linux-kernel - [PATCH v3 00/11] x86: xen cpuid() cleanup

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Message-Id: <20170418063119.11654-1-jgross@suse.com>
Date:   Tue, 18 Apr 2017 08:31:08 +0200
From:   Juergen Gross <jgross@...e.com>
To:     linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org
Cc:     boris.ostrovsky@...cle.com, Juergen Gross <jgross@...e.com>,
        Alok Kataria <akataria@...are.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        virtualization@...ts.linux-foundation.org
Subject: [PATCH v3 00/11] x86: xen cpuid() cleanup

Reduce special casing of xen_cpuid() by using cpu capabilities instead
of faked cpuid nodes.

This cleanup enables us remove the hypervisor specific set_cpu_features
callback as the same effect can be reached via
setup_[clear|force]_cpu_cap().

Removing the rest faked nodes from xen_cpuid() requires some more work
as the remaining cases (mwait leafs and extended topology info) have
to be handled at the consumer sides of this information.

Changes in V3:
- rewrite patch 9 (xsave) to use xgetbv instruction to test for osxsave
  availability (Andrew Cooper)

Changes in V2:
- added several features to this scheme
- removed hypervisor specific set_cpu_features() callbacks

Cc: Alok Kataria <akataria@...are.com> 
Cc: Thomas Gleixner <tglx@...utronix.de> 
Cc: Ingo Molnar <mingo@...hat.com> 
Cc: "H. Peter Anvin" <hpa@...or.com> 
Cc: x86@...nel.org 
Cc: virtualization@...ts.linux-foundation.org

Juergen Gross (11):
  xen: set cpu capabilities from xen_start_kernel()
  x86/xen: don't indicate DCA support in pv domains
  x86/xen: use capabilities instead of fake cpuid values for aperf
  x86/xen: use capabilities instead of fake cpuid values for mtrr
  x86/xen: use capabilities instead of fake cpuid values for acc
  x86/xen: use capabilities instead of fake cpuid values for acpi
  x86/xen: use capabilities instead of fake cpuid values for mwait
  x86/xen: use capabilities instead of fake cpuid values for x2apic
  x86/xen: use capabilities instead of fake cpuid values for xsave
  vmware: set cpu capabilities during platform initialization
  x86/cpu: remove hypervisor specific set_cpu_features

 arch/x86/include/asm/hypervisor.h |  5 ---
 arch/x86/kernel/cpu/common.c      |  1 -
 arch/x86/kernel/cpu/hypervisor.c  |  8 ----
 arch/x86/kernel/cpu/vmware.c      | 39 ++++++++--------
 arch/x86/xen/enlighten_pv.c       | 95 +++++++++++++++++----------------------
 5 files changed, 61 insertions(+), 87 deletions(-)

-- 
2.12.0