From: Borislav Petkov <bp@alien8.de>
To: Brijesh Singh <brijesh.singh@amd.com>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, linux-efi@vger.kernel.org,
platform-driver-x86@vger.kernel.org, linux-coco@lists.linux.dev,
linux-mm@kvack.org, linux-crypto@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Joerg Roedel <jroedel@suse.de>,
Tom Lendacky <thomas.lendacky@amd.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Ard Biesheuvel <ardb@kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>,
Andy Lutomirski <luto@kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Sergio Lopez <slp@redhat.com>, Peter Gonda <pgonda@google.com>,
Peter Zijlstra <peterz@infradead.org>,
Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
David Rientjes <rientjes@google.com>,
Dov Murik <dovmurik@linux.ibm.com>,
Tobin Feldman-Fitzthum <tobin@ibm.com>,
Michael Roth <michael.roth@amd.com>,
Vlastimil Babka <vbabka@suse.cz>,
tony.luck@intel.com, brijesh.ksingh@gmail.com
Subject: Re: [PATCH Part1 RFC v4 24/36] x86/compressed/acpi: move EFI config table access to common code
Date: Thu, 19 Aug 2021 12:47:59 +0200 [thread overview]
Message-ID: <YR42323cUxsbQo5h@zn.tnic> (raw)
In-Reply-To: <20210707181506.30489-25-brijesh.singh@amd.com>
On Wed, Jul 07, 2021 at 01:14:54PM -0500, Brijesh Singh wrote:
> From: Michael Roth <michael.roth@amd.com>
>
> Future patches for SEV-SNP-validated CPUID will also require early
> parsing of the EFI configuration. Move the related code into a set of
> helpers that can be re-used for that purpose.
>
> Signed-off-by: Michael Roth <michael.roth@amd.com>
> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
> ---
> arch/x86/boot/compressed/Makefile | 1 +
> arch/x86/boot/compressed/acpi.c | 124 +++++---------
> arch/x86/boot/compressed/efi-config-table.c | 180 ++++++++++++++++++++
> arch/x86/boot/compressed/misc.h | 50 ++++++
> 4 files changed, 272 insertions(+), 83 deletions(-)
> create mode 100644 arch/x86/boot/compressed/efi-config-table.c
arch/x86/boot/compressed/efi.c
should be good enough.
And in general, this patch is hard to review because it does a bunch of
things at the same time. You should split it:
- the first patch sould carve out only the functionality into helpers
without adding or changing the existing functionality.
- later ones should add the new functionality, in single logical steps.
Some preliminary comments below as far as I can:
> diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
> index 431bf7f846c3..b41aecfda49c 100644
> --- a/arch/x86/boot/compressed/Makefile
> +++ b/arch/x86/boot/compressed/Makefile
> @@ -100,6 +100,7 @@ endif
> vmlinux-objs-$(CONFIG_ACPI) += $(obj)/acpi.o
>
> vmlinux-objs-$(CONFIG_EFI_MIXED) += $(obj)/efi_thunk_$(BITS).o
> +vmlinux-objs-$(CONFIG_EFI) += $(obj)/efi-config-table.o
> efi-obj-$(CONFIG_EFI_STUB) = $(objtree)/drivers/firmware/efi/libstub/lib.a
>
> $(obj)/vmlinux: $(vmlinux-objs-y) $(efi-obj-y) FORCE
> diff --git a/arch/x86/boot/compressed/acpi.c b/arch/x86/boot/compressed/acpi.c
> index 8bcbcee54aa1..e087dcaf43b3 100644
> --- a/arch/x86/boot/compressed/acpi.c
> +++ b/arch/x86/boot/compressed/acpi.c
> @@ -24,42 +24,36 @@ struct mem_vector immovable_mem[MAX_NUMNODES*2];
> * Search EFI system tables for RSDP. If both ACPI_20_TABLE_GUID and
> * ACPI_TABLE_GUID are found, take the former, which has more features.
> */
> +#ifdef CONFIG_EFI
> +static bool
> +rsdp_find_fn(efi_guid_t guid, unsigned long vendor_table, bool efi_64,
> + void *opaque)
> +{
> + acpi_physical_address *rsdp_addr = opaque;
> +
> + if (!(efi_guidcmp(guid, ACPI_TABLE_GUID))) {
> + *rsdp_addr = vendor_table;
> + } else if (!(efi_guidcmp(guid, ACPI_20_TABLE_GUID))) {
> + *rsdp_addr = vendor_table;
> + return false;
No "return false" in the ACPI_TABLE_GUID branch above? Maybe this has to
do with the preference to ACPI_20_TABLE_GUID.
In any case, this looks silly. Please do the iteration simple
and stupid without the function pointer and get rid of that
efi_foreach_conf_entry() thing - this is not firmware.
