From: Dave Hansen <dave.hansen@intel.com>
To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Dan Williams <dan.j.williams@intel.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@linux.intel.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Andi Kleen <ak@linux.intel.com>,
David Hildenbrand <david@redhat.com>,
"H. Peter Anvin" <hpa@zytor.com>, Juergen Gross <jgross@suse.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Kuppuswamy Sathyanarayanan <knsathya@kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
sdeep@vmware.com, Sean Christopherson <seanjc@google.com>,
"Luck, Tony" <tony.luck@intel.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
Brijesh Singh <brijesh.singh@amd.com>, X86 ML <x86@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCHv4 29/30] ACPICA: Avoid cache flush on TDX guest
Date: Mon, 28 Feb 2022 08:46:57 -0800 [thread overview]
Message-ID: <dd2d7c49-45bd-e8cd-a3c2-533e53f0bc4e@intel.com> (raw)
In-Reply-To: <20220228163713.5eewdwcqhmulsp4z@black.fi.intel.com>
On 2/28/22 08:37, Kirill A. Shutemov wrote:
>> Agree, why is this marked as "TODO"? The cache flushes associated with
>> ACPI sleep states are to flush cache before bare metal power loss to
>> CPU caches and bare metal transition of DDR in self-refresh mode. If a
>> cache flush is required it is the responsibility of the hypervisor.
>> Either it is safe for all guests or it is unsafe for all guests, not
>> TD specific.
> Do we have "any VM" check? I can't find it right away.
Yes:
> #define X86_FEATURE_HYPERVISOR ( 4*32+31) /* Running on a hypervisor */
I'm pretty sure an earlier version of this patch used it.
next prev parent reply other threads:[~2022-02-28 16:47 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-24 15:56 [PATCHv4 00/30] TDX Guest: TDX core support Kirill A. Shutemov
2022-02-24 15:56 ` [PATCHv4 01/30] x86/mm: Fix warning on build with X86_MEM_ENCRYPT=y Kirill A. Shutemov
2022-02-24 16:06 ` Dave Hansen
2022-02-27 22:01 ` Josh Poimboeuf
2022-02-28 16:20 ` Kirill A. Shutemov
2022-02-28 16:40 ` Josh Poimboeuf
2022-02-28 16:51 ` Dave Hansen
2022-02-28 17:11 ` Josh Poimboeuf
2022-03-01 8:48 ` Borislav Petkov
2022-02-24 15:56 ` [PATCHv4 02/30] x86/tdx: Detect running as a TDX guest in early boot Kirill A. Shutemov
2022-02-24 16:16 ` Dave Hansen
2022-02-24 15:56 ` [PATCHv4 03/30] x86/tdx: Provide common base for SEAMCALL and TDCALL C wrappers Kirill A. Shutemov
2022-02-24 16:35 ` Dave Hansen
2022-02-24 23:10 ` Kirill A. Shutemov
2022-02-25 0:41 ` Dave Hansen
2022-02-25 10:39 ` Kai Huang
2022-02-25 15:46 ` Kirill A. Shutemov
2022-02-25 16:12 ` Dave Hansen
2022-02-24 15:56 ` [PATCHv4 04/30] x86/tdx: Add __tdx_module_call() and __tdx_hypercall() helper functions Kirill A. Shutemov
2022-02-24 17:01 ` Dave Hansen
2022-02-24 23:29 ` Kirill A. Shutemov
2022-02-24 15:56 ` [PATCHv4 05/30] x86/tdx: Extend the confidential computing API to support TDX guests Kirill A. Shutemov
2022-02-24 17:54 ` Dave Hansen
2022-02-24 23:54 ` Kirill A. Shutemov
2022-02-25 0:51 ` Dave Hansen
2022-02-24 15:56 ` [PATCHv4 06/30] x86/tdx: Exclude shared bit from __PHYSICAL_MASK Kirill A. Shutemov
2022-02-24 15:56 ` [PATCHv4 07/30] x86/traps: Add #VE support for TDX guest Kirill A. Shutemov
2022-02-24 18:36 ` Dave Hansen
2022-02-25 19:30 ` Kirill A. Shutemov
2022-02-25 19:46 ` Dave Hansen
2022-02-24 15:56 ` [PATCHv4 08/30] x86/tdx: Add HLT support for TDX guests Kirill A. Shutemov
2022-02-24 18:42 ` Dave Hansen
2022-02-24 15:56 ` [PATCHv4 09/30] x86/tdx: Add MSR " Kirill A. Shutemov
2022-02-24 18:52 ` Dave Hansen
2022-02-24 19:04 ` Sean Christopherson
2022-02-24 19:36 ` Dave Hansen
2022-02-26 21:35 ` Kirill A. Shutemov
2022-02-24 15:56 ` [PATCHv4 10/30] x86/tdx: Handle CPUID via #VE Kirill A. Shutemov
2022-02-24 19:04 ` Dave Hansen
2022-02-27 1:07 ` Kirill A. Shutemov
2022-02-28 16:41 ` Dave Hansen
2022-02-28 22:53 ` Kirill A. Shutemov
2022-02-28 23:05 ` Dave Hansen
2022-02-28 23:31 ` Kirill A. Shutemov
2022-02-28 23:37 ` Dave Hansen
2022-02-24 15:56 ` [PATCHv4 11/30] x86/tdx: Handle in-kernel MMIO Kirill A. Shutemov
2022-02-24 20:11 ` Dave Hansen
2022-02-25 2:23 ` David Laight
2022-02-25 3:10 ` David Laight
2022-03-02 13:42 ` Kirill A. Shutemov
2022-02-24 15:56 ` [PATCHv4 12/30] x86/tdx: Detect TDX at early kernel decompression time Kirill A. Shutemov
2022-02-24 20:44 ` Dave Hansen
2022-02-24 15:56 ` [PATCHv4 13/30] x86: Adjust types used in port I/O helpers Kirill A. Shutemov
2022-02-24 21:24 ` Dave Hansen
2022-02-24 15:56 ` [PATCHv4 14/30] x86: Consolidate " Kirill A. Shutemov
2022-02-24 15:56 ` [PATCHv4 15/30] x86/boot: Allow to hook up alternative " Kirill A. Shutemov
2022-02-24 22:14 ` Dave Hansen
2022-02-27 22:02 ` Josh Poimboeuf
2022-02-28 16:33 ` Kirill A. Shutemov
2022-02-28 16:44 ` Josh Poimboeuf
2022-02-24 15:56 ` [PATCHv4 16/30] x86/boot/compressed: Support TDX guest port I/O at decompression time Kirill A. Shutemov
2022-02-24 22:22 ` Dave Hansen
2022-02-24 15:56 ` [PATCHv4 17/30] x86/tdx: Add port I/O emulation Kirill A. Shutemov
2022-02-24 22:43 ` Dave Hansen
2022-02-25 3:59 ` Dave Hansen
2022-02-28 1:16 ` Kirill A. Shutemov
2022-02-28 4:32 ` Dave Hansen
2022-02-24 15:56 ` [PATCHv4 18/30] x86/tdx: Handle early boot port I/O Kirill A. Shutemov
2022-02-24 22:58 ` Dave Hansen
2022-02-24 15:56 ` [PATCHv4 19/30] x86/tdx: Wire up KVM hypercalls Kirill A. Shutemov
2022-02-24 15:56 ` [PATCHv4 20/30] x86/boot: Add a trampoline for booting APs via firmware handoff Kirill A. Shutemov
2022-02-24 15:56 ` [PATCHv4 21/30] x86/acpi, x86/boot: Add multiprocessor wake-up support Kirill A. Shutemov
2022-02-24 15:56 ` [PATCHv4 22/30] x86/boot: Set CR0.NE early and keep it set during the boot Kirill A. Shutemov
2022-02-24 15:56 ` [PATCHv4 23/30] x86/boot: Avoid #VE during boot for TDX platforms Kirill A. Shutemov
2022-02-24 15:56 ` [PATCHv4 24/30] x86/topology: Disable CPU online/offline control for TDX guests Kirill A. Shutemov
2022-02-24 15:56 ` [PATCHv4 25/30] x86/tdx: Make pages shared in ioremap() Kirill A. Shutemov
2022-02-24 15:56 ` [PATCHv4 26/30] x86/mm/cpa: Add support for TDX shared memory Kirill A. Shutemov
2022-02-24 15:56 ` [PATCHv4 27/30] x86/kvm: Use bounce buffers for TD guest Kirill A. Shutemov
2022-02-24 15:56 ` [PATCHv4 28/30] x86/tdx: ioapic: Add shared bit for IOAPIC base address Kirill A. Shutemov
2022-02-24 15:56 ` [PATCHv4 29/30] ACPICA: Avoid cache flush on TDX guest Kirill A. Shutemov
2022-02-27 22:05 ` Josh Poimboeuf
2022-02-28 1:34 ` Dan Williams
2022-02-28 16:37 ` Kirill A. Shutemov
2022-02-28 16:46 ` Dave Hansen [this message]
2022-02-28 17:02 ` Josh Poimboeuf
2022-02-24 15:56 ` [PATCHv4 30/30] Documentation/x86: Document TDX kernel architecture Kirill A. Shutemov
2022-02-25 17:42 ` Dave Hansen
2022-02-25 17:54 ` Dave Hansen
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