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* [PATCH 00/45] KVM: Refactor vCPU creation
@ 2019-10-22  1:58 Sean Christopherson
  2019-10-22  1:58 ` [PATCH 01/45] KVM: PPC: Book3S HV: Uninit vCPU if vcore creation fails Sean Christopherson
                   ` (45 more replies)
  0 siblings, 46 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:58 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

*************************** DISCLAIMER **********************************
The non-x86 arch specific patches are completely untested.  Although the
changes are conceptually straightforward, I'm not remotely confident that
the patches are bug free, e.g. checkpatch caught several blatant typos
that would break compilation.
*************************************************************************

The end goal of this series is to strip down the interface between common
KVM code and arch specific code so that there is precisely one arch hook
for creating a vCPU and one hook for destroying a vCPU.  In addition to
cleaning up the code base, simplifying the interface gives architectures
more freedom to organize their vCPU creation code.

KVM's vCPU creation code is comically messy.  kvm_vm_ioctl_create_vcpu()
calls three separate arch hooks: init(), create() and setup().  The init()
call is especially nasty as it's hidden away in a common KVM function,
kvm_init_vcpu(), that for all intents and purposes must be immediately
invoked after the vcpu object is allocated.

Not to be outdone, vCPU destruction also has three arch hooks: uninit(),
destroy() and free(), the latter of which isn't actually invoked by common
KVM code, but the hook declaration still exists because architectures are
relying on its forward declaration.

Eliminating the extra arch hooks is relatively straightforward, just
tedious.  For the most part, there is no fundamental constraint that
necessitated the proliferation of arch hooks, rather they crept in over
time, usually when x86-centric code was moved out of generic KVM and into
x86 code.

E.g. kvm_arch_vcpu_setup() was added to allow x86 to do vcpu_load(), which
can only be done after preempt_notifier initialization, but adding setup()
overlooked the fact that the preempt_notifier was only initialized after
kvm_arch_vcpu_create() because preemption support was added when x86's MMU
setup (the vcpu_load() user) was called from common KVM code.

For all intents and purposes, there is no true functional change in this
series.  The order of some allocations will change, and a few memory leaks
are fixed, but the actual functionality of a guest should be unaffected.

Patches 01-03 are bug fixes in error handling paths that were found by
inspection when refactoring the associated code.

Patches 04-43 refactor each arch implementation so that the unwanted arch
hooks can be dropped without a functional change, e.g. move code out of
kvm_arch_vcpu_setup() so that all implementations are empty, then drop the
functions and caller.

Patches 44-45 are minor clean up to eliminate kvm_vcpu_uninit().


The net result is to go from this:

        vcpu = kvm_arch_vcpu_create(kvm, id);
               |
               |-> kvm_vcpu_init()
                   |
                   |-> kvm_arch_vcpu_init()

        if (IS_ERR(vcpu)) {
                r = PTR_ERR(vcpu);
                goto vcpu_decrement;
        }

        preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);

        r = kvm_arch_vcpu_setup(vcpu);
        if (r)
                goto vcpu_destroy;

to this:

        r = kvm_arch_vcpu_precreate(kvm, id);
        if (r)
                goto vcpu_decrement;

        vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
        if (!vcpu) {
                r = -ENOMEM;
                goto vcpu_decrement;
        }

        page = alloc_page(GFP_KERNEL | __GFP_ZERO);
        if (!page) {
                r = -ENOMEM;
                goto vcpu_free;
        }
        vcpu->run = page_address(page);

        kvm_vcpu_init(vcpu, kvm, id);

        r = kvm_arch_vcpu_create(vcpu);
        if (r)
                goto vcpu_free_run_page;


Sean Christopherson (45):
  KVM: PPC: Book3S HV: Uninit vCPU if vcore creation fails
  KVM: PPC: Book3S PR: Free shared page if mmu initialization fails
  KVM: x86: Free wbinvd_dirty_mask if vCPU creation fails
  KVM: VMX: Allocate VPID after initializing VCPU
  KVM: VMX: Use direct vcpu pointer during vCPU create/free
  KVM: SVM: Use direct vcpu pointer during vCPU create/free
  KVM: x86: Allocate vcpu struct in common x86 code
  KVM: x86: Move FPU allocation to common x86 code
  KVM: x86: Move allocation of pio_data page down a few lines
  KVM: x86: Move kvm_vcpu_init() invocation to common code
  KVM: PPC: e500mc: Add build-time assert that vcpu is at offset 0
  KVM: PPC: Allocate vcpu struct in common PPC code
  KVM: PPC: Book3S PR: Allocate book3s and shadow vcpu after common init
  KVM: PPC: e500mc: Move reset of oldpir below call to kvm_vcpu_init()
  KVM: PPC: Move kvm_vcpu_init() invocation to common code
  KVM: MIPS: Use kvm_vcpu_cache to allocate vCPUs
  KVM: MIPS: Drop kvm_arch_vcpu_free()
  KVM: PPC: Drop kvm_arch_vcpu_free()
  KVM: arm: Drop kvm_arch_vcpu_free()
  KVM: x86: Remove spurious kvm_mmu_unload() from vcpu destruction path
  KVM: x86: Remove spurious clearing of async #PF MSR
  KVM: x86: Drop kvm_arch_vcpu_free()
  KVM: Remove kvm_arch_vcpu_free() declaration
  KVM: Add kvm_arch_vcpu_precreate() to handle pre-allocation issues
  KVM: s390: Move guts of kvm_arch_vcpu_init() into
    kvm_arch_vcpu_create()
  KVM: s390: Invoke kvm_vcpu_init() before allocating sie_page
  KVM: MIPS: Invoke kvm_vcpu_uninit() immediately prior to freeing vcpu
  KVM: x86: Invoke kvm_vcpu_uninit() immediately prior to freeing vcpu
  KVM: Introduce kvm_vcpu_destroy()
  KVM: Move vcpu alloc and init invocation to common code
  KVM: Unexport kvm_vcpu_cache and kvm_{un}init_vcpu()
  KVM: Move initialization of preempt notifier to kvm_vcpu_init()
  KVM: x86: Move guts of kvm_arch_vcpu_setup() into
    kvm_arch_vcpu_create()
  KVM: MIPS: Move .vcpu_setup() call to kvm_arch_vcpu_create()
  KVM: s390: Manually invoke vcpu setup during kvm_arch_vcpu_create()
  KVM: PPC: BookE: Setup vcpu during kvmppc_core_vcpu_create()
  KVM: Drop kvm_arch_vcpu_setup()
  KVM: x86: Move all vcpu init code into kvm_arch_vcpu_create()
  KVM: MIPS: Move all vcpu init code into kvm_arch_vcpu_create()
  KVM: ARM: Move all vcpu init code into kvm_arch_vcpu_create()
  KVM: PPC: Move all vcpu init code into kvm_arch_vcpu_create()
  KVM: arm64: Free sve_state via arm specific hook
  KVM: Drop kvm_arch_vcpu_init() and kvm_arch_vcpu_uninit()
  KVM: Move putting of vcpu->pid to kvm_vcpu_destroy()
  KVM: Move vcpu->run page allocation out of kvm_vcpu_init()

 arch/arm/include/asm/kvm_host.h    |   2 +-
 arch/arm/kvm/guest.c               |   5 -
 arch/arm64/include/asm/kvm_host.h  |   2 +-
 arch/arm64/kvm/guest.c             |   5 -
 arch/arm64/kvm/reset.c             |   2 +-
 arch/mips/kvm/mips.c               |  84 ++++-------
 arch/powerpc/include/asm/kvm_ppc.h |   6 +-
 arch/powerpc/kvm/book3s.c          |   9 +-
 arch/powerpc/kvm/book3s_hv.c       |  27 +---
 arch/powerpc/kvm/book3s_pr.c       |  33 ++---
 arch/powerpc/kvm/booke.c           |  65 ++++----
 arch/powerpc/kvm/e500.c            |  34 +----
 arch/powerpc/kvm/e500mc.c          |  32 ++--
 arch/powerpc/kvm/powerpc.c         |  70 ++++-----
 arch/s390/include/asm/kvm_host.h   |   1 -
 arch/s390/kvm/kvm-s390.c           | 110 +++++++-------
 arch/x86/include/asm/kvm_host.h    |   2 +-
 arch/x86/kvm/svm.c                 |  52 +------
 arch/x86/kvm/vmx/vmx.c             |  72 +++------
 arch/x86/kvm/x86.c                 | 230 ++++++++++++++---------------
 include/linux/kvm_host.h           |  13 +-
 virt/kvm/arm/arm.c                 |  76 ++++------
 virt/kvm/kvm_main.c                |  71 +++++----
 23 files changed, 387 insertions(+), 616 deletions(-)

-- 
2.22.0

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kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 01/45] KVM: PPC: Book3S HV: Uninit vCPU if vcore creation fails
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
@ 2019-10-22  1:58 ` Sean Christopherson
  2019-10-24  7:04   ` Greg Kurz
  2019-10-22  1:58 ` [PATCH 02/45] KVM: PPC: Book3S PR: Free shared page if mmu initialization fails Sean Christopherson
                   ` (44 subsequent siblings)
  45 siblings, 1 reply; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:58 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Call kvm_vcpu_uninit() if vcore creation fails to avoid leaking any
resources allocated by kvm_vcpu_init(), i.e. the vcpu->run page.

Fixes: 371fefd6f2dc4 ("KVM: PPC: Allow book3s_hv guests to use SMT processor modes")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/powerpc/kvm/book3s_hv.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 709cf1fd4cf4..36abbe3c346d 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -2354,7 +2354,7 @@ static struct kvm_vcpu *kvmppc_core_vcpu_create_hv(struct kvm *kvm,
 	mutex_unlock(&kvm->lock);
 
 	if (!vcore)
-		goto free_vcpu;
+		goto uninit_vcpu;
 
 	spin_lock(&vcore->lock);
 	++vcore->num_threads;
@@ -2371,6 +2371,8 @@ static struct kvm_vcpu *kvmppc_core_vcpu_create_hv(struct kvm *kvm,
 
 	return vcpu;
 
+uninit_vcpu:
+	kvm_vcpu_uninit(vcpu);
 free_vcpu:
 	kmem_cache_free(kvm_vcpu_cache, vcpu);
 out:
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 02/45] KVM: PPC: Book3S PR: Free shared page if mmu initialization fails
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
  2019-10-22  1:58 ` [PATCH 01/45] KVM: PPC: Book3S HV: Uninit vCPU if vcore creation fails Sean Christopherson
@ 2019-10-22  1:58 ` Sean Christopherson
  2019-10-24  7:05   ` Greg Kurz
  2019-10-22  1:58 ` [PATCH 03/45] KVM: x86: Free wbinvd_dirty_mask if vCPU creation fails Sean Christopherson
                   ` (43 subsequent siblings)
  45 siblings, 1 reply; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:58 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Explicitly free the shared page if kvmppc_mmu_init() fails during
kvmppc_core_vcpu_create(), as the page is freed only in
kvmppc_core_vcpu_free(), which is not reached via kvm_vcpu_uninit().

Fixes: 96bc451a15329 ("KVM: PPC: Introduce shared page")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/powerpc/kvm/book3s_pr.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index cc65af8fe6f7..3f6ad3f58628 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c
@@ -1769,10 +1769,12 @@ static struct kvm_vcpu *kvmppc_core_vcpu_create_pr(struct kvm *kvm,
 
 	err = kvmppc_mmu_init(vcpu);
 	if (err < 0)
-		goto uninit_vcpu;
+		goto free_shared_page;
 
 	return vcpu;
 
+free_shared_page:
+	free_page((unsigned long)vcpu->arch.shared);
 uninit_vcpu:
 	kvm_vcpu_uninit(vcpu);
 free_shadow_vcpu:
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 03/45] KVM: x86: Free wbinvd_dirty_mask if vCPU creation fails
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
  2019-10-22  1:58 ` [PATCH 01/45] KVM: PPC: Book3S HV: Uninit vCPU if vcore creation fails Sean Christopherson
  2019-10-22  1:58 ` [PATCH 02/45] KVM: PPC: Book3S PR: Free shared page if mmu initialization fails Sean Christopherson
@ 2019-10-22  1:58 ` Sean Christopherson
  2019-10-22  1:58 ` [PATCH 04/45] KVM: VMX: Allocate VPID after initializing VCPU Sean Christopherson
                   ` (42 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:58 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Free the vCPU's wbinvd_dirty_mask if vCPU creation fails after
kvm_arch_vcpu_init(), e.g. when installing the vCPU's file descriptor.
Do the freeing by calling kvm_arch_vcpu_free() instead of open coding
the freeing.  This adds a likely superfluous, but ultimately harmless,
call to kvmclock_reset(), which only clears vcpu->arch.pv_time_enabled.
Using kvm_arch_vcpu_free() allows for additional cleanup in the future.

Fixes: f5f48ee15c2ee ("KVM: VMX: Execute WBINVD to keep data consistency with assigned devices")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/x86.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index f26f8be4e621..c9a291693279 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9083,7 +9083,7 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 	kvm_mmu_unload(vcpu);
 	vcpu_put(vcpu);
 
-	kvm_x86_ops->vcpu_free(vcpu);
+	kvm_arch_vcpu_free(vcpu);
 }
 
 void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 04/45] KVM: VMX: Allocate VPID after initializing VCPU
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (2 preceding siblings ...)
  2019-10-22  1:58 ` [PATCH 03/45] KVM: x86: Free wbinvd_dirty_mask if vCPU creation fails Sean Christopherson
@ 2019-10-22  1:58 ` Sean Christopherson
  2019-10-22  1:58 ` [PATCH 05/45] KVM: VMX: Use direct vcpu pointer during vCPU create/free Sean Christopherson
                   ` (41 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:58 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Do VPID allocation after calling the common kvm_vcpu_init() as a step
towards doing vCPU allocation (via kmem_cache_zalloc()) and calling
kvm_vcpu_init() back-to-back.  Squishing allocation and initialization
together will eventually allow the sequence to be moved to arch-agnostic
creation code.

Note, the VPID is not consumed until KVM_RUN, slightly delaying its
allocation should have no real function impact.  VPID allocation was
arbitrarily placed in the original patch, commit 2384d2b326408 ("KVM:
VMX: Enable Virtual Processor Identification (VPID)").

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/vmx/vmx.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index e660e28e9ae0..501e88bd6204 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6726,14 +6726,14 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
 		goto free_user_fpu;
 	}
 
-	vmx->vpid = allocate_vpid();
-
 	err = kvm_vcpu_init(&vmx->vcpu, kvm, id);
 	if (err)
 		goto free_vcpu;
 
 	err = -ENOMEM;
 
+	vmx->vpid = allocate_vpid();
+
 	/*
 	 * If PML is turned on, failure on enabling PML just results in failure
 	 * of creating the vcpu, therefore we can simplify PML logic (by
@@ -6823,8 +6823,8 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
 	vmx_destroy_pml_buffer(vmx);
 uninit_vcpu:
 	kvm_vcpu_uninit(&vmx->vcpu);
+	free_vpid(vmx->vpid);
 free_vcpu:
-	free_vpid(vmx->vpid);
 	kmem_cache_free(x86_fpu_cache, vmx->vcpu.arch.guest_fpu);
 free_user_fpu:
 	kmem_cache_free(x86_fpu_cache, vmx->vcpu.arch.user_fpu);
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 05/45] KVM: VMX: Use direct vcpu pointer during vCPU create/free
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (3 preceding siblings ...)
  2019-10-22  1:58 ` [PATCH 04/45] KVM: VMX: Allocate VPID after initializing VCPU Sean Christopherson
@ 2019-10-22  1:58 ` Sean Christopherson
  2019-10-22  1:58 ` [PATCH 06/45] KVM: SVM: " Sean Christopherson
                   ` (40 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:58 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Capture the vcpu pointer in a local varaible and replace '&vmx->vcpu'
references with a direct reference to the pointer in anticipation of
moving bits of the code to common x86 and passing the vcpu pointer into
vmx_create_vcpu(), i.e. eliminate unnecessary noise from future patches.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/vmx/vmx.c | 42 ++++++++++++++++++++++--------------------
 1 file changed, 22 insertions(+), 20 deletions(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 501e88bd6204..70b8d15eb2c5 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6691,17 +6691,17 @@ static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
 	free_loaded_vmcs(vmx->loaded_vmcs);
 	kfree(vmx->guest_msrs);
 	kvm_vcpu_uninit(vcpu);
-	kmem_cache_free(x86_fpu_cache, vmx->vcpu.arch.user_fpu);
-	kmem_cache_free(x86_fpu_cache, vmx->vcpu.arch.guest_fpu);
+	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
+	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
 	kmem_cache_free(kvm_vcpu_cache, vmx);
 }
 
 static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
 {
-	int err;
+	struct kvm_vcpu *vcpu;
 	struct vcpu_vmx *vmx;
 	unsigned long *msr_bitmap;
-	int cpu;
+	int cpu, err;
 
 	BUILD_BUG_ON_MSG(offsetof(struct vcpu_vmx, vcpu) != 0,
 		"struct kvm_vcpu must be at offset 0 for arch usercopy region");
@@ -6710,23 +6710,25 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
 	if (!vmx)
 		return ERR_PTR(-ENOMEM);
 
-	vmx->vcpu.arch.user_fpu = kmem_cache_zalloc(x86_fpu_cache,
-			GFP_KERNEL_ACCOUNT);
-	if (!vmx->vcpu.arch.user_fpu) {
+	vcpu = &vmx->vcpu;
+
+	vcpu->arch.user_fpu = kmem_cache_zalloc(x86_fpu_cache,
+						GFP_KERNEL_ACCOUNT);
+	if (!vcpu->arch.user_fpu) {
 		printk(KERN_ERR "kvm: failed to allocate kvm userspace's fpu\n");
 		err = -ENOMEM;
 		goto free_partial_vcpu;
 	}
 
-	vmx->vcpu.arch.guest_fpu = kmem_cache_zalloc(x86_fpu_cache,
-			GFP_KERNEL_ACCOUNT);
-	if (!vmx->vcpu.arch.guest_fpu) {
+	vcpu->arch.guest_fpu = kmem_cache_zalloc(x86_fpu_cache,
+						 GFP_KERNEL_ACCOUNT);
+	if (!vcpu->arch.guest_fpu) {
 		printk(KERN_ERR "kvm: failed to allocate vcpu's fpu\n");
 		err = -ENOMEM;
 		goto free_user_fpu;
 	}
 
-	err = kvm_vcpu_init(&vmx->vcpu, kvm, id);
+	err = kvm_vcpu_init(vcpu, kvm, id);
 	if (err)
 		goto free_vcpu;
 
@@ -6775,12 +6777,12 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
 
 	vmx->loaded_vmcs = &vmx->vmcs01;
 	cpu = get_cpu();
-	vmx_vcpu_load(&vmx->vcpu, cpu);
-	vmx->vcpu.cpu = cpu;
+	vmx_vcpu_load(vcpu, cpu);
+	vcpu->cpu = cpu;
 	vmx_vcpu_setup(vmx);
-	vmx_vcpu_put(&vmx->vcpu);
+	vmx_vcpu_put(vcpu);
 	put_cpu();
-	if (cpu_need_virtualize_apic_accesses(&vmx->vcpu)) {
+	if (cpu_need_virtualize_apic_accesses(vcpu)) {
 		err = alloc_apic_access_page(kvm);
 		if (err)
 			goto free_vmcs;
@@ -6795,7 +6797,7 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
 	if (nested)
 		nested_vmx_setup_ctls_msrs(&vmx->nested.msrs,
 					   vmx_capability.ept,
-					   kvm_vcpu_apicv_active(&vmx->vcpu));
+					   kvm_vcpu_apicv_active(vcpu));
 	else
 		memset(&vmx->nested.msrs, 0, sizeof(vmx->nested.msrs));
 
@@ -6813,7 +6815,7 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
 
 	vmx->ept_pointer = INVALID_PAGE;
 
-	return &vmx->vcpu;
+	return vcpu;
 
 free_vmcs:
 	free_loaded_vmcs(vmx->loaded_vmcs);
@@ -6822,12 +6824,12 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
 free_pml:
 	vmx_destroy_pml_buffer(vmx);
 uninit_vcpu:
-	kvm_vcpu_uninit(&vmx->vcpu);
+	kvm_vcpu_uninit(vcpu);
 	free_vpid(vmx->vpid);
 free_vcpu:
-	kmem_cache_free(x86_fpu_cache, vmx->vcpu.arch.guest_fpu);
+	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
 free_user_fpu:
-	kmem_cache_free(x86_fpu_cache, vmx->vcpu.arch.user_fpu);
+	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
 free_partial_vcpu:
 	kmem_cache_free(kvm_vcpu_cache, vmx);
 	return ERR_PTR(err);
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 06/45] KVM: SVM: Use direct vcpu pointer during vCPU create/free
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (4 preceding siblings ...)
  2019-10-22  1:58 ` [PATCH 05/45] KVM: VMX: Use direct vcpu pointer during vCPU create/free Sean Christopherson
@ 2019-10-22  1:58 ` " Sean Christopherson
  2019-10-22  1:58 ` [PATCH 07/45] KVM: x86: Allocate vcpu struct in common x86 code Sean Christopherson
                   ` (39 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:58 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Capture the vcpu pointer in a local varaible and replace '&svm->vcpu'
references with a direct reference to the pointer in anticipation of
moving bits of the code to common x86 and passing the vcpu pointer into
svm_create_vcpu(), i.e. eliminate unnecessary noise from future patches.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/svm.c | 30 ++++++++++++++++--------------
 1 file changed, 16 insertions(+), 14 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index e479ea9bc9da..2f66c52e1b5d 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2140,6 +2140,7 @@ static int avic_init_vcpu(struct vcpu_svm *svm)
 
 static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
 {
+	struct kvm_vcpu *vcpu;
 	struct vcpu_svm *svm;
 	struct page *page;
 	struct page *msrpm_pages;
@@ -2155,24 +2156,25 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
 		err = -ENOMEM;
 		goto out;
 	}
+	vcpu = &svm->vcpu;
 
-	svm->vcpu.arch.user_fpu = kmem_cache_zalloc(x86_fpu_cache,
-						     GFP_KERNEL_ACCOUNT);
-	if (!svm->vcpu.arch.user_fpu) {
+	vcpu->arch.user_fpu = kmem_cache_zalloc(x86_fpu_cache,
+						GFP_KERNEL_ACCOUNT);
+	if (!vcpu->arch.user_fpu) {
 		printk(KERN_ERR "kvm: failed to allocate kvm userspace's fpu\n");
 		err = -ENOMEM;
 		goto free_partial_svm;
 	}
 
-	svm->vcpu.arch.guest_fpu = kmem_cache_zalloc(x86_fpu_cache,
-						     GFP_KERNEL_ACCOUNT);
-	if (!svm->vcpu.arch.guest_fpu) {
+	vcpu->arch.guest_fpu = kmem_cache_zalloc(x86_fpu_cache,
+						 GFP_KERNEL_ACCOUNT);
+	if (!vcpu->arch.guest_fpu) {
 		printk(KERN_ERR "kvm: failed to allocate vcpu's fpu\n");
 		err = -ENOMEM;
 		goto free_user_fpu;
 	}
 
-	err = kvm_vcpu_init(&svm->vcpu, kvm, id);
+	err = kvm_vcpu_init(vcpu, kvm, id);
 	if (err)
 		goto free_svm;
 
@@ -2216,9 +2218,9 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
 	svm->asid_generation = 0;
 	init_vmcb(svm);
 
-	svm_init_osvw(&svm->vcpu);
+	svm_init_osvw(vcpu);
 
-	return &svm->vcpu;
+	return vcpu;
 
 free_page4:
 	__free_page(hsave_page);
@@ -2229,11 +2231,11 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
 free_page1:
 	__free_page(page);
 uninit:
-	kvm_vcpu_uninit(&svm->vcpu);
+	kvm_vcpu_uninit(vcpu);
 free_svm:
-	kmem_cache_free(x86_fpu_cache, svm->vcpu.arch.guest_fpu);
+	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
 free_user_fpu:
-	kmem_cache_free(x86_fpu_cache, svm->vcpu.arch.user_fpu);
+	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
 free_partial_svm:
 	kmem_cache_free(kvm_vcpu_cache, svm);
 out:
@@ -2264,8 +2266,8 @@ static void svm_free_vcpu(struct kvm_vcpu *vcpu)
 	__free_page(virt_to_page(svm->nested.hsave));
 	__free_pages(virt_to_page(svm->nested.msrpm), MSRPM_ALLOC_ORDER);
 	kvm_vcpu_uninit(vcpu);
-	kmem_cache_free(x86_fpu_cache, svm->vcpu.arch.user_fpu);
-	kmem_cache_free(x86_fpu_cache, svm->vcpu.arch.guest_fpu);
+	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
+	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
 	kmem_cache_free(kvm_vcpu_cache, svm);
 }
 
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 07/45] KVM: x86: Allocate vcpu struct in common x86 code
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (5 preceding siblings ...)
  2019-10-22  1:58 ` [PATCH 06/45] KVM: SVM: " Sean Christopherson
@ 2019-10-22  1:58 ` Sean Christopherson
  2019-10-22  1:58 ` [PATCH 08/45] KVM: x86: Move FPU allocation to " Sean Christopherson
                   ` (38 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:58 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Move allocation of VMX and SVM vcpus to common x86.  Although the struct
being allocated is technically a VMX/SVM struct, it can be interpreted
directly as a 'struct kvm_vcpu' because of the pre-existing requirement
that 'struct kvm_vcpu' be located at offset zero of the arch/vendor vcpu
struct.

Remove the message from the build-time assertions regarding placement of
the struct, as compatibility with the arch usercopy region is no longer
the sole dependent on 'struct kvm_vcpu' being at offset zero.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/include/asm/kvm_host.h |  2 +-
 arch/x86/kvm/svm.c              | 28 +++++++++-------------------
 arch/x86/kvm/vmx/vmx.c          | 24 ++++++++----------------
 arch/x86/kvm/x86.c              | 16 ++++++++++++----
 4 files changed, 30 insertions(+), 40 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 5d8056ff7390..77581eeb02e3 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1014,7 +1014,7 @@ struct kvm_x86_ops {
 	void (*vm_destroy)(struct kvm *kvm);
 
 	/* Create, but do not attach this VCPU */
-	struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
+	int (*vcpu_create)(struct kvm *kvm, struct kvm_vcpu *vcpu, unsigned id);
 	void (*vcpu_free)(struct kvm_vcpu *vcpu);
 	void (*vcpu_reset)(struct kvm_vcpu *vcpu, bool init_event);
 
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 2f66c52e1b5d..bbc5dac9d400 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2138,9 +2138,9 @@ static int avic_init_vcpu(struct vcpu_svm *svm)
 	return ret;
 }
 
-static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
+static int svm_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
+			   unsigned int id)
 {
-	struct kvm_vcpu *vcpu;
 	struct vcpu_svm *svm;
 	struct page *page;
 	struct page *msrpm_pages;
@@ -2148,22 +2148,15 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
 	struct page *nested_msrpm_pages;
 	int err;
 
-	BUILD_BUG_ON_MSG(offsetof(struct vcpu_svm, vcpu) != 0,
-		"struct kvm_vcpu must be at offset 0 for arch usercopy region");
-
-	svm = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL_ACCOUNT);
-	if (!svm) {
-		err = -ENOMEM;
-		goto out;
-	}
-	vcpu = &svm->vcpu;
+	BUILD_BUG_ON(offsetof(struct vcpu_svm, vcpu) != 0);
+	svm = to_svm(vcpu);
 
 	vcpu->arch.user_fpu = kmem_cache_zalloc(x86_fpu_cache,
 						GFP_KERNEL_ACCOUNT);
 	if (!vcpu->arch.user_fpu) {
 		printk(KERN_ERR "kvm: failed to allocate kvm userspace's fpu\n");
 		err = -ENOMEM;
-		goto free_partial_svm;
+		goto out;
 	}
 
 	vcpu->arch.guest_fpu = kmem_cache_zalloc(x86_fpu_cache,
@@ -2176,7 +2169,7 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
 
 	err = kvm_vcpu_init(vcpu, kvm, id);
 	if (err)
-		goto free_svm;
+		goto free_guest_fpu;
 
 	err = -ENOMEM;
 	page = alloc_page(GFP_KERNEL_ACCOUNT);
@@ -2220,7 +2213,7 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
 
 	svm_init_osvw(vcpu);
 
-	return vcpu;
+	return 0;
 
 free_page4:
 	__free_page(hsave_page);
@@ -2232,14 +2225,12 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
 	__free_page(page);
 uninit:
 	kvm_vcpu_uninit(vcpu);
-free_svm:
+free_guest_fpu:
 	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
 free_user_fpu:
 	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
-free_partial_svm:
-	kmem_cache_free(kvm_vcpu_cache, svm);
 out:
-	return ERR_PTR(err);
+	return err;
 }
 
 static void svm_clear_current_vmcb(struct vmcb *vmcb)
@@ -2268,7 +2259,6 @@ static void svm_free_vcpu(struct kvm_vcpu *vcpu)
 	kvm_vcpu_uninit(vcpu);
 	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
 	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
-	kmem_cache_free(kvm_vcpu_cache, svm);
 }
 
 static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 70b8d15eb2c5..832d8e38acd4 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6693,31 +6693,24 @@ static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
 	kvm_vcpu_uninit(vcpu);
 	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
 	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
-	kmem_cache_free(kvm_vcpu_cache, vmx);
 }
 
-static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
+static int vmx_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
+			   unsigned int id)
 {
-	struct kvm_vcpu *vcpu;
 	struct vcpu_vmx *vmx;
 	unsigned long *msr_bitmap;
 	int cpu, err;
 
-	BUILD_BUG_ON_MSG(offsetof(struct vcpu_vmx, vcpu) != 0,
-		"struct kvm_vcpu must be at offset 0 for arch usercopy region");
-
-	vmx = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL_ACCOUNT);
-	if (!vmx)
-		return ERR_PTR(-ENOMEM);
-
-	vcpu = &vmx->vcpu;
+	BUILD_BUG_ON(offsetof(struct vcpu_vmx, vcpu) != 0);
+	vmx = to_vmx(vcpu);
 
 	vcpu->arch.user_fpu = kmem_cache_zalloc(x86_fpu_cache,
 						GFP_KERNEL_ACCOUNT);
 	if (!vcpu->arch.user_fpu) {
 		printk(KERN_ERR "kvm: failed to allocate kvm userspace's fpu\n");
 		err = -ENOMEM;
-		goto free_partial_vcpu;
+		goto out;
 	}
 
 	vcpu->arch.guest_fpu = kmem_cache_zalloc(x86_fpu_cache,
@@ -6815,7 +6808,7 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
 
 	vmx->ept_pointer = INVALID_PAGE;
 
-	return vcpu;
+	return 0;
 
 free_vmcs:
 	free_loaded_vmcs(vmx->loaded_vmcs);
@@ -6830,9 +6823,8 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
 	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
 free_user_fpu:
 	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
-free_partial_vcpu:
-	kmem_cache_free(kvm_vcpu_cache, vmx);
-	return ERR_PTR(err);
+out:
+	return err;
 }
 
 #define L1TF_MSG_SMT "L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details.\n"
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c9a291693279..45b296a9fdbb 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9012,26 +9012,34 @@ static void fx_init(struct kvm_vcpu *vcpu)
 
 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 {
-	void *wbinvd_dirty_mask = vcpu->arch.wbinvd_dirty_mask;
-
 	kvmclock_reset(vcpu);
 
 	kvm_x86_ops->vcpu_free(vcpu);
-	free_cpumask_var(wbinvd_dirty_mask);
+
+	free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
+	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
 
 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
 						unsigned int id)
 {
 	struct kvm_vcpu *vcpu;
+	int r;
 
 	if (kvm_check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0)
 		printk_once(KERN_WARNING
 		"kvm: SMP vm created on host with unstable TSC; "
 		"guest TSC will not be reliable\n");
 
-	vcpu = kvm_x86_ops->vcpu_create(kvm, id);
+	vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL_ACCOUNT);
+	if (!vcpu)
+		return ERR_PTR(-ENOMEM);
 
+	r = kvm_x86_ops->vcpu_create(kvm, vcpu, id);
+	if (r) {
+		kmem_cache_free(kvm_vcpu_cache, vcpu);
+		return ERR_PTR(r);
+	}
 	return vcpu;
 }
 
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 08/45] KVM: x86: Move FPU allocation to common x86 code
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (6 preceding siblings ...)
  2019-10-22  1:58 ` [PATCH 07/45] KVM: x86: Allocate vcpu struct in common x86 code Sean Christopherson
@ 2019-10-22  1:58 ` " Sean Christopherson
  2019-10-22  1:58 ` [PATCH 09/45] KVM: x86: Move allocation of pio_data page down a few lines Sean Christopherson
                   ` (37 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:58 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

The allocation of FPU structs is identical across VMX and SVM, move it
to common x86 code.  Somewhat arbitrarily place the allocation so that
it resides directly above the associated initialization via fx_init(),
e.g. instead of retaining its position with respect to the overall vcpu
creation flow.  Although the names names kvm_arch_vcpu_create() and
kvm_arch_vcpu_init() might suggest otherwise, x86 does not have a clean
split between 'create' and 'init'.  Allocating the struct immediately
prior to the first use arguably improves readability *now*, and will
yield even bigger improvements when kvm_arch_vcpu_init() is removed in
a future patch.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/svm.c     | 25 +------------------------
 arch/x86/kvm/vmx/vmx.c | 25 +------------------------
 arch/x86/kvm/x86.c     | 21 +++++++++++++++++++++
 3 files changed, 23 insertions(+), 48 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index bbc5dac9d400..dc4e835f7d46 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2151,25 +2151,9 @@ static int svm_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	BUILD_BUG_ON(offsetof(struct vcpu_svm, vcpu) != 0);
 	svm = to_svm(vcpu);
 
-	vcpu->arch.user_fpu = kmem_cache_zalloc(x86_fpu_cache,
-						GFP_KERNEL_ACCOUNT);
-	if (!vcpu->arch.user_fpu) {
-		printk(KERN_ERR "kvm: failed to allocate kvm userspace's fpu\n");
-		err = -ENOMEM;
-		goto out;
-	}
-
-	vcpu->arch.guest_fpu = kmem_cache_zalloc(x86_fpu_cache,
-						 GFP_KERNEL_ACCOUNT);
-	if (!vcpu->arch.guest_fpu) {
-		printk(KERN_ERR "kvm: failed to allocate vcpu's fpu\n");
-		err = -ENOMEM;
-		goto free_user_fpu;
-	}
-
 	err = kvm_vcpu_init(vcpu, kvm, id);
 	if (err)
-		goto free_guest_fpu;
+		return err;
 
 	err = -ENOMEM;
 	page = alloc_page(GFP_KERNEL_ACCOUNT);
@@ -2225,11 +2209,6 @@ static int svm_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	__free_page(page);
 uninit:
 	kvm_vcpu_uninit(vcpu);
-free_guest_fpu:
-	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
-free_user_fpu:
-	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
-out:
 	return err;
 }
 
@@ -2257,8 +2236,6 @@ static void svm_free_vcpu(struct kvm_vcpu *vcpu)
 	__free_page(virt_to_page(svm->nested.hsave));
 	__free_pages(virt_to_page(svm->nested.msrpm), MSRPM_ALLOC_ORDER);
 	kvm_vcpu_uninit(vcpu);
-	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
-	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
 }
 
 static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 832d8e38acd4..1973029c5c77 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6691,8 +6691,6 @@ static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
 	free_loaded_vmcs(vmx->loaded_vmcs);
 	kfree(vmx->guest_msrs);
 	kvm_vcpu_uninit(vcpu);
-	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
-	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
 }
 
 static int vmx_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
@@ -6705,25 +6703,9 @@ static int vmx_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	BUILD_BUG_ON(offsetof(struct vcpu_vmx, vcpu) != 0);
 	vmx = to_vmx(vcpu);
 
-	vcpu->arch.user_fpu = kmem_cache_zalloc(x86_fpu_cache,
-						GFP_KERNEL_ACCOUNT);
-	if (!vcpu->arch.user_fpu) {
-		printk(KERN_ERR "kvm: failed to allocate kvm userspace's fpu\n");
-		err = -ENOMEM;
-		goto out;
-	}
-
-	vcpu->arch.guest_fpu = kmem_cache_zalloc(x86_fpu_cache,
-						 GFP_KERNEL_ACCOUNT);
-	if (!vcpu->arch.guest_fpu) {
-		printk(KERN_ERR "kvm: failed to allocate vcpu's fpu\n");
-		err = -ENOMEM;
-		goto free_user_fpu;
-	}
-
 	err = kvm_vcpu_init(vcpu, kvm, id);
 	if (err)
-		goto free_vcpu;
+		return err;
 
 	err = -ENOMEM;
 
@@ -6819,11 +6801,6 @@ static int vmx_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
 uninit_vcpu:
 	kvm_vcpu_uninit(vcpu);
 	free_vpid(vmx->vpid);
-free_vcpu:
-	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
-free_user_fpu:
-	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
-out:
 	return err;
 }
 
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 45b296a9fdbb..777a29b3c38b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9017,6 +9017,8 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 	kvm_x86_ops->vcpu_free(vcpu);
 
 	free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
+	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
+	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
 	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
 
@@ -9371,6 +9373,21 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 		goto fail_free_mce_banks;
 	}
 
+	vcpu->arch.user_fpu = kmem_cache_zalloc(x86_fpu_cache,
+						GFP_KERNEL_ACCOUNT);
+	if (!vcpu->arch.user_fpu) {
+		pr_err("kvm: failed to allocate userspace's fpu\n");
+		r = -ENOMEM;
+		goto free_wbinvd_dirty_mask;
+	}
+
+	vcpu->arch.guest_fpu = kmem_cache_zalloc(x86_fpu_cache,
+						 GFP_KERNEL_ACCOUNT);
+	if (!vcpu->arch.guest_fpu) {
+		pr_err("kvm: failed to allocate vcpu's fpu\n");
+		r = -ENOMEM;
+		goto free_user_fpu;
+	}
 	fx_init(vcpu);
 
 	vcpu->arch.guest_xstate_size = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET;
@@ -9389,6 +9406,10 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 
 	return 0;
 
+free_user_fpu:
+	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
+free_wbinvd_dirty_mask:
+	free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
 fail_free_mce_banks:
 	kfree(vcpu->arch.mce_banks);
 fail_free_lapic:
-- 
2.22.0

_______________________________________________
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kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 09/45] KVM: x86: Move allocation of pio_data page down a few lines
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (7 preceding siblings ...)
  2019-10-22  1:58 ` [PATCH 08/45] KVM: x86: Move FPU allocation to " Sean Christopherson
@ 2019-10-22  1:58 ` Sean Christopherson
  2019-10-22  1:58 ` [PATCH 10/45] KVM: x86: Move kvm_vcpu_init() invocation to common code Sean Christopherson
                   ` (36 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:58 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Allocate the pio_data page after creating the MMU and local APIC so that
all direct memory allocations are grouped together.  This allows setting
the return value to -ENOMEM prior to starting the allocations instead of
setting it in the fail path for every allocation.

