From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Borislav Petkov <bp@alien8.de>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
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>,
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>,
Varad Gautam <varad.gautam@suse.com>,
Dario Faggioli <dfaggioli@suse.com>,
Dave Hansen <dave.hansen@intel.com>,
Brijesh Singh <brijesh.singh@amd.com>,
Mike Rapoport <rppt@kernel.org>,
David Hildenbrand <david@redhat.com>,
x86@kernel.org, linux-mm@kvack.org, linux-coco@lists.linux.dev,
linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCHv5 06/12] x86/boot/compressed: Handle unaccepted memory
Date: Fri, 6 May 2022 18:30:13 +0300 [thread overview]
Message-ID: <20220506153013.e6v4q2qhuhqumfiu@box.shutemov.name> (raw)
In-Reply-To: <YnE4ZzzVrxUnr3Uv@zn.tnic>
On Tue, May 03, 2022 at 04:12:55PM +0200, Borislav Petkov wrote:
> On Mon, Apr 25, 2022 at 06:39:28AM +0300, Kirill A. Shutemov wrote:
> > diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
> > index 411b268bc0a2..59db90626042 100644
> > --- a/arch/x86/boot/compressed/kaslr.c
> > +++ b/arch/x86/boot/compressed/kaslr.c
> > @@ -725,10 +725,20 @@ process_efi_entries(unsigned long minimum, unsigned long image_size)
> > * but in practice there's firmware where using that memory leads
> > * to crashes.
> > *
> > - * Only EFI_CONVENTIONAL_MEMORY is guaranteed to be free.
> > + * Only EFI_CONVENTIONAL_MEMORY and EFI_UNACCEPTED_MEMORY (if
> > + * supported) are guaranteed to be free.
> > */
> > - if (md->type != EFI_CONVENTIONAL_MEMORY)
> > +
> > + switch (md->type) {
> > + case EFI_CONVENTIONAL_MEMORY:
> > + break;
> > + case EFI_UNACCEPTED_MEMORY:
> > + if (IS_ENABLED(CONFIG_UNACCEPTED_MEMORY))
> > + break;
> > continue;
> > + default:
> > + continue;
> > + }
>
> Is there any special reason for this to be a switch-case or can it
> simply be a compound conditional if (bla...) ?
The equivalent 'if' statement is something like:
if (md->type != EFI_CONVENTIONAL_MEMORY &&
!(md->type == EFI_UNACCEPTED_MEMORY && IS_ENABLED(CONFIG_UNACCEPTED_MEMORY)))
continue;
I find it harder to follow.
Do you want me to change to the 'if' anyway?
--
Kirill A. Shutemov
next prev parent reply other threads:[~2022-05-06 15:28 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-25 3:39 [PATCHv5 00/12] mm, x86/cc: Implement support for unaccepted memory Kirill A. Shutemov
2022-04-25 3:39 ` [PATCHv5 01/12] x86/boot/: Centralize __pa()/__va() definitions Kirill A. Shutemov
2022-04-25 7:37 ` David Hildenbrand
2022-04-25 7:52 ` Mike Rapoport
2022-04-25 3:39 ` [PATCHv5 02/12] mm: Add support for unaccepted memory Kirill A. Shutemov
2022-04-28 10:05 ` Borislav Petkov
2022-05-03 20:21 ` David Hildenbrand
2022-05-06 0:54 ` Kirill A. Shutemov
2022-04-25 3:39 ` [PATCHv5 03/12] efi/x86: Get full memory map in allocate_e820() Kirill A. Shutemov
2022-04-27 20:25 ` Borislav Petkov
2022-04-27 23:48 ` Kirill A. Shutemov
2022-04-28 10:02 ` Borislav Petkov
2022-04-25 3:39 ` [PATCHv5 04/12] x86/boot: Add infrastructure required for unaccepted memory support Kirill A. Shutemov
2022-04-29 10:58 ` Wander Lairson Costa
2022-05-02 13:38 ` Kirill A. Shutemov
2022-04-25 3:39 ` [PATCHv5 05/12] efi/x86: Implement support for unaccepted memory Kirill A. Shutemov
2022-04-29 10:53 ` Borislav Petkov
2022-05-02 13:40 ` Kirill A. Shutemov
2022-04-25 3:39 ` [PATCHv5 06/12] x86/boot/compressed: Handle " Kirill A. Shutemov
2022-04-27 0:17 ` Michael Roth
2022-04-27 14:19 ` Kirill A. Shutemov
2022-05-03 14:15 ` Borislav Petkov
2022-04-29 13:10 ` Wander Lairson Costa
2022-05-03 14:12 ` Borislav Petkov
2022-05-06 15:30 ` Kirill A. Shutemov [this message]
2022-05-10 11:03 ` Borislav Petkov
2022-05-13 5:34 ` Dionna Amalie Glaze
2022-05-13 9:01 ` Borislav Petkov
2022-05-13 14:45 ` Kirill A. Shutemov
2022-05-16 6:46 ` Xu, Min M
2022-05-31 22:40 ` Dionna Amalie Glaze
2022-06-01 15:49 ` Gupta, Pankaj
2022-06-01 16:20 ` Dionna Amalie Glaze
2022-06-01 19:34 ` Randy Dunlap
2022-06-01 21:19 ` Gupta, Pankaj
2022-06-02 12:51 ` Gupta, Pankaj
2022-06-02 15:31 ` Dionna Amalie Glaze
2022-06-07 17:28 ` Dionna Amalie Glaze
2022-06-07 18:15 ` Gupta, Pankaj
2022-04-25 3:39 ` [PATCHv5 07/12] x86/mm: Reserve unaccepted memory bitmap Kirill A. Shutemov
2022-04-29 13:19 ` Wander Lairson Costa
2022-05-04 11:04 ` Borislav Petkov
2022-04-25 3:39 ` [PATCHv5 08/12] x86/mm: Provide helpers for unaccepted memory Kirill A. Shutemov
2022-05-04 11:12 ` Borislav Petkov
2022-05-06 16:13 ` Kirill A. Shutemov
2022-05-10 18:32 ` Borislav Petkov
2022-05-11 1:15 ` Kirill A. Shutemov
2022-05-11 9:07 ` Borislav Petkov
2022-04-25 3:39 ` [PATCHv5 09/12] x86/tdx: Make _tdx_hypercall() and __tdx_module_call() available in boot stub Kirill A. Shutemov
2022-04-25 3:39 ` [PATCHv5 10/12] x86/tdx: Unaccepted memory support Kirill A. Shutemov
2022-05-05 10:12 ` Borislav Petkov
2022-05-06 20:44 ` Kirill A. Shutemov
2022-05-11 1:19 ` Kirill A. Shutemov
2022-05-11 9:13 ` Borislav Petkov
2022-04-25 3:39 ` [PATCHv5 11/12] mm/vmstat: Add counter for memory accepting Kirill A. Shutemov
2022-04-25 3:39 ` [PATCHv5 12/12] x86/mm: Report unaccepted memory in /proc/meminfo Kirill A. Shutemov
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