From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Tom Lendacky <thomas.lendacky@amd.com>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Michael Roth <michael.roth@amd.com>,
Joerg Roedel <jroedel@suse.de>, Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH v6 5/5] x86/sev: Add SNP-specific unaccepted memory support
Date: Fri, 9 Dec 2022 01:12:48 +0300 [thread overview]
Message-ID: <20221208221248.slltzm5ehnbltdee@box.shutemov.name> (raw)
In-Reply-To: <a46c897353203bf24bc104c314cd99dc68f5cdca.1670513353.git.thomas.lendacky@amd.com>
On Thu, Dec 08, 2022 at 09:29:13AM -0600, Tom Lendacky wrote:
> Add SNP-specific hooks to the unaccepted memory support in the boot
> path (__accept_memory()) and the core kernel (accept_memory()) in order
> to support booting SNP guests when unaccepted memory is present. Without
> this support, SNP guests will fail to boot and/or panic() when unaccepted
> memory is present in the EFI memory map.
>
> The process of accepting memory under SNP involves invoking the hypervisor
> to perform a page state change for the page to private memory and then
> issuing a PVALIDATE instruction to accept the page.
>
> Since the boot path and the core kernel paths perform similar operations,
> move the pvalidate_pages() and vmgexit_psc() functions into sev-shared.c
> to avoid code duplication.
>
> Create the new header file arch/x86/boot/compressed/sev.h because adding
> the function declaration to any of the existing SEV related header files
> pulls in too many other header files, causing the build to fail.
>
> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
> ---
> arch/x86/Kconfig | 1 +
> arch/x86/boot/compressed/mem.c | 3 +
> arch/x86/boot/compressed/sev.c | 54 ++++++++++++++-
> arch/x86/boot/compressed/sev.h | 23 +++++++
> arch/x86/include/asm/sev.h | 3 +
> arch/x86/kernel/sev-shared.c | 103 +++++++++++++++++++++++++++++
> arch/x86/kernel/sev.c | 112 ++++----------------------------
> arch/x86/mm/unaccepted_memory.c | 4 ++
> 8 files changed, 204 insertions(+), 99 deletions(-)
> create mode 100644 arch/x86/boot/compressed/sev.h
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index d88f61940aa7..0704d4795919 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -1549,6 +1549,7 @@ config AMD_MEM_ENCRYPT
> select INSTRUCTION_DECODER
> select ARCH_HAS_CC_PLATFORM
> select X86_MEM_ENCRYPT
> + select UNACCEPTED_MEMORY
> help
> Say yes to enable support for the encryption of system memory.
> This requires an AMD processor that supports Secure Memory
I think it misses "depends on EFI_STUB".
The code I've submitted contains "select EFI_STUB", but it causes build
issues for some configurations. I've changed it to "depends on" in git.
--
Kiryl Shutsemau / Kirill A. Shutemov
next prev parent reply other threads:[~2022-12-08 22:13 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 ` [PATCHv8 09/14] x86/mm: Provide helpers for unaccepted memory Kirill A. Shutemov
2022-12-07 1:49 ` [PATCHv8 10/14] x86/mm: Avoid load_unaligned_zeropad() stepping into " 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 [this message]
2022-12-09 14:18 ` Tom Lendacky
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