The pio_data page is only consumed when KVM_RUN is invoked, i.e. moving
its allocation has no real functional impact.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/x86.c | 33 +++++++++++++--------------------
 1 file changed, 13 insertions(+), 20 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 777a29b3c38b..b33ca472ff4f 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9338,18 +9338,11 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 	else
 		vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;
 
-	page = alloc_page(GFP_KERNEL | __GFP_ZERO);
-	if (!page) {
-		r = -ENOMEM;
-		goto fail;
-	}
-	vcpu->arch.pio_data = page_address(page);
-
 	kvm_set_tsc_khz(vcpu, max_tsc_khz);
 
 	r = kvm_mmu_create(vcpu);
 	if (r < 0)
-		goto fail_free_pio_data;
+		return r;
 
 	if (irqchip_in_kernel(vcpu->kvm)) {
 		vcpu->arch.apicv_active = kvm_x86_ops->get_enable_apicv(vcpu->kvm);
@@ -9359,25 +9352,27 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 	} else
 		static_key_slow_inc(&kvm_no_apic_vcpu);
 
+	r = -ENOMEM;
+
+	page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+	if (!page)
+		goto fail_free_lapic;
+	vcpu->arch.pio_data = page_address(page);
+
 	vcpu->arch.mce_banks = kzalloc(KVM_MAX_MCE_BANKS * sizeof(u64) * 4,
 				       GFP_KERNEL_ACCOUNT);
-	if (!vcpu->arch.mce_banks) {
-		r = -ENOMEM;
-		goto fail_free_lapic;
-	}
+	if (!vcpu->arch.mce_banks)
+		goto fail_free_pio_data;
 	vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS;
 
 	if (!zalloc_cpumask_var(&vcpu->arch.wbinvd_dirty_mask,
-				GFP_KERNEL_ACCOUNT)) {
-		r = -ENOMEM;
+				GFP_KERNEL_ACCOUNT))
 		goto fail_free_mce_banks;
-	}
 
 	vcpu->arch.user_fpu = kmem_cache_zalloc(x86_fpu_cache,
 						GFP_KERNEL_ACCOUNT);
 	if (!vcpu->arch.user_fpu) {
 		pr_err("kvm: failed to allocate userspace's fpu\n");
-		r = -ENOMEM;
 		goto free_wbinvd_dirty_mask;
 	}
 
@@ -9385,7 +9380,6 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 						 GFP_KERNEL_ACCOUNT);
 	if (!vcpu->arch.guest_fpu) {
 		pr_err("kvm: failed to allocate vcpu's fpu\n");
-		r = -ENOMEM;
 		goto free_user_fpu;
 	}
 	fx_init(vcpu);
@@ -9412,13 +9406,12 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 	free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
 fail_free_mce_banks:
 	kfree(vcpu->arch.mce_banks);
+fail_free_pio_data:
+	free_page((unsigned long)vcpu->arch.pio_data);
 fail_free_lapic:
 	kvm_free_lapic(vcpu);
 fail_mmu_destroy:
 	kvm_mmu_destroy(vcpu);
-fail_free_pio_data:
-	free_page((unsigned long)vcpu->arch.pio_data);
-fail:
 	return r;
 }
 
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 10/45] KVM: x86: Move kvm_vcpu_init() invocation to common code
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (8 preceding siblings ...)
  2019-10-22  1:58 ` [PATCH 09/45] KVM: x86: Move allocation of pio_data page down a few lines Sean Christopherson
@ 2019-10-22  1:58 ` Sean Christopherson
  2019-10-22  1:58 ` [PATCH 11/45] KVM: PPC: e500mc: Add build-time assert that vcpu is at offset 0 Sean Christopherson
                   ` (35 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:58 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Move the kvm_cpu_{un}init() calls to common x86 code as an intermediate
step to removing kvm_cpu_{un}init() altogether.

Note, VMX'x alloc_apic_access_page() and init_rmode_identity_map() are
per-VM allocations and are intentionally kept if vCPU creation fails.
They are freed by kvm_arch_destroy_vm().

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/include/asm/kvm_host.h |  2 +-
 arch/x86/kvm/svm.c              | 13 +++----------
 arch/x86/kvm/vmx/vmx.c          | 19 ++++++-------------
 arch/x86/kvm/x86.c              | 20 +++++++++++++++-----
 4 files changed, 25 insertions(+), 29 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 77581eeb02e3..89d3ff1d6e4d 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1014,7 +1014,7 @@ struct kvm_x86_ops {
 	void (*vm_destroy)(struct kvm *kvm);
 
 	/* Create, but do not attach this VCPU */
-	int (*vcpu_create)(struct kvm *kvm, struct kvm_vcpu *vcpu, unsigned id);
+	int (*vcpu_create)(struct kvm_vcpu *vcpu);
 	void (*vcpu_free)(struct kvm_vcpu *vcpu);
 	void (*vcpu_reset)(struct kvm_vcpu *vcpu, bool init_event);
 
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index dc4e835f7d46..5d31016d69ee 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2138,8 +2138,7 @@ static int avic_init_vcpu(struct vcpu_svm *svm)
 	return ret;
 }
 
-static int svm_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
-			   unsigned int id)
+static int svm_create_vcpu(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_svm *svm;
 	struct page *page;
@@ -2151,14 +2150,10 @@ static int svm_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	BUILD_BUG_ON(offsetof(struct vcpu_svm, vcpu) != 0);
 	svm = to_svm(vcpu);
 
-	err = kvm_vcpu_init(vcpu, kvm, id);
-	if (err)
-		return err;
-
 	err = -ENOMEM;
 	page = alloc_page(GFP_KERNEL_ACCOUNT);
 	if (!page)
-		goto uninit;
+		goto out;
 
 	msrpm_pages = alloc_pages(GFP_KERNEL_ACCOUNT, MSRPM_ALLOC_ORDER);
 	if (!msrpm_pages)
@@ -2207,8 +2202,7 @@ static int svm_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	__free_pages(msrpm_pages, MSRPM_ALLOC_ORDER);
 free_page1:
 	__free_page(page);
-uninit:
-	kvm_vcpu_uninit(vcpu);
+out:
 	return err;
 }
 
@@ -2235,7 +2229,6 @@ static void svm_free_vcpu(struct kvm_vcpu *vcpu)
 	__free_pages(virt_to_page(svm->msrpm), MSRPM_ALLOC_ORDER);
 	__free_page(virt_to_page(svm->nested.hsave));
 	__free_pages(virt_to_page(svm->nested.msrpm), MSRPM_ALLOC_ORDER);
-	kvm_vcpu_uninit(vcpu);
 }
 
 static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 1973029c5c77..eea03e6fbfa3 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6690,11 +6690,9 @@ static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
 	nested_vmx_free_vcpu(vcpu);
 	free_loaded_vmcs(vmx->loaded_vmcs);
 	kfree(vmx->guest_msrs);
-	kvm_vcpu_uninit(vcpu);
 }
 
-static int vmx_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
-			   unsigned int id)
+static int vmx_create_vcpu(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_vmx *vmx;
 	unsigned long *msr_bitmap;
@@ -6703,10 +6701,6 @@ static int vmx_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	BUILD_BUG_ON(offsetof(struct vcpu_vmx, vcpu) != 0);
 	vmx = to_vmx(vcpu);
 
-	err = kvm_vcpu_init(vcpu, kvm, id);
-	if (err)
-		return err;
-
 	err = -ENOMEM;
 
 	vmx->vpid = allocate_vpid();
@@ -6720,7 +6714,7 @@ static int vmx_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	if (enable_pml) {
 		vmx->pml_pg = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO);
 		if (!vmx->pml_pg)
-			goto uninit_vcpu;
+			goto free_vpid;
 	}
 
 	vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL_ACCOUNT);
@@ -6742,7 +6736,7 @@ static int vmx_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_SYSENTER_CS, MSR_TYPE_RW);
 	vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_SYSENTER_ESP, MSR_TYPE_RW);
 	vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_SYSENTER_EIP, MSR_TYPE_RW);
-	if (kvm_cstate_in_guest(kvm)) {
+	if (kvm_cstate_in_guest(vcpu->kvm)) {
 		vmx_disable_intercept_for_msr(msr_bitmap, MSR_CORE_C1_RES, MSR_TYPE_R);
 		vmx_disable_intercept_for_msr(msr_bitmap, MSR_CORE_C3_RESIDENCY, MSR_TYPE_R);
 		vmx_disable_intercept_for_msr(msr_bitmap, MSR_CORE_C6_RESIDENCY, MSR_TYPE_R);
@@ -6758,13 +6752,13 @@ static int vmx_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	vmx_vcpu_put(vcpu);
 	put_cpu();
 	if (cpu_need_virtualize_apic_accesses(vcpu)) {
-		err = alloc_apic_access_page(kvm);
+		err = alloc_apic_access_page(vcpu->kvm);
 		if (err)
 			goto free_vmcs;
 	}
 
 	if (enable_ept && !enable_unrestricted_guest) {
-		err = init_rmode_identity_map(kvm);
+		err = init_rmode_identity_map(vcpu->kvm);
 		if (err)
 			goto free_vmcs;
 	}
@@ -6798,8 +6792,7 @@ static int vmx_create_vcpu(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	kfree(vmx->guest_msrs);
 free_pml:
 	vmx_destroy_pml_buffer(vmx);
-uninit_vcpu:
-	kvm_vcpu_uninit(vcpu);
+free_vpid:
 	free_vpid(vmx->vpid);
 	return err;
 }
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index b33ca472ff4f..3a6d8c4a9758 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9016,6 +9016,8 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 
 	kvm_x86_ops->vcpu_free(vcpu);
 
+	kvm_vcpu_uninit(vcpu);
+
 	free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
 	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
 	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
@@ -9037,12 +9039,20 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
 	if (!vcpu)
 		return ERR_PTR(-ENOMEM);
 
-	r = kvm_x86_ops->vcpu_create(kvm, vcpu, id);
-	if (r) {
-		kmem_cache_free(kvm_vcpu_cache, vcpu);
-		return ERR_PTR(r);
-	}
+	r = kvm_vcpu_init(vcpu, kvm, id);
+	if (r)
+		goto free_vcpu;
+
+	r = kvm_x86_ops->vcpu_create(vcpu);
+	if (r)
+		goto uninit_vcpu;
 	return vcpu;
+
+uninit_vcpu:
+	kvm_vcpu_uninit(vcpu);
+free_vcpu:
+	kmem_cache_free(kvm_vcpu_cache, vcpu);
+	return ERR_PTR(r);
 }
 
 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 11/45] KVM: PPC: e500mc: Add build-time assert that vcpu is at offset 0
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (9 preceding siblings ...)
  2019-10-22  1:58 ` [PATCH 10/45] KVM: x86: Move kvm_vcpu_init() invocation to common code Sean Christopherson
@ 2019-10-22  1:58 ` Sean Christopherson
  2019-10-22  1:58 ` [PATCH 12/45] KVM: PPC: Allocate vcpu struct in common PPC code Sean Christopherson
                   ` (34 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:58 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

In preparation for moving vcpu allocation to common PPC code, add an
explicit, albeit redundant, build-time assert to ensure the vcpu member
is located at offset 0.  The assert is redundant in the sense that
kvmppc_core_vcpu_create_e500() contains a functionally identical assert.
The motiviation for adding the extra assert is to provide visual
confirmation of the correctness of moving vcpu allocation to common
code.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/powerpc/kvm/e500mc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/kvm/e500mc.c b/arch/powerpc/kvm/e500mc.c
index 318e65c65999..c51f4bb086fd 100644
--- a/arch/powerpc/kvm/e500mc.c
+++ b/arch/powerpc/kvm/e500mc.c
@@ -308,6 +308,8 @@ static struct kvm_vcpu *kvmppc_core_vcpu_create_e500mc(struct kvm *kvm,
 	struct kvm_vcpu *vcpu;
 	int err;
 
+	BUILD_BUG_ON(offsetof(struct kvmppc_vcpu_e500, vcpu) != 0);
+
 	vcpu_e500 = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 	if (!vcpu_e500) {
 		err = -ENOMEM;
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 12/45] KVM: PPC: Allocate vcpu struct in common PPC code
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (10 preceding siblings ...)
  2019-10-22  1:58 ` [PATCH 11/45] KVM: PPC: e500mc: Add build-time assert that vcpu is at offset 0 Sean Christopherson
@ 2019-10-22  1:58 ` Sean Christopherson
  2019-10-22  1:58 ` [PATCH 13/45] KVM: PPC: Book3S PR: Allocate book3s and shadow vcpu after common init Sean Christopherson
                   ` (33 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:58 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Move allocation of all flavors of PPC vCPUs to common PPC code.  All
variants either allocate 'struct kvm_vcpu' directly, or require that
the embedded 'struct kvm_vcpu' member be located at offset 0, i.e.
guarantee that the allocation can be directly interpreted as a 'struct
kvm_vcpu' object.

Remove the message from the build-time assertion regarding placement of
the struct, as compatibility with the arch usercopy region is no longer
the sole dependent on 'struct kvm_vcpu' being at offset zero.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/powerpc/include/asm/kvm_ppc.h |  7 ++++---
 arch/powerpc/kvm/book3s.c          |  5 +++--
 arch/powerpc/kvm/book3s_hv.c       | 20 +++++---------------
 arch/powerpc/kvm/book3s_pr.c       | 18 +++++-------------
 arch/powerpc/kvm/booke.c           |  5 +++--
 arch/powerpc/kvm/e500.c            | 24 ++++++------------------
 arch/powerpc/kvm/e500mc.c          | 22 +++++-----------------
 arch/powerpc/kvm/powerpc.c         | 23 ++++++++++++++++++-----
 8 files changed, 49 insertions(+), 75 deletions(-)

diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
index ee62776e5433..a7795339df92 100644
--- a/arch/powerpc/include/asm/kvm_ppc.h
+++ b/arch/powerpc/include/asm/kvm_ppc.h
@@ -119,8 +119,8 @@ extern int kvmppc_xlate(struct kvm_vcpu *vcpu, ulong eaddr,
 			enum xlate_instdata xlid, enum xlate_readwrite xlrw,
 			struct kvmppc_pte *pte);
 
-extern struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm,
-                                                unsigned int id);
+extern int kvmppc_core_vcpu_create(struct kvm *kvm, struct kvm_vcpu *vcpu,
+				   unsigned int id);
 extern void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu);
 extern int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu);
 extern int kvmppc_core_check_processor_compat(void);
@@ -273,7 +273,8 @@ struct kvmppc_ops {
 	void (*vcpu_put)(struct kvm_vcpu *vcpu);
 	void (*set_msr)(struct kvm_vcpu *vcpu, u64 msr);
 	int (*vcpu_run)(struct kvm_run *run, struct kvm_vcpu *vcpu);
-	struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned int id);
+	int (*vcpu_create)(struct kvm *kvm, struct kvm_vcpu *vcpu,
+			   unsigned int id);
 	void (*vcpu_free)(struct kvm_vcpu *vcpu);
 	int (*check_requests)(struct kvm_vcpu *vcpu);
 	int (*get_dirty_log)(struct kvm *kvm, struct kvm_dirty_log *log);
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index ec2547cc5ecb..241ae3e114d2 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -814,9 +814,10 @@ void kvmppc_decrementer_func(struct kvm_vcpu *vcpu)
 	kvm_vcpu_kick(vcpu);
 }
 
-struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
+int kvmppc_core_vcpu_create(struct kvm *kvm, struct kvm_vcpu *vcpu,
+			    unsigned int id)
 {
-	return kvm->arch.kvm_ops->vcpu_create(kvm, id);
+	return kvm->arch.kvm_ops->vcpu_create(kvm, vcpu, id);
 }
 
 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 36abbe3c346d..103a7599c2d1 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -2257,22 +2257,16 @@ static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id)
 }
 #endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
 
-static struct kvm_vcpu *kvmppc_core_vcpu_create_hv(struct kvm *kvm,
-						   unsigned int id)
+static int kvmppc_core_vcpu_create_hv(struct kvm *kvm, struct kvm_vcpu *vcpu,
+				      unsigned int id)
 {
-	struct kvm_vcpu *vcpu;
 	int err;
 	int core;
 	struct kvmppc_vcore *vcore;
 
-	err = -ENOMEM;
-	vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
-	if (!vcpu)
-		goto out;
-
 	err = kvm_vcpu_init(vcpu, kvm, id);
 	if (err)
-		goto free_vcpu;
+		return err;
 
 	vcpu->arch.shared = &vcpu->arch.shregs;
 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
@@ -2369,14 +2363,11 @@ static struct kvm_vcpu *kvmppc_core_vcpu_create_hv(struct kvm *kvm,
 
 	debugfs_vcpu_init(vcpu, id);
 
-	return vcpu;
+	return 0;
 
 uninit_vcpu:
 	kvm_vcpu_uninit(vcpu);
-free_vcpu:
-	kmem_cache_free(kvm_vcpu_cache, vcpu);
-out:
-	return ERR_PTR(err);
+	return err;
 }
 
 static int kvmhv_set_smt_mode(struct kvm *kvm, unsigned long smt_mode,
@@ -2431,7 +2422,6 @@ static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu)
 	unpin_vpa(vcpu->kvm, &vcpu->arch.vpa);
 	spin_unlock(&vcpu->arch.vpa_update_lock);
 	kvm_vcpu_uninit(vcpu);
-	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
 
 static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu)
diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index 3f6ad3f58628..1e6b83908668 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c
@@ -1708,21 +1708,16 @@ static int kvmppc_set_one_reg_pr(struct kvm_vcpu *vcpu, u64 id,
 	return r;
 }
 
-static struct kvm_vcpu *kvmppc_core_vcpu_create_pr(struct kvm *kvm,
-						   unsigned int id)
+static int kvmppc_core_vcpu_create_pr(struct kvm *kvm, struct kvm_vcpu *vcpu,
+				      unsigned int id)
 {
 	struct kvmppc_vcpu_book3s *vcpu_book3s;
-	struct kvm_vcpu *vcpu;
 	int err = -ENOMEM;
 	unsigned long p;
 
