From: Borislav Petkov <bp@alien8.de>
To: Takahiro Itazuri <itazur@amazon.com>
Cc: dave.hansen@linux.intel.com, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, mingo@redhat.com,
pbonzini@redhat.com, seanjc@google.com, tglx@linutronix.de,
x86@kernel.org, zulinx86@gmail.com
Subject: Re: [PATCH 0/2] KVM: x86: Propagate AMD-specific IBRS bits to guests
Date: Tue, 28 Feb 2023 21:45:56 +0100 [thread overview]
Message-ID: <Y/5oBKi6vjZe83ac@zn.tnic> (raw)
In-Reply-To: <20230228194153.46995-1-itazur@amazon.com>
On Tue, Feb 28, 2023 at 07:41:53PM +0000, Takahiro Itazuri wrote:
> It is true that the kernel does not use those bits at all, but any
> codes could be run inside guests.
So you mean we should stick *all* CPUID leafs in there just because
anything can run in guests?
What is the hypervisor then for?
> One of examples is the following spectre/meltdown checker scipt used as
> de facto standard.
Really? Says who?
$ grep -r . /sys/devices/system/cpu/vulnerabilities/
gives you all you need to know.
And if something's missing, then I'm listening.
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2023-02-28 20:46 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-27 21:05 [PATCH 0/2] KVM: x86: Propagate AMD-specific IBRS bits to guests Takahiro Itazuri
2023-02-27 21:05 ` [PATCH 1/2] x86/cpufeatures: Add AMD-specific IBRS bits Takahiro Itazuri
2023-02-27 21:05 ` [PATCH 2/2] KVM: x86: Propagate AMD-specific IBRS related bits Takahiro Itazuri
2023-02-27 21:40 ` [PATCH 0/2] KVM: x86: Propagate AMD-specific IBRS bits to guests Borislav Petkov
2023-02-28 18:13 ` Takahiro Itazuri
2023-02-28 19:24 ` Borislav Petkov
2023-02-28 19:41 ` Takahiro Itazuri
2023-02-28 20:45 ` Borislav Petkov [this message]
2023-02-28 22:24 ` Takahiro Itazuri
2023-02-28 22:50 ` Borislav Petkov
2023-03-06 21:16 ` Sean Christopherson
2023-03-06 21:25 ` Paolo Bonzini
2023-03-06 21:44 ` Borislav Petkov
2023-03-06 21:47 ` Paolo Bonzini
2023-03-06 21:54 ` Borislav Petkov
2023-03-07 18:49 ` Sean Christopherson
2023-03-07 18:58 ` Borislav Petkov
2023-03-07 19:28 ` Sean Christopherson
2023-03-07 19:55 ` Borislav Petkov
2023-03-06 21:31 ` Paolo Bonzini
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