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>,
Dario Faggioli <dfaggioli@suse.com>,
Dave Hansen <dave.hansen@intel.com>,
Mike Rapoport <rppt@kernel.org>,
David Hildenbrand <david@redhat.com>,
Mel Gorman <mgorman@techsingularity.net>,
marcelo.cerri@canonical.com, tim.gardner@canonical.com,
khalid.elmously@canonical.com, philip.cox@canonical.com,
aarcange@redhat.com, peterx@redhat.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: [PATCHv8 09/14] x86/mm: Provide helpers for unaccepted memory
Date: Wed, 7 Dec 2022 04:49:28 +0300 [thread overview]
Message-ID: <20221207014933.8435-10-kirill.shutemov@linux.intel.com> (raw)
In-Reply-To: <20221207014933.8435-1-kirill.shutemov@linux.intel.com>
Core-mm requires few helpers to support unaccepted memory:
- accept_memory() checks the range of addresses against the bitmap and
accept memory if needed.
- range_contains_unaccepted_memory() checks if anything within the
range requires acceptance.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
arch/x86/include/asm/page.h | 3 ++
arch/x86/include/asm/unaccepted_memory.h | 4 ++
arch/x86/mm/Makefile | 2 +
arch/x86/mm/unaccepted_memory.c | 61 ++++++++++++++++++++++++
4 files changed, 70 insertions(+)
create mode 100644 arch/x86/mm/unaccepted_memory.c
diff --git a/arch/x86/include/asm/page.h b/arch/x86/include/asm/page.h
index 9cc82f305f4b..df4ec3a988dc 100644
--- a/arch/x86/include/asm/page.h
+++ b/arch/x86/include/asm/page.h
@@ -19,6 +19,9 @@
struct page;
#include <linux/range.h>
+
+#include <asm/unaccepted_memory.h>
+
extern struct range pfn_mapped[];
extern int nr_pfn_mapped;
diff --git a/arch/x86/include/asm/unaccepted_memory.h b/arch/x86/include/asm/unaccepted_memory.h
index 41fbfc798100..89fc91c61560 100644
--- a/arch/x86/include/asm/unaccepted_memory.h
+++ b/arch/x86/include/asm/unaccepted_memory.h
@@ -7,6 +7,10 @@ struct boot_params;
void process_unaccepted_memory(struct boot_params *params, u64 start, u64 num);
+#ifdef CONFIG_UNACCEPTED_MEMORY
+
void accept_memory(phys_addr_t start, phys_addr_t end);
+bool range_contains_unaccepted_memory(phys_addr_t start, phys_addr_t end);
#endif
+#endif
diff --git a/arch/x86/mm/Makefile b/arch/x86/mm/Makefile
index c80febc44cd2..b0ef1755e5c8 100644
--- a/arch/x86/mm/Makefile
+++ b/arch/x86/mm/Makefile
@@ -67,3 +67,5 @@ obj-$(CONFIG_AMD_MEM_ENCRYPT) += mem_encrypt_amd.o
obj-$(CONFIG_AMD_MEM_ENCRYPT) += mem_encrypt_identity.o
obj-$(CONFIG_AMD_MEM_ENCRYPT) += mem_encrypt_boot.o
+
+obj-$(CONFIG_UNACCEPTED_MEMORY) += unaccepted_memory.o
diff --git a/arch/x86/mm/unaccepted_memory.c b/arch/x86/mm/unaccepted_memory.c
new file mode 100644
index 000000000000..1df918b21469
--- /dev/null
+++ b/arch/x86/mm/unaccepted_memory.c
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include <linux/memblock.h>
+#include <linux/mm.h>
+#include <linux/pfn.h>
+#include <linux/spinlock.h>
+
+#include <asm/io.h>
+#include <asm/setup.h>
+#include <asm/unaccepted_memory.h>
+
+/* Protects unaccepted memory bitmap */
+static DEFINE_SPINLOCK(unaccepted_memory_lock);
+
+void accept_memory(phys_addr_t start, phys_addr_t end)
+{
+ unsigned long range_start, range_end;
+ unsigned long *bitmap;
+ unsigned long flags;
+
+ if (!boot_params.unaccepted_memory)
+ return;
+
+ bitmap = __va(boot_params.unaccepted_memory);
+ range_start = start / PMD_SIZE;
+
+ spin_lock_irqsave(&unaccepted_memory_lock, flags);
+ for_each_set_bitrange_from(range_start, range_end, bitmap,
+ DIV_ROUND_UP(end, PMD_SIZE)) {
+ unsigned long len = range_end - range_start;
+
+ /* Platform-specific memory-acceptance call goes here */
+ panic("Cannot accept memory: unknown platform\n");
+ bitmap_clear(bitmap, range_start, len);
+ }
+ spin_unlock_irqrestore(&unaccepted_memory_lock, flags);
+}
+
+bool range_contains_unaccepted_memory(phys_addr_t start, phys_addr_t end)
+{
+ unsigned long *bitmap;
+ unsigned long flags;
+ bool ret = false;
+
+ if (!boot_params.unaccepted_memory)
+ return 0;
+
+ bitmap = __va(boot_params.unaccepted_memory);
