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From: Dan Williams <dan.j.williams@intel.com>
To: Kuppuswamy Sathyanarayanan  <sathyanarayanan.kuppuswamy@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Andy Lutomirski <luto@kernel.org>,
	Dave Hansen <dave.hansen@intel.com>,
	Tony Luck <tony.luck@intel.com>, Andi Kleen <ak@linux.intel.com>,
	Kirill Shutemov <kirill.shutemov@linux.intel.com>,
	Kuppuswamy Sathyanarayanan <knsathya@kernel.org>,
	Raj Ashok <ashok.raj@intel.com>,
	Sean Christopherson <seanjc@google.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [RFC v2 16/32] x86/tdx: Handle MWAIT, MONITOR and WBINVD
Date: Mon, 10 May 2021 18:23:41 -0700	[thread overview]
Message-ID: <CAPcyv4jGmhkrd+Zr4RNcZ5qfXkYO-416Bw2_idVbrgij41yvYg@mail.gmail.com> (raw)
In-Reply-To: <d6ca05720290060e909c1f4d12858f900f1be0e7.1619458733.git.sathyanarayanan.kuppuswamy@linux.intel.com>

On Mon, Apr 26, 2021 at 11:02 AM Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@linux.intel.com> wrote:
>
> When running as a TDX guest, there are a number of existing,
> privileged instructions that do not work. If the guest kernel
> uses these instructions, the hardware generates a #VE.
>
> You can find the list of unsupported instructions in Intel
> Trust Domain Extensions (Intel® TDX) Module specification,
> sec 9.2.2 and in Guest-Host Communication Interface (GHCI)
> Specification for Intel TDX, sec 2.4.1.
>

Ah, better than the "handle port io" patch, these details at least
give the reader a chance.

> To prevent TD guest from using MWAIT/MONITOR instructions,
> support for these instructions are already disabled by TDX
> module (SEAM). So CPUID flags for these instructions should
> be in disabled state.

Why does this not result in a #UD if the instruction is disabled by
SEAM? How is it possible to execute a disabled instruction (one
precluded by CPUID) to the point where it triggers #VE instead of #UD?

> After the above mentioned preventive measures, if TD guests still
> execute these instructions, add appropriate warning messages in #VE
> handler. For WBIND instruction, since it's related to memory writeback
> and cache flushes, it's mainly used in context of IO devices. Since
> TDX 1.0 does not support non-virtual I/O devices, skipping it should
> not cause any fatal issues.

WBINVD is in a different class than MWAIT/MONITOR since it is not
identified by CPUID, it can't possibly have the same #UD behaviour.
It's not clear why WBINVD is included in the same patch as
MWAIT/MONITOR?

I disagree with the assertion that WBINVD is mainly used in the
context of I/O devices, it's also used for ACPI power management
paths. WBINVD dependent functionality should be dynamically disabled
rather than warned about.

Does a TDX guest support out-of-tree modules?  The kernel is already
tainted when out-of-tree modules are loaded. In other words in-tree
modules preclude forbidden instructions because they can just be
audited, and out-of-tree modules are ok to trigger abrupt failure if
they attempt to use forbidden instructions.

> But to let users know about its usage, use
> WARN() to report about it.. For MWAIT/MONITOR instruction, since its
> unsupported use WARN() to report unsupported usage.

I'm not sure how useful warning is outside of a kernel developer's
debug environment. The kernel should know what instructions are
disabled and which are available. WBINVD in particular has potential
data integrity implications. Code that might lead to a WBINVD usage
should be disabled, not run all the way up to where WBINVD is
attempted and then trigger an after-the-fact WARN_ONCE().

The WBINVD change deserves to be split off from MWAIT/MONITOR, and
more thought needs to be put into where these spurious instruction
usages are arising.

>
> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
> Reviewed-by: Andi Kleen <ak@linux.intel.com>
> ---
>  arch/x86/kernel/tdx.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
>
> diff --git a/arch/x86/kernel/tdx.c b/arch/x86/kernel/tdx.c
> index 3fe617978fc4..294dda5bf3f6 100644
> --- a/arch/x86/kernel/tdx.c
> +++ b/arch/x86/kernel/tdx.c
> @@ -371,6 +371,21 @@ int tdg_handle_virtualization_exception(struct pt_regs *regs,
>         case EXIT_REASON_EPT_VIOLATION:
>                 ve->instr_len = tdg_handle_mmio(regs, ve);
>                 break;
> +       case EXIT_REASON_WBINVD:
> +               /*
> +                * WBINVD is not supported inside TDX guests. All in-
> +                * kernel uses should have been disabled.
> +                */
> +               WARN_ONCE(1, "TD Guest used unsupported WBINVD instruction\n");
> +               break;
> +       case EXIT_REASON_MONITOR_INSTRUCTION:
> +       case EXIT_REASON_MWAIT_INSTRUCTION:
> +               /*
> +                * Something in the kernel used MONITOR or MWAIT despite
> +                * X86_FEATURE_MWAIT being cleared for TDX guests.
> +                */
> +               WARN_ONCE(1, "TD Guest used unsupported MWAIT/MONITOR instruction\n");
> +               break;
>         default:
>                 pr_warn("Unexpected #VE: %lld\n", ve->exit_reason);
>                 return -EFAULT;
> --
> 2.25.1
>

  reply	other threads:[~2021-05-11  1:23 UTC|newest]

Thread overview: 381+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-26 18:01 [RFC v2 00/32] Add TDX Guest Support Kuppuswamy Sathyanarayanan
2021-04-26 18:01 ` [RFC v2 01/32] x86/paravirt: Introduce CONFIG_PARAVIRT_XL Kuppuswamy Sathyanarayanan
2021-04-27 17:31   ` Borislav Petkov
2021-05-06 14:59     ` Kirill A. Shutemov
2021-05-10  8:07     ` Juergen Gross
2021-05-10 15:52       ` Andi Kleen
2021-05-10 15:56         ` Juergen Gross
2021-05-12 12:07           ` Kirill A. Shutemov
2021-05-12 13:18           ` Peter Zijlstra
2021-05-12 13:24             ` Andi Kleen
2021-05-12 13:51               ` Juergen Gross
2021-05-17 23:50                 ` [RFC v2-fix 1/1] x86/paravirt: Move halt paravirt calls under CONFIG_PARAVIRT Kuppuswamy Sathyanarayanan
2021-04-26 18:01 ` [RFC v2 02/32] x86/tdx: Introduce INTEL_TDX_GUEST config option Kuppuswamy Sathyanarayanan
2021-04-26 21:09   ` Randy Dunlap
2021-04-26 22:32     ` Kuppuswamy, Sathyanarayanan
2021-04-26 18:01 ` [RFC v2 03/32] x86/cpufeatures: Add TDX Guest CPU feature Kuppuswamy Sathyanarayanan
2021-04-26 18:01 ` [RFC v2 04/32] x86/x86: Add is_tdx_guest() interface Kuppuswamy Sathyanarayanan
2021-04-26 18:01 ` [RFC v2 05/32] x86/tdx: Add __tdcall() and __tdvmcall() helper functions Kuppuswamy Sathyanarayanan
2021-04-26 20:32   ` Dave Hansen
2021-04-26 22:31     ` Kuppuswamy, Sathyanarayanan
2021-04-26 23:17       ` Dave Hansen
2021-04-27  2:29         ` Kuppuswamy, Sathyanarayanan
2021-04-27 14:29           ` Dave Hansen
2021-04-27 19:18             ` Kuppuswamy, Sathyanarayanan
2021-04-27 19:20               ` Dave Hansen
2021-04-28 17:42                 ` [PATCH v1 1/1] x86/tdx: Add __tdx_module_call() and __tdx_hypercall() " Kuppuswamy Sathyanarayanan
2021-05-19  5:58                 ` [RFC v2-fix-v1 " Kuppuswamy Sathyanarayanan
2021-05-19  6:04                   ` Kuppuswamy, Sathyanarayanan
2021-05-19 15:31                   ` Dave Hansen
2021-05-19 19:09                     ` [RFC v2-fix-v2 " Kuppuswamy Sathyanarayanan
2021-05-19 19:13                     ` [RFC v2-fix-v1 " Kuppuswamy, Sathyanarayanan
2021-05-19 20:09                       ` Sean Christopherson
2021-05-19 20:49                         ` Andi Kleen
2021-05-27  0:30                           ` [RFC v2-fix-v2 " Kuppuswamy Sathyanarayanan
2021-05-27 15:25                             ` Luck, Tony
2021-05-27 15:52                               ` Kuppuswamy, Sathyanarayanan
2021-05-27 16:25                                 ` Luck, Tony
2021-04-26 18:01 ` [RFC v2 06/32] x86/tdx: Get TD execution environment information via TDINFO Kuppuswamy Sathyanarayanan
2021-04-26 18:01 ` [RFC v2 07/32] x86/traps: Add do_general_protection() helper function Kuppuswamy Sathyanarayanan
2021-05-07 21:20   ` Dave Hansen
2021-04-26 18:01 ` [RFC v2 08/32] x86/traps: Add #VE support for TDX guest Kuppuswamy Sathyanarayanan
2021-05-07 21:36   ` Dave Hansen
2021-05-13 19:47     ` Andi Kleen
2021-05-13 20:07       ` Dave Hansen
2021-05-13 22:43         ` Andi Kleen
2021-05-13 20:14       ` Dave Hansen
2021-05-18  0:09     ` [RFC v2-fix 1/1] " Kuppuswamy Sathyanarayanan
2021-05-18 15:11       ` Dave Hansen
2021-05-18 15:45         ` Andi Kleen
2021-05-18 15:56           ` Dave Hansen
2021-05-18 16:00             ` Andi Kleen
2021-05-21 19:22           ` Dan Williams
2021-05-24 14:02             ` Andi Kleen
2021-05-27  0:29               ` [RFC v2-fix-v2 " Kuppuswamy Sathyanarayanan
2021-05-27 15:11                 ` Luck, Tony
2021-05-27 16:24                   ` Sean Christopherson
2021-05-27 16:36                     ` Dave Hansen
2021-05-21 18:45       ` [RFC v2-fix " Kuppuswamy, Sathyanarayanan
2021-05-21 19:15         ` Dave Hansen
2021-05-21 19:57           ` Kuppuswamy, Sathyanarayanan
2021-06-08 17:02   ` [RFC v2 08/32] " Dave Hansen
2021-06-08 17:48     ` Sean Christopherson
2021-06-08 17:53       ` Dave Hansen
2021-06-08 18:12         ` Andi Kleen
2021-06-08 18:15           ` Dave Hansen
2021-06-08 18:17             ` Andy Lutomirski
2021-06-08 18:18             ` Andi Kleen
2021-04-26 18:01 ` [RFC v2 09/32] x86/tdx: Add HLT " Kuppuswamy Sathyanarayanan
2021-04-26 18:01 ` [RFC v2 10/32] x86/tdx: Wire up KVM hypercalls Kuppuswamy Sathyanarayanan
2021-05-07 21:46   ` Dave Hansen
2021-05-08  0:59     ` Kuppuswamy, Sathyanarayanan
2021-05-12 13:00       ` Kirill A. Shutemov
2021-05-12 14:10         ` Kuppuswamy, Sathyanarayanan
2021-05-12 14:29           ` Dave Hansen
2021-05-13 19:29             ` Kuppuswamy, Sathyanarayanan
2021-05-13 19:33               ` Dave Hansen
2021-05-18  0:15                 ` [RFC v2-fix 1/1] " Kuppuswamy Sathyanarayanan
2021-05-18 15:51                   ` Dave Hansen
2021-05-18 16:23                     ` Sean Christopherson
2021-05-18 20:12                     ` Kuppuswamy, Sathyanarayanan
2021-05-18 20:19                       ` Dave Hansen
2021-05-18 20:57                         ` Kuppuswamy, Sathyanarayanan
2021-05-18 21:19                         ` [RFC v2-fix-v2 " Kuppuswamy Sathyanarayanan
2021-05-18 23:29                           ` Dave Hansen
2021-05-19  1:17                             ` [RFC v2-fix-v3 " Kuppuswamy Sathyanarayanan
2021-05-19  1:20                               ` Sathyanarayanan Kuppuswamy Natarajan
2021-04-26 18:01 ` [RFC v2 11/32] x86/tdx: Add MSR support for TDX guest Kuppuswamy Sathyanarayanan
2021-04-26 18:01 ` [RFC v2 12/32] x86/tdx: Handle CPUID via #VE Kuppuswamy Sathyanarayanan
2021-04-26 18:01 ` [RFC v2 13/32] x86/io: Allow to override inX() and outX() implementation Kuppuswamy Sathyanarayanan
2021-04-26 18:01 ` [RFC v2 14/32] x86/tdx: Handle port I/O Kuppuswamy Sathyanarayanan
2021-05-10 21:57   ` Dan Williams
2021-05-10 23:08     ` Andi Kleen
2021-05-10 23:34       ` Dan Williams
2021-05-11  0:01         ` Andi Kleen
2021-05-11  0:21           ` Dan Williams
2021-05-11  0:30         ` Kuppuswamy, Sathyanarayanan
2021-05-11  1:07           ` Dan Williams
2021-05-11  2:29             ` Kuppuswamy, Sathyanarayanan
2021-05-11 14:39               ` Dave Hansen
2021-05-11 15:08                 ` Kuppuswamy, Sathyanarayanan
2021-05-11  0:56         ` Kuppuswamy, Sathyanarayanan
2021-05-11  2:19           ` Andi Kleen
2021-05-11 15:35     ` Dave Hansen
2021-05-11 15:43       ` Dan Williams
2021-05-12  6:17       ` Dan Williams
2021-05-27  4:23         ` [RFC v2-fix-v1 0/3] " Kuppuswamy Sathyanarayanan
2021-05-27  4:23           ` [RFC v2-fix-v1 1/3] tdx: Introduce generic protected_guest abstraction Kuppuswamy Sathyanarayanan
2021-06-01 21:14             ` [RFC v2-fix-v2 1/1] x86: Introduce generic protected guest abstraction Kuppuswamy Sathyanarayanan
2021-06-02 17:20               ` Sean Christopherson
2021-06-02 18:15                 ` Tom Lendacky
2021-06-02 18:25                   ` Kuppuswamy, Sathyanarayanan
2021-06-02 18:29                   ` Borislav Petkov
2021-06-02 18:32                     ` Kuppuswamy, Sathyanarayanan
2021-06-02 18:39                       ` Borislav Petkov
2021-06-02 18:45                         ` Kuppuswamy, Sathyanarayanan
2021-06-02 18:19               ` Tom Lendacky
2021-06-02 18:29                 ` Kuppuswamy, Sathyanarayanan
2021-06-02 18:30                 ` Borislav Petkov
2021-06-03 18:14               ` Borislav Petkov
2021-06-03 18:15                 ` [RFC v2-fix-v2 1/1] x86: Introduce generic protected guest abstractionn Borislav Petkov
2021-06-04 22:01                   ` Tom Lendacky
2021-06-04 22:13                     ` Kuppuswamy, Sathyanarayanan
2021-06-04 22:15                     ` Borislav Petkov
2021-06-04 23:31                       ` Tom Lendacky
2021-06-05 11:03                         ` Borislav Petkov
2021-06-05 18:12                           ` Kuppuswamy, Sathyanarayanan
2021-06-05 20:08                             ` Borislav Petkov
2021-06-07 19:55                   ` Kirill A. Shutemov
2021-06-07 20:14                     ` Borislav Petkov
2021-06-07 22:26                       ` Kuppuswamy, Sathyanarayanan
2021-06-08 21:30                         ` [RFC v2-fix-v3 1/1] x86: Introduce generic protected guest abstraction Kuppuswamy Sathyanarayanan
2021-06-03 18:33                 ` [RFC v2-fix-v2 " Kuppuswamy, Sathyanarayanan
2021-06-03 18:41                   ` Borislav Petkov
2021-06-03 18:54                     ` Kuppuswamy, Sathyanarayanan
2021-06-07 18:01                 ` Kuppuswamy, Sathyanarayanan
2021-06-07 18:26                   ` Borislav Petkov
2021-06-09 14:01                     ` Kuppuswamy, Sathyanarayanan
2021-06-09 14:32                       ` Borislav Petkov
2021-06-09 14:56                         ` Kuppuswamy, Sathyanarayanan
2021-06-09 15:01                           ` Borislav Petkov
2021-06-09 19:41                             ` [RFC v2-fix-v4 " Kuppuswamy Sathyanarayanan
2021-06-09 22:53                               ` Sathyanarayanan Kuppuswamy Natarajan
2021-05-27  4:23           ` [RFC v2-fix-v1 2/3] x86/tdx: Handle early IO operations Kuppuswamy Sathyanarayanan
2021-06-05  4:26             ` Williams, Dan J
2021-05-27  4:23           ` [RFC v2-fix-v1 3/3] x86/tdx: Handle port I/O Kuppuswamy Sathyanarayanan
2021-06-05 18:52             ` Dan Williams
2021-06-05 20:08               ` Kuppuswamy, Sathyanarayanan
2021-06-05 21:08                 ` Dan Williams
2021-06-07 16:24                   ` Kuppuswamy, Sathyanarayanan
2021-06-07 17:17                     ` Dan Williams
2021-06-07 21:52                       ` Kuppuswamy, Sathyanarayanan
2021-06-07 22:00                         ` Dan Williams
2021-06-08  2:57                           ` Andi Kleen
2021-06-08 15:40                       ` [RFC v2-fix-v2 0/3] " Kuppuswamy Sathyanarayanan
2021-06-08 15:40                         ` [RFC v2-fix-v2 1/3] x86/tdx: Handle port I/O in decompression code Kuppuswamy Sathyanarayanan
2021-06-08 23:12                           ` Dan Williams
2021-06-08 15:40                         ` [RFC v2-fix-v2 2/3] x86/tdx: Handle early IO operations Kuppuswamy Sathyanarayanan
2021-06-08 15:40                         ` [RFC v2-fix-v2 3/3] x86/tdx: Handle port I/O Kuppuswamy Sathyanarayanan
2021-06-08 16:26                           ` Dan Williams
2021-04-26 18:01 ` [RFC v2 15/32] x86/tdx: Handle in-kernel MMIO Kuppuswamy Sathyanarayanan
2021-05-07 21:52   ` Dave Hansen
2021-05-18  0:48     ` [RFC v2-fix 1/1] " Kuppuswamy Sathyanarayanan
2021-05-18 15:00       ` Dave Hansen
2021-05-18 15:56         ` Andi Kleen
2021-05-18 16:04           ` Dave Hansen
2021-05-18 16:10             ` Andi Kleen
2021-05-18 16:22               ` Dave Hansen
2021-05-18 17:05                 ` Andi Kleen
2021-05-18 17:28               ` Andi Kleen
2021-05-18 17:11           ` Sean Christopherson
2021-05-18 17:21             ` Andi Kleen
2021-05-18 17:46               ` Dave Hansen
2021-05-18 18:36                 ` Sean Christopherson
2021-05-18 20:20                 ` Andi Kleen
2021-05-18 20:40                   ` Dave Hansen
2021-05-18 21:05                     ` Andi Kleen
2021-05-18 18:22               ` Sean Christopherson
2021-05-18 20:28                 ` Andi Kleen
2021-05-18 20:37                   ` Sean Christopherson
2021-05-18 20:56                     ` Andi Kleen
2021-05-18 16:18         ` Sean Christopherson
2021-05-18 17:15           ` Andi Kleen
2021-05-18 18:17             ` Sean Christopherson
2021-05-20 22:47               ` Kirill A. Shutemov
2021-06-02 19:42     ` [RFC v2-fix-v2 0/2] " Kuppuswamy Sathyanarayanan
2021-06-02 19:42       ` [RFC v2-fix-v2 1/2] x86/sev-es: Abstract out MMIO instruction decoding Kuppuswamy Sathyanarayanan
2021-06-05 21:56         ` Dan Williams
2021-06-08 15:59           ` [RFC v2-fix-v3 0/4] x86/tdx: Handle in-kernel MMIO Kuppuswamy Sathyanarayanan
2021-06-08 15:59             ` [RFC v2-fix-v3 1/4] x86/insn-eval: Introduce insn_get_modrm_reg_ptr() Kuppuswamy Sathyanarayanan
2021-06-08 15:59             ` [RFC v2-fix-v3 2/4] x86/insn-eval: Introduce insn_decode_mmio() Kuppuswamy Sathyanarayanan
2021-06-08 15:59             ` [RFC v2-fix-v3 3/4] x86/sev-es: Use insn_decode_mmio() for MMIO implementation Kuppuswamy Sathyanarayanan
2021-06-08 15:59             ` [RFC v2-fix-v3 4/4] x86/tdx: Handle in-kernel MMIO Kuppuswamy Sathyanarayanan
2021-06-02 19:42       ` [RFC v2-fix-v2 2/2] " Kuppuswamy Sathyanarayanan
2021-06-02 21:01         ` Andi Kleen
2021-06-02 22:14           ` Kuppuswamy, Sathyanarayanan
2021-04-26 18:01 ` [RFC v2 16/32] x86/tdx: Handle MWAIT, MONITOR and WBINVD Kuppuswamy Sathyanarayanan
2021-05-11  1:23   ` Dan Williams [this message]
2021-05-11  2:17     ` Andi Kleen
2021-05-11  2:44       ` Kuppuswamy, Sathyanarayanan
2021-05-11  2:51         ` Andi Kleen
2021-05-11 15:37       ` Dan Williams
2021-05-11 15:42         ` Andi Kleen
2021-05-11 15:44         ` Dave Hansen
2021-05-11 15:50           ` Dan Williams
2021-05-11 15:52             ` Andi Kleen
2021-05-11 16:04               ` Dave Hansen
2021-05-11 17:06                 ` Andi Kleen
2021-05-11 17:42                   ` Dave Hansen
2021-05-11 17:48                     ` Andi Kleen
2021-05-24 23:32                       ` [RFC v2-fix-v2 1/2] x86/tdx: Handle MWAIT and MONITOR Kuppuswamy Sathyanarayanan
2021-05-24 23:32                         ` [RFC v2-fix-v2 2/2] x86/tdx: Ignore WBINVD instruction for TDX guest Kuppuswamy Sathyanarayanan
2021-05-24 23:39                           ` Dan Williams
2021-05-25  0:29                             ` Kuppuswamy, Sathyanarayanan
2021-05-25  0:50                               ` Dan Williams
2021-05-25  0:54                                 ` Sean Christopherson
2021-05-25  1:02                                 ` Andi Kleen
2021-05-25  1:45                                   ` Dan Williams
2021-05-25  2:13                                     ` Andi Kleen
2021-05-25  2:49                                       ` Dan Williams
2021-05-25  3:27                                         ` Andi Kleen
2021-05-25  3:40                                           ` Dan Williams
2021-05-26  1:09                                             ` Andi Kleen
2021-05-27  4:38                                               ` [RFC v2-fix-v3 1/1] " Kuppuswamy Sathyanarayanan
2021-06-05  3:35                                                 ` Dan Williams
2021-06-08 21:35                                                   ` [RFC v2-fix-v3 1/1] x86/tdx: Skip " Kuppuswamy Sathyanarayanan
2021-06-08 21:41                                                     ` Dan Williams
2021-06-08 22:17                                                     ` Dave Hansen
2021-06-08 22:34                                                       ` Andi Kleen
2021-06-08 22:36                                                       ` Kuppuswamy, Sathyanarayanan
2021-06-08 22:53                                                         ` Dave Hansen
2021-06-08 23:04                                                           ` Andi Kleen
2021-06-08 23:04                                                           ` Kuppuswamy, Sathyanarayanan
2021-06-08 23:32                                                     ` Dan Williams
2021-06-08 23:38                                                       ` Dave Hansen
2021-06-09  0:07                                                         ` Dan Williams
2021-06-09  0:14                                                           ` Kuppuswamy, Sathyanarayanan
2021-06-09  1:10                                                           ` [RFC v2-fix-v4 " Kuppuswamy Sathyanarayanan
2021-06-09  3:40                                                             ` Dan Williams
2021-06-09  3:56                                                               ` Kuppuswamy, Sathyanarayanan
2021-06-09  4:19                                                                 ` Dan Williams
2021-06-09  4:27                                                                   ` Andi Kleen
2021-06-09 15:09                                                                     ` Dan Williams
2021-06-09 16:12                                                                       ` Andy Lutomirski
2021-06-09 17:28                                                                         ` Kuppuswamy, Sathyanarayanan
2021-06-09 17:31                                                                           ` Dan Williams
2021-06-09 18:24                                                                             ` Kuppuswamy, Sathyanarayanan
2021-06-09 19:49                                                                               ` [RFC v2-fix-v5 1/1] x86: Skip WBINVD instruction for VM guest Kuppuswamy Sathyanarayanan
2021-06-09 19:56                                                                                 ` Dan Williams
2021-06-09 21:03                                                                                 ` Dave Hansen
2021-06-09 21:38                                                                                   ` Dan Williams
2021-06-09 21:42                                                                                     ` Kuppuswamy, Sathyanarayanan
2021-06-09 23:55                                                                                       ` Dave Hansen
2021-06-09  4:02                                                               ` [RFC v2-fix-v4 1/1] x86/tdx: Skip WBINVD instruction for TDX guest Andy Lutomirski
2021-06-09  4:21                                                                 ` Dan Williams
2021-06-09  4:25                                                                 ` Andi Kleen
2021-06-09  4:32                                                                   ` Andy Lutomirski
2021-06-09  4:40                                                                     ` Andi Kleen
2021-06-09  4:54                                                                       ` Kuppuswamy, Sathyanarayanan
2021-06-09 14:12                                                             ` Dave Hansen
2021-05-25  4:32                                       ` [RFC v2-fix-v2 2/2] x86/tdx: Ignore " Dave Hansen
2021-05-25  0:36                             ` Andi Kleen
2021-05-24 23:42                           ` Dave Hansen
2021-05-25  0:39                             ` Andi Kleen
2021-05-25  0:53                               ` Dan Williams
2021-05-25  2:26                         ` [RFC v2-fix-v2 1/2] x86/tdx: Handle MWAIT and MONITOR Dan Williams
2021-05-11 14:08     ` [RFC v2 16/32] x86/tdx: Handle MWAIT, MONITOR and WBINVD Dave Hansen
2021-05-11 16:09       ` Sean Christopherson
2021-05-11 16:16         ` Dave Hansen
2021-05-11 15:53   ` Dave Hansen
2021-04-26 18:01 ` [RFC v2 17/32] ACPICA: ACPI 6.4: MADT: add Multiprocessor Wakeup Structure Kuppuswamy Sathyanarayanan
2021-04-26 18:01 ` [RFC v2 18/32] ACPICA: ACPI 6.4: MADT: add Multiprocessor Wakeup Mailbox Structure Kuppuswamy Sathyanarayanan
2021-04-26 18:01 ` [RFC v2 19/32] ACPI/table: Print MADT Wake table information Kuppuswamy Sathyanarayanan
2021-04-26 18:01 ` [RFC v2 20/32] x86/acpi, x86/boot: Add multiprocessor wake-up support Kuppuswamy Sathyanarayanan
2021-04-26 18:01 ` [RFC v2 21/32] x86/boot: Add a trampoline for APs booting in 64-bit mode Kuppuswamy Sathyanarayanan
2021-05-13  2:56   ` Dan Williams
2021-05-18  0:54     ` [RFC v2-fix 1/1] " Kuppuswamy Sathyanarayanan
2021-05-18  2:06       ` Dan Williams
2021-05-18  2:53         ` Kuppuswamy, Sathyanarayanan
2021-05-18  4:08           ` Dan Williams
2021-05-20  0:18             ` Kuppuswamy, Sathyanarayanan
2021-05-20  0:40               ` Dan Williams
2021-05-20  0:42                 ` Kuppuswamy, Sathyanarayanan
2021-05-21 14:39                   ` [RFC v2-fix-v2 " Kuppuswamy Sathyanarayanan
2021-05-21 18:29                     ` Dan Williams
2021-04-26 18:01 ` [RFC v2 22/32] x86/boot: Avoid #VE during compressed boot for TDX platforms Kuppuswamy Sathyanarayanan
2021-05-13  3:03   ` Dan Williams
2021-04-26 18:01 ` [RFC v2 23/32] x86/boot: Avoid unnecessary #VE during boot process Kuppuswamy Sathyanarayanan
2021-05-13  3:23   ` Dan Williams
2021-05-18  0:59     ` [WARNING: UNSCANNABLE EXTRACTION FAILED][WARNING: UNSCANNABLE EXTRACTION FAILED][RFC v2-fix 1/1] x86/boot: Avoid #VE during boot for TDX platforms Kuppuswamy Sathyanarayanan
2021-05-19 16:53       ` [RFC " Dave Hansen
2021-05-21 14:35         ` [RFC v2-fix-v2 " Kuppuswamy Sathyanarayanan
2021-05-21 16:11           ` Dave Hansen
2021-05-21 18:18             ` Sean Christopherson
2021-05-21 18:30               ` Dave Hansen
2021-05-21 18:32                 ` Kuppuswamy, Sathyanarayanan
2021-05-24 23:27                   ` [RFC v2-fix-v3 " Kuppuswamy Sathyanarayanan
2021-05-27 21:25                     ` [RFC v2-fix-v4 " Kuppuswamy Sathyanarayanan
2021-06-08 23:14                       ` Dan Williams
2021-05-21 18:31             ` [RFC v2-fix-v2 " Kuppuswamy, Sathyanarayanan
2021-04-26 18:01 ` [RFC v2 24/32] x86/topology: Disable CPU online/offline control for TDX guest Kuppuswamy Sathyanarayanan
2021-04-26 18:01 ` [RFC v2 25/32] x86/tdx: Forcefully disable legacy PIC for TDX guests Kuppuswamy Sathyanarayanan
2021-04-26 18:01 ` [RFC v2 26/32] x86/mm: Move force_dma_unencrypted() to common code Kuppuswamy Sathyanarayanan
2021-05-07 21:54   ` Dave Hansen
2021-05-10 22:19     ` Kuppuswamy, Sathyanarayanan
2021-05-10 22:23       ` Dave Hansen
2021-05-12 13:08         ` Kirill A. Shutemov
2021-05-12 15:44           ` Dave Hansen
2021-05-12 15:53             ` Sean Christopherson
2021-05-13 16:40               ` Kuppuswamy, Sathyanarayanan
2021-05-13 17:49                 ` Dave Hansen
2021-05-13 18:17                   ` Kuppuswamy, Sathyanarayanan
2021-05-13 19:38                   ` Andi Kleen
2021-05-13 19:42                     ` Dave Hansen
2021-05-17 18:16                     ` Sean Christopherson
2021-05-17 18:27                       ` Kuppuswamy, Sathyanarayanan
2021-05-17 18:33                         ` Dave Hansen
2021-05-17 18:37                           ` Sean Christopherson
2021-05-17 22:32                             ` Kuppuswamy, Sathyanarayanan
2021-05-17 23:11                               ` Andi Kleen
2021-05-18  1:28             ` Kuppuswamy, Sathyanarayanan
2021-05-27  4:46               ` Kuppuswamy, Sathyanarayanan
2021-05-27  4:47                 ` [RFC v2-fix-v1 1/1] " Kuppuswamy Sathyanarayanan
2021-06-01  2:10                   ` [RFC v2-fix-v2 " Kuppuswamy Sathyanarayanan
