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From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Juergen Gross <jgross@suse.com>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Andy Lutomirski <luto@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH v5 13/16] x86: decouple PAT and MTRR handling
Date: Mon, 5 Dec 2022 15:21:24 +0300	[thread overview]
Message-ID: <20221205122124.3sixqn52i4xsdxbt@box.shutemov.name> (raw)
In-Reply-To: <cf7db285-deaf-8e3e-2b35-7cecbaff7d61@suse.com>

On Mon, Dec 05, 2022 at 08:40:06AM +0100, Juergen Gross wrote:
> > That's a question for the Intel architects, I guess.
> > 
> > I'd just ask them how to setup PAT in TDX guests. Either they need to
> > change the recommended setup sequence, or the PAT support bit needs to
> > be cleared IMO.
> 
> I've forwarded the question to Intel, BTW.

I've initiated the talk internally too.

> Another question to you: where does the initial PAT MSR value come from?
> I guess from UEFI?

It is set by TDX module on initialization. See section 21.2.4.1.2. "TD
VMCS Guest MSRs" of TDX module spec[1]

[1] https://cdrdv2.intel.com/v1/dl/getContent/733568

-- 
  Kiryl Shutsemau / Kirill A. Shutemov

  reply	other threads:[~2022-12-05 12:21 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-02  7:46 [PATCH v5 00/16] x86: make PAT and MTRR independent from each other Juergen Gross
2022-11-02  7:46 ` [PATCH v5 01/16] x86/mtrr: add comment for set_mtrr_state() serialization Juergen Gross
2022-11-02  7:46 ` [PATCH v5 02/16] x86/mtrr: remove unused cyrix_set_all() function Juergen Gross
2022-11-02  7:47 ` [PATCH v5 03/16] x86/mtrr: replace use_intel() with a local flag Juergen Gross
2022-11-10 12:21   ` [tip: x86/cpu] x86/mtrr: Replace " tip-bot2 for Juergen Gross
2022-11-02  7:47 ` [PATCH v5 04/16] x86/mtrr: rename prepare_set() and post_set() Juergen Gross
2022-11-10 12:21   ` [tip: x86/cpu] x86/mtrr: Rename " tip-bot2 for Juergen Gross
2022-11-02  7:47 ` [PATCH v5 05/16] x86/mtrr: split MTRR specific handling from cache dis/enabling Juergen Gross
2022-11-10 12:21   ` [tip: x86/cpu] x86/mtrr: Split MTRR-specific " tip-bot2 for Juergen Gross
2022-11-02  7:47 ` [PATCH v5 06/16] x86: move some code out of arch/x86/kernel/cpu/mtrr Juergen Gross
2022-11-10 12:21   ` [tip: x86/cpu] x86/mtrr: Move cache control code to cacheinfo.c tip-bot2 for Juergen Gross
2022-11-02  7:47 ` [PATCH v5 07/16] x86/mtrr: Disentangle MTRR init from PAT init Juergen Gross
2022-11-10 12:21   ` [tip: x86/cpu] " tip-bot2 for Juergen Gross
2022-11-02  7:47 ` [PATCH v5 08/16] x86/mtrr: remove set_all callback from struct mtrr_ops Juergen Gross
2022-11-10 12:21   ` [tip: x86/cpu] x86/mtrr: Remove " tip-bot2 for Juergen Gross
2022-11-02  7:47 ` [PATCH v5 09/16] x86/mtrr: simplify mtrr_bp_init() Juergen Gross
2022-11-10 12:21   ` [tip: x86/cpu] x86/mtrr: Simplify mtrr_bp_init() tip-bot2 for Juergen Gross
2022-11-02  7:47 ` [PATCH v5 10/16] x86/mtrr: get rid of __mtrr_enabled bool Juergen Gross
2022-11-10 12:21   ` [tip: x86/cpu] x86/mtrr: Get " tip-bot2 for Juergen Gross
2022-11-02  7:47 ` [PATCH v5 11/16] x86/mtrr: let cache_aps_delayed_init replace mtrr_aps_delayed_init Juergen Gross
2022-11-10 12:21   ` [tip: x86/cpu] x86/mtrr: Let " tip-bot2 for Juergen Gross
2022-11-02  7:47 ` [PATCH v5 12/16] x86/mtrr: add a stop_machine() handler calling only cache_cpu_init() Juergen Gross
2022-11-10 12:21   ` [tip: x86/cpu] x86/mtrr: Add " tip-bot2 for Juergen Gross
2022-11-02  7:47 ` [PATCH v5 13/16] x86: decouple PAT and MTRR handling Juergen Gross
2022-11-10 12:21   ` [tip: x86/cpu] x86: Decouple " tip-bot2 for Juergen Gross
2022-12-01 16:26   ` [PATCH v5 13/16] x86: decouple " Kirill A. Shutemov
2022-12-01 16:33     ` Juergen Gross
2022-12-01 23:57       ` Kirill A. Shutemov
2022-12-02  5:56         ` Juergen Gross
2022-12-02 13:27           ` Kirill A. Shutemov
2022-12-02 13:39             ` Juergen Gross
2022-12-02 14:33               ` Kirill A. Shutemov
2022-12-02 14:56                 ` Juergen Gross
2022-12-05  7:40                   ` Juergen Gross
2022-12-05 12:21                     ` Kirill A. Shutemov [this message]
2022-12-02 13:55           ` Borislav Petkov
2022-11-02  7:47 ` [PATCH v5 14/16] x86: switch cache_ap_init() to hotplug callback Juergen Gross
2022-11-10 12:21   ` [tip: x86/cpu] x86/cacheinfo: Switch " tip-bot2 for Juergen Gross
2022-11-02  7:47 ` [PATCH v5 15/16] x86: do MTRR/PAT setup on all secondary CPUs in parallel Juergen Gross
2022-11-02  7:47 ` [PATCH v5 16/16] x86/mtrr: simplify mtrr_ops initialization Juergen Gross
2022-11-10 12:21   ` [tip: x86/cpu] x86/mtrr: Simplify " tip-bot2 for Juergen Gross
2022-11-02 18:04 ` [PATCH v5 00/16] x86: make PAT and MTRR independent from each other Borislav Petkov
2022-11-03  8:40   ` Juergen Gross
2022-11-03 16:15     ` Borislav Petkov
2022-11-07 19:25       ` Borislav Petkov
2022-11-08  7:30         ` Juergen Gross

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