From: Eduardo Habkost <ehabkost@redhat.com>
To: Luwei Kang <luwei.kang@intel.com>
Cc: pbonzini@redhat.com, qemu-devel@nongnu.org, rth@twiddle.net
Subject: Re: [PATCH v2] target/i386: set the CPUID level to 0x14 on old machine-type
Date: Mon, 23 Mar 2020 14:32:06 -0400 [thread overview]
Message-ID: <20200323183206.GA9322@habkost.net> (raw)
In-Reply-To: <1584031686-16444-1-git-send-email-luwei.kang@intel.com>
On Fri, Mar 13, 2020 at 12:48:06AM +0800, Luwei Kang wrote:
> The CPUID level need to be set to 0x14 manually on old
> machine-type if Intel PT is enabled in guest. E.g. the
> CPUID[0].EAX(level)=7 and CPUID[7].EBX[25](intel-pt)=1 when the
> Qemu with "-machine pc-i440fx-3.1 -cpu qemu64,+intel-pt" parameter.
>
> Some Intel PT capabilities are exposed by leaf 0x14 and the
> missing capabilities will cause some MSRs access failed.
> This patch add a warning message to inform the user to extend
> the CPUID level.
>
> Suggested-by: Eduardo Habkost <ehabkost@redhat.com>
> Signed-off-by: Luwei Kang <luwei.kang@intel.com>
Queued, thanks.
--
Eduardo
prev parent reply other threads:[~2020-03-23 18:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-12 16:48 [PATCH v2] target/i386: set the CPUID level to 0x14 on old machine-type Luwei Kang
2020-03-12 9:19 ` no-reply
2020-03-23 18:32 ` Eduardo Habkost [this message]
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