Anderson , bhupesh.linux@gmail.com, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org With ARMv8.2-LVA architecture extension availability, arm64 hardware which supports this extension can support a virtual address-space upto 52-bits. Since at the moment we enable the support of this extension in kernel via CONFIG flags, e.g. - User-space 52-bit LVA via CONFIG_ARM64_USER_VA_BITS_52 so, there is no clear mechanism in the user-space right now to determine these CONFIG flag values and hence determine the maximum virtual address space supported by the underlying kernel. User-space tools like 'makedumpfile' therefore are broken currently as they have no proper method to calculate the 'PTRS_PER_PGD' value which is required to perform a page table walk to determine the physical address of a corresponding virtual address found in kcore/vmcoreinfo. If one appends 'PTRS_PER_PGD' number to vmcoreinfo for arm64, it can be used in user-space to determine the maximum virtual address supported by underlying kernel. A reference 'makedumpfile' implementation which uses this approach to determining the maximum physical address is available in [0]. [0]. https://github.com/bhupesh-sharma/makedumpfile/blob/52-bit-va-support-via-vmcore-upstream-v3/arch/arm64.c#L459 Cc: Mark Rutland Cc: Will Deacon Cc: James Morse Cc: Dave Anderson Cc: Kazuhito Hagio Cc: linux-kernel@vger.kernel.org Cc: kexec@lists.infradead.org Cc: linux-arm-kernel@lists.infradead.org Suggested-by: Steve Capper Signed-off-by: Bhupesh Sharma --- arch/arm64/kernel/crash_core.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/kernel/crash_core.c b/arch/arm64/kernel/crash_core.c index ca4c3e12d8c5..123a42c56b8e 100644 --- a/arch/arm64/kernel/crash_core.c +++ b/arch/arm64/kernel/crash_core.c @@ -10,6 +10,7 @@ void arch_crash_save_vmcoreinfo(void) { VMCOREINFO_NUMBER(VA_BITS); + VMCOREINFO_NUMBER(PTRS_PER_PGD); /* Please note VMCOREINFO_NUMBER() uses "%d", not "%x" */ vmcoreinfo_append_str("NUMBER(kimage_voffset)=0x%llx\n", kimage_voffset); -- 2.7.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel