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From: Borislav Petkov <bp@alien8.de>
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>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	"H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH v4 03/12] x86/mtrr: support setting MTRR state for software defined MTRRs
Date: Tue, 21 Mar 2023 11:30:58 +0100	[thread overview]
Message-ID: <20230321103058.GAZBmHYmhs4s7J+giU@fat_crate.local> (raw)
In-Reply-To: <01ec6ce2-7639-2e4f-3433-c77c29fa7984@suse.com>

On Tue, Mar 21, 2023 at 07:00:58AM +0100, Juergen Gross wrote:
> I guess you are asking because the next test seems to catch the same case?
> 
> I think it doesn't, e.g. for the case of unknown hypervisors (which shows that
> X86_HYPER_NATIVE in theory should be named X86_HYPER_NATIVE_OR_UNKNOWN, or it
> should be split into X86_HYPER_NATIVE and X86_HYPER_UNKNOWN).

Yeah, we don't care about unknown hypervisors. They'll crash'n'burn
anyway.

My intent is to have every case properly documented with a comment above it
instead of one huge compound conditional.

> It basically doesn't matter.

It doesn't matter now. Until someone decides to "redefine" how MTRRs
should be done again because the next representative from the virt zoo
decided to do magic pink ponies.

I'm not taking any chances anymore judging by the amount of crap that
gets sent into arch/x86/ to support some weird guest contraption.

> The only possibility of mtrr_state.enabled to be set at this point is a
> previous call of mtrr_overwrite_state().

Sure, pls make it explicit and defensive so that it is perfectly clear
what's going on.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

  reply	other threads:[~2023-03-21 10:32 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-03-06 16:34 [PATCH v4 00/12] x86/mtrr: fix handling with PAT but without MTRR Juergen Gross
2023-03-06 16:34 ` [PATCH v4 01/12] x86/mtrr: split off physical address size calculation Juergen Gross
2023-03-06 16:34 ` [PATCH v4 02/12] x86/mtrr: optimize mtrr_calc_physbits() Juergen Gross
2023-03-20 12:50   ` Borislav Petkov
2023-03-06 16:34 ` [PATCH v4 03/12] x86/mtrr: support setting MTRR state for software defined MTRRs Juergen Gross
2023-03-20 12:59   ` Huang, Kai
2023-03-20 13:47     ` Juergen Gross
2023-03-20 21:34       ` Huang, Kai
2023-03-20 22:42       ` Borislav Petkov
2023-03-21  6:01         ` Juergen Gross
2023-03-20 19:05   ` Borislav Petkov
2023-03-21  6:00     ` Juergen Gross
2023-03-21 10:30       ` Borislav Petkov [this message]
2023-03-21 15:49         ` Juergen Gross
2023-03-06 16:34 ` [PATCH v4 04/12] x86/hyperv: set MTRR state when running as SEV-SNP Hyper-V guest Juergen Gross
2023-03-06 16:34 ` [PATCH v4 05/12] x86/xen: set MTRR state when running as Xen PV initial domain Juergen Gross
2023-03-07 21:47   ` Boris Ostrovsky
2023-03-23 12:43   ` Borislav Petkov
2023-03-06 16:34 ` [PATCH v4 06/12] x86/mtrr: replace vendor tests in MTRR code Juergen Gross
2023-03-24 16:56   ` Borislav Petkov
2023-03-27  5:43     ` Juergen Gross
2023-03-27  7:14       ` Borislav Petkov
2023-03-06 16:34 ` [PATCH v4 07/12] x86/mtrr: allocate mtrr_value array dynamically Juergen Gross
2023-03-20 12:25   ` Huang, Kai
2023-03-20 13:49     ` Juergen Gross
2023-03-20 15:31       ` Dave Hansen
2023-03-20 15:49         ` Juergen Gross
2023-03-26 22:05   ` Borislav Petkov
2023-03-27  5:44     ` Juergen Gross
2023-03-06 16:34 ` [PATCH v4 08/12] x86/mtrr: add get_effective_type() service function Juergen Gross
2023-03-06 16:34 ` [PATCH v4 09/12] x86/mtrr: construct a memory map with cache modes Juergen Gross
2023-03-29 12:51   ` Borislav Petkov
2023-03-29 13:39     ` Juergen Gross
2023-03-31 12:55       ` Borislav Petkov
2023-03-31 13:23         ` Juergen Gross
2023-04-01 14:24           ` Borislav Petkov
2023-04-03  6:57             ` Juergen Gross
2023-03-31 12:57   ` Borislav Petkov
2023-03-31 13:35     ` Juergen Gross
2023-04-01 14:26       ` Borislav Petkov
2023-04-03  7:02         ` Juergen Gross
2023-03-06 16:34 ` [PATCH v4 10/12] x86/mtrr: use new cache_map in mtrr_type_lookup() Juergen Gross
2023-03-06 16:34 ` [PATCH v4 11/12] x86/mtrr: don't let mtrr_type_lookup() return MTRR_TYPE_INVALID Juergen Gross
2023-03-06 16:34 ` [PATCH v4 12/12] x86/mm: only check uniform after calling mtrr_type_lookup() Juergen Gross
2023-03-07 21:09 ` [PATCH v4 00/12] x86/mtrr: fix handling with PAT but without MTRR Michael Kelley (LINUX)

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