+
+ spin_lock_irqsave(&unaccepted_memory_lock, flags);
+ while (start < end) {
+ if (test_bit(start / PMD_SIZE, bitmap)) {
+ ret = true;
+ break;
+ }
+
+ start += PMD_SIZE;
+ }
+ spin_unlock_irqrestore(&unaccepted_memory_lock, flags);
+
+ return ret;
+}
--
2.38.0
next prev parent reply other threads:[~2022-12-07 1:51 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-07 1:49 [PATCHv8 00/14] mm, x86/cc: Implement support for unaccepted memory Kirill A. Shutemov
2022-12-07 1:49 ` [PATCHv8 01/14] x86/boot: Centralize __pa()/__va() definitions Kirill A. Shutemov
2022-12-07 1:49 ` [PATCHv8 02/14] mm: Add support for unaccepted memory Kirill A. Shutemov
2022-12-09 18:10 ` Vlastimil Babka
2022-12-09 19:26 ` Kirill A. Shutemov
2022-12-09 22:23 ` Vlastimil Babka
2022-12-24 16:46 ` Kirill A. Shutemov
2023-01-12 11:59 ` Vlastimil Babka
2022-12-26 12:23 ` Borislav Petkov
2022-12-27 3:18 ` Kirill A. Shutemov
2023-01-16 13:04 ` Mel Gorman
2022-12-07 1:49 ` [PATCHv8 03/14] mm: Report unaccepted memory in meminfo Kirill A. Shutemov
2022-12-07 1:49 ` [PATCHv8 04/14] efi/x86: Get full memory map in allocate_e820() Kirill A. Shutemov
2022-12-07 1:49 ` [PATCHv8 05/14] x86/boot: Add infrastructure required for unaccepted memory support Kirill A. Shutemov
2023-01-03 13:52 ` Borislav Petkov
2022-12-07 1:49 ` [PATCHv8 06/14] efi/x86: Implement support for unaccepted memory Kirill A. Shutemov
2023-01-03 14:20 ` Borislav Petkov
2023-03-25 0:51 ` Kirill A. Shutemov
2022-12-07 1:49 ` [PATCHv8 07/14] x86/boot/compressed: Handle " Kirill A. Shutemov
2022-12-07 1:49 ` [PATCHv8 08/14] x86/mm: Reserve unaccepted memory bitmap Kirill A. Shutemov
2022-12-07 1:49 ` Kirill A. Shutemov [this message]
2022-12-07 1:49 ` [PATCHv8 10/14] x86/mm: Avoid load_unaligned_zeropad() stepping into unaccepted memory Kirill A. Shutemov
2022-12-07 1:49 ` [PATCHv8 11/14] x86: Disable kexec if system has " Kirill A. Shutemov
2022-12-07 1:49 ` [PATCHv8 12/14] x86/tdx: Make _tdx_hypercall() and __tdx_module_call() available in boot stub Kirill A. Shutemov
2022-12-07 1:49 ` [PATCHv8 13/14] x86/tdx: Refactor try_accept_one() Kirill A. Shutemov
2022-12-07 1:49 ` [PATCHv8 14/14] x86/tdx: Add unaccepted memory support Kirill A. Shutemov
2022-12-08 15:29 ` [PATCH v6 0/5] Provide SEV-SNP support for unaccepted memory Tom Lendacky
2022-12-08 15:29 ` [PATCH v6 1/5] x86/sev: Fix calculation of end address based on number of pages Tom Lendacky
2022-12-08 15:29 ` [PATCH v6 2/5] x86/sev: Put PSC struct on the stack in prep for unaccepted memory support Tom Lendacky
2022-12-08 15:29 ` [PATCH v6 3/5] x86/sev: Allow for use of the early boot GHCB for PSC requests Tom Lendacky
2022-12-08 15:29 ` [PATCH v6 4/5] x86/sev: Use large PSC requests if applicable Tom Lendacky
2022-12-08 15:29 ` [PATCH v6 5/5] x86/sev: Add SNP-specific unaccepted memory support Tom Lendacky
2022-12-08 22:12 ` Kirill A. Shutemov
2022-12-09 14:18 ` Tom Lendacky
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20221207014933.8435-10-kirill.shutemov@linux.intel.com \
--to=kirill.shutemov@linux.intel.com \
--cc=aarcange@redhat.com \
--cc=ak@linux.intel.com \
--cc=akpm@linux-foundation.org \
--cc=ardb@kernel.org \
--cc=bp@alien8.de \
--cc=dave.hansen@intel.com \
--cc=david@redhat.com \
--cc=dfaggioli@suse.com \
--cc=jroedel@suse.de \
--cc=khalid.elmously@canonical.com \
--cc=linux-coco@lists.linux.dev \
--cc=linux-efi@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=luto@kernel.org \
--cc=marcelo.cerri@canonical.com \
--cc=mgorman@techsingularity.net \
--cc=mingo@redhat.com \
--cc=pbonzini@redhat.com \
--cc=peterx@redhat.com \
--cc=peterz@infradead.org \
--cc=philip.cox@canonical.com \
--cc=rientjes@google.com \
--cc=rppt@kernel.org \
--cc=sathyanarayanan.kuppuswamy@linux.intel.com \
--cc=seanjc@google.com \
--cc=tglx@linutronix.de \
--cc=thomas.lendacky@amd.com \
--cc=tim.gardner@canonical.com \
--cc=vbabka@suse.cz \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).