> diff --git a/arch/x86/boot/compressed/efi-config-table.c b/arch/x86/boot/compressed/efi-config-table.c
> new file mode 100644
> index 000000000000..d1a34aa7cefd
> --- /dev/null
> +++ b/arch/x86/boot/compressed/efi-config-table.c
...
> +/*
If you're going to add proper comments, make them kernel-doc. I.e., it
should start with
/**
and then use
./scripts/kernel-doc -none arch/x86/boot/compressed/efi-config-table.c
to check them all they're proper.
> + * Given boot_params, retrieve the physical address of EFI system table.
> + *
> + * @boot_params: pointer to boot_params
> + * @sys_table_pa: location to store physical address of system table
> + * @is_efi_64: location to store whether using 64-bit EFI or not
> + *
> + * Returns 0 on success. On error, return params are left unchanged.
> + */
> +int
> +efi_bp_get_system_table(struct boot_params *boot_params,
There's no need for the "_bp_" - just efi_get_system_table(). Ditto for
the other naming.
I'll review the rest properly after you've split it.
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2021-08-19 10:47 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-07 18:14 [PATCH Part1 RFC v4 00/36] Add AMD Secure Nested Paging (SEV-SNP) Guest Support Brijesh Singh
2021-07-07 18:14 ` [PATCH Part1 RFC v4 01/36] x86/sev: shorten GHCB terminate macro names Brijesh Singh
2021-07-07 18:14 ` [PATCH Part1 RFC v4 02/36] x86/sev: Save the negotiated GHCB version Brijesh Singh
2021-08-10 9:17 ` Borislav Petkov
2021-08-10 13:15 ` Brijesh Singh
2021-08-10 10:01 ` Borislav Petkov
2021-08-10 13:17 ` Brijesh Singh
2021-07-07 18:14 ` [PATCH Part1 RFC v4 03/36] x86/sev: Add support for hypervisor feature VMGEXIT Brijesh Singh
2021-08-10 11:22 ` Borislav Petkov
2021-08-10 13:39 ` Brijesh Singh
2021-08-10 14:03 ` Borislav Petkov
2021-07-07 18:14 ` [PATCH Part1 RFC v4 04/36] x86/mm: Add sev_feature_enabled() helper Brijesh Singh
2021-07-08 8:50 ` Dr. David Alan Gilbert
2021-07-08 8:53 ` Paolo Bonzini
2021-08-10 11:25 ` Borislav Petkov
2021-08-10 14:57 ` Brijesh Singh
2021-07-07 18:14 ` [PATCH Part1 RFC v4 05/36] x86/sev: Define the Linux specific guest termination reasons Brijesh Singh
2021-08-10 11:33 ` Borislav Petkov
2021-08-10 14:59 ` Brijesh Singh
2021-08-10 19:30 ` Tom Lendacky
2021-08-10 21:52 ` Borislav Petkov
2021-07-07 18:14 ` [PATCH Part1 RFC v4 06/36] x86/sev: check SEV-SNP features support Brijesh Singh
2021-07-07 18:14 ` [PATCH Part1 RFC v4 07/36] x86/sev: Add a helper for the PVALIDATE instruction Brijesh Singh
2021-07-07 18:14 ` [PATCH Part1 RFC v4 08/36] x86/sev: check the vmpl level Brijesh Singh
2021-08-13 7:25 ` Borislav Petkov
2021-08-13 13:13 ` Brijesh Singh
2021-08-13 15:16 ` Borislav Petkov
2021-07-07 18:14 ` [PATCH Part1 RFC v4 09/36] x86/compressed: Add helper for validating pages in the decompression stage Brijesh Singh
2021-08-13 10:22 ` Borislav Petkov
2021-08-13 14:21 ` Brijesh Singh
2021-08-13 15:19 ` Borislav Petkov
2021-07-07 18:14 ` [PATCH Part1 RFC v4 10/36] x86/compressed: Register GHCB memory when SEV-SNP is active Brijesh Singh
2021-08-13 10:47 ` Borislav Petkov
2021-07-07 18:14 ` [PATCH Part1 RFC v4 11/36] x86/sev: " Brijesh Singh
2021-07-07 18:14 ` [PATCH Part1 RFC v4 12/36] x86/sev: Add helper for validating pages in early enc attribute changes Brijesh Singh
2021-08-13 11:13 ` Borislav Petkov
2021-07-07 18:14 ` [PATCH Part1 RFC v4 13/36] x86/kernel: Make the bss.decrypted section shared in RMP table Brijesh Singh
2021-08-13 17:09 ` Borislav Petkov
2021-07-07 18:14 ` [PATCH Part1 RFC v4 14/36] x86/kernel: Validate rom memory before accessing when SEV-SNP is active Brijesh Singh
2021-07-07 18:14 ` [PATCH Part1 RFC v4 15/36] x86/mm: Add support to validate memory when changing C-bit Brijesh Singh
2021-08-17 17:27 ` Borislav Petkov
2021-08-17 18:07 ` Brijesh Singh
2021-08-17 18:17 ` Borislav Petkov
2021-08-17 18:18 ` Brijesh Singh
2021-08-17 20:34 ` Brijesh Singh
2021-08-17 20:44 ` Borislav Petkov
2021-07-07 18:14 ` [PATCH Part1 RFC v4 16/36] KVM: SVM: define new SEV_FEATURES field in the VMCB Save State Area Brijesh Singh
2021-08-17 17:54 ` Borislav Petkov
2021-08-17 17:59 ` Borislav Petkov
2021-08-17 18:11 ` Brijesh Singh
2021-07-07 18:14 ` [PATCH Part1 RFC v4 17/36] KVM: SVM: Create a separate mapping for the SEV-ES save area Brijesh Singh
2021-07-07 18:14 ` [PATCH Part1 RFC v4 18/36] KVM: SVM: Create a separate mapping for the GHCB " Brijesh Singh
2021-07-07 18:14 ` [PATCH Part1 RFC v4 19/36] KVM: SVM: Update the SEV-ES save area mapping Brijesh Singh
2021-07-07 18:14 ` [PATCH Part1 RFC v4 20/36] x86/sev: Use SEV-SNP AP creation to start secondary CPUs Brijesh Singh
2021-08-17 20:04 ` Borislav Petkov
2021-08-17 22:13 ` Tom Lendacky
2021-08-18 8:38 ` Borislav Petkov
2021-07-07 18:14 ` [PATCH Part1 RFC v4 21/36] x86/head/64: set up a startup %gs for stack protector Brijesh Singh
2021-08-19 9:34 ` Borislav Petkov
2021-07-07 18:14 ` [PATCH Part1 RFC v4 22/36] x86/sev: move MSR-based VMGEXITs for CPUID to helper Brijesh Singh
2021-08-19 9:45 ` Borislav Petkov
2021-08-19 15:37 ` Michael Roth
2021-08-19 16:46 ` Borislav Petkov
2021-08-20 3:29 ` Michael Roth
2021-08-23 4:50 ` Borislav Petkov
2021-07-07 18:14 ` [PATCH Part1 RFC v4 23/36] KVM: x86: move lookup of indexed CPUID leafs " Brijesh Singh
2021-08-19 10:07 ` Borislav Petkov
2021-07-07 18:14 ` [PATCH Part1 RFC v4 24/36] x86/compressed/acpi: move EFI config table access to common code Brijesh Singh
2021-08-19 10:47 ` Borislav Petkov [this message]
2021-08-19 14:58 ` Michael Roth
2021-08-19 17:09 ` Borislav Petkov
2021-08-19 23:42 ` Michael Roth
2021-08-23 4:52 ` Borislav Petkov
2021-07-07 18:14 ` [PATCH Part1 RFC v4 25/36] x86/boot: Add Confidential Computing type to setup_data Brijesh Singh
2021-08-19 11:06 ` Borislav Petkov
2021-07-07 18:14 ` [PATCH Part1 RFC v4 26/36] x86/compressed/64: enable SEV-SNP-validated CPUID in #VC handler Brijesh Singh
2021-07-07 18:14 ` [PATCH Part1 RFC v4 27/36] x86/boot: add a pointer to Confidential Computing blob in bootparams Brijesh Singh
2021-07-07 18:14 ` [PATCH Part1 RFC v4 28/36] x86/compressed/64: store Confidential Computing blob address " Brijesh Singh
2021-07-07 18:14 ` [PATCH Part1 RFC v4 29/36] x86/compressed/64: add identity mapping for Confidential Computing blob Brijesh Singh
2021-07-07 18:15 ` [PATCH Part1 RFC v4 30/36] x86/sev: enable SEV-SNP-validated CPUID in #VC handlers Brijesh Singh
2021-07-07 18:15 ` [PATCH Part1 RFC v4 31/36] x86/sev: Provide support for SNP guest request NAEs Brijesh Singh
2021-07-07 18:15 ` [PATCH Part1 RFC v4 32/36] x86/sev: Add snp_msg_seqno() helper Brijesh Singh
2021-07-07 18:15 ` [PATCH Part1 RFC v4 33/36] x86/sev: Register SNP guest request platform device Brijesh Singh
2021-07-07 18:15 ` [PATCH Part1 RFC v4 34/36] virt: Add SEV-SNP guest driver Brijesh Singh
2021-07-07 18:15 ` [PATCH Part1 RFC v4 35/36] virt: sevguest: Add support to derive key Brijesh Singh
2021-07-07 18:15 ` [PATCH Part1 RFC v4 36/36] virt: sevguest: Add support to get extended report Brijesh Singh
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