-	vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
-	if (!vcpu)
-		goto out;
-
 	vcpu_book3s = vzalloc(sizeof(struct kvmppc_vcpu_book3s));
 	if (!vcpu_book3s)
-		goto free_vcpu;
+		goto out;
 	vcpu->arch.book3s = vcpu_book3s;
 
 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
@@ -1771,7 +1766,7 @@ static struct kvm_vcpu *kvmppc_core_vcpu_create_pr(struct kvm *kvm,
 	if (err < 0)
 		goto free_shared_page;
 
-	return vcpu;
+	return 0;
 
 free_shared_page:
 	free_page((unsigned long)vcpu->arch.shared);
@@ -1783,10 +1778,8 @@ static struct kvm_vcpu *kvmppc_core_vcpu_create_pr(struct kvm *kvm,
 free_vcpu3s:
 #endif
 	vfree(vcpu_book3s);
-free_vcpu:
-	kmem_cache_free(kvm_vcpu_cache, vcpu);
 out:
-	return ERR_PTR(err);
+	return err;
 }
 
 static void kvmppc_core_vcpu_free_pr(struct kvm_vcpu *vcpu)
@@ -1799,7 +1792,6 @@ static void kvmppc_core_vcpu_free_pr(struct kvm_vcpu *vcpu)
 	kfree(vcpu->arch.shadow_vcpu);
 #endif
 	vfree(vcpu_book3s);
-	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
 
 static int kvmppc_vcpu_run_pr(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index be9a45874194..047c9f707704 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -2114,9 +2114,10 @@ int kvmppc_core_init_vm(struct kvm *kvm)
 	return kvm->arch.kvm_ops->init_vm(kvm);
 }
 
-struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
+int kvmppc_core_vcpu_create(struct kvm *kvm, struct kvm_vcpu *vcpu,
+			    unsigned int id)
 {
-	return kvm->arch.kvm_ops->vcpu_create(kvm, id);
+	return kvm->arch.kvm_ops->vcpu_create(kvm, vcpu, id);
 }
 
 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
diff --git a/arch/powerpc/kvm/e500.c b/arch/powerpc/kvm/e500.c
index 00649ca5fa9a..96d9cde3d2e3 100644
--- a/arch/powerpc/kvm/e500.c
+++ b/arch/powerpc/kvm/e500.c
@@ -433,26 +433,18 @@ static int kvmppc_set_one_reg_e500(struct kvm_vcpu *vcpu, u64 id,
 	return r;
 }
 
-static struct kvm_vcpu *kvmppc_core_vcpu_create_e500(struct kvm *kvm,
-						     unsigned int id)
+static int kvmppc_core_vcpu_create_e500(struct kvm *kvm, struct kvm_vcpu *vcpu,
+					unsigned int id)
 {
 	struct kvmppc_vcpu_e500 *vcpu_e500;
-	struct kvm_vcpu *vcpu;
 	int err;
 
-	BUILD_BUG_ON_MSG(offsetof(struct kvmppc_vcpu_e500, vcpu) != 0,
-		"struct kvm_vcpu must be at offset 0 for arch usercopy region");
+	BUILD_BUG_ON(offsetof(struct kvmppc_vcpu_e500, vcpu) != 0);
+	vcpu_e500 = to_e500(vcpu);
 
-	vcpu_e500 = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
-	if (!vcpu_e500) {
-		err = -ENOMEM;
-		goto out;
-	}
-
-	vcpu = &vcpu_e500->vcpu;
 	err = kvm_vcpu_init(vcpu, kvm, id);
 	if (err)
-		goto free_vcpu;
+		return err;
 
 	if (kvmppc_e500_id_table_alloc(vcpu_e500) == NULL) {
 		err = -ENOMEM;
@@ -477,10 +469,7 @@ static struct kvm_vcpu *kvmppc_core_vcpu_create_e500(struct kvm *kvm,
 	kvmppc_e500_id_table_free(vcpu_e500);
 uninit_vcpu:
 	kvm_vcpu_uninit(vcpu);
-free_vcpu:
-	kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
-out:
-	return ERR_PTR(err);
+	return err;
 }
 
 static void kvmppc_core_vcpu_free_e500(struct kvm_vcpu *vcpu)
@@ -491,7 +480,6 @@ static void kvmppc_core_vcpu_free_e500(struct kvm_vcpu *vcpu)
 	kvmppc_e500_tlb_uninit(vcpu_e500);
 	kvmppc_e500_id_table_free(vcpu_e500);
 	kvm_vcpu_uninit(vcpu);
-	kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
 }
 
 static int kvmppc_core_init_vm_e500(struct kvm *kvm)
diff --git a/arch/powerpc/kvm/e500mc.c b/arch/powerpc/kvm/e500mc.c
index c51f4bb086fd..aea588f73bf7 100644
--- a/arch/powerpc/kvm/e500mc.c
+++ b/arch/powerpc/kvm/e500mc.c
@@ -301,28 +301,21 @@ static int kvmppc_set_one_reg_e500mc(struct kvm_vcpu *vcpu, u64 id,
 	return r;
 }
 
-static struct kvm_vcpu *kvmppc_core_vcpu_create_e500mc(struct kvm *kvm,
-						       unsigned int id)
+static int kvmppc_core_vcpu_create_e500mc(struct kvm *kvm, struct kvm_vcpu *vcpu,
+					  unsigned int id)
 {
 	struct kvmppc_vcpu_e500 *vcpu_e500;
-	struct kvm_vcpu *vcpu;
 	int err;
 
 	BUILD_BUG_ON(offsetof(struct kvmppc_vcpu_e500, vcpu) != 0);
-
-	vcpu_e500 = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
-	if (!vcpu_e500) {
-		err = -ENOMEM;
-		goto out;
-	}
-	vcpu = &vcpu_e500->vcpu;
+	vcpu_e500 = to_e500(vcpu);
 
 	/* Invalid PIR value -- this LPID dosn't have valid state on any cpu */
 	vcpu->arch.oldpir = 0xffffffff;
 
 	err = kvm_vcpu_init(vcpu, kvm, id);
 	if (err)
-		goto free_vcpu;
+		return err;
 
 	err = kvmppc_e500_tlb_init(vcpu_e500);
 	if (err)
@@ -340,11 +333,7 @@ static struct kvm_vcpu *kvmppc_core_vcpu_create_e500mc(struct kvm *kvm,
 	kvmppc_e500_tlb_uninit(vcpu_e500);
 uninit_vcpu:
 	kvm_vcpu_uninit(vcpu);
-
-free_vcpu:
-	kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
-out:
-	return ERR_PTR(err);
+	return err;
 }
 
 static void kvmppc_core_vcpu_free_e500mc(struct kvm_vcpu *vcpu)
@@ -354,7 +343,6 @@ static void kvmppc_core_vcpu_free_e500mc(struct kvm_vcpu *vcpu)
 	free_page((unsigned long)vcpu->arch.shared);
 	kvmppc_e500_tlb_uninit(vcpu_e500);
 	kvm_vcpu_uninit(vcpu);
-	kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
 }
 
 static int kvmppc_core_init_vm_e500mc(struct kvm *kvm)
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 3a77bb643452..1d9997ad2795 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -719,12 +719,23 @@ void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 {
 	struct kvm_vcpu *vcpu;
-	vcpu = kvmppc_core_vcpu_create(kvm, id);
-	if (!IS_ERR(vcpu)) {
-		vcpu->arch.wqp = &vcpu->wq;
-		kvmppc_create_vcpu_debugfs(vcpu, id);
-	}
+	int err;
+
+	vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
+	if (!vcpu)
+		return ERR_PTR(-ENOMEM);
+
+	err = kvmppc_core_vcpu_create(kvm, vcpu, id);
+	if (err)
+		goto free_vcpu;
+
+	vcpu->arch.wqp = &vcpu->wq;
+	kvmppc_create_vcpu_debugfs(vcpu, id);
 	return vcpu;
+
+free_vcpu:
+	kmem_cache_free(kvm_vcpu_cache, vcpu);
+	return ERR_PTR(err);
 }
 
 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
@@ -754,6 +765,8 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 	}
 
 	kvmppc_core_vcpu_free(vcpu);
+
+	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
 
 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 13/45] KVM: PPC: Book3S PR: Allocate book3s and shadow vcpu after common init
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (11 preceding siblings ...)
  2019-10-22  1:58 ` [PATCH 12/45] KVM: PPC: Allocate vcpu struct in common PPC code Sean Christopherson
@ 2019-10-22  1:58 ` Sean Christopherson
  2019-10-22  1:58 ` [PATCH 14/45] KVM: PPC: e500mc: Move reset of oldpir below call to kvm_vcpu_init() Sean Christopherson
                   ` (32 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:58 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Call kvm_vcpu_init() in kvmppc_core_vcpu_create_pr() prior to allocating
the book3s and shadow_vcpu objects in preparation of moving said call to
common PPC code.  Although kvm_vcpu_init() has an arch callback, the
callback is empty for Book3S PR, i.e. barring unseen black magic, moving
the allocation has no real functional impact.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/powerpc/kvm/book3s_pr.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index 1e6b83908668..a933ba60bc7c 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c
@@ -1712,12 +1712,18 @@ static int kvmppc_core_vcpu_create_pr(struct kvm *kvm, struct kvm_vcpu *vcpu,
 				      unsigned int id)
 {
 	struct kvmppc_vcpu_book3s *vcpu_book3s;
-	int err = -ENOMEM;
 	unsigned long p;
+	int err;
+
+	err = kvm_vcpu_init(vcpu, kvm, id);
+	if (err)
+		return err;
+
+	err = -ENOMEM;
 
 	vcpu_book3s = vzalloc(sizeof(struct kvmppc_vcpu_book3s));
 	if (!vcpu_book3s)
-		goto out;
+		goto uninit_vcpu;
 	vcpu->arch.book3s = vcpu_book3s;
 
 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
@@ -1727,14 +1733,9 @@ static int kvmppc_core_vcpu_create_pr(struct kvm *kvm, struct kvm_vcpu *vcpu,
 		goto free_vcpu3s;
 #endif
 
-	err = kvm_vcpu_init(vcpu, kvm, id);
-	if (err)
-		goto free_shadow_vcpu;
-
-	err = -ENOMEM;
 	p = __get_free_page(GFP_KERNEL|__GFP_ZERO);
 	if (!p)
-		goto uninit_vcpu;
+		goto free_shadow_vcpu;
 	vcpu->arch.shared = (void *)p;
 #ifdef CONFIG_PPC_BOOK3S_64
 	/* Always start the shared struct in native endian mode */
@@ -1770,15 +1771,14 @@ static int kvmppc_core_vcpu_create_pr(struct kvm *kvm, struct kvm_vcpu *vcpu,
 
 free_shared_page:
 	free_page((unsigned long)vcpu->arch.shared);
-uninit_vcpu:
-	kvm_vcpu_uninit(vcpu);
 free_shadow_vcpu:
 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
 	kfree(vcpu->arch.shadow_vcpu);
 free_vcpu3s:
 #endif
 	vfree(vcpu_book3s);
-out:
+uninit_vcpu:
+	kvm_vcpu_uninit(vcpu);
 	return err;
 }
 
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 14/45] KVM: PPC: e500mc: Move reset of oldpir below call to kvm_vcpu_init()
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (12 preceding siblings ...)
  2019-10-22  1:58 ` [PATCH 13/45] KVM: PPC: Book3S PR: Allocate book3s and shadow vcpu after common init Sean Christopherson
@ 2019-10-22  1:58 ` Sean Christopherson
  2019-10-22  1:58 ` [PATCH 15/45] KVM: PPC: Move kvm_vcpu_init() invocation to common code Sean Christopherson
                   ` (31 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:58 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Move the initialization of oldpir so that the call to kvm_vcpu_init() is
at the top of kvmppc_core_vcpu_create_e500mc().  oldpir is only use
when loading/putting a vCPU, which currently cannot be done until after
kvm_arch_vcpu_create() completes.  Reording the call to kvm_vcpu_init()
paves the way for moving the invocation to common PPC code.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/powerpc/kvm/e500mc.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/kvm/e500mc.c b/arch/powerpc/kvm/e500mc.c
index aea588f73bf7..f2902e612150 100644
--- a/arch/powerpc/kvm/e500mc.c
+++ b/arch/powerpc/kvm/e500mc.c
@@ -310,13 +310,13 @@ static int kvmppc_core_vcpu_create_e500mc(struct kvm *kvm, struct kvm_vcpu *vcpu
 	BUILD_BUG_ON(offsetof(struct kvmppc_vcpu_e500, vcpu) != 0);
 	vcpu_e500 = to_e500(vcpu);
 
-	/* Invalid PIR value -- this LPID dosn't have valid state on any cpu */
-	vcpu->arch.oldpir = 0xffffffff;
-
 	err = kvm_vcpu_init(vcpu, kvm, id);
 	if (err)
 		return err;
 
+	/* Invalid PIR value -- this LPID dosn't have valid state on any cpu */
+	vcpu->arch.oldpir = 0xffffffff;
+
 	err = kvmppc_e500_tlb_init(vcpu_e500);
 	if (err)
 		goto uninit_vcpu;
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 15/45] KVM: PPC: Move kvm_vcpu_init() invocation to common code
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (13 preceding siblings ...)
  2019-10-22  1:58 ` [PATCH 14/45] KVM: PPC: e500mc: Move reset of oldpir below call to kvm_vcpu_init() Sean Christopherson
@ 2019-10-22  1:58 ` Sean Christopherson
  2019-10-22  1:58 ` [PATCH 16/45] KVM: MIPS: Use kvm_vcpu_cache to allocate vCPUs Sean Christopherson
                   ` (30 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:58 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Move the kvm_cpu_{un}init() calls to common PPC code as an intermediate
step towards removing kvm_cpu_{un}init() altogether.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/powerpc/include/asm/kvm_ppc.h |  3 +--
 arch/powerpc/kvm/book3s.c          |  5 ++---
 arch/powerpc/kvm/book3s_hv.c       | 17 ++++++-----------
 arch/powerpc/kvm/book3s_pr.c       | 13 +++----------
 arch/powerpc/kvm/booke.c           |  5 ++---
 arch/powerpc/kvm/e500.c            | 16 +++-------------
 arch/powerpc/kvm/e500mc.c          |  8 ++------
 arch/powerpc/kvm/powerpc.c         | 10 +++++++++-
 8 files changed, 28 insertions(+), 49 deletions(-)

diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
index a7795339df92..d84f273ea574 100644
--- a/arch/powerpc/include/asm/kvm_ppc.h
+++ b/arch/powerpc/include/asm/kvm_ppc.h
@@ -119,8 +119,7 @@ extern int kvmppc_xlate(struct kvm_vcpu *vcpu, ulong eaddr,
 			enum xlate_instdata xlid, enum xlate_readwrite xlrw,
 			struct kvmppc_pte *pte);
 
-extern int kvmppc_core_vcpu_create(struct kvm *kvm, struct kvm_vcpu *vcpu,
-				   unsigned int id);
+extern int kvmppc_core_vcpu_create(struct kvm_vcpu *vcpu);
 extern void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu);
 extern int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu);
 extern int kvmppc_core_check_processor_compat(void);
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 241ae3e114d2..fd049ede2487 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -814,10 +814,9 @@ void kvmppc_decrementer_func(struct kvm_vcpu *vcpu)
 	kvm_vcpu_kick(vcpu);
 }
 
-int kvmppc_core_vcpu_create(struct kvm *kvm, struct kvm_vcpu *vcpu,
-			    unsigned int id)
+int kvmppc_core_vcpu_create(struct kvm_vcpu *vcpu)
 {
-	return kvm->arch.kvm_ops->vcpu_create(kvm, vcpu, id);
+	return kvm->arch.kvm_ops->vcpu_create(vcpu);
 }
 
 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 103a7599c2d1..ecc0895fd76f 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -2257,16 +2257,16 @@ static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id)
 }
 #endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
 
-static int kvmppc_core_vcpu_create_hv(struct kvm *kvm, struct kvm_vcpu *vcpu,
-				      unsigned int id)
+static int kvmppc_core_vcpu_create_hv(struct kvm_vcpu *vcpu)
 {
 	int err;
 	int core;
 	struct kvmppc_vcore *vcore;
+	struct kvm *kvm;
+	unsigned int id;
 
-	err = kvm_vcpu_init(vcpu, kvm, id);
-	if (err)
-		return err;
+	kvm = vcpu->kvm;
+	id = vcpu->vcpu_id;
 
 	vcpu->arch.shared = &vcpu->arch.shregs;
 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
@@ -2348,7 +2348,7 @@ static int kvmppc_core_vcpu_create_hv(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	mutex_unlock(&kvm->lock);
 
 	if (!vcore)
-		goto uninit_vcpu;
+		return err;
 
 	spin_lock(&vcore->lock);
 	++vcore->num_threads;
@@ -2364,10 +2364,6 @@ static int kvmppc_core_vcpu_create_hv(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	debugfs_vcpu_init(vcpu, id);
 
 	return 0;
-
-uninit_vcpu:
-	kvm_vcpu_uninit(vcpu);
-	return err;
 }
 
 static int kvmhv_set_smt_mode(struct kvm *kvm, unsigned long smt_mode,
@@ -2421,7 +2417,6 @@ static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu)
 	unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow);
 	unpin_vpa(vcpu->kvm, &vcpu->arch.vpa);
 	spin_unlock(&vcpu->arch.vpa_update_lock);
-	kvm_vcpu_uninit(vcpu);
 }
 
 static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu)
diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index a933ba60bc7c..12f23f0c4ece 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c
@@ -1708,22 +1708,17 @@ static int kvmppc_set_one_reg_pr(struct kvm_vcpu *vcpu, u64 id,
 	return r;
 }
 
-static int kvmppc_core_vcpu_create_pr(struct kvm *kvm, struct kvm_vcpu *vcpu,
-				      unsigned int id)
+static int kvmppc_core_vcpu_create_pr(struct kvm_vcpu *vcpu)
 {
 	struct kvmppc_vcpu_book3s *vcpu_book3s;
 	unsigned long p;
 	int err;
 
-	err = kvm_vcpu_init(vcpu, kvm, id);
-	if (err)
-		return err;
-
 	err = -ENOMEM;
 
 	vcpu_book3s = vzalloc(sizeof(struct kvmppc_vcpu_book3s));
 	if (!vcpu_book3s)
-		goto uninit_vcpu;
+		goto out;
 	vcpu->arch.book3s = vcpu_book3s;
 
 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
@@ -1777,8 +1772,7 @@ static int kvmppc_core_vcpu_create_pr(struct kvm *kvm, struct kvm_vcpu *vcpu,
 free_vcpu3s:
 #endif
 	vfree(vcpu_book3s);
-uninit_vcpu:
-	kvm_vcpu_uninit(vcpu);
+out:
 	return err;
 }
 
