From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx1.redhat.com ([209.132.183.28]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gEUwK-0006VC-2y for kexec@lists.infradead.org; Mon, 22 Oct 2018 07:48:00 +0000 From: Lianbo Jiang Subject: [PATCH 2/2 v4] x86/kexec_file: add reserved e820 ranges to kdump kernel e820 table Date: Mon, 22 Oct 2018 15:47:07 +0800 Message-Id: <20181022074707.13901-3-lijiang@redhat.com> In-Reply-To: <20181022074707.13901-1-lijiang@redhat.com> References: <20181022074707.13901-1-lijiang@redhat.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: linux-kernel@vger.kernel.org Cc: thomas.lendacky@amd.com, bhe@redhat.com, x86@kernel.org, kexec@lists.infradead.org, mingo@redhat.com, bp@alien8.de, tglx@linutronix.de, dyoung@redhat.com E820 reserved ranges is useful in kdump kernel, it has been added in kexec-tools code. One reason is PCI mmconf (extended mode) requires reserved region otherwise it falls back to legacy mode. When AMD SME kdump support, it needs to map dmi table area as decrypted. For normal boot, these ranges sit in e820 reserved ranges, thus the early ioremap code naturally map them as decrypted. If it also has same e820 reserve setup in kdump kernel then it will just work like normal kernel. Suggested-by: Dave Young Signed-off-by: Lianbo Jiang --- arch/x86/kernel/crash.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c index ae724a6e0a5f..d3167125800e 100644 --- a/arch/x86/kernel/crash.c +++ b/arch/x86/kernel/crash.c @@ -384,6 +384,10 @@ int crash_setup_memmap_entries(struct kimage *image, struct boot_params *params) walk_iomem_res_desc(IORES_DESC_ACPI_NV_STORAGE, flags, 0, -1, &cmd, memmap_entry_callback); + cmd.type = E820_TYPE_RESERVED; + walk_iomem_res_desc(IORES_DESC_NONE, 0, 0, -1, &cmd, + memmap_entry_callback); + /* Add crashk_low_res region */ if (crashk_low_res.end) { ei.addr = crashk_low_res.start; -- 2.17.1 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec