From: Borislav Petkov <bp@alien8.de>
To: Tom Lendacky <thomas.lendacky@amd.com>
Cc: linux-arch@vger.kernel.org, linux-efi@vger.kernel.org,
kvm@vger.kernel.org, linux-doc@vger.kernel.org, x86@kernel.org,
kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
kasan-dev@googlegroups.com, linux-mm@kvack.org,
iommu@lists.linux-foundation.org,
"Rik van Riel" <riel@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Toshimitsu Kani" <toshi.kani@hpe.com>,
"Arnd Bergmann" <arnd@arndb.de>,
"Jonathan Corbet" <corbet@lwn.net>,
"Matt Fleming" <matt@codeblueprint.co.uk>,
"Michael S. Tsirkin" <mst@redhat.com>,
"Joerg Roedel" <joro@8bytes.org>,
"Konrad Rzeszutek Wilk" <konrad.wilk@oracle.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Larry Woodman" <lwoodman@redhat.com>,
"Brijesh Singh" <brijesh.singh@amd.com>,
"Ingo Molnar" <mingo@redhat.com>,
"Andy Lutomirski" <luto@kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>,
"Andrey Ryabinin" <aryabinin@virtuozzo.com>,
"Alexander Potapenko" <glider@google.com>,
"Dave Young" <dyoung@redhat.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Dmitry Vyukov" <dvyukov@google.com>
Subject: Re: [PATCH v6 14/34] x86/mm: Insure that boot memory areas are mapped properly
Date: Sat, 10 Jun 2017 18:01:19 +0200 [thread overview]
Message-ID: <20170610160119.bnx5ir5dj3i27igx@pd.tnic> (raw)
In-Reply-To: <20170607191539.28645.70161.stgit@tlendack-t1.amdoffice.net>
On Wed, Jun 07, 2017 at 02:15:39PM -0500, Tom Lendacky wrote:
> The boot data and command line data are present in memory in a decrypted
> state and are copied early in the boot process. The early page fault
> support will map these areas as encrypted, so before attempting to copy
> them, add decrypted mappings so the data is accessed properly when copied.
>
> For the initrd, encrypt this data in place. Since the future mapping of the
> initrd area will be mapped as encrypted the data will be accessed properly.
>
> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
> ---
> arch/x86/include/asm/mem_encrypt.h | 11 +++++
> arch/x86/include/asm/pgtable.h | 3 +
> arch/x86/kernel/head64.c | 30 ++++++++++++--
> arch/x86/kernel/setup.c | 9 ++++
> arch/x86/mm/mem_encrypt.c | 77 ++++++++++++++++++++++++++++++++++++
> 5 files changed, 126 insertions(+), 4 deletions(-)
Some cleanups ontop in case you get to send v7:
diff --git a/arch/x86/include/asm/mem_encrypt.h b/arch/x86/include/asm/mem_encrypt.h
index 61a704945294..5959a42dd4d5 100644
--- a/arch/x86/include/asm/mem_encrypt.h
+++ b/arch/x86/include/asm/mem_encrypt.h
@@ -45,13 +45,8 @@ static inline void __init sme_early_decrypt(resource_size_t paddr,
{
}
-static inline void __init sme_map_bootdata(char *real_mode_data)
-{
-}
-
-static inline void __init sme_unmap_bootdata(char *real_mode_data)
-{
-}
+static inline void __init sme_map_bootdata(char *real_mode_data) { }
+static inline void __init sme_unmap_bootdata(char *real_mode_data) { }
static inline void __init sme_early_init(void)
{
diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
index 2321f05045e5..32ebbe0ab04d 100644
--- a/arch/x86/mm/mem_encrypt.c
+++ b/arch/x86/mm/mem_encrypt.c
@@ -132,6 +132,10 @@ static void __init __sme_map_unmap_bootdata(char *real_mode_data, bool map)
struct boot_params *boot_data;
unsigned long cmdline_paddr;
+ /* If SME is not active, the bootdata is in the correct state */
+ if (!sme_active())
+ return;
+
__sme_early_map_unmap_mem(real_mode_data, sizeof(boot_params), map);
boot_data = (struct boot_params *)real_mode_data;
@@ -142,40 +146,22 @@ static void __init __sme_map_unmap_bootdata(char *real_mode_data, bool map)
cmdline_paddr = boot_data->hdr.cmd_line_ptr |
((u64)boot_data->ext_cmd_line_ptr << 32);
- if (cmdline_paddr)
- __sme_early_map_unmap_mem(__va(cmdline_paddr),
- COMMAND_LINE_SIZE, map);
+ if (!cmdline_paddr)
+ return;
+
+ __sme_early_map_unmap_mem(__va(cmdline_paddr), COMMAND_LINE_SIZE, map);
+
+ sme_early_pgtable_flush();
}
void __init sme_unmap_bootdata(char *real_mode_data)
{
- /* If SME is not active, the bootdata is in the correct state */
- if (!sme_active())
- return;
-
- /*
- * The bootdata and command line aren't needed anymore so clear
- * any mapping of them.