@@ -1787,7 +1781,6 @@ static void kvmppc_core_vcpu_free_pr(struct kvm_vcpu *vcpu)
 	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
 
 	free_page((unsigned long)vcpu->arch.shared & PAGE_MASK);
-	kvm_vcpu_uninit(vcpu);
 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
 	kfree(vcpu->arch.shadow_vcpu);
 #endif
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 047c9f707704..dd7440e50c7a 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -2114,10 +2114,9 @@ int kvmppc_core_init_vm(struct kvm *kvm)
 	return kvm->arch.kvm_ops->init_vm(kvm);
 }
 
-int kvmppc_core_vcpu_create(struct kvm *kvm, struct kvm_vcpu *vcpu,
-			    unsigned int id)
+int kvmppc_core_vcpu_create(struct kvm_vcpu *vcpu)
 {
-	return kvm->arch.kvm_ops->vcpu_create(kvm, vcpu, id);
+	return kvm->arch.kvm_ops->vcpu_create(vcpu);
 }
 
 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
diff --git a/arch/powerpc/kvm/e500.c b/arch/powerpc/kvm/e500.c
index 96d9cde3d2e3..942bfaa2d1d0 100644
--- a/arch/powerpc/kvm/e500.c
+++ b/arch/powerpc/kvm/e500.c
@@ -433,8 +433,7 @@ static int kvmppc_set_one_reg_e500(struct kvm_vcpu *vcpu, u64 id,
 	return r;
 }
 
-static int kvmppc_core_vcpu_create_e500(struct kvm *kvm, struct kvm_vcpu *vcpu,
-					unsigned int id)
+static int kvmppc_core_vcpu_create_e500(struct kvm_vcpu *vcpu)
 {
 	struct kvmppc_vcpu_e500 *vcpu_e500;
 	int err;
@@ -442,14 +441,8 @@ static int kvmppc_core_vcpu_create_e500(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	BUILD_BUG_ON(offsetof(struct kvmppc_vcpu_e500, vcpu) != 0);
 	vcpu_e500 = to_e500(vcpu);
 
-	err = kvm_vcpu_init(vcpu, kvm, id);
-	if (err)
-		return err;
-
-	if (kvmppc_e500_id_table_alloc(vcpu_e500) == NULL) {
-		err = -ENOMEM;
-		goto uninit_vcpu;
-	}
+	if (kvmppc_e500_id_table_alloc(vcpu_e500) == NULL)
+		return -ENOMEM;
 
 	err = kvmppc_e500_tlb_init(vcpu_e500);
 	if (err)
@@ -467,8 +460,6 @@ static int kvmppc_core_vcpu_create_e500(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	kvmppc_e500_tlb_uninit(vcpu_e500);
 uninit_id:
 	kvmppc_e500_id_table_free(vcpu_e500);
-uninit_vcpu:
-	kvm_vcpu_uninit(vcpu);
 	return err;
 }
 
@@ -479,7 +470,6 @@ static void kvmppc_core_vcpu_free_e500(struct kvm_vcpu *vcpu)
 	free_page((unsigned long)vcpu->arch.shared);
 	kvmppc_e500_tlb_uninit(vcpu_e500);
 	kvmppc_e500_id_table_free(vcpu_e500);
-	kvm_vcpu_uninit(vcpu);
 }
 
 static int kvmppc_core_init_vm_e500(struct kvm *kvm)
diff --git a/arch/powerpc/kvm/e500mc.c b/arch/powerpc/kvm/e500mc.c
index f2902e612150..3b37957fbfe5 100644
--- a/arch/powerpc/kvm/e500mc.c
+++ b/arch/powerpc/kvm/e500mc.c
@@ -301,8 +301,7 @@ static int kvmppc_set_one_reg_e500mc(struct kvm_vcpu *vcpu, u64 id,
 	return r;
 }
 
-static int kvmppc_core_vcpu_create_e500mc(struct kvm *kvm, struct kvm_vcpu *vcpu,
-					  unsigned int id)
+static int kvmppc_core_vcpu_create_e500mc(struct kvm_vcpu *vcpu)
 {
 	struct kvmppc_vcpu_e500 *vcpu_e500;
 	int err;
@@ -319,7 +318,7 @@ static int kvmppc_core_vcpu_create_e500mc(struct kvm *kvm, struct kvm_vcpu *vcpu
 
 	err = kvmppc_e500_tlb_init(vcpu_e500);
 	if (err)
-		goto uninit_vcpu;
+		return err;
 
 	vcpu->arch.shared = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
 	if (!vcpu->arch.shared) {
@@ -331,8 +330,6 @@ static int kvmppc_core_vcpu_create_e500mc(struct kvm *kvm, struct kvm_vcpu *vcpu
 
 uninit_tlb:
 	kvmppc_e500_tlb_uninit(vcpu_e500);
-uninit_vcpu:
-	kvm_vcpu_uninit(vcpu);
 	return err;
 }
 
@@ -342,7 +339,6 @@ static void kvmppc_core_vcpu_free_e500mc(struct kvm_vcpu *vcpu)
 
 	free_page((unsigned long)vcpu->arch.shared);
 	kvmppc_e500_tlb_uninit(vcpu_e500);
-	kvm_vcpu_uninit(vcpu);
 }
 
 static int kvmppc_core_init_vm_e500mc(struct kvm *kvm)
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 1d9997ad2795..2bc5e9f592aa 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -725,14 +725,20 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 	if (!vcpu)
 		return ERR_PTR(-ENOMEM);
 
-	err = kvmppc_core_vcpu_create(kvm, vcpu, id);
+	err = kvm_vcpu_init(vcpu, kvm, id);
 	if (err)
 		goto free_vcpu;
 
+	err = kvmppc_core_vcpu_create(vcpu);
+	if (err)
+		goto uninit_vcpu;
+
 	vcpu->arch.wqp = &vcpu->wq;
 	kvmppc_create_vcpu_debugfs(vcpu, id);
 	return vcpu;
 
+uninit_vcpu:
+	kvm_vcpu_uninit(vcpu);
 free_vcpu:
 	kmem_cache_free(kvm_vcpu_cache, vcpu);
 	return ERR_PTR(err);
@@ -766,6 +772,8 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 
 	kvmppc_core_vcpu_free(vcpu);
 
+	kvm_vcpu_uninit(vcpu);
+
 	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
 
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 16/45] KVM: MIPS: Use kvm_vcpu_cache to allocate vCPUs
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (14 preceding siblings ...)
  2019-10-22  1:58 ` [PATCH 15/45] KVM: PPC: Move kvm_vcpu_init() invocation to common code Sean Christopherson
@ 2019-10-22  1:58 ` Sean Christopherson
  2019-10-22  1:58 ` [PATCH 17/45] KVM: MIPS: Drop kvm_arch_vcpu_free() Sean Christopherson
                   ` (29 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:58 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

For reasons unknown, MIPS configures the vCPU allocation cache but
allocates vCPUs via kzalloc().  Allocate from the vCPU cache in
preparation for moving vCPU allocation to common KVM code.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/mips/kvm/mips.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 1109924560d8..5f985773417c 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -286,7 +286,7 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 	void *gebase, *p, *handler, *refill_start, *refill_end;
 	int i;
 
-	struct kvm_vcpu *vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
+	struct kvm_vcpu *vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 
 	if (!vcpu) {
 		err = -ENOMEM;
@@ -401,7 +401,7 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 	kvm_vcpu_uninit(vcpu);
 
 out_free_cpu:
-	kfree(vcpu);
+	kmem_cache_free(kvm_vcpu_cache, vcpu);
 
 out:
 	return ERR_PTR(err);
@@ -418,7 +418,7 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 	kvm_mmu_free_memory_caches(vcpu);
 	kfree(vcpu->arch.guest_ebase);
 	kfree(vcpu->arch.kseg0_commpage);
-	kfree(vcpu);
+	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
 
 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 17/45] KVM: MIPS: Drop kvm_arch_vcpu_free()
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (15 preceding siblings ...)
  2019-10-22  1:58 ` [PATCH 16/45] KVM: MIPS: Use kvm_vcpu_cache to allocate vCPUs Sean Christopherson
@ 2019-10-22  1:58 ` Sean Christopherson
  2019-10-22  1:58 ` [PATCH 18/45] KVM: PPC: " Sean Christopherson
                   ` (28 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:58 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Remove the superfluous kvm_arch_vcpu_free() as it is no longer called
from commmon KVM code.  Note, kvm_arch_vcpu_destroy() *is* called from
common code, i.e. choosing which function to whack is not completely
arbitrary.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/mips/kvm/mips.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 5f985773417c..d72bceb10439 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -156,7 +156,7 @@ void kvm_mips_free_vcpus(struct kvm *kvm)
 	struct kvm_vcpu *vcpu;
 
 	kvm_for_each_vcpu(i, vcpu, kvm) {
-		kvm_arch_vcpu_free(vcpu);
+		kvm_arch_vcpu_destroy(vcpu);
 	}
 
 	mutex_lock(&kvm->lock);
@@ -407,7 +407,7 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 	return ERR_PTR(err);
 }
 
-void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
+void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 {
 	hrtimer_cancel(&vcpu->arch.comparecount_timer);
 
@@ -421,11 +421,6 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
 
-void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
-{
-	kvm_arch_vcpu_free(vcpu);
-}
-
 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 					struct kvm_guest_debug *dbg)
 {
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 18/45] KVM: PPC: Drop kvm_arch_vcpu_free()
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (16 preceding siblings ...)
  2019-10-22  1:58 ` [PATCH 17/45] KVM: MIPS: Drop kvm_arch_vcpu_free() Sean Christopherson
@ 2019-10-22  1:58 ` " Sean Christopherson
  2019-10-22  1:58 ` [PATCH 19/45] KVM: arm: " Sean Christopherson
                   ` (27 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:58 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Remove the superfluous kvm_arch_vcpu_free() as it is no longer called
from commmon KVM code.  Note, kvm_arch_vcpu_destroy() *is* called from
common code, i.e. choosing which function to whack is not completely
arbitrary.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/powerpc/kvm/powerpc.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 2bc5e9f592aa..2cdc443cc09b 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -473,7 +473,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
 #endif
 
 	kvm_for_each_vcpu(i, vcpu, kvm)
-		kvm_arch_vcpu_free(vcpu);
+		kvm_arch_vcpu_destroy(vcpu);
 
 	mutex_lock(&kvm->lock);
 	for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
@@ -748,7 +748,7 @@ void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 {
 }
 
-void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
+void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 {
 	/* Make sure we're not using the vcpu anymore */
 	hrtimer_cancel(&vcpu->arch.dec_timer);
@@ -777,11 +777,6 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
 
-void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
-{
-	kvm_arch_vcpu_free(vcpu);
-}
-
 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 {
 	return kvmppc_core_pending_dec(vcpu);
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 19/45] KVM: arm: Drop kvm_arch_vcpu_free()
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (17 preceding siblings ...)
  2019-10-22  1:58 ` [PATCH 18/45] KVM: PPC: " Sean Christopherson
@ 2019-10-22  1:58 ` " Sean Christopherson
  2019-10-22  1:59 ` [PATCH 20/45] KVM: x86: Remove spurious kvm_mmu_unload() from vcpu destruction path Sean Christopherson
                   ` (26 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:58 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Remove the superfluous kvm_arch_vcpu_free() as it is no longer called
from commmon KVM code.  Note, kvm_arch_vcpu_destroy() *is* called from
common code, i.e. choosing which function to whack is not completely
arbitrary.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 virt/kvm/arm/arm.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index 86c6aa1cb58e..266d78fbc86c 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -170,7 +170,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
 
 	for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 		if (kvm->vcpus[i]) {
-			kvm_arch_vcpu_free(kvm->vcpus[i]);
+			kvm_arch_vcpu_destroy(kvm->vcpus[i]);
 			kvm->vcpus[i] = NULL;
 		}
 	}
@@ -295,7 +295,7 @@ void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 {
 }
 
-void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
+void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 {
 	if (vcpu->arch.has_run_once && unlikely(!irqchip_in_kernel(vcpu->kvm)))
 		static_branch_dec(&userspace_irqchip_in_use);
@@ -307,11 +307,6 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
 
-void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
-{
-	kvm_arch_vcpu_free(vcpu);
-}
-
 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 {
 	return kvm_timer_is_pending(vcpu);
-- 
2.22.0

_______________________________________________
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kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 20/45] KVM: x86: Remove spurious kvm_mmu_unload() from vcpu destruction path
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (18 preceding siblings ...)
  2019-10-22  1:58 ` [PATCH 19/45] KVM: arm: " Sean Christopherson
@ 2019-10-22  1:59 ` Sean Christopherson
  2019-10-22  1:59 ` [PATCH 21/45] KVM: x86: Remove spurious clearing of async #PF MSR Sean Christopherson
                   ` (25 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

x86 does not load its MMU until KVM_RUN, which cannot be invoked until
after vCPU creation succeeds.  Given that kvm_arch_vcpu_destroy() is
called if and only if vCPU creation fails, it is impossible for the MMU
to be loaded.

Note, the bogus kvm_mmu_unload() call was added during an unrelated
refactoring of vCPU allocation, i.e. was presumably added as an
opportunstic "fix" for a perceived leak.

Fixes: fb3f0f51d92d1 ("KVM: Dynamically allocate vcpus")
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/x86.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 3a6d8c4a9758..dd667df37d63 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9099,10 +9099,6 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 {
 	vcpu->arch.apf.msr_val = 0;
 
-	vcpu_load(vcpu);
-	kvm_mmu_unload(vcpu);
-	vcpu_put(vcpu);
-
 	kvm_arch_vcpu_free(vcpu);
 }
 
-- 
2.22.0

_______________________________________________
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kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 21/45] KVM: x86: Remove spurious clearing of async #PF MSR
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (19 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 20/45] KVM: x86: Remove spurious kvm_mmu_unload() from vcpu destruction path Sean Christopherson
@ 2019-10-22  1:59 ` Sean Christopherson
  2019-10-22  1:59 ` [PATCH 22/45] KVM: x86: Drop kvm_arch_vcpu_free() Sean Christopherson
                   ` (24 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Remove a bogus clearing of apf.msr_val from kvm_arch_vcpu_destroy().

apf.msr_val is only set to a non-zero value by kvm_pv_enable_async_pf(),
which is only reachable by kvm_set_msr_common(), i.e. by writing
MSR_KVM_ASYNC_PF_EN.  KVM does not autonomously write said MSR, i.e.
can only be written via KVM_SET_MSRS or KVM_RUN.  Since KVM_SET_MSRS and
KVM_RUN are vcpu ioctls, they require a valid vcpu file descriptor.
kvm_arch_vcpu_destroy() is only called if KVM_CREATE_VCPU fails, and KVM
declares KVM_CREATE_VCPU successful once the vcpu fd is installed and
thus visible to userspace.  Ergo, apf.msr_val cannot be non-zero when
kvm_arch_vcpu_destroy() is called.

Fixes: 344d9588a9df0 ("KVM: Add PV MSR to enable asynchronous page faults delivery.")
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/x86.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index dd667df37d63..dfd5c5244a6b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9097,8 +9097,6 @@ void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 
 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 {
-	vcpu->arch.apf.msr_val = 0;
-
 	kvm_arch_vcpu_free(vcpu);
 }
 
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 22/45] KVM: x86: Drop kvm_arch_vcpu_free()
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (20 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 21/45] KVM: x86: Remove spurious clearing of async #PF MSR Sean Christopherson
@ 2019-10-22  1:59 ` Sean Christopherson
  2019-10-22  1:59 ` [PATCH 23/45] KVM: Remove kvm_arch_vcpu_free() declaration Sean Christopherson
                   ` (23 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Remove the superfluous kvm_arch_vcpu_free() as it is no longer called
from commmon KVM code.  Note, kvm_arch_vcpu_destroy() *is* called from
common code, i.e. choosing which function to whack is not completely
arbitrary.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/x86.c | 27 +++++++++++----------------
 1 file changed, 11 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index dfd5c5244a6b..10ee982b214d 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9010,20 +9010,6 @@ static void fx_init(struct kvm_vcpu *vcpu)
 	vcpu->arch.cr0 |= X86_CR0_ET;
 }
 
-void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
-{
-	kvmclock_reset(vcpu);
-
-	kvm_x86_ops->vcpu_free(vcpu);
-
-	kvm_vcpu_uninit(vcpu);
-
-	free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
-	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
-	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
-	kmem_cache_free(kvm_vcpu_cache, vcpu);
-}
-
 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
 						unsigned int id)
 {
@@ -9097,7 +9083,16 @@ void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 
 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 {
-	kvm_arch_vcpu_free(vcpu);
+	kvmclock_reset(vcpu);
+
+	kvm_x86_ops->vcpu_free(vcpu);
+
+	kvm_vcpu_uninit(vcpu);
+
+	free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
+	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
+	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
+	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
 
 void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
@@ -9497,7 +9492,7 @@ static void kvm_free_vcpus(struct kvm *kvm)
 		kvm_unload_vcpu_mmu(vcpu);
 	}
 	kvm_for_each_vcpu(i, vcpu, kvm)
-		kvm_arch_vcpu_free(vcpu);
+		kvm_arch_vcpu_destroy(vcpu);
 
 	mutex_lock(&kvm->lock);
 	for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 23/45] KVM: Remove kvm_arch_vcpu_free() declaration
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (21 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 22/45] KVM: x86: Drop kvm_arch_vcpu_free() Sean Christopherson
@ 2019-10-22  1:59 ` Sean Christopherson
  2019-10-22  1:59 ` [PATCH 24/45] KVM: Add kvm_arch_vcpu_precreate() to handle pre-allocation issues Sean Christopherson
                   ` (22 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Remove KVM's declaration of kvm_arch_vcpu_free() now that the function
is gone from all architectures (several architectures were relying on
the forward declaration).

