From: Thomas Gleixner <tglx@linutronix.de>
To: Borislav Petkov <bp@alien8.de>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
mingo@redhat.com, dave.hansen@intel.com, luto@kernel.org,
peterz@infradead.org, sathyanarayanan.kuppuswamy@linux.intel.com,
aarcange@redhat.com, ak@linux.intel.com,
dan.j.williams@intel.com, david@redhat.com, hpa@zytor.com,
jgross@suse.com, jmattson@google.com, joro@8bytes.org,
jpoimboe@redhat.com, knsathya@kernel.org, pbonzini@redhat.com,
sdeep@vmware.com, seanjc@google.com, tony.luck@intel.com,
vkuznets@redhat.com, wanpengli@tencent.com, x86@kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCHv2 19/29] x86/topology: Disable CPU online/offline control for TDX guests
Date: Thu, 03 Feb 2022 22:26:41 +0100 [thread overview]
Message-ID: <87wnibd4ku.ffs@tglx> (raw)
In-Reply-To: <YfvuFADTO/f1UTG1@zn.tnic>
On Thu, Feb 03 2022 at 16:00, Borislav Petkov wrote:
> On Wed, Feb 02, 2022 at 01:11:56AM +0100, Thomas Gleixner wrote:
>> On Wed, Feb 02 2022 at 01:09, Thomas Gleixner wrote:
>>
>> > On Mon, Jan 24 2022 at 18:02, Kirill A. Shutemov wrote:
>> >> static bool intel_cc_platform_has(enum cc_attr attr)
>> >> {
>> >> - if (attr == CC_ATTR_GUEST_UNROLL_STRING_IO)
>> >> + switch (attr) {
>> >> + case CC_ATTR_GUEST_UNROLL_STRING_IO:
>> >> + case CC_ATTR_HOTPLUG_DISABLED:
>>
>> Not that I care much, but I faintly remember that I suggested that in
>> one of the gazillion of threads.
>
> Right, and yeah, adding a separate attribute is ok too but we already
> have a hotplug disable method. Why can't this call
>
> cpu_hotplug_disable()
>
> on the TDX init path somewhere and have this be even simpler?
That's daft. I rather have this explicit control which makes it obvious
what's going on.
Thanks,
tglx
next prev parent reply other threads:[~2022-02-03 21:26 UTC|newest]
Thread overview: 154+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-24 15:01 [PATCHv2 00/29] TDX Guest: TDX core support Kirill A. Shutemov
2022-01-24 15:01 ` [PATCHv2 01/29] x86/tdx: Detect running as a TDX guest in early boot Kirill A. Shutemov
2022-02-01 19:29 ` Thomas Gleixner
2022-02-01 23:14 ` Kirill A. Shutemov
2022-02-03 0:32 ` Josh Poimboeuf
2022-02-03 14:09 ` Kirill A. Shutemov
2022-02-03 15:13 ` Dave Hansen
2022-01-24 15:01 ` [PATCHv2 02/29] x86/tdx: Extend the cc_platform_has() API to support TDX guests Kirill A. Shutemov
2022-02-01 19:31 ` Thomas Gleixner
2022-01-24 15:01 ` [PATCHv2 03/29] x86/tdx: Add __tdx_module_call() and __tdx_hypercall() helper functions Kirill A. Shutemov
2022-02-01 19:58 ` Thomas Gleixner
2022-02-02 2:55 ` Kirill A. Shutemov
2022-02-02 10:59 ` Kai Huang
2022-02-03 14:44 ` Kirill A. Shutemov
2022-02-03 23:47 ` Kai Huang
2022-02-04 3:43 ` Kirill A. Shutemov
2022-02-04 9:51 ` Kai Huang
2022-02-04 13:20 ` Kirill A. Shutemov
2022-02-04 10:12 ` Kai Huang
2022-02-04 13:18 ` Kirill A. Shutemov
2022-02-05 0:06 ` Kai Huang
2022-02-02 17:08 ` Thomas Gleixner
2022-01-24 15:01 ` [PATCHv2 04/29] x86/traps: Add #VE support for TDX guest Kirill A. Shutemov
2022-02-01 21:02 ` Thomas Gleixner
2022-02-01 21:26 ` Sean Christopherson
2022-02-12 1:42 ` Kirill A. Shutemov
