linux-kernel - [PATCH 01/14] KVM: monolithic: x86: remove kvm.ko

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Message-Id: <20190928172323.14663-2-aarcange@redhat.com>
Date:   Sat, 28 Sep 2019 13:23:10 -0400
From:   Andrea Arcangeli <aarcange@...hat.com>
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>
Subject: [PATCH 01/14] KVM: monolithic: x86: remove kvm.ko

This is the first commit of a patch series that aims to replace the
modular kvm.ko kernel module with a monolithic kvm-intel/kvm-amd
model. This change has the only possible cons of wasting some disk
space in /lib/modules/. The pros are that it saves CPUS and some minor
RAM which are more scarse resources than disk space.

The pointer to function virtual template model cannot provide any
runtime benefit because kvm-intel and kvm-amd can't be loaded at the
same time.

This removes kvm.ko and it links and duplicates all kvm.ko objects to
both kvm-amd and kvm-intel.

Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
---
 arch/x86/kvm/Makefile | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
index 31ecf7a76d5a..68b81f381369 100644
--- a/arch/x86/kvm/Makefile
+++ b/arch/x86/kvm/Makefile
@@ -12,9 +12,8 @@ kvm-y			+= x86.o mmu.o emulate.o i8259.o irq.o lapic.o \
 			   i8254.o ioapic.o irq_comm.o cpuid.o pmu.o mtrr.o \
 			   hyperv.o page_track.o debugfs.o

-kvm-intel-y		+= vmx/vmx.o vmx/vmenter.o vmx/pmu_intel.o vmx/vmcs12.o vmx/evmcs.o vmx/nested.o
-kvm-amd-y		+= svm.o pmu_amd.o
+kvm-intel-y		+= vmx/vmx.o vmx/vmenter.o vmx/pmu_intel.o vmx/vmcs12.o vmx/evmcs.o vmx/nested.o $(kvm-y)
+kvm-amd-y		+= svm.o pmu_amd.o $(kvm-y)

-obj-$(CONFIG_KVM)	+= kvm.o
 obj-$(CONFIG_KVM_INTEL)	+= kvm-intel.o
 obj-$(CONFIG_KVM_AMD)	+= kvm-amd.o