- */
__sme_map_unmap_bootdata(real_mode_data, false);
-
- sme_early_pgtable_flush();
}
void __init sme_map_bootdata(char *real_mode_data)
{
- /* If SME is not active, the bootdata is in the correct state */
- if (!sme_active())
- return;
-
- /*
- * The bootdata and command line will not be encrypted, so they
- * need to be mapped as decrypted memory so they can be copied
- * properly.
- */
__sme_map_unmap_bootdata(real_mode_data, true);
-
- sme_early_pgtable_flush();
}
void __init sme_early_init(void)
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
next prev parent reply other threads:[~2017-06-10 16:01 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-07 19:13 [PATCH v6 00/34] x86: Secure Memory Encryption (AMD) Tom Lendacky
2017-06-07 19:13 ` [PATCH v6 01/34] x86: Document AMD Secure Memory Encryption (SME) Tom Lendacky
2017-06-07 19:13 ` [PATCH v6 02/34] x86/mm/pat: Set write-protect cache mode for full PAT support Tom Lendacky
2017-06-07 19:13 ` [PATCH v6 03/34] x86, mpparse, x86/acpi, x86/PCI, x86/dmi, SFI: Use memremap for RAM mappings Tom Lendacky
2017-06-07 19:13 ` [PATCH v6 04/34] x86/CPU/AMD: Add the Secure Memory Encryption CPU feature Tom Lendacky
2017-06-09 10:55 ` Borislav Petkov
2017-06-07 19:14 ` [PATCH v6 05/34] x86/CPU/AMD: Handle SME reduction in physical address size Tom Lendacky
2017-06-09 16:30 ` Borislav Petkov
2017-06-07 19:14 ` [PATCH v6 06/34] x86/mm: Add Secure Memory Encryption (SME) support Tom Lendacky
2017-06-09 16:43 ` Borislav Petkov
2017-06-07 19:14 ` [PATCH v6 07/34] x86/mm: Don't use phys_to_virt in ioremap() if SME is active Tom Lendacky
2017-06-07 19:14 ` [PATCH v6 08/34] x86/mm: Add support to enable SME in early boot processing Tom Lendacky
2017-06-07 19:14 ` [PATCH v6 09/34] x86/mm: Simplify p[gum]d_page() macros Tom Lendacky
2017-06-10 10:44 ` Borislav Petkov
2017-06-07 19:14 ` [PATCH v6 10/34] x86, x86/mm, x86/xen, olpc: Use __va() against just the physical address in cr3 Tom Lendacky
2017-06-07 22:06 ` Boris Ostrovsky
2017-06-08 13:42 ` Tom Lendacky
2017-06-08 20:51 ` Boris Ostrovsky
2017-06-08 21:02 ` Tom Lendacky
2017-06-08 21:17 ` Boris Ostrovsky
2017-06-08 22:01 ` [Xen-devel] " Andrew Cooper
2017-06-09 18:36 ` Tom Lendacky
2017-06-09 18:43 ` Boris Ostrovsky
2017-06-09 18:54 ` Andrew Cooper
2017-06-09 18:59 ` Tom Lendacky
2017-06-09 19:42 ` Boris Ostrovsky
2017-06-08 6:05 ` Andy Lutomirski
2017-06-08 22:38 ` Tom Lendacky
2017-06-09 18:46 ` Andy Lutomirski
2017-06-09 21:20 ` Tom Lendacky
2017-06-08 7:39 ` kbuild test robot
2017-06-07 19:15 ` [PATCH v6 11/34] x86/mm: Provide general kernel support for memory encryption Tom Lendacky
2017-06-07 19:15 ` [PATCH v6 12/34] x86/mm: Extend early_memremap() support with additional attrs Tom Lendacky
2017-06-07 19:15 ` [PATCH v6 13/34] x86/mm: Add support for early encrypt/decrypt of memory Tom Lendacky
2017-06-10 15:56 ` Borislav Petkov
2017-06-07 19:15 ` [PATCH v6 14/34] x86/mm: Insure that boot memory areas are mapped properly Tom Lendacky
2017-06-10 16:01 ` Borislav Petkov [this message]
2017-06-12 13:31 ` Tom Lendacky
2017-06-07 19:15 ` [PATCH v6 15/34] x86/boot/e820: Add support to determine the E820 type of an address Tom Lendacky
2017-06-07 19:16 ` [PATCH v6 16/34] efi: Add an EFI table address match function Tom Lendacky
2017-06-07 19:16 ` [PATCH v6 17/34] efi: Update efi_mem_type() to return an error rather than 0 Tom Lendacky
2017-06-07 19:16 ` [PATCH v6 18/34] x86/efi: Update EFI pagetable creation to work with SME Tom Lendacky
2017-06-11 19:44 ` Borislav Petkov
2017-06-07 19:16 ` [PATCH v6 19/34] x86/mm: Add support to access boot related data in the clear Tom Lendacky
2017-06-08 4:24 ` kbuild test robot
2017-06-07 19:16 ` [PATCH v6 20/34] x86, mpparse: Use memremap to map the mpf and mpc data Tom Lendacky
2017-06-14 16:07 ` Borislav Petkov
2017-06-14 17:06 ` Tom Lendacky
2017-06-14 17:27 ` Borislav Petkov
2017-06-07 19:16 ` [PATCH v6 21/34] x86/mm: Add support to access persistent memory in the clear Tom Lendacky
2017-06-07 19:17 ` [PATCH v6 22/34] x86/mm: Add support for changing the memory encryption attribute Tom Lendacky
2017-06-14 16:25 ` Borislav Petkov
2017-06-07 19:17 ` [PATCH v6 23/34] x86, realmode: Decrypt trampoline area if memory encryption is active Tom Lendacky
2017-06-14 16:24 ` Borislav Petkov
2017-06-14 16:38 ` Tom Lendacky
2017-06-07 19:17 ` [PATCH v6 24/34] x86, swiotlb: Add memory encryption support Tom Lendacky
2017-06-14 16:45 ` Borislav Petkov
2017-06-14 19:38 ` Tom Lendacky
2017-06-07 19:17 ` [PATCH v6 25/34] swiotlb: Add warnings for use of bounce buffers with SME Tom Lendacky
2017-06-08 5:53 ` kbuild test robot
2017-06-08 21:09 ` Tom Lendacky
2017-06-08 7:58 ` Christoph Hellwig
2017-06-08 23:04 ` Tom Lendacky
2017-06-14 16:50 ` Borislav Petkov
2017-06-14 19:49 ` Tom Lendacky
2017-06-15 9:08 ` Borislav Petkov
2017-06-15 13:23 ` Tom Lendacky
2017-06-07 19:17 ` [PATCH v6 26/34] iommu/amd: Allow the AMD IOMMU to work with memory encryption Tom Lendacky
2017-06-08 2:38 ` Nick Sarnie
2017-06-08 14:26 ` Tom Lendacky
2017-06-14 17:42 ` Borislav Petkov
2017-06-14 20:40 ` Tom Lendacky
2017-06-15 9:41 ` Borislav Petkov
2017-06-15 14:59 ` Tom Lendacky
2017-06-15 15:33 ` Borislav Petkov
2017-06-15 16:33 ` Tom Lendacky
2017-06-19 17:18 ` Borislav Petkov
2017-06-15 20:13 ` Konrad Rzeszutek Wilk
2017-06-21 15:37 ` Joerg Roedel
2017-06-21 16:59 ` Borislav Petkov
2017-06-21 18:40 ` Tom Lendacky
2017-06-07 19:17 ` [PATCH v6 27/34] x86, realmode: Check for memory encryption on the APs Tom Lendacky
2017-06-07 19:18 ` [PATCH v6 28/34] x86, drm, fbdev: Do not specify encrypted memory for video mappings Tom Lendacky
2017-06-07 19:18 ` [PATCH v6 29/34] kvm: x86: svm: Support Secure Memory Encryption within KVM Tom Lendacky
2017-06-15 9:55 ` Borislav Petkov
2017-06-07 19:18 ` [PATCH v6 30/34] x86/mm, kexec: Allow kexec to be used with SME Tom Lendacky
2017-06-15 10:03 ` Borislav Petkov
2017-06-15 17:43 ` Tom Lendacky
2017-06-07 19:18 ` [PATCH v6 31/34] x86/mm: Use proper encryption attributes with /dev/mem Tom Lendacky
2017-06-07 19:18 ` [PATCH v6 32/34] x86/mm: Add support to encrypt the kernel in-place Tom Lendacky
2017-06-07 19:19 ` [PATCH v6 33/34] x86/boot: Add early cmdline parsing for options with arguments Tom Lendacky
2017-06-07 19:19 ` [PATCH v6 34/34] x86/mm: Add support to make use of Secure Memory Encryption Tom Lendacky
2017-06-08 2:40 ` [PATCH v6 00/34] x86: Secure Memory Encryption (AMD) Nick Sarnie
2017-06-08 16:14 ` Tom Lendacky
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