2021-04-26 18:01 ` [RFC v2 27/32] x86/tdx: Exclude Shared bit from __PHYSICAL_MASK Kuppuswamy Sathyanarayanan
2021-05-19  5:00   ` Kuppuswamy, Sathyanarayanan
2021-05-19 16:14   ` Dave Hansen
2021-05-20 18:48     ` Kuppuswamy, Sathyanarayanan
2021-05-20 18:56       ` Kuppuswamy, Sathyanarayanan
2021-05-20 19:33       ` Sean Christopherson
2021-05-20 19:42         ` Kuppuswamy, Sathyanarayanan
2021-05-20 20:16           ` Sean Christopherson
2021-05-20 20:31             ` Andi Kleen
2021-05-20 21:18               ` Sean Christopherson
2021-05-20 21:23                 ` Dave Hansen
2021-05-20 21:28                   ` Kuppuswamy, Sathyanarayanan
2021-05-20 23:25                     ` Andi Kleen
2021-05-20 20:56             ` Dave Hansen
2021-05-31 21:46               ` Kirill A. Shutemov
2021-06-01  2:08                 ` [RFC v2-fix-v1 1/1] x86/tdx: Exclude Shared bit from physical_mask Kuppuswamy Sathyanarayanan
2021-05-20 20:30       ` [RFC v2 27/32] x86/tdx: Exclude Shared bit from __PHYSICAL_MASK Dave Hansen
2021-04-26 18:01 ` [RFC v2 28/32] x86/tdx: Make pages shared in ioremap() Kuppuswamy Sathyanarayanan
2021-05-07 21:55   ` Dave Hansen
2021-05-07 22:38     ` Andi Kleen
2021-05-10 22:23       ` Kuppuswamy, Sathyanarayanan
2021-05-10 22:30         ` Dave Hansen
2021-05-10 22:52           ` Sean Christopherson
2021-05-11  9:35             ` Borislav Petkov
2021-05-20 20:12               ` Kuppuswamy, Sathyanarayanan
2021-05-21 15:18                 ` Borislav Petkov
2021-05-21 16:19                   ` Tom Lendacky
2021-05-21 18:49                     ` Borislav Petkov
2021-05-21 21:14                       ` Tom Lendacky
2021-05-25 18:21                         ` Kuppuswamy, Sathyanarayanan
2021-05-31 15:13                           ` Borislav Petkov
2021-05-31 17:32                             ` Kuppuswamy, Sathyanarayanan
2021-05-31 17:55                               ` Borislav Petkov
2021-05-31 18:45                                 ` Kuppuswamy, Sathyanarayanan
2021-05-31 19:14                                   ` Borislav Petkov
2021-06-01  2:07                                     ` [RFC v2-fix-v1 1/1] " Kuppuswamy Sathyanarayanan
2021-06-01 21:16                                     ` [RFC v2 28/32] " Kuppuswamy, Sathyanarayanan
2021-05-26 21:37                     ` Kuppuswamy, Sathyanarayanan
2021-05-26 22:02                       ` Tom Lendacky
2021-05-26 22:14                         ` Tom Lendacky
2021-05-26 22:20                           ` Kuppuswamy, Sathyanarayanan
2021-04-26 18:01 ` [RFC v2 29/32] x86/tdx: Add helper to do MapGPA TDVMALL Kuppuswamy Sathyanarayanan
2021-05-19 15:59   ` Dave Hansen
2021-05-20 23:14     ` Kuppuswamy, Sathyanarayanan
2021-05-27  4:56       ` [RFC v2-fix-v1 1/1] x86/tdx: Add helper to do MapGPA hypercall Kuppuswamy Sathyanarayanan
2021-04-26 18:01 ` [RFC v2 30/32] x86/tdx: Make DMA pages shared Kuppuswamy Sathyanarayanan
2021-05-18  1:19   ` [RFC v2-fix 1/1] " Kuppuswamy Sathyanarayanan
2021-05-18 19:55     ` Sean Christopherson
2021-05-18 22:12       ` Kuppuswamy, Sathyanarayanan
2021-05-18 22:31         ` Dave Hansen
2021-06-01  2:06           ` [RFC v2-fix-v2 " Kuppuswamy Sathyanarayanan
2021-04-26 18:01 ` [RFC v2 31/32] x86/kvm: Use bounce buffers for TD guest Kuppuswamy Sathyanarayanan
2021-06-01  2:03   ` [RFC v2-fix-v1 1/1] " Kuppuswamy Sathyanarayanan
2021-04-26 18:01 ` [RFC v2 32/32] x86/tdx: ioapic: Add shared bit for IOAPIC base address Kuppuswamy Sathyanarayanan
2021-05-07 23:06   ` Dave Hansen
2021-05-24 23:29     ` [RFC v2-fix-v2 1/1] " Kuppuswamy Sathyanarayanan
2021-06-01  1:28       ` [RFC v2-fix-v3 " Kuppuswamy Sathyanarayanan
2021-05-03 23:21 ` [RFC v2 00/32] Add TDX Guest Support Kuppuswamy, Sathyanarayanan

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