From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>,
Sean Christopherson <seanjc@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Joerg Roedel <jroedel@suse.de>, Ard Biesheuvel <ardb@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>,
Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@linux.intel.com>,
David Rientjes <rientjes@google.com>,
Vlastimil Babka <vbabka@suse.cz>,
Tom Lendacky <thomas.lendacky@amd.com>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Ingo Molnar <mingo@redhat.com>,
Varad Gautam <varad.gautam@suse.com>,
Dario Faggioli <dfaggioli@suse.com>,
Dave Hansen <dave.hansen@intel.com>,
Mike Rapoport <rppt@kernel.org>,
David Hildenbrand <david@redhat.com>,
marcelo.cerri@canonical.com, tim.gardner@canonical.com,
khalid.elmously@canonical.com, philip.cox@canonical.com,
x86@kernel.org, linux-mm@kvack.org, linux-coco@lists.linux.dev,
linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCHv6 11/15] x86: Disable kexec if system has unaccepted memory
Date: Tue, 17 May 2022 18:34:40 +0300 [thread overview]
Message-ID: <20220517153444.11195-12-kirill.shutemov@linux.intel.com> (raw)
In-Reply-To: <20220517153444.11195-1-kirill.shutemov@linux.intel.com>
On kexec, the target kernel has to know what memory has been accepted.
Information in EFI map is out of date and cannot be used.
boot_params.unaccepted_memory can be used to pass the bitmap between two
kernels on kexec, but the use-case is not yet implemented.
Disable kexec on machines with unaccepted memory for now.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
arch/x86/mm/unaccepted_memory.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/arch/x86/mm/unaccepted_memory.c b/arch/x86/mm/unaccepted_memory.c
index 1ca71eb98c24..b4c43e6089b0 100644
--- a/arch/x86/mm/unaccepted_memory.c
+++ b/arch/x86/mm/unaccepted_memory.c
@@ -1,4 +1,5 @@
// SPDX-License-Identifier: GPL-2.0-only
+#include <linux/kexec.h>
#include <linux/memblock.h>
#include <linux/mm.h>
#include <linux/pfn.h>
@@ -114,6 +115,15 @@ static int __init unaccepted_init(void)
if (!boot_params.unaccepted_memory)
return 0;
+#ifdef CONFIG_KEXEC_CORE
+ /*
+ * TODO: Information on memory acceptance status has to be communicated
+ * between kernel.
+ */
+ pr_warn("Disable kexec: not yet supported on systems with unaccepted memory\n");
+ kexec_load_disabled = 1;
+#endif
+
bitmap_size = e820__end_of_ram_pfn() * PAGE_SIZE / PMD_SIZE;
unaccepted_memory = __va(boot_params.unaccepted_memory);
--
2.35.1
next prev parent reply other threads:[~2022-05-17 15:36 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-17 15:34 [PATCHv6 00/15] mm, x86/cc: Implement support for unaccepted memory Kirill A. Shutemov
2022-05-17 15:34 ` [PATCHv6 01/15] x86/boot: Centralize __pa()/__va() definitions Kirill A. Shutemov
2022-05-17 15:34 ` [PATCHv6 02/15] mm: Add support for unaccepted memory Kirill A. Shutemov
2022-05-17 17:45 ` Andrew Morton
2022-05-17 18:04 ` Kirill A. Shutemov
2022-05-19 10:43 ` Gupta, Pankaj
2022-05-19 11:55 ` Kirill A. Shutemov
2022-05-19 14:33 ` Gupta, Pankaj
2022-06-01 8:47 ` David Hildenbrand
2022-05-17 15:34 ` [PATCHv6 03/15] efi/x86: Get full memory map in allocate_e820() Kirill A. Shutemov
2022-06-01 9:00 ` David Hildenbrand
2022-06-01 14:35 ` Kirill A. Shutemov
2022-06-01 14:39 ` David Hildenbrand
2022-06-01 14:46 ` Kirill A. Shutemov
2022-05-17 15:34 ` [PATCHv6 04/15] x86/boot: Add infrastructure required for unaccepted memory support Kirill A. Shutemov
2022-05-17 15:34 ` [PATCHv6 05/15] efi/x86: Implement support for unaccepted memory Kirill A. Shutemov
2022-05-17 15:34 ` [PATCHv6 06/15] x86/boot/compressed: Handle " Kirill A. Shutemov
2022-05-17 15:34 ` [PATCHv6 07/15] x86/mm: Reserve unaccepted memory bitmap Kirill A. Shutemov
2022-05-17 15:34 ` [PATCHv6 08/15] x86/mm: Provide helpers for unaccepted memory Kirill A. Shutemov
2022-05-17 15:34 ` [PATCHv6 09/15] x86/mm: Avoid load_unaligned_zeropad() stepping into " Kirill A. Shutemov
2022-05-17 15:34 ` [PATCHv6 10/15] x86/mm: Report unaccepted memory in /proc/meminfo Kirill A. Shutemov
2022-06-02 8:39 ` David Hildenbrand
2022-05-17 15:34 ` Kirill A. Shutemov [this message]
2022-05-17 15:34 ` [PATCHv6 12/15] x86/tdx: Make _tdx_hypercall() and __tdx_module_call() available in boot stub Kirill A. Shutemov
2022-05-17 15:34 ` [PATCHv6 13/15] x86/tdx: Refactor try_accept_one() Kirill A. Shutemov
2022-05-17 15:34 ` [PATCHv6 14/15] x86/tdx: Add unaccepted memory support Kirill A. Shutemov
2022-05-17 15:34 ` [PATCHv6 15/15] mm/vmstat: Add counter for memory accepting Kirill A. Shutemov
2022-06-01 9:05 ` David Hildenbrand
2022-06-01 14:41 ` Kirill A. Shutemov
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