2022-01-24 15:01 ` [PATCHv2 05/29] x86/tdx: Add HLT support for TDX guests Kirill A. Shutemov
2022-01-29 14:53 ` Borislav Petkov
2022-01-29 22:30 ` [PATCHv2.1 " Kirill A. Shutemov
2022-02-01 21:21 ` Thomas Gleixner
2022-02-02 12:48 ` Kirill A. Shutemov
2022-02-02 17:17 ` Thomas Gleixner
2022-02-04 16:55 ` Kirill A. Shutemov
2022-02-07 22:52 ` Sean Christopherson
2022-02-09 14:34 ` Kirill A. Shutemov
2022-02-09 18:05 ` Sean Christopherson
2022-02-09 22:23 ` Kirill A. Shutemov
2022-02-10 1:21 ` Sean Christopherson
2022-01-24 15:01 ` [PATCHv2 06/29] x86/tdx: Add MSR " Kirill A. Shutemov
2022-02-01 21:38 ` Thomas Gleixner
2022-02-02 13:06 ` Kirill A. Shutemov
2022-02-02 17:18 ` Thomas Gleixner
2022-01-24 15:01 ` [PATCHv2 07/29] x86/tdx: Handle CPUID via #VE Kirill A. Shutemov
2022-02-01 21:39 ` Thomas Gleixner
2022-01-24 15:01 ` [PATCHv2 08/29] x86/tdx: Handle in-kernel MMIO Kirill A. Shutemov
2022-01-24 19:30 ` Josh Poimboeuf
2022-01-24 22:08 ` Kirill A. Shutemov
2022-01-24 23:04 ` Josh Poimboeuf
2022-01-24 22:40 ` Dave Hansen
2022-01-24 23:04 ` [PATCHv2.1 " Kirill A. Shutemov
2022-02-01 16:14 ` Borislav Petkov
2022-02-01 22:30 ` [PATCHv2 " Thomas Gleixner
2022-01-24 15:01 ` [PATCHv2 09/29] x86/tdx: Detect TDX at early kernel decompression time Kirill A. Shutemov
2022-02-01 18:30 ` Borislav Petkov
2022-02-01 22:33 ` Thomas Gleixner
2022-01-24 15:01 ` [PATCHv2 10/29] x86: Consolidate port I/O helpers Kirill A. Shutemov
2022-02-01 22:36 ` Thomas Gleixner
2022-01-24 15:01 ` [PATCHv2 11/29] x86/boot: Allow to hook up alternative " Kirill A. Shutemov
2022-02-01 19:02 ` Borislav Petkov
2022-02-01 22:39 ` Thomas Gleixner
2022-02-01 22:53 ` Thomas Gleixner
2022-02-02 17:20 ` Kirill A. Shutemov
2022-02-02 19:05 ` Thomas Gleixner
2022-01-24 15:01 ` [PATCHv2 12/29] x86/boot/compressed: Support TDX guest port I/O at decompression time Kirill A. Shutemov
2022-02-01 22:55 ` Thomas Gleixner
2022-01-24 15:01 ` [PATCHv2 13/29] x86/tdx: Add port I/O emulation Kirill A. Shutemov
2022-02-01 23:01 ` Thomas Gleixner
2022-02-02 6:22 ` Borislav Petkov
2022-01-24 15:02 ` [PATCHv2 14/29] x86/tdx: Early boot handling of port I/O Kirill A. Shutemov
2022-02-01 23:02 ` Thomas Gleixner
2022-02-02 10:09 ` Borislav Petkov
2022-01-24 15:02 ` [PATCHv2 15/29] x86/tdx: Wire up KVM hypercalls Kirill A. Shutemov
2022-02-01 23:05 ` Thomas Gleixner
2022-01-24 15:02 ` [PATCHv2 16/29] x86/boot: Add a trampoline for booting APs via firmware handoff Kirill A. Shutemov
2022-02-01 23:06 ` Thomas Gleixner
2022-02-02 11:27 ` Borislav Petkov
2022-02-04 11:27 ` Kuppuswamy, Sathyanarayanan
2022-02-04 13:49 ` Borislav Petkov
2022-02-15 21:36 ` Kirill A. Shutemov
2022-02-16 10:07 ` Borislav Petkov
2022-02-16 14:10 ` Kirill A. Shutemov
2022-02-10 0:25 ` Kai Huang
2022-01-24 15:02 ` [PATCHv2 17/29] x86/acpi, x86/boot: Add multiprocessor wake-up support Kirill A. Shutemov
2022-02-01 23:27 ` Thomas Gleixner
2022-02-05 12:37 ` Kuppuswamy, Sathyanarayanan
2022-01-24 15:02 ` [PATCHv2 18/29] x86/boot: Avoid #VE during boot for TDX platforms Kirill A. Shutemov
2022-02-02 0:04 ` Thomas Gleixner
2022-02-11 16:13 ` Kirill A. Shutemov
