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Re: port-amd64/47967: DTrace does not work while running under QEMU
The following reply was made to PR port-amd64/47967; it has been noted by GNATS.
From: Jukka Ruohonen <jruohonen%iki.fi@localhost>
Subject: Re: port-amd64/47967: DTrace does not work while running under QEMU
Date: Thu, 27 Jun 2013 03:01:28 +0300
wrote before thinking, which is usual, sorry. But nevertheless.
On Wed, Jun 26, 2013 at 10:30:01PM +0000, Christos Zoulas wrote:
> The following reply was made to PR port-amd64/47967; it has been noted by
> + if (rdmsr(MSR_TSC) != 0)
> + return;
> - /* if QEMU does not implement MSR_TSC, disable the TSC */
> - ci->ci_feat_val &= ~CPUID_MSR;
> - cpu_feature &= ~CPUID_MSR;
> + aprint_error_dev(ci->ci_dev, "Bad MSR_TSC support");
> + cpu_msr_tsc = 0;
This hardly seems right. Now TSC determines whether something is capable of
MSRs? Those are just registers, even for emulators. TM: fixing bugs in the
kernel that are not really bugs, i.e. never has there been in NetBSD actual
x86 hardware for which this wouldn't work.
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