From: "Radim Krčmář" <rkrcmar@redhat.com>
To: Ladi Prosek <lprosek@redhat.com>
Cc: kvm@vger.kernel.org, joro@8bytes.org
Subject: Re: [PATCH] KVM: x86: Add MSR_AMD64_DC_CFG to the list of ignored MSRs
Date: Wed, 12 Apr 2017 21:16:40 +0200 [thread overview]
Message-ID: <20170412191639.GF20145@potion> (raw)
In-Reply-To: <20170406132220.17178-1-lprosek@redhat.com>
2017-04-06 15:22+0200, Ladi Prosek:
> Hyper-V writes 0x800000000000 to MSR_AMD64_DC_CFG when running on AMD CPUs
> as recommended in erratum 383, analogous to our svm_init_erratum_383.
>
> By ignoring the MSR, this patch enables running Hyper-V in L1 on AMD.
>
> Signed-off-by: Ladi Prosek <lprosek@redhat.com>
> ---
Dirty, but I don't see a reason to overengineer this ...
Applied to kvm/queue, thanks.
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> @@ -2417,6 +2418,7 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
> case MSR_FAM10H_MMIO_CONF_BASE:
> case MSR_AMD64_BU_CFG2:
> case MSR_IA32_PERF_CTL:
> + case MSR_AMD64_DC_CFG:
This will change L1 KVM's behavior to set erratum_383_found, but L0 will
kill it anyway after hitting the errata in L2.
prev parent reply other threads:[~2017-04-12 19:16 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-06 13:22 [PATCH] KVM: x86: Add MSR_AMD64_DC_CFG to the list of ignored MSRs Ladi Prosek
2017-04-06 14:11 ` David Hildenbrand
2017-04-12 19:16 ` Radim Krčmář [this message]
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