2022-01-24 15:02 ` [PATCHv2 19/29] x86/topology: Disable CPU online/offline control for TDX guests Kirill A. Shutemov
2022-02-02 0:09 ` Thomas Gleixner
2022-02-02 0:11 ` Thomas Gleixner
2022-02-03 15:00 ` Borislav Petkov
2022-02-03 21:26 ` Thomas Gleixner [this message]
2022-01-24 15:02 ` [PATCHv2 20/29] x86/tdx: Get page shared bit info from the TDX module Kirill A. Shutemov
2022-02-02 0:14 ` Thomas Gleixner
2022-02-07 22:27 ` Sean Christopherson
2022-02-07 10:44 ` Borislav Petkov
2022-01-24 15:02 ` [PATCHv2 21/29] x86/tdx: Exclude shared bit from __PHYSICAL_MASK Kirill A. Shutemov
2022-02-02 0:18 ` Thomas Gleixner
2022-01-24 15:02 ` [PATCHv2 22/29] x86/tdx: Make pages shared in ioremap() Kirill A. Shutemov
2022-02-02 0:25 ` Thomas Gleixner
2022-02-02 19:27 ` Kirill A. Shutemov
2022-02-02 19:47 ` Thomas Gleixner
2022-02-07 16:27 ` Borislav Petkov
2022-02-07 16:57 ` Dave Hansen
2022-02-07 17:28 ` Borislav Petkov
2022-02-14 22:09 ` Kirill A. Shutemov
2022-02-15 10:50 ` Borislav Petkov
2022-02-15 14:49 ` Tom Lendacky
2022-02-15 15:41 ` Kirill A. Shutemov
2022-02-15 15:55 ` Tom Lendacky
2022-02-15 16:27 ` Kirill A. Shutemov
2022-02-15 16:34 ` Dave Hansen
2022-02-15 17:33 ` Kirill A. Shutemov
2022-02-16 9:58 ` Borislav Petkov
2022-02-16 15:37 ` Kirill A. Shutemov
2022-02-17 15:24 ` Borislav Petkov
2022-01-24 15:02 ` [PATCHv2 23/29] x86/tdx: Add helper to convert memory between shared and private Kirill A. Shutemov
2022-02-02 0:35 ` Thomas Gleixner
2022-02-08 12:12 ` Borislav Petkov
2022-02-09 23:21 ` Kirill A. Shutemov
2022-01-24 15:02 ` [PATCHv2 24/29] x86/mm/cpa: Add support for TDX shared memory Kirill A. Shutemov
2022-02-02 1:27 ` Thomas Gleixner
2022-01-24 15:02 ` [PATCHv2 25/29] x86/kvm: Use bounce buffers for TD guest Kirill A. Shutemov
2022-01-24 15:02 ` [PATCHv2 26/29] x86/tdx: ioapic: Add shared bit for IOAPIC base address Kirill A. Shutemov
2022-02-02 1:33 ` Thomas Gleixner
2022-02-04 22:09 ` Yamahata, Isaku
2022-02-04 22:31 ` Kirill A. Shutemov
2022-02-07 14:08 ` Tom Lendacky
2022-01-24 15:02 ` [PATCHv2 27/29] ACPICA: Avoid cache flush on TDX guest Kirill A. Shutemov
2022-01-24 15:02 ` [PATCHv2 28/29] x86/tdx: Warn about unexpected WBINVD Kirill A. Shutemov
2022-02-02 1:46 ` Thomas Gleixner
2022-02-04 21:35 ` Kirill A. Shutemov
2022-01-24 15:02 ` [PATCHv2 29/29] Documentation/x86: Document TDX kernel architecture Kirill A. Shutemov
2022-02-24 9:08 ` Xiaoyao Li
2022-02-09 10:56 ` [PATCHv2 00/29] TDX Guest: TDX core support Kai Huang
2022-02-09 11:08 ` Borislav Petkov
2022-02-09 11:30 ` Kai Huang
2022-02-09 11:40 ` Borislav Petkov
2022-02-09 11:48 ` Kai Huang
2022-02-09 11:56 ` Borislav Petkov
2022-02-09 11:58 ` Kai Huang
2022-02-09 16:50 ` Sean Christopherson
2022-02-09 19:11 ` Borislav Petkov
2022-02-09 20:07 ` Sean Christopherson
2022-02-09 20:36 ` Borislav Petkov
2022-02-10 0:05 ` Kai Huang
2022-02-16 16:08 ` Sean Christopherson
2022-02-16 15:48 ` Kirill A. Shutemov
2022-02-17 15:19 ` Borislav Petkov
2022-02-17 15:26 ` Kirill A. Shutemov
2022-02-17 15:34 ` Borislav Petkov
2022-02-17 15:29 ` Sean Christopherson
2022-02-17 15:31 ` Borislav Petkov
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