From: bugzilla-daemon@bugzilla.kernel.org
To: kvm@vger.kernel.org
Subject: [Bug 116031] New: Many MSR sets are skipped when vcpu type is qemu64.
Date: Fri, 08 Apr 2016 06:54:48 +0000 [thread overview]
Message-ID: <bug-116031-28872@https.bugzilla.kernel.org/> (raw)
https://bugzilla.kernel.org/show_bug.cgi?id=116031
Bug ID: 116031
Summary: Many MSR sets are skipped when vcpu type is qemu64.
Product: Virtualization
Version: unspecified
Kernel Version: 4.1.x
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: kvm
Assignee: virtualization_kvm@kernel-bugs.osdl.org
Reporter: changlimin@h3c.com
Regression: No
1. When vcpu type is qemu64, cpuid[8000_0001_EDX] does not support EXT2_RDTSCP
on default.
2. Because kvm msrs_to_save contains MSR_TSC_AUX, qemu will set MSR_TSC_AUX in
kvm_put_msrs.
3. In kvm, vmx->rdtscp_enabled is false(see 1), so vmx_set_msr set MSR_TSC_AUX
will return error.
4. In __msr_io, the error will break the loop, so msrs after MSR_TSC_AUX will
be skipped.
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next reply other threads:[~2016-04-08 6:54 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-08 6:54 bugzilla-daemon [this message]
2016-04-08 8:06 ` [Bug 116031] Many MSR sets are skipped when vcpu type is qemu64 bugzilla-daemon
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