From: Ashish Kalra <Ashish.Kalra@amd.com>
To: <tglx@linutronix.de>, <mingo@redhat.com>, <bp@alien8.de>,
<dave.hansen@linux.intel.com>, <x86@kernel.org>
Cc: <rafael@kernel.org>, <peterz@infradead.org>,
<adrian.hunter@intel.com>,
<sathyanarayanan.kuppuswamy@linux.intel.com>,
<jun.nakajima@intel.com>, <rick.p.edgecombe@intel.com>,
<thomas.lendacky@amd.com>, <michael.roth@amd.com>,
<seanjc@google.com>, <kai.huang@intel.com>, <bhe@redhat.com>,
<kirill.shutemov@linux.intel.com>, <bdas@redhat.com>,
<vkuznets@redhat.com>, <dionnaglaze@google.com>,
<anisinha@redhat.com>, <jroedel@suse.de>, <ardb@kernel.org>,
<kexec@lists.infradead.org>, <linux-coco@lists.linux.dev>,
<linux-kernel@vger.kernel.org>
Subject: [PATCH v4 1/4] efi/x86: skip efi_arch_mem_reserve() in case of kexec.
Date: Tue, 9 Apr 2024 20:42:23 +0000 [thread overview]
Message-ID: <e399107dbe1b13db3af7ab702400a5dfe0a1e9a3.1712694667.git.ashish.kalra@amd.com> (raw)
In-Reply-To: <cover.1712694667.git.ashish.kalra@amd.com>
From: Ashish Kalra <ashish.kalra@amd.com>
For kexec use case, need to use and stick to the EFI memmap passed
from the first kernel via boot-params/setup data, hence,
skip efi_arch_mem_reserve() during kexec.
Additionally during SNP guest kexec testing discovered that EFI memmap
is corrupted during chained kexec. kexec_enter_virtual_mode() during
late init will remap the efi_memmap physical pages allocated in
efi_arch_mem_reserve() via memblock & then subsequently cause random
EFI memmap corruption once memblock is freed/teared-down.
Suggested-by: Dave Young <dyoung@redhat.com>
[Dave Young: checking the md attribute instead of checking the efi_setup]
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
---
arch/x86/platform/efi/quirks.c | 20 ++++++++++++++++++--
1 file changed, 18 insertions(+), 2 deletions(-)
diff --git a/arch/x86/platform/efi/quirks.c b/arch/x86/platform/efi/quirks.c
index f0cc00032751..982f5e50a4b3 100644
--- a/arch/x86/platform/efi/quirks.c
+++ b/arch/x86/platform/efi/quirks.c
@@ -258,12 +258,28 @@ void __init efi_arch_mem_reserve(phys_addr_t addr, u64 size)
int num_entries;
void *new;
- if (efi_mem_desc_lookup(addr, &md) ||
- md.type != EFI_BOOT_SERVICES_DATA) {
+ /*
+ * For kexec use case, we need to use the EFI memmap passed from the first
+ * kernel via setup data, so we need to skip this.
+ * Additionally kexec_enter_virtual_mode() during late init will remap
+ * the efi_memmap physical pages allocated here via memboot & then
+ * subsequently cause random EFI memmap corruption once memblock is freed.
+ */
+
+ if (efi_mem_desc_lookup(addr, &md)) {
pr_err("Failed to lookup EFI memory descriptor for %pa\n", &addr);
return;
}
+ if (md.type != EFI_BOOT_SERVICES_DATA) {
+ pr_err("Skip reserving non EFI Boot Service Data memory for %pa\n", &addr);
+ return;
+ }
+
+ /* Kexec copied the efi memmap from the first kernel, thus skip the case */
+ if (md.attribute & EFI_MEMORY_RUNTIME)
+ return;
+
if (addr + size > md.phys_addr + (md.num_pages << EFI_PAGE_SHIFT)) {
pr_err("Region spans EFI memory descriptors, %pa\n", &addr);
return;
--
2.34.1
_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
next prev parent reply other threads:[~2024-04-09 20:43 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20240409113010.465412-1-kirill.shutemov@linux.intel.com>
[not found] ` <20240409113010.465412-6-kirill.shutemov@linux.intel.com>
2024-04-09 12:38 ` [PATCHv10 05/18] x86/kexec: Keep CR4.MCE set during kexec for TDX guest Huang, Kai
2024-04-09 14:22 ` Sean Christopherson
2024-04-09 15:26 ` Kirill A. Shutemov
2024-04-28 17:11 ` Borislav Petkov
2024-04-29 13:17 ` Kirill A. Shutemov
2024-04-29 14:45 ` Borislav Petkov
2024-04-29 15:16 ` Kirill A. Shutemov
2024-04-30 12:57 ` Borislav Petkov
2024-04-30 13:03 ` Borislav Petkov
2024-04-30 14:49 ` Kirill A. Shutemov
2024-05-02 13:22 ` Borislav Petkov
2024-05-02 13:38 ` Borislav Petkov
2024-04-09 20:42 ` [PATCH v4 0/4] x86/snp: Add kexec support Ashish Kalra
2024-04-09 20:42 ` Ashish Kalra [this message]
2024-04-09 20:42 ` [PATCH v4 2/4] x86/sev: add sev_es_enabled() function Ashish Kalra
2024-04-09 21:21 ` Borislav Petkov
2024-04-09 20:42 ` [PATCH v4 3/4] x86/boot/compressed: Skip Video Memory access in Decompressor for SEV-ES/SNP Ashish Kalra
2024-04-09 20:43 ` [PATCH v4 4/4] x86/snp: Convert shared memory back to private on kexec Ashish Kalra
2024-04-10 14:17 ` kernel test robot
2024-04-15 23:22 ` [PATCH v5 0/3] x86/snp: Add kexec support Ashish Kalra
2024-04-15 23:22 ` [PATCH v5 1/3] efi/x86: skip efi_arch_mem_reserve() in case of kexec Ashish Kalra
2024-04-24 14:48 ` Borislav Petkov
2024-04-24 21:17 ` Kalra, Ashish
2024-04-25 16:45 ` Kalra, Ashish
2024-04-26 14:21 ` Borislav Petkov
2024-04-26 14:47 ` Kalra, Ashish
2024-04-26 15:22 ` Borislav Petkov
2024-04-26 15:28 ` Kalra, Ashish
2024-04-26 15:34 ` Borislav Petkov
2024-04-26 16:32 ` Kalra, Ashish
2024-04-15 23:23 ` [PATCH v5 2/3] x86/boot/compressed: Skip Video Memory access in Decompressor for SEV-ES/SNP Ashish Kalra
2024-04-15 23:23 ` [PATCH v5 3/3] x86/snp: Convert shared memory back to private on kexec Ashish Kalra
2024-04-26 16:33 ` [PATCH v6 0/3] x86/snp: Add kexec support Ashish Kalra
2024-04-26 16:33 ` [PATCH v6 1/3] efi/x86: Fix EFI memory map corruption with kexec Ashish Kalra
2024-05-09 9:56 ` Ruirui Yang
2024-05-09 10:00 ` Dave Young
2024-05-10 18:36 ` Kalra, Ashish
2024-04-26 16:34 ` [PATCH v6 2/3] x86/boot/compressed: Skip Video Memory access in Decompressor for SEV-ES/SNP Ashish Kalra
2024-04-26 16:35 ` [PATCH v6 3/3] x86/snp: Convert shared memory back to private on kexec Ashish Kalra
2024-05-02 12:01 ` [PATCH v4 0/4] x86/snp: Add kexec support Alexander Graf
2024-05-02 12:18 ` Vitaly Kuznetsov
2024-05-03 8:32 ` Alexander Graf
2024-05-09 9:19 ` Vitaly Kuznetsov
2024-05-02 21:54 ` Kalra, Ashish
[not found] ` <20240409113010.465412-4-kirill.shutemov@linux.intel.com>
2024-04-18 14:37 ` [PATCHv10 03/18] cpu/hotplug: Add support for declaring CPU offlining not supported Borislav Petkov
2024-04-19 13:31 ` Kirill A. Shutemov
2024-04-23 13:17 ` Borislav Petkov
[not found] ` <20240409113010.465412-2-kirill.shutemov@linux.intel.com>
2024-04-18 16:03 ` [PATCHv10 01/18] x86/acpi: Extract ACPI MADT wakeup code into a separate file Borislav Petkov
2024-04-19 13:28 ` Kirill A. Shutemov
[not found] ` <20240409113010.465412-5-kirill.shutemov@linux.intel.com>
2024-04-23 16:02 ` [PATCHv10 04/18] cpu/hotplug, x86/acpi: Disable CPU offlining for ACPI MADT wakeup Borislav Petkov
2024-04-24 8:38 ` Kirill A. Shutemov
2024-04-24 13:50 ` Borislav Petkov
2024-04-24 14:35 ` Kirill A. Shutemov
2024-04-24 14:40 ` Dave Hansen
2024-04-24 14:51 ` Borislav Petkov
[not found] ` <20240409113010.465412-10-kirill.shutemov@linux.intel.com>
2024-04-27 16:47 ` [PATCHv10 09/18] x86/mm: Adding callbacks to prepare encrypted memory for kexec Borislav Petkov
[not found] ` <20240427170634.2397725-1-kirill.shutemov@linux.intel.com>
2024-05-02 13:45 ` [PATCHv10.1 " Borislav Petkov
2024-05-06 13:22 ` Kirill A. Shutemov
2024-05-06 14:21 ` Borislav Petkov
[not found] ` <20240409113010.465412-7-kirill.shutemov@linux.intel.com>
2024-04-28 17:25 ` [PATCHv10 06/18] x86/mm: Make x86_platform.guest.enc_status_change_*() return errno Borislav Petkov
2024-04-29 14:29 ` Kirill A. Shutemov
2024-04-29 14:53 ` Borislav Petkov
2024-05-03 16:29 ` Michael Kelley
[not found] ` <20240409113010.465412-11-kirill.shutemov@linux.intel.com>
2024-05-05 12:13 ` [PATCHv10 10/18] x86/tdx: Convert shared memory back to private on kexec Borislav Petkov
2024-05-06 15:37 ` Kirill A. Shutemov
2024-05-08 12:04 ` Borislav Petkov
2024-05-08 13:30 ` Kirill A. Shutemov
[not found] ` <20240409113010.465412-12-kirill.shutemov@linux.intel.com>
2024-05-08 12:12 ` [PATCHv10 11/18] x86/mm: Make e820_end_ram_pfn() cover E820_TYPE_ACPI ranges Borislav Petkov
[not found] ` <20240409113010.465412-14-kirill.shutemov@linux.intel.com>
2024-05-08 12:18 ` [PATCHv10 13/18] x86/acpi: Rename fields in acpi_madt_multiproc_wakeup structure Borislav Petkov
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