From: Borislav Petkov <bp@alien8.de>
To: Jim Mattson <jmattson@google.com>
Cc: Sean Christopherson <seanjc@google.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H . Peter Anvin" <hpa@zytor.com>,
Paolo Bonzini <pbonzini@redhat.com>,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Subject: Re: [PATCH v2 0/3] KVM: EFER.LMSLE cleanup
Date: Wed, 21 Sep 2022 19:11:42 +0200 [thread overview]
Message-ID: <YytFzvQx0BbSCT7m@zn.tnic> (raw)
In-Reply-To: <CALMp9eQ-qkjBm8qPhOaMzZLWeHJcrwksV+XLQ9DfOQ_i1aykqQ@mail.gmail.com>
On Wed, Sep 21, 2022 at 09:23:40AM -0700, Jim Mattson wrote:
> AMD defined the 64-bit x86 extensions while Intel was distracted with
> their VLIW science fair project. In this space, Intel produces AMD64
> compatible CPUs.
Almost-compatible. And maybe, just maybe, because Intel were probably
and practically forced to implement AMD64 but then thought, oh well,
we'll do some things differently.
> The definitive specification comes from AMD (which is sad, because
> AMD's documentation is abysmal).
Just don't tell me the SDM is better...
But you and I are really talking past each other: there's nothing
definitive about a spec if, while implementing it, the other vendor is
doing some subtle, but very software visible things differently.
I.e., the theory vs reality point I'm trying to get across.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2022-09-21 17:12 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-20 20:59 [PATCH v2 0/3] KVM: EFER.LMSLE cleanup Jim Mattson
2022-09-20 20:59 ` [PATCH v2 1/3] Revert "KVM: SVM: Allow EFER.LMSLE to be set with nested svm" Jim Mattson
2022-09-20 20:59 ` [PATCH v2 2/3] x86/cpufeatures: Introduce X86_FEATURE_NO_LMSLE Jim Mattson
2022-09-21 16:07 ` Borislav Petkov
2022-09-20 20:59 ` [PATCH v2 3/3] KVM: SVM: Unconditionally enumerate EferLmsleUnsupported Jim Mattson
2022-10-07 22:41 ` Sean Christopherson
2022-09-20 21:17 ` [PATCH v2 0/3] KVM: EFER.LMSLE cleanup Borislav Petkov
2022-09-20 21:36 ` Sean Christopherson
2022-09-20 21:36 ` Jim Mattson
2022-09-21 9:28 ` Borislav Petkov
2022-09-21 13:45 ` Jim Mattson
2022-09-21 13:54 ` Borislav Petkov
2022-09-21 15:11 ` Jim Mattson
2022-09-21 16:06 ` Borislav Petkov
2022-09-21 16:23 ` Jim Mattson
2022-09-21 17:11 ` Borislav Petkov [this message]
2022-09-21 17:45 ` Jim Mattson
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