From: Paolo Bonzini <pbonzini@redhat.com>
To: Eduardo Habkost <ehabkost@redhat.com>, Wanpeng Li <kernellwp@gmail.com>
Cc: "Borislav Petkov" <bp@alien8.de>,
LKML <linux-kernel@vger.kernel.org>, kvm <kvm@vger.kernel.org>,
"Radim Krčmář" <rkrcmar@redhat.com>
Subject: Re: [PATCH] KVM: X86: Allow userspace to define the microcode version
Date: Wed, 18 Apr 2018 12:36:37 +0200 [thread overview]
Message-ID: <de059c45-d706-ff70-9063-92ac0a807e26@redhat.com> (raw)
In-Reply-To: <20180418090329.GJ29865@localhost.localdomain>
On 18/04/2018 11:03, Eduardo Habkost wrote:
>>> QEMU setting ucode_rev automatically using the host value when
>>> using "-cpu host" (with no need for explicit ucode_rev option)
>>> makes sense to me.
>> QEMU can't get the host value by rdmsr MSR_IA32_UCODE_REV directly
>> since rdmsr will #GP when ring !=0, any idea?
> By looking at kvm_get_msr_feature(), it looks like
> ioctl(system_fd, KVM_GET_MSRS) would return the host MSR value
> for us.
Yes, that's exactly what it was introduced for (together with other MSRs
including VMX capabilities).
Paolo
next prev parent reply other threads:[~2018-04-18 10:36 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-26 7:23 Wanpeng Li
2018-02-26 9:41 ` Borislav Petkov
2018-02-26 10:06 ` Wanpeng Li
2018-02-26 10:49 ` Borislav Petkov
2018-02-26 11:02 ` Wanpeng Li
2018-02-26 11:16 ` Borislav Petkov
2018-02-26 11:25 ` Wanpeng Li
2018-02-26 11:30 ` Borislav Petkov
2018-02-26 11:37 ` Wanpeng Li
2018-02-26 11:44 ` Borislav Petkov
2018-02-26 11:52 ` Wanpeng Li
2018-02-26 11:54 ` Paolo Bonzini
2018-02-26 12:15 ` Borislav Petkov
2018-02-26 12:16 ` Paolo Bonzini
2018-02-26 12:18 ` Paolo Bonzini
2018-02-26 12:22 ` Borislav Petkov
2018-02-26 12:41 ` Paolo Bonzini
2018-02-26 13:05 ` Borislav Petkov
2018-02-26 14:39 ` Konrad Rzeszutek Wilk
2018-02-26 14:46 ` Paolo Bonzini
2018-02-26 19:37 ` Borislav Petkov
2018-02-26 20:51 ` Konrad Rzeszutek Wilk
2018-02-26 21:30 ` Konrad Rzeszutek Wilk
2018-02-27 8:33 ` Paolo Bonzini
2018-03-08 9:24 ` [tip:x86/pti] x86/spectre_v2: Don't check microcode versions when running under hypervisors tip-bot for Konrad Rzeszutek Wilk
2018-04-17 10:40 ` [PATCH] KVM: X86: Allow userspace to define the microcode version Wanpeng Li
2018-04-17 20:24 ` Eduardo Habkost
2018-04-18 3:24 ` Wanpeng Li
2018-04-18 9:03 ` Eduardo Habkost
2018-04-18 10:36 ` Paolo Bonzini [this message]
2018-04-23 12:58 ` Borislav Petkov
2018-04-23 13:08 ` Eduardo Habkost
2018-04-23 13:23 ` Borislav Petkov
2018-04-23 16:03 ` Paolo Bonzini
2018-04-24 2:59 ` Wanpeng Li
2018-04-24 3:14 ` Konrad Rzeszutek Wilk
2018-04-24 5:09 ` Paolo Bonzini
2018-04-24 13:44 ` Konrad Rzeszutek Wilk
2018-04-24 2:56 ` Wanpeng Li
2018-02-26 11:47 ` Paolo Bonzini
2018-02-26 12:20 ` Borislav Petkov
2018-02-26 9:26 Liran Alon
2018-02-26 10:08 ` Wanpeng Li
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