From: Masayoshi Mizuma <msys.mizuma@gmail.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, Baoquan He <bhe@redhat.com>,
Borislav Petkov <bp@alien8.de>
Cc: Masayoshi Mizuma <msys.mizuma@gmail.com>, linux-kernel@vger.kernel.org
Subject: [PATCH v6 2/3] ACPI/NUMA: Add warning message if the padding size for KASLR is not enough
Date: Tue, 2 Oct 2018 21:33:22 -0400 [thread overview]
Message-ID: <20181003013323.4162-3-msys.mizuma@gmail.com> (raw)
In-Reply-To: <20181003013323.4162-1-msys.mizuma@gmail.com>
Add warning message if the padding size for KASLR,
rand_mem_physical_padding, is not enough. The message also
says the suitable padding size.
Signed-off-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
---
drivers/acpi/numa.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/drivers/acpi/numa.c b/drivers/acpi/numa.c
index 8516760..420ed2c 100644
--- a/drivers/acpi/numa.c
+++ b/drivers/acpi/numa.c
@@ -32,6 +32,7 @@
#include <linux/numa.h>
#include <linux/nodemask.h>
#include <linux/topology.h>
+#include <asm/setup.h>
static nodemask_t nodes_found_map = NODE_MASK_NONE;
@@ -435,6 +436,7 @@ acpi_table_parse_srat(enum acpi_srat_type id,
int __init acpi_numa_init(void)
{
int cnt = 0;
+ u64 max_possible_phys, max_actual_phys, threshold;
if (acpi_disabled)
return -EINVAL;
@@ -463,6 +465,20 @@ int __init acpi_numa_init(void)
cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
acpi_parse_memory_affinity, 0);
+
+ /* check the padding size for KASLR is enough. */
+ if (parsed_numa_memblks && kaslr_enabled()) {
+ max_actual_phys = roundup(PFN_PHYS(max_pfn),
+ 1ULL << 40);
+ max_possible_phys = roundup(PFN_PHYS(max_possible_pfn),
+ 1ULL << 40);
+ threshold = max_actual_phys +
+ ((u64)get_rand_mem_physical_padding() << 40);
+
+ if (max_possible_phys > threshold)
+ pr_warn("Set 'rand_mem_physical_padding=%llu' to avoid memory hotadd failure.\n",
+ (max_possible_phys - max_actual_phys) >> 40);
+ }
}
/* SLIT: System Locality Information Table */
--
2.18.0
next prev parent reply other threads:[~2018-10-03 1:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-03 1:33 [PATCH v6 0/3] Add a kernel parameter to change the padding size for KASLR Masayoshi Mizuma
2018-10-03 1:33 ` [PATCH v6 1/3] x86/mm: Add a kernel parameter to change the padding used for the physical memory mapping Masayoshi Mizuma
2018-10-03 1:33 ` Masayoshi Mizuma [this message]
2018-10-03 1:33 ` [PATCH v6 3/3] Documentation/kernel-parameters.txt: Document rand_mem_physical_padding= Masayoshi Mizuma
2018-10-03 6:52 ` [PATCH v6 0/3] Add a kernel parameter to change the padding size for KASLR Ingo Molnar
2018-10-03 11:00 ` Masayoshi Mizuma
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