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From: Paolo Bonzini <pbonzini@redhat.com>
To: Andi Kleen <ak@linux.intel.com>, Wanpeng Li <kernellwp@gmail.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
	"Radim Krčmář" <rkrcmar@redhat.com>,
	"Wanpeng Li" <wanpeng.li@hotmail.com>,
	"Jim Mattson" <jmattson@google.com>
Subject: Re: [PATCH] KVM: VMX: Cache IA32_DEBUGCTL in memory
Date: Wed, 29 Nov 2017 23:26:30 +0100	[thread overview]
Message-ID: <5045320c-3036-4e08-140e-4bb5cf78be24@redhat.com> (raw)
In-Reply-To: <87fu8xj69o.fsf@linux.intel.com>

On 29/11/2017 19:20, Andi Kleen wrote:
> But I haven't looked too closely, but I suspect you'll clobber global
> kernel debugger state this way.

I checked all callers of update_debugctlmsr, and couldn't find any that
could run asynchronously while KVM is caching the value.  For example
__switch_to_xtra would always run before the sched_in notifier.

Thanks,

Paolo

  parent reply	other threads:[~2017-11-29 22:26 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-29  6:07 Wanpeng Li
2017-11-29  8:48 ` Paolo Bonzini
2017-11-29  8:51   ` Wanpeng Li
2017-11-29  9:13     ` Paolo Bonzini
2017-11-29  9:20       ` Wanpeng Li
2017-11-29 18:20 ` Andi Kleen
2017-11-29 19:05   ` Jim Mattson
2017-11-29 20:56     ` Andi Kleen
2017-11-29 22:26   ` Paolo Bonzini [this message]
2017-11-29 22:45     ` Andi Kleen

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