[Bug 116031] New: Many MSR sets are skipped when vcpu type is qemu64.

[Bug 116031] New: Many MSR sets are skipped when vcpu type is qemu64.

[bugzilla-daemon]

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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[Bug 116031] Many MSR sets are skipped when vcpu type is qemu64.

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=116031

--- Comment #1 from changlimin@h3c.com ---
The bug exists when Qemu version >= 2.5

It seems merge these patches to 4.1.x can solve it.
609e36d372ad9329269e4a1467bd35311893d1d6
1cea0ce68ed76490ffa64a9e2a7a40104efe9352
81b1b9ca6d5ca5f3ce91c0095402def657cf5db3

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