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 include/linux/kvm_host.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 719fc3e15ea4..ff31470aabd3 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -853,7 +853,6 @@ void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
 
 void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu);
 
-void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id);
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 24/45] KVM: Add kvm_arch_vcpu_precreate() to handle pre-allocation issues
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (22 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 23/45] KVM: Remove kvm_arch_vcpu_free() declaration Sean Christopherson
@ 2019-10-22  1:59 ` Sean Christopherson
  2019-10-22  1:59 ` [PATCH 25/45] KVM: s390: Move guts of kvm_arch_vcpu_init() into kvm_arch_vcpu_create() Sean Christopherson
                   ` (21 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Add a pre-allocation arch hook to handle checks that are currently done
by arch specific code prior to allocating the vCPU object.  This paves
the way for moving the allocation to common KVM code.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/mips/kvm/mips.c       |  5 +++++
 arch/powerpc/kvm/powerpc.c |  5 +++++
 arch/s390/kvm/kvm-s390.c   | 12 ++++++++----
 arch/x86/kvm/x86.c         | 14 +++++++++-----
 include/linux/kvm_host.h   |  1 +
 virt/kvm/arm/arm.c         | 21 +++++++++++----------
 virt/kvm/kvm_main.c        |  4 ++++
 7 files changed, 43 insertions(+), 19 deletions(-)

diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index d72bceb10439..2e14455aec4e 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -280,6 +280,11 @@ static inline void dump_handler(const char *symbol, void *start, void *end)
 	pr_debug("\tEND(%s)\n", symbol);
 }
 
+int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
+{
+	return 0;
+}
+
 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 {
 	int err, size;
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 2cdc443cc09b..fa9ed239c546 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -716,6 +716,11 @@ void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
 	kvmppc_core_flush_memslot(kvm, slot);
 }
 
+int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
+{
+	return 0;
+}
+
 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 {
 	struct kvm_vcpu *vcpu;
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index d047e846e1b9..ddc90fa6abfd 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -3038,15 +3038,19 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
 	return rc;
 }
 
+int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
+{
+	if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id))
+		return -EINVAL;
+	return 0;
+}
+
 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
 				      unsigned int id)
 {
 	struct kvm_vcpu *vcpu;
 	struct sie_page *sie_page;
-	int rc = -EINVAL;
-
-	if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id))
-		goto out;
+	int rc;
 
 	rc = -ENOMEM;
 
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 10ee982b214d..964b3d0c7bc6 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9010,17 +9010,21 @@ static void fx_init(struct kvm_vcpu *vcpu)
 	vcpu->arch.cr0 |= X86_CR0_ET;
 }
 
+int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
+{
+	if (kvm_check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0)
+		pr_warn_once("kvm: SMP vm created on host with unstable TSC; "
+			     "guest TSC will not be reliable\n");
+
+	return 0;
+}
+
 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
 						unsigned int id)
 {
 	struct kvm_vcpu *vcpu;
 	int r;
 
-	if (kvm_check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0)
-		printk_once(KERN_WARNING
-		"kvm: SMP vm created on host with unstable TSC; "
-		"guest TSC will not be reliable\n");
-
 	vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL_ACCOUNT);
 	if (!vcpu)
 		return ERR_PTR(-ENOMEM);
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index ff31470aabd3..8bc03884cf5c 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -855,6 +855,7 @@ void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu);
 
 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
+int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id);
 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id);
 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu);
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index 266d78fbc86c..03f6eec1841c 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -253,21 +253,22 @@ void kvm_arch_free_vm(struct kvm *kvm)
 		vfree(kvm);
 }
 
+int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
+{
+	if (irqchip_in_kernel(kvm) && vgic_initialized(kvm))
+		return -EBUSY;
+
+	if (id >= kvm->arch.max_vcpus)
+		return -EINVAL;
+
+	return 0;
+}
+
 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 {
 	int err;
 	struct kvm_vcpu *vcpu;
 
-	if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) {
-		err = -EBUSY;
-		goto out;
-	}
-
-	if (id >= kvm->arch.max_vcpus) {
-		err = -EINVAL;
-		goto out;
-	}
-
 	vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 	if (!vcpu) {
 		err = -ENOMEM;
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 67ef3f2e19e8..9c6791ad71e5 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2653,6 +2653,10 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
 	kvm->created_vcpus++;
 	mutex_unlock(&kvm->lock);
 
+	r = kvm_arch_vcpu_precreate(kvm, id);
+	if (r)
+		goto vcpu_decrement;
+
 	vcpu = kvm_arch_vcpu_create(kvm, id);
 	if (IS_ERR(vcpu)) {
 		r = PTR_ERR(vcpu);
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 25/45] KVM: s390: Move guts of kvm_arch_vcpu_init() into kvm_arch_vcpu_create()
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (23 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 24/45] KVM: Add kvm_arch_vcpu_precreate() to handle pre-allocation issues Sean Christopherson
@ 2019-10-22  1:59 ` Sean Christopherson
  2019-10-22  1:59 ` [PATCH 26/45] KVM: s390: Invoke kvm_vcpu_init() before allocating sie_page Sean Christopherson
                   ` (20 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Move all of kvm_arch_vcpu_init(), which is invoked at the very end of
kvm_vcpu_init(), into kvm_arch_vcpu_create() in preparation of moving
the call to kvm_vcpu_init().  Moving kvm_vcpu_init() is itself a
preparatory step for moving allocation and initialization to common KVM
code.

No functional change inteded.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/s390/kvm/kvm-s390.c | 62 ++++++++++++++++++++++------------------
 1 file changed, 34 insertions(+), 28 deletions(-)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index ddc90fa6abfd..43be136682bb 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2708,34 +2708,6 @@ static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id)
 
 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 {
-	vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
-	kvm_clear_async_pf_completion_queue(vcpu);
-	vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
-				    KVM_SYNC_GPRS |
-				    KVM_SYNC_ACRS |
-				    KVM_SYNC_CRS |
-				    KVM_SYNC_ARCH0 |
-				    KVM_SYNC_PFAULT;
-	kvm_s390_set_prefix(vcpu, 0);
-	if (test_kvm_facility(vcpu->kvm, 64))
-		vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB;
-	if (test_kvm_facility(vcpu->kvm, 82))
-		vcpu->run->kvm_valid_regs |= KVM_SYNC_BPBC;
-	if (test_kvm_facility(vcpu->kvm, 133))
-		vcpu->run->kvm_valid_regs |= KVM_SYNC_GSCB;
-	if (test_kvm_facility(vcpu->kvm, 156))
-		vcpu->run->kvm_valid_regs |= KVM_SYNC_ETOKEN;
-	/* fprs can be synchronized via vrs, even if the guest has no vx. With
-	 * MACHINE_HAS_VX, (load|store)_fpu_regs() will work with vrs format.
-	 */
-	if (MACHINE_HAS_VX)
-		vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS;
-	else
-		vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS;
-
-	if (kvm_is_ucontrol(vcpu->kvm))
-		return __kvm_ucontrol_vcpu_init(vcpu);
-
 	return 0;
 }
 
@@ -3080,11 +3052,45 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
 	rc = kvm_vcpu_init(vcpu, kvm, id);
 	if (rc)
 		goto out_free_sie_block;
+
+	vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
+	kvm_clear_async_pf_completion_queue(vcpu);
+	vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
+				    KVM_SYNC_GPRS |
+				    KVM_SYNC_ACRS |
+				    KVM_SYNC_CRS |
+				    KVM_SYNC_ARCH0 |
+				    KVM_SYNC_PFAULT;
+	kvm_s390_set_prefix(vcpu, 0);
+	if (test_kvm_facility(vcpu->kvm, 64))
+		vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB;
+	if (test_kvm_facility(vcpu->kvm, 82))
+		vcpu->run->kvm_valid_regs |= KVM_SYNC_BPBC;
+	if (test_kvm_facility(vcpu->kvm, 133))
+		vcpu->run->kvm_valid_regs |= KVM_SYNC_GSCB;
+	if (test_kvm_facility(vcpu->kvm, 156))
+		vcpu->run->kvm_valid_regs |= KVM_SYNC_ETOKEN;
+	/* fprs can be synchronized via vrs, even if the guest has no vx. With
+	 * MACHINE_HAS_VX, (load|store)_fpu_regs() will work with vrs format.
+	 */
+	if (MACHINE_HAS_VX)
+		vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS;
+	else
+		vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS;
+
+	if (kvm_is_ucontrol(vcpu->kvm)) {
+		rc = __kvm_ucontrol_vcpu_init(vcpu);
+		if (rc)
+			goto out_uninit_vcpu;
+	}
+
 	VM_EVENT(kvm, 3, "create cpu %d at 0x%pK, sie block at 0x%pK", id, vcpu,
 		 vcpu->arch.sie_block);
 	trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block);
 
 	return vcpu;
+out_uninit_vcpu:
+	kvm_vcpu_uninit(vcpu);
 out_free_sie_block:
 	free_page((unsigned long)(vcpu->arch.sie_block));
 out_free_cpu:
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 26/45] KVM: s390: Invoke kvm_vcpu_init() before allocating sie_page
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (24 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 25/45] KVM: s390: Move guts of kvm_arch_vcpu_init() into kvm_arch_vcpu_create() Sean Christopherson
@ 2019-10-22  1:59 ` Sean Christopherson
  2019-10-22  1:59 ` [PATCH 27/45] KVM: MIPS: Invoke kvm_vcpu_uninit() immediately prior to freeing vcpu Sean Christopherson
                   ` (19 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Now that s390's implementation of kvm_arch_vcpu_init() is empty, move
the call to kvm_vcpu_init() above the allocation of the sie_page.  This
paves the way for moving vcpu allocation and initialization into common
KVM code without any associated functional change.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/s390/kvm/kvm-s390.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 43be136682bb..9289ed10561b 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -3030,10 +3030,16 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
 	if (!vcpu)
 		goto out;
 
+	rc = kvm_vcpu_init(vcpu, kvm, id);
+	if (rc)
+		goto out_free_cpu;
+
+	rc = -ENOMEM;
+
 	BUILD_BUG_ON(sizeof(struct sie_page) != 4096);
 	sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL);
 	if (!sie_page)
-		goto out_free_cpu;
+		goto out_uninit_vcpu;
 
 	vcpu->arch.sie_block = &sie_page->sie_block;
 	vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb;
@@ -3049,10 +3055,6 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
 		vcpu->arch.sie_block->gd |= GISA_FORMAT1;
 	seqcount_init(&vcpu->arch.cputm_seqcount);
 
-	rc = kvm_vcpu_init(vcpu, kvm, id);
-	if (rc)
-		goto out_free_sie_block;
-
 	vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
 	kvm_clear_async_pf_completion_queue(vcpu);
 	vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
@@ -3081,7 +3083,7 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
 	if (kvm_is_ucontrol(vcpu->kvm)) {
 		rc = __kvm_ucontrol_vcpu_init(vcpu);
 		if (rc)
-			goto out_uninit_vcpu;
+			goto out_free_sie_block;
 	}
 
 	VM_EVENT(kvm, 3, "create cpu %d at 0x%pK, sie block at 0x%pK", id, vcpu,
@@ -3089,10 +3091,10 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
 	trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block);
 
 	return vcpu;
-out_uninit_vcpu:
-	kvm_vcpu_uninit(vcpu);
 out_free_sie_block:
 	free_page((unsigned long)(vcpu->arch.sie_block));
+out_uninit_vcpu:
+	kvm_vcpu_uninit(vcpu);
 out_free_cpu:
 	kmem_cache_free(kvm_vcpu_cache, vcpu);
 out:
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 27/45] KVM: MIPS: Invoke kvm_vcpu_uninit() immediately prior to freeing vcpu
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (25 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 26/45] KVM: s390: Invoke kvm_vcpu_init() before allocating sie_page Sean Christopherson
@ 2019-10-22  1:59 ` Sean Christopherson
  2019-10-22  1:59 ` [PATCH 28/45] KVM: x86: " Sean Christopherson
                   ` (18 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Move the call to kvm_vcpu_uninit() in kvm_arch_vcpu_destroy() down a few
lines so that it is invoked immediately prior to freeing the vCPU.  This
paves the way for moving the uninit and free sequence to common KVM code
without an associated functional change.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/mips/kvm/mips.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 2e14455aec4e..73360e021259 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -416,13 +416,13 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 {
 	hrtimer_cancel(&vcpu->arch.comparecount_timer);
 
-	kvm_vcpu_uninit(vcpu);
-
 	kvm_mips_dump_stats(vcpu);
 
 	kvm_mmu_free_memory_caches(vcpu);
 	kfree(vcpu->arch.guest_ebase);
 	kfree(vcpu->arch.kseg0_commpage);
+
+	kvm_vcpu_uninit(vcpu);
 	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
 
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 28/45] KVM: x86: Invoke kvm_vcpu_uninit() immediately prior to freeing vcpu
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (26 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 27/45] KVM: MIPS: Invoke kvm_vcpu_uninit() immediately prior to freeing vcpu Sean Christopherson
@ 2019-10-22  1:59 ` " Sean Christopherson
  2019-10-22  1:59 ` [PATCH 29/45] KVM: Introduce kvm_vcpu_destroy() Sean Christopherson
                   ` (17 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Move the call to kvm_vcpu_uninit() in kvm_arch_vcpu_destroy() down a few
lines so that it is invoked immediately prior to freeing the vCPU.  This
paves the way for moving the uninit and free sequence to common KVM code
without an associated functional change.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/x86.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 964b3d0c7bc6..9fdfc20f0cc2 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9091,11 +9091,11 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 
 	kvm_x86_ops->vcpu_free(vcpu);
 
-	kvm_vcpu_uninit(vcpu);
-
 	free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
 	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
 	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
+
+	kvm_vcpu_uninit(vcpu);
 	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
 
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 29/45] KVM: Introduce kvm_vcpu_destroy()
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (27 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 28/45] KVM: x86: " Sean Christopherson
@ 2019-10-22  1:59 ` Sean Christopherson
  2019-10-22  1:59 ` [PATCH 30/45] KVM: Move vcpu alloc and init invocation to common code Sean Christopherson
                   ` (16 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Add kvm_vcpu_destroy() and wire up all architectures to call the common
function instead of their arch specific implementation.  The common
destruction function will be used by future patches to move allocation
and initialization of vCPUs to common KVM code, i.e. to free resources
that are allocated by arch agnostic code.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/mips/kvm/mips.c       | 2 +-
 arch/powerpc/kvm/powerpc.c | 2 +-
 arch/s390/kvm/kvm-s390.c   | 2 +-
 arch/x86/kvm/x86.c         | 2 +-
 include/linux/kvm_host.h   | 1 +
 virt/kvm/arm/arm.c         | 2 +-
 virt/kvm/kvm_main.c        | 6 ++++++
 7 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 73360e021259..8546bc6e09e7 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -156,7 +156,7 @@ void kvm_mips_free_vcpus(struct kvm *kvm)
 	struct kvm_vcpu *vcpu;
 
 	kvm_for_each_vcpu(i, vcpu, kvm) {
-		kvm_arch_vcpu_destroy(vcpu);
+		kvm_vcpu_destroy(vcpu);
 	}
 
 	mutex_lock(&kvm->lock);
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index fa9ed239c546..69a1a1c36909 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -473,7 +473,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
 #endif
 
 	kvm_for_each_vcpu(i, vcpu, kvm)
-		kvm_arch_vcpu_destroy(vcpu);
+		kvm_vcpu_destroy(vcpu);
 
 	mutex_lock(&kvm->lock);
 	for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 9289ed10561b..2c965f11c276 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2544,7 +2544,7 @@ static void kvm_free_vcpus(struct kvm *kvm)
 	struct kvm_vcpu *vcpu;
 
 	kvm_for_each_vcpu(i, vcpu, kvm)
-		kvm_arch_vcpu_destroy(vcpu);
+		kvm_vcpu_destroy(vcpu);
 
 	mutex_lock(&kvm->lock);
 	for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 9fdfc20f0cc2..c72b104deaca 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9496,7 +9496,7 @@ static void kvm_free_vcpus(struct kvm *kvm)
 		kvm_unload_vcpu_mmu(vcpu);
 	}
 	kvm_for_each_vcpu(i, vcpu, kvm)
-		kvm_arch_vcpu_destroy(vcpu);
+		kvm_vcpu_destroy(vcpu);
 
 	mutex_lock(&kvm->lock);
 	for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 8bc03884cf5c..f38d75f60c8c 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -587,6 +587,7 @@ static inline int kvm_vcpu_get_idx(struct kvm_vcpu *vcpu)
 
 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
+void kvm_vcpu_destroy(struct kvm_vcpu *vcpu);
 
 void vcpu_load(struct kvm_vcpu *vcpu);
 void vcpu_put(struct kvm_vcpu *vcpu);
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index 03f6eec1841c..deb8a540538f 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -170,7 +170,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
 
 	for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 		if (kvm->vcpus[i]) {
-			kvm_arch_vcpu_destroy(kvm->vcpus[i]);
+			kvm_vcpu_destroy(kvm->vcpus[i]);
 			kvm->vcpus[i] = NULL;
 		}
 	}
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 9c6791ad71e5..dc6c721348dd 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -341,6 +341,12 @@ void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
 }
 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
 
+void kvm_vcpu_destroy(struct kvm_vcpu *vcpu)
+{
+	kvm_arch_vcpu_destroy(vcpu);
+}
+EXPORT_SYMBOL_GPL(kvm_vcpu_destroy);
+
 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
 {
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 30/45] KVM: Move vcpu alloc and init invocation to common code
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (28 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 29/45] KVM: Introduce kvm_vcpu_destroy() Sean Christopherson
@ 2019-10-22  1:59 ` Sean Christopherson
  2019-10-22  1:59 ` [PATCH 31/45] KVM: Unexport kvm_vcpu_cache and kvm_{un}init_vcpu() Sean Christopherson
                   ` (15 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Now that all architectures tightly couple vcpu allocation/free with the
mandatory calls to kvm_{un}init_vcpu(), move the sequences verbatim to
common KVM code.

