Re: [PATCH 19/24] KVM/VMX: Emulate MSR_IA32_ARCH_CAPABILITIES

[Greg KH <gregkh@linuxfoundation.org>]

On Wed, Apr 18, 2018 at 11:18:27AM +0800, Youquan Song wrote:
> From: KarimAllah Ahmed <karahmed@amazon.de>
> 
> (cherry picked from commit 28c1c9fabf48d6ad596273a11c46e0d0da3e14cd)
> 
> Intel processors use MSR_IA32_ARCH_CAPABILITIES MSR to indicate RDCL_NO
> (bit 0) and IBRS_ALL (bit 1). This is a read-only MSR. By default the
> contents will come directly from the hardware, but user-space can still
> override it.
> 
> [dwmw2: The bit in kvm_cpuid_7_0_edx_x86_features can be unconditional]
> 
> Signed-off-by: KarimAllah Ahmed <karahmed@amazon.de>
> Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
> Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
> Reviewed-by: Jim Mattson <jmattson@google.com>
> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> Cc: Andrea Arcangeli <aarcange@redhat.com>
> Cc: Andi Kleen <ak@linux.intel.com>
> Cc: Jun Nakajima <jun.nakajima@intel.com>
> Cc: kvm@vger.kernel.org
> Cc: Dave Hansen <dave.hansen@intel.com>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Cc: Andy Lutomirski <luto@kernel.org>
> Cc: Asit Mallick <asit.k.mallick@intel.com>
> Cc: Arjan Van De Ven <arjan.van.de.ven@intel.com>
> Cc: Greg KH <gregkh@linuxfoundation.org>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Cc: Tim Chen <tim.c.chen@linux.intel.com>
> Cc: Ashok Raj <ashok.raj@intel.com>
> Link: https://lkml.kernel.org/r/1517522386-18410-4-git-send-email-karahmed@amazon.de
> Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
> Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com> [v4.4 backport]
> 
> Conflicts:
> 	arch/x86/kvm/cpuid.c

And again...