Move both allocation and initialization in a single patch to eliminate
thrash in arch specific code.  The bisection benefits of moving the two
pieces in separate patches is marginal at best, whereas the odds of
introducing a transient arch specific bug are non-zero.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/mips/kvm/mips.c       | 33 ++++++---------------------------
 arch/powerpc/kvm/powerpc.c | 27 ++++-----------------------
 arch/s390/kvm/kvm-s390.c   | 31 +++++--------------------------
 arch/x86/kvm/x86.c         | 28 ++--------------------------
 include/linux/kvm_host.h   |  2 +-
 virt/kvm/arm/arm.c         | 29 ++---------------------------
 virt/kvm/kvm_main.c        | 21 ++++++++++++++++++---
 7 files changed, 38 insertions(+), 133 deletions(-)

diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 8546bc6e09e7..92c9321b3f95 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -285,25 +285,14 @@ int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
 	return 0;
 }
 
-struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
+int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 {
 	int err, size;
 	void *gebase, *p, *handler, *refill_start, *refill_end;
 	int i;
 
-	struct kvm_vcpu *vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
-
-	if (!vcpu) {
-		err = -ENOMEM;
-		goto out;
-	}
-
-	err = kvm_vcpu_init(vcpu, kvm, id);
-
-	if (err)
-		goto out_free_cpu;
-
-	kvm_debug("kvm @ %p: create cpu %d at %p\n", kvm, id, vcpu);
+	kvm_debug("kvm @ %p: create cpu %d at %p\n",
+		  vcpu->kvm, vcpu->vcpu_id, vcpu);
 
 	/*
 	 * Allocate space for host mode exception handlers that handle
@@ -318,7 +307,7 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 
 	if (!gebase) {
 		err = -ENOMEM;
-		goto out_uninit_cpu;
+		goto out;
 	}
 	kvm_debug("Allocated %d bytes for KVM Exception Handlers @ %p\n",
 		  ALIGN(size, PAGE_SIZE), gebase);
@@ -397,19 +386,12 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 	vcpu->arch.last_sched_cpu = -1;
 	vcpu->arch.last_exec_cpu = -1;
 
-	return vcpu;
+	return 0;
 
 out_free_gebase:
 	kfree(gebase);
-
-out_uninit_cpu:
-	kvm_vcpu_uninit(vcpu);
-
-out_free_cpu:
-	kmem_cache_free(kvm_vcpu_cache, vcpu);
-
 out:
-	return ERR_PTR(err);
+	return err;
 }
 
 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
@@ -421,9 +403,6 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 	kvm_mmu_free_memory_caches(vcpu);
 	kfree(vcpu->arch.guest_ebase);
 	kfree(vcpu->arch.kseg0_commpage);
-
-	kvm_vcpu_uninit(vcpu);
-	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
 
 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 69a1a1c36909..b14e1314f020 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -721,32 +721,17 @@ int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
 	return 0;
 }
 
-struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
+int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 {
-	struct kvm_vcpu *vcpu;
 	int err;
 
-	vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
-	if (!vcpu)
-		return ERR_PTR(-ENOMEM);
-
-	err = kvm_vcpu_init(vcpu, kvm, id);
-	if (err)
-		goto free_vcpu;
-
 	err = kvmppc_core_vcpu_create(vcpu);
 	if (err)
-		goto uninit_vcpu;
+		return err;
 
 	vcpu->arch.wqp = &vcpu->wq;
-	kvmppc_create_vcpu_debugfs(vcpu, id);
-	return vcpu;
-
-uninit_vcpu:
-	kvm_vcpu_uninit(vcpu);
-free_vcpu:
-	kmem_cache_free(kvm_vcpu_cache, vcpu);
-	return ERR_PTR(err);
+	kvmppc_create_vcpu_debugfs(vcpu, vcpu->vcpu_id);
+	return 0;
 }
 
 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
@@ -776,10 +761,6 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 	}
 
 	kvmppc_core_vcpu_free(vcpu);
-
-	kvm_vcpu_uninit(vcpu);
-
-	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
 
 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 2c965f11c276..1e4f3b9ad031 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2533,9 +2533,6 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 	if (vcpu->kvm->arch.use_cmma)
 		kvm_s390_vcpu_unsetup_cmma(vcpu);
 	free_page((unsigned long)(vcpu->arch.sie_block));
-
-	kvm_vcpu_uninit(vcpu);
-	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
 
 static void kvm_free_vcpus(struct kvm *kvm)
@@ -3017,29 +3014,15 @@ int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
 	return 0;
 }
 
-struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
-				      unsigned int id)
+int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 {
-	struct kvm_vcpu *vcpu;
 	struct sie_page *sie_page;
 	int rc;
 
-	rc = -ENOMEM;
-
-	vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
-	if (!vcpu)
-		goto out;
-
-	rc = kvm_vcpu_init(vcpu, kvm, id);
-	if (rc)
-		goto out_free_cpu;
-
-	rc = -ENOMEM;
-
 	BUILD_BUG_ON(sizeof(struct sie_page) != 4096);
 	sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL);
 	if (!sie_page)
-		goto out_uninit_vcpu;
+		return -ENOMEM;
 
 	vcpu->arch.sie_block = &sie_page->sie_block;
 	vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb;
@@ -3090,15 +3073,11 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
 		 vcpu->arch.sie_block);
 	trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block);
 
-	return vcpu;
+	return 0;
+
 out_free_sie_block:
 	free_page((unsigned long)(vcpu->arch.sie_block));
-out_uninit_vcpu:
-	kvm_vcpu_uninit(vcpu);
-out_free_cpu:
-	kmem_cache_free(kvm_vcpu_cache, vcpu);
-out:
-	return ERR_PTR(rc);
+	return rc;
 }
 
 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c72b104deaca..4d0cc3c9432f 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9019,30 +9019,9 @@ int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
 	return 0;
 }
 
-struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
-						unsigned int id)
+int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 {
-	struct kvm_vcpu *vcpu;
-	int r;
-
-	vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL_ACCOUNT);
-	if (!vcpu)
-		return ERR_PTR(-ENOMEM);
-
-	r = kvm_vcpu_init(vcpu, kvm, id);
-	if (r)
-		goto free_vcpu;
-
-	r = kvm_x86_ops->vcpu_create(vcpu);
-	if (r)
-		goto uninit_vcpu;
-	return vcpu;
-
-uninit_vcpu:
-	kvm_vcpu_uninit(vcpu);
-free_vcpu:
-	kmem_cache_free(kvm_vcpu_cache, vcpu);
-	return ERR_PTR(r);
+	return kvm_x86_ops->vcpu_create(vcpu);
 }
 
 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
@@ -9094,9 +9073,6 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 	free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
 	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
 	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
-
-	kvm_vcpu_uninit(vcpu);
-	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
 
 void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index f38d75f60c8c..8559d0448d0b 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -857,7 +857,7 @@ void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu);
 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
 int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id);
-struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id);
+int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu);
 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu);
 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index deb8a540538f..1ab151d43fd7 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -264,32 +264,9 @@ int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
 	return 0;
 }
 
-struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
+int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 {
-	int err;
-	struct kvm_vcpu *vcpu;
-
-	vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
-	if (!vcpu) {
-		err = -ENOMEM;
-		goto out;
-	}
-
-	err = kvm_vcpu_init(vcpu, kvm, id);
-	if (err)
-		goto free_vcpu;
-
-	err = create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP);
-	if (err)
-		goto vcpu_uninit;
-
-	return vcpu;
-vcpu_uninit:
-	kvm_vcpu_uninit(vcpu);
-free_vcpu:
-	kmem_cache_free(kvm_vcpu_cache, vcpu);
-out:
-	return ERR_PTR(err);
+	return create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP);
 }
 
 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
@@ -304,8 +281,6 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 	kvm_mmu_free_memory_caches(vcpu);
 	kvm_timer_vcpu_terminate(vcpu);
 	kvm_pmu_vcpu_destroy(vcpu);
-	kvm_vcpu_uninit(vcpu);
-	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
 
 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index dc6c721348dd..fb526bd55664 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -344,6 +344,9 @@ EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
 void kvm_vcpu_destroy(struct kvm_vcpu *vcpu)
 {
 	kvm_arch_vcpu_destroy(vcpu);
+
+	kvm_vcpu_uninit(vcpu);
+	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
 EXPORT_SYMBOL_GPL(kvm_vcpu_destroy);
 
@@ -2663,12 +2666,20 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
 	if (r)
 		goto vcpu_decrement;
 
-	vcpu = kvm_arch_vcpu_create(kvm, id);
-	if (IS_ERR(vcpu)) {
-		r = PTR_ERR(vcpu);
+	vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
+	if (!vcpu) {
+		r = -ENOMEM;
 		goto vcpu_decrement;
 	}
 
+	r = kvm_vcpu_init(vcpu, kvm, id);
+	if (r)
+		goto vcpu_free;
+
+	r = kvm_arch_vcpu_create(vcpu);
+	if (r)
+		goto vcpu_uninit;
+
 	preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
 
 	r = kvm_arch_vcpu_setup(vcpu);
@@ -2711,6 +2722,10 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
 	debugfs_remove_recursive(vcpu->debugfs_dentry);
 vcpu_destroy:
 	kvm_arch_vcpu_destroy(vcpu);
+vcpu_uninit:
+	kvm_vcpu_uninit(vcpu);
+vcpu_free:
+	kmem_cache_free(kvm_vcpu_cache, vcpu);
 vcpu_decrement:
 	mutex_lock(&kvm->lock);
 	kvm->created_vcpus--;
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 31/45] KVM: Unexport kvm_vcpu_cache and kvm_{un}init_vcpu()
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (29 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 30/45] KVM: Move vcpu alloc and init invocation to common code Sean Christopherson
@ 2019-10-22  1:59 ` Sean Christopherson
  2019-10-22  1:59 ` [PATCH 32/45] KVM: Move initialization of preempt notifier to kvm_vcpu_init() Sean Christopherson
                   ` (14 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Unexport kvm_vcpu_cache and kvm_{un}init_vcpu() and make them static
now that they are referenced only in kvm_main.c.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 include/linux/kvm_host.h | 4 ----
 virt/kvm/kvm_main.c      | 9 +++------
 2 files changed, 3 insertions(+), 10 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 8559d0448d0b..c36379824408 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -157,8 +157,6 @@ static inline bool is_error_page(struct page *page)
 #define KVM_USERSPACE_IRQ_SOURCE_ID		0
 #define KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID	1
 
-extern struct kmem_cache *kvm_vcpu_cache;
-
 extern struct mutex kvm_lock;
 extern struct list_head vm_list;
 
@@ -585,8 +583,6 @@ static inline int kvm_vcpu_get_idx(struct kvm_vcpu *vcpu)
 	      memslot < slots->memslots + KVM_MEM_SLOTS_NUM && memslot->npages;\
 		memslot++)
 
-int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
-void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
 void kvm_vcpu_destroy(struct kvm_vcpu *vcpu);
 
 void vcpu_load(struct kvm_vcpu *vcpu);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index fb526bd55664..1d84ae0e3893 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -103,8 +103,7 @@ static cpumask_var_t cpus_hardware_enabled;
 static int kvm_usage_count;
 static atomic_t hardware_enable_failed;
 
-struct kmem_cache *kvm_vcpu_cache;
-EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
+static struct kmem_cache *kvm_vcpu_cache;
 
 static __read_mostly struct preempt_ops kvm_preempt_ops;
 
@@ -288,7 +287,7 @@ void kvm_reload_remote_mmus(struct kvm *kvm)
 	kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
 }
 
-int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
+static int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 {
 	struct page *page;
 	int r;
@@ -326,9 +325,8 @@ int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 fail:
 	return r;
 }
-EXPORT_SYMBOL_GPL(kvm_vcpu_init);
 
-void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
+static void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
 {
 	/*
 	 * no need for rcu_read_lock as VCPU_RUN is the only place that
@@ -339,7 +337,6 @@ void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
 	kvm_arch_vcpu_uninit(vcpu);
 	free_page((unsigned long)vcpu->run);
 }
-EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
 
 void kvm_vcpu_destroy(struct kvm_vcpu *vcpu)
 {
-- 
2.22.0

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kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 32/45] KVM: Move initialization of preempt notifier to kvm_vcpu_init()
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (30 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 31/45] KVM: Unexport kvm_vcpu_cache and kvm_{un}init_vcpu() Sean Christopherson
@ 2019-10-22  1:59 ` Sean Christopherson
  2019-10-22  1:59 ` [PATCH 33/45] KVM: x86: Move guts of kvm_arch_vcpu_setup() into kvm_arch_vcpu_create() Sean Christopherson
                   ` (13 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Initialize the preempt notifier immediately in kvm_vcpu_init() to pave
the way for removing kvm_arch_vcpu_setup(), i.e. to allow arch specific
code to call vcpu_load() during kvm_arch_vcpu_create().

Back when preemption support was added, the location of the call to init
the preempt notifier was perfectly sane.  The overall vCPU creation flow
featured a single arch specific hook and the preempt notifer was used
immediately after its initialization (by vcpu_load()).  E.g.:

        vcpu = kvm_arch_ops->vcpu_create(kvm, n);
        if (IS_ERR(vcpu))
                return PTR_ERR(vcpu);

        preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);

        vcpu_load(vcpu);
        r = kvm_mmu_setup(vcpu);
        vcpu_put(vcpu);
        if (r < 0)
                goto free_vcpu;

Today, the call to preempt_notifier_init() is sandwiched between two
arch specific calls, kvm_arch_vcpu_create() and kvm_arch_vcpu_setup(),
which needlessly forces x86 (and possibly others?) to split its vCPU
creation flow.  Init the preempt notifier prior to any arch specific
call so that each arch can independently decide how best to organize
its creation flow.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 virt/kvm/kvm_main.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 1d84ae0e3893..4a4d2992d915 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -314,6 +314,7 @@ static int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 	kvm_vcpu_set_dy_eligible(vcpu, false);
 	vcpu->preempted = false;
 	vcpu->ready = false;
+	preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
 
 	r = kvm_arch_vcpu_init(vcpu);
 	if (r < 0)
@@ -2677,8 +2678,6 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
 	if (r)
 		goto vcpu_uninit;
 
-	preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
-
 	r = kvm_arch_vcpu_setup(vcpu);
 	if (r)
 		goto vcpu_destroy;
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 33/45] KVM: x86: Move guts of kvm_arch_vcpu_setup() into kvm_arch_vcpu_create()
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (31 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 32/45] KVM: Move initialization of preempt notifier to kvm_vcpu_init() Sean Christopherson
@ 2019-10-22  1:59 ` Sean Christopherson
  2019-10-22  1:59 ` [PATCH 34/45] KVM: MIPS: Move .vcpu_setup() call to kvm_arch_vcpu_create() Sean Christopherson
                   ` (12 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Fold setup() into create() now that the two are called back-to-back by
common KVM code.  This paves the way for removing kvm_arch_vcpu_setup().

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/x86.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 4d0cc3c9432f..dbb939bd4949 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9021,11 +9021,12 @@ int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
 
 int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 {
-	return kvm_x86_ops->vcpu_create(vcpu);
-}
+	int ret;
+
+	ret = kvm_x86_ops->vcpu_create(vcpu);
+	if (ret)
+		return ret;
 
-int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
-{
 	vcpu->arch.arch_capabilities = kvm_get_arch_capabilities();
 	vcpu->arch.msr_platform_info = MSR_PLATFORM_INFO_CPUID_FAULT;
 	kvm_vcpu_mtrr_init(vcpu);
@@ -9036,6 +9037,11 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
 	return 0;
 }
 
+int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
+{
+	return 0;
+}
+
 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 {
 	struct msr_data msr;
-- 
2.22.0

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kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 34/45] KVM: MIPS: Move .vcpu_setup() call to kvm_arch_vcpu_create()
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (32 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 33/45] KVM: x86: Move guts of kvm_arch_vcpu_setup() into kvm_arch_vcpu_create() Sean Christopherson
@ 2019-10-22  1:59 ` Sean Christopherson
  2019-10-22  1:59 ` [PATCH 35/45] KVM: s390: Manually invoke vcpu setup during kvm_arch_vcpu_create() Sean Christopherson
                   ` (11 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Fold setup() into create() now that the two are called back-to-back by
common KVM code.  This paves the way for removing kvm_arch_vcpu_setup().
Note, there is no unwind function associated with kvm_arch_vcpu_setup(),
i.e. no teardown path that also needs to be moved.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/mips/kvm/mips.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 92c9321b3f95..b3a4435af66b 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -386,8 +386,15 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 	vcpu->arch.last_sched_cpu = -1;
 	vcpu->arch.last_exec_cpu = -1;
 
+	/* Initial guest state */
+	err = kvm_mips_callbacks->vcpu_setup(vcpu);
+	if (err)
+		goto out_free_commpage;
+
 	return 0;
 
+out_free_commpage:
+	kfree(vcpu->arch.kseg0_commpage);
 out_free_gebase:
 	kfree(gebase);
 out:
@@ -1237,10 +1244,9 @@ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 	return 0;
 }
 
-/* Initial guest state */
 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
 {
-	return kvm_mips_callbacks->vcpu_setup(vcpu);
+	return 0;
 }
 
 static void kvm_mips_set_c0_status(void)
-- 
2.22.0

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https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 35/45] KVM: s390: Manually invoke vcpu setup during kvm_arch_vcpu_create()
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (33 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 34/45] KVM: MIPS: Move .vcpu_setup() call to kvm_arch_vcpu_create() Sean Christopherson
@ 2019-10-22  1:59 ` Sean Christopherson
  2019-10-22  1:59 ` [PATCH 36/45] KVM: PPC: BookE: Setup vcpu during kvmppc_core_vcpu_create() Sean Christopherson
                   ` (10 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Rename kvm_arch_vcpu_setup() to kvm_s390_vcpu_setup() and manually call
the new function during kvm_arch_vcpu_create().  Define an empty
kvm_arch_vcpu_setup() as it's still required for compilation.  This
is effectively a nop as kvm_arch_vcpu_create() and kvm_arch_vcpu_setup()
are called back-to-back by common KVM code.  Obsoleting
kvm_arch_vcpu_setup() paves the way for its removal.

Note, gmap_remove() is now called if setup fails, as s390 was previously
freeing it via kvm_arch_vcpu_destroy(), which is called by common KVM
code if kvm_arch_vcpu_setup() fails.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/s390/kvm/kvm-s390.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 1e4f3b9ad031..3e3d242d6630 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2935,6 +2935,11 @@ static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu)
 }
 
 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
+{
+	return 0;
+}
+
+static int kvm_s390_vcpu_setup(struct kvm_vcpu *vcpu)
 {
 	int rc = 0;
 
@@ -3073,8 +3078,14 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 		 vcpu->arch.sie_block);
 	trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block);
 
+	rc = kvm_s390_vcpu_setup(vcpu);
+	if (rc)
+		goto out_ucontrol_uninit;
 	return 0;
 
+out_ucontrol_uninit:
+	if (kvm_is_ucontrol(vcpu->kvm))
+		gmap_remove(vcpu->arch.gmap);
 out_free_sie_block:
 	free_page((unsigned long)(vcpu->arch.sie_block));
 	return rc;
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 36/45] KVM: PPC: BookE: Setup vcpu during kvmppc_core_vcpu_create()
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (34 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 35/45] KVM: s390: Manually invoke vcpu setup during kvm_arch_vcpu_create() Sean Christopherson
@ 2019-10-22  1:59 ` Sean Christopherson
  2019-10-22  1:59 ` [PATCH 37/45] KVM: Drop kvm_arch_vcpu_setup() Sean Christopherson
                   ` (9 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Fold setup() into create() now that the two are called back-to-back by
common KVM code.  This paves the way for removing kvm_arch_vcpu_setup().
Note, BookE directly implements kvm_arch_vcpu_setup() and PPC's common
kvm_arch_vcpu_create() is responsible for its own cleanup, thus the only
cleanup required when directly invoking kvmppc_core_vcpu_setup() is to
call .vcpu_free(), which is the BookE specific portion of PPC's
kvm_arch_vcpu_destroy() by way of kvmppc_core_vcpu_free().

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/powerpc/kvm/booke.c | 60 ++++++++++++++++++++++------------------
 1 file changed, 33 insertions(+), 27 deletions(-)

diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index dd7440e50c7a..b1b5073a22b1 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -1377,34 +1377,9 @@ static void kvmppc_set_tsr(struct kvm_vcpu *vcpu, u32 new_tsr)
 	update_timer_ints(vcpu);
 }
 
-/* Initial guest state: 16MB mapping 0 -> 0, PC = 0, MSR = 0, R1 = 16MB */
 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
 {
-	int i;
-	int r;
-
-	vcpu->arch.regs.nip = 0;
-	vcpu->arch.shared->pir = vcpu->vcpu_id;
-	kvmppc_set_gpr(vcpu, 1, (16<<20) - 8); /* -8 for the callee-save LR slot */
-	kvmppc_set_msr(vcpu, 0);
-
-#ifndef CONFIG_KVM_BOOKE_HV
-	vcpu->arch.shadow_msr = MSR_USER | MSR_IS | MSR_DS;
-	vcpu->arch.shadow_pid = 1;
-	vcpu->arch.shared->msr = 0;
-#endif
-
-	/* Eye-catching numbers so we know if the guest takes an interrupt
-	 * before it's programmed its own IVPR/IVORs. */
-	vcpu->arch.ivpr = 0x55550000;
-	for (i = 0; i < BOOKE_IRQPRIO_MAX; i++)
-		vcpu->arch.ivor[i] = 0x7700 | i * 4;
-
-	kvmppc_init_timing_stats(vcpu);
-
-	r = kvmppc_core_vcpu_setup(vcpu);
-	kvmppc_sanity_check(vcpu);
-	return r;
+	return 0;
 }
 
 int kvmppc_subarch_vcpu_init(struct kvm_vcpu *vcpu)
@@ -2116,7 +2091,38 @@ int kvmppc_core_init_vm(struct kvm *kvm)
 
 int kvmppc_core_vcpu_create(struct kvm_vcpu *vcpu)
 {
-	return kvm->arch.kvm_ops->vcpu_create(vcpu);
+	int i;
+	int r;
+
+	r = kvm->arch.kvm_ops->vcpu_create(vcpu);
+	if (r)
+		return r;
+
+	/* Initial guest state: 16MB mapping 0 -> 0, PC = 0, MSR = 0, R1 = 16MB */
+	vcpu->arch.regs.nip = 0;
+	vcpu->arch.shared->pir = vcpu->vcpu_id;
+	kvmppc_set_gpr(vcpu, 1, (16<<20) - 8); /* -8 for the callee-save LR slot */
+	kvmppc_set_msr(vcpu, 0);
+
+#ifndef CONFIG_KVM_BOOKE_HV
+	vcpu->arch.shadow_msr = MSR_USER | MSR_IS | MSR_DS;
+	vcpu->arch.shadow_pid = 1;
+	vcpu->arch.shared->msr = 0;
+#endif
+
+	/* Eye-catching numbers so we know if the guest takes an interrupt
+	 * before it's programmed its own IVPR/IVORs. */
+	vcpu->arch.ivpr = 0x55550000;
+	for (i = 0; i < BOOKE_IRQPRIO_MAX; i++)
+		vcpu->arch.ivor[i] = 0x7700 | i * 4;
+
+	kvmppc_init_timing_stats(vcpu);
+
+	r = kvmppc_core_vcpu_setup(vcpu);
+	if (r)
+		vcpu->kvm->arch.kvm_ops->vcpu_free(vcpu);
+	kvmppc_sanity_check(vcpu);
+	return r;
 }
 
 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 37/45] KVM: Drop kvm_arch_vcpu_setup()
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (35 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 36/45] KVM: PPC: BookE: Setup vcpu during kvmppc_core_vcpu_create() Sean Christopherson
@ 2019-10-22  1:59 ` Sean Christopherson
  2019-10-22  1:59 ` [PATCH 38/45] KVM: x86: Move all vcpu init code into kvm_arch_vcpu_create() Sean Christopherson
                   ` (8 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Remove kvm_arch_vcpu_setup() now that all arch specific implementations
are nops.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/arm/kvm/guest.c      | 5 -----
 arch/arm64/kvm/guest.c    | 5 -----
 arch/mips/kvm/mips.c      | 5 -----
 arch/powerpc/kvm/book3s.c | 5 -----
 arch/powerpc/kvm/booke.c  | 5 -----
 arch/s390/kvm/kvm-s390.c  | 5 -----
 arch/x86/kvm/x86.c        | 5 -----
 include/linux/kvm_host.h  | 1 -
 virt/kvm/kvm_main.c       | 5 -----
 9 files changed, 41 deletions(-)

diff --git a/arch/arm/kvm/guest.c b/arch/arm/kvm/guest.c
index 684cf64b4033..39323d686448 100644
--- a/arch/arm/kvm/guest.c
+++ b/arch/arm/kvm/guest.c
@@ -30,11 +30,6 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	{ NULL }
 };
 
-int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
-{
-	return 0;
-}
-
 static u64 core_reg_offset_from_id(u64 id)
 {
 	return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE);
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index dfd626447482..483b02425ec8 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -43,11 +43,6 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	{ NULL }
 };
 
-int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
-{
-	return 0;
-}
-
 static bool core_reg_offset_is_vreg(u64 off)
 {
 	return off >= KVM_REG_ARM_CORE_REG(fp_regs.vregs) &&
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index b3a4435af66b..06366e2415a6 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -1244,11 +1244,6 @@ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 	return 0;
 }
 
-int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
-{
-	return 0;
-}
-
 static void kvm_mips_set_c0_status(void)
 {
 	u32 status = read_c0_status();
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index fd049ede2487..2f0ca8237db0 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -496,11 +496,6 @@ int kvmppc_load_last_inst(struct kvm_vcpu *vcpu,
 }
 EXPORT_SYMBOL_GPL(kvmppc_load_last_inst);
 
-int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
-{
-	return 0;
-}
-
 int kvmppc_subarch_vcpu_init(struct kvm_vcpu *vcpu)
 {
 	return 0;
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index b1b5073a22b1..35b781775d3d 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -1377,11 +1377,6 @@ static void kvmppc_set_tsr(struct kvm_vcpu *vcpu, u32 new_tsr)
 	update_timer_ints(vcpu);
 }
 
-int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
-{
-	return 0;
-}
-
 int kvmppc_subarch_vcpu_init(struct kvm_vcpu *vcpu)
 {
 	/* setup watchdog timer once */
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 3e3d242d6630..c3c855fd909c 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2934,11 +2934,6 @@ static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu)
 		vcpu->arch.sie_block->fac = (u32)(u64) model->fac_list;
 }
 
-int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
-{
-	return 0;
-}
-
 static int kvm_s390_vcpu_setup(struct kvm_vcpu *vcpu)
 {
 	int rc = 0;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index dbb939bd4949..e320e6f21202 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9037,11 +9037,6 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 	return 0;
 }
 
-int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
-{
-	return 0;
-}
-
 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 {
 	struct msr_data msr;
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index c36379824408..0b8b0f0ab4d7 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -854,7 +854,6 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
 int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id);
 int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu);
-int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu);
 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);
 
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 4a4d2992d915..1ae98c1f12b0 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2678,10 +2678,6 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
 	if (r)
 		goto vcpu_uninit;
 
-	r = kvm_arch_vcpu_setup(vcpu);
-	if (r)
-		goto vcpu_destroy;
-
 	kvm_create_vcpu_debugfs(vcpu);
 
 	mutex_lock(&kvm->lock);
@@ -2716,7 +2712,6 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
 unlock_vcpu_destroy:
 	mutex_unlock(&kvm->lock);
 	debugfs_remove_recursive(vcpu->debugfs_dentry);
-vcpu_destroy:
 	kvm_arch_vcpu_destroy(vcpu);
 vcpu_uninit:
 	kvm_vcpu_uninit(vcpu);
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 38/45] KVM: x86: Move all vcpu init code into kvm_arch_vcpu_create()
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (36 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 37/45] KVM: Drop kvm_arch_vcpu_setup() Sean Christopherson
@ 2019-10-22  1:59 ` Sean Christopherson
  2019-10-22  1:59 ` [PATCH 39/45] KVM: MIPS: " Sean Christopherson
                   ` (7 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Fold init() into create() now that the two are called back-to-back by
common KVM code (kvm_vcpu_init() calls kvm_arch_vcpu_init() as its last
action, and kvm_vm_ioctl_create_vcpu() calls kvm_arch_vcpu_create()
immediately thereafter).  This paves the way for removing
kvm_arch_vcpu_init() entirely.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/x86.c | 198 +++++++++++++++++++++++----------------------
 1 file changed, 100 insertions(+), 98 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index e320e6f21202..d8d3079af2c5 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9021,11 +9021,78 @@ int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
 
 int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 {
-	int ret;
+	struct page *page;
+	int r;
 
-	ret = kvm_x86_ops->vcpu_create(vcpu);
-	if (ret)
-		return ret;
+	vcpu->arch.emulate_ctxt.ops = &emulate_ops;
+	if (!irqchip_in_kernel(vcpu->kvm) || kvm_vcpu_is_reset_bsp(vcpu))
+		vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
+	else
+		vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;
+
+	kvm_set_tsc_khz(vcpu, max_tsc_khz);
+
+	r = kvm_mmu_create(vcpu);
+	if (r < 0)
+		return r;
+
+	if (irqchip_in_kernel(vcpu->kvm)) {
+		vcpu->arch.apicv_active = kvm_x86_ops->get_enable_apicv(vcpu->kvm);
+		r = kvm_create_lapic(vcpu, lapic_timer_advance_ns);
+		if (r < 0)
+			goto fail_mmu_destroy;
+	} else
+		static_key_slow_inc(&kvm_no_apic_vcpu);
+
+	r = -ENOMEM;
+
+	page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+	if (!page)
+		goto fail_free_lapic;
+	vcpu->arch.pio_data = page_address(page);
+
+	vcpu->arch.mce_banks = kzalloc(KVM_MAX_MCE_BANKS * sizeof(u64) * 4,
+				       GFP_KERNEL_ACCOUNT);
+	if (!vcpu->arch.mce_banks)
+		goto fail_free_pio_data;
+	vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS;
+
+	if (!zalloc_cpumask_var(&vcpu->arch.wbinvd_dirty_mask,
+				GFP_KERNEL_ACCOUNT))
+		goto fail_free_mce_banks;
+
+	vcpu->arch.user_fpu = kmem_cache_zalloc(x86_fpu_cache,
+						GFP_KERNEL_ACCOUNT);
+	if (!vcpu->arch.user_fpu) {
+		pr_err("kvm: failed to allocate userspace's fpu\n");
+		goto free_wbinvd_dirty_mask;
+	}
+
+	vcpu->arch.guest_fpu = kmem_cache_zalloc(x86_fpu_cache,
+						 GFP_KERNEL_ACCOUNT);
+	if (!vcpu->arch.guest_fpu) {
+		pr_err("kvm: failed to allocate vcpu's fpu\n");
+		goto free_user_fpu;
+	}
+	fx_init(vcpu);
+
+	vcpu->arch.guest_xstate_size = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET;
+
+	vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu);
+
+	vcpu->arch.pat = MSR_IA32_CR_PAT_DEFAULT;
+
+	kvm_async_pf_hash_reset(vcpu);
+	kvm_pmu_init(vcpu);
+
+	vcpu->arch.pending_external_vector = -1;
+	vcpu->arch.preempted_in_kernel = false;
+
+	kvm_hv_vcpu_init(vcpu);
+
+	r = kvm_x86_ops->vcpu_create(vcpu);
+	if (r)
+		goto free_guest_fpu;
 
 	vcpu->arch.arch_capabilities = kvm_get_arch_capabilities();
 	vcpu->arch.msr_platform_info = MSR_PLATFORM_INFO_CPUID_FAULT;
@@ -9035,6 +9102,22 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 	kvm_init_mmu(vcpu, false);
 	vcpu_put(vcpu);
 	return 0;
+
+free_guest_fpu:
+	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
+free_user_fpu:
+	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
+free_wbinvd_dirty_mask:
+	free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
+fail_free_mce_banks:
+	kfree(vcpu->arch.mce_banks);
+fail_free_pio_data:
+	free_page((unsigned long)vcpu->arch.pio_data);
+fail_free_lapic:
+	kvm_free_lapic(vcpu);
+fail_mmu_destroy:
+	kvm_mmu_destroy(vcpu);
+	return r;
 }
 
 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
@@ -9067,6 +9150,8 @@ void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 
 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 {
+	int idx;
+
 	kvmclock_reset(vcpu);
 
 	kvm_x86_ops->vcpu_free(vcpu);
@@ -9074,6 +9159,17 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 	free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
 	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
 	kmem_cache_free(x86_fpu_cache, vcpu->arch.guest_fpu);
+
+	kvm_hv_vcpu_uninit(vcpu);
+	kvm_pmu_destroy(vcpu);
+	kfree(vcpu->arch.mce_banks);
+	kvm_free_lapic(vcpu);
+	idx = srcu_read_lock(&vcpu->kvm->srcu);
+	kvm_mmu_destroy(vcpu);
+	srcu_read_unlock(&vcpu->kvm->srcu, idx);
+	free_page((unsigned long)vcpu->arch.pio_data);
+	if (!lapic_in_kernel(vcpu))
+		static_key_slow_dec(&kvm_no_apic_vcpu);
 }
 
 void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
@@ -9309,106 +9405,12 @@ EXPORT_SYMBOL_GPL(kvm_no_apic_vcpu);
 
 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 {
-	struct page *page;
-	int r;
-
-	vcpu->arch.emulate_ctxt.ops = &emulate_ops;
-	if (!irqchip_in_kernel(vcpu->kvm) || kvm_vcpu_is_reset_bsp(vcpu))
-		vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
-	else
-		vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;
-
-	kvm_set_tsc_khz(vcpu, max_tsc_khz);
-
-	r = kvm_mmu_create(vcpu);
-	if (r < 0)
-		return r;
-
-	if (irqchip_in_kernel(vcpu->kvm)) {
-		vcpu->arch.apicv_active = kvm_x86_ops->get_enable_apicv(vcpu->kvm);
-		r = kvm_create_lapic(vcpu, lapic_timer_advance_ns);
-		if (r < 0)
-			goto fail_mmu_destroy;
-	} else
-		static_key_slow_inc(&kvm_no_apic_vcpu);
-
-	r = -ENOMEM;
-
-	page = alloc_page(GFP_KERNEL | __GFP_ZERO);
-	if (!page)
-		goto fail_free_lapic;
-	vcpu->arch.pio_data = page_address(page);
-
-	vcpu->arch.mce_banks = kzalloc(KVM_MAX_MCE_BANKS * sizeof(u64) * 4,
-				       GFP_KERNEL_ACCOUNT);
-	if (!vcpu->arch.mce_banks)
-		goto fail_free_pio_data;
-	vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS;
-
-	if (!zalloc_cpumask_var(&vcpu->arch.wbinvd_dirty_mask,
-				GFP_KERNEL_ACCOUNT))
-		goto fail_free_mce_banks;
-
-	vcpu->arch.user_fpu = kmem_cache_zalloc(x86_fpu_cache,
-						GFP_KERNEL_ACCOUNT);
-	if (!vcpu->arch.user_fpu) {
-		pr_err("kvm: failed to allocate userspace's fpu\n");
-		goto free_wbinvd_dirty_mask;
-	}
-
-	vcpu->arch.guest_fpu = kmem_cache_zalloc(x86_fpu_cache,
-						 GFP_KERNEL_ACCOUNT);
-	if (!vcpu->arch.guest_fpu) {
-		pr_err("kvm: failed to allocate vcpu's fpu\n");
-		goto free_user_fpu;
-	}
-	fx_init(vcpu);
-
-	vcpu->arch.guest_xstate_size = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET;
-
-	vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu);
-
-	vcpu->arch.pat = MSR_IA32_CR_PAT_DEFAULT;
-
-	kvm_async_pf_hash_reset(vcpu);
-	kvm_pmu_init(vcpu);
-
-	vcpu->arch.pending_external_vector = -1;
-	vcpu->arch.preempted_in_kernel = false;
-
-	kvm_hv_vcpu_init(vcpu);
-
 	return 0;
-
-free_user_fpu:
-	kmem_cache_free(x86_fpu_cache, vcpu->arch.user_fpu);
-free_wbinvd_dirty_mask:
-	free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
-fail_free_mce_banks:
-	kfree(vcpu->arch.mce_banks);
-fail_free_pio_data:
-	free_page((unsigned long)vcpu->arch.pio_data);
-fail_free_lapic:
-	kvm_free_lapic(vcpu);
-fail_mmu_destroy:
-	kvm_mmu_destroy(vcpu);
-	return r;
 }
 
 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 {
-	int idx;
 
-	kvm_hv_vcpu_uninit(vcpu);
-	kvm_pmu_destroy(vcpu);
-	kfree(vcpu->arch.mce_banks);
-	kvm_free_lapic(vcpu);
-	idx = srcu_read_lock(&vcpu->kvm->srcu);
-	kvm_mmu_destroy(vcpu);
-	srcu_read_unlock(&vcpu->kvm->srcu, idx);
-	free_page((unsigned long)vcpu->arch.pio_data);
-	if (!lapic_in_kernel(vcpu))
-		static_key_slow_dec(&kvm_no_apic_vcpu);
 }
 
 void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu)
-- 
2.22.0

_______________________________________________
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kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 39/45] KVM: MIPS: Move all vcpu init code into kvm_arch_vcpu_create()
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (37 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 38/45] KVM: x86: Move all vcpu init code into kvm_arch_vcpu_create() Sean Christopherson
@ 2019-10-22  1:59 ` " Sean Christopherson
  2019-10-22  1:59 ` [PATCH 40/45] KVM: ARM: " Sean Christopherson
                   ` (6 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Fold init() into create() now that the two are called back-to-back by
common KVM code (kvm_vcpu_init() calls kvm_arch_vcpu_init() as its last
action, and kvm_vm_ioctl_create_vcpu() calls kvm_arch_vcpu_create()
immediately thereafter).  Rinse and repeat for kvm_arch_vcpu_uninit()
and kvm_arch_vcpu_destroy().  This paves the way for removing
kvm_arch_vcpu_{un}init() entirely.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/mips/kvm/mips.c | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 06366e2415a6..879a7cbd5b54 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -294,6 +294,14 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 	kvm_debug("kvm @ %p: create cpu %d at %p\n",
 		  vcpu->kvm, vcpu->vcpu_id, vcpu);
 
+	err = kvm_mips_callbacks->vcpu_init(vcpu);
+	if (err)
+		return err;
+
+	hrtimer_init(&vcpu->arch.comparecount_timer, CLOCK_MONOTONIC,
+		     HRTIMER_MODE_REL);
+	vcpu->arch.comparecount_timer.function = kvm_mips_comparecount_wakeup;
+
 	/*
 	 * Allocate space for host mode exception handlers that handle
 	 * guest mode exits
@@ -307,7 +315,7 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 
 	if (!gebase) {
 		err = -ENOMEM;
-		goto out;
+		goto out_uninit_vcpu;
 	}
 	kvm_debug("Allocated %d bytes for KVM Exception Handlers @ %p\n",
 		  ALIGN(size, PAGE_SIZE), gebase);
@@ -397,7 +405,8 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 	kfree(vcpu->arch.kseg0_commpage);
 out_free_gebase:
 	kfree(gebase);
-out:
+out_uninit_vcpu:
+	kvm_mips_callbacks->vcpu_uninit(vcpu);
 	return err;
 }
 
@@ -410,6 +419,8 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 	kvm_mmu_free_memory_caches(vcpu);
 	kfree(vcpu->arch.guest_ebase);
 	kfree(vcpu->arch.kseg0_commpage);
+
+	kvm_mips_callbacks->vcpu_uninit(vcpu);
 }
 
 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
@@ -1221,21 +1232,12 @@ static enum hrtimer_restart kvm_mips_comparecount_wakeup(struct hrtimer *timer)
 
 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 {
-	int err;
-
-	err = kvm_mips_callbacks->vcpu_init(vcpu);
-	if (err)
-		return err;
-
-	hrtimer_init(&vcpu->arch.comparecount_timer, CLOCK_MONOTONIC,
-		     HRTIMER_MODE_REL);
-	vcpu->arch.comparecount_timer.function = kvm_mips_comparecount_wakeup;
 	return 0;
 }
 
 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 {
-	kvm_mips_callbacks->vcpu_uninit(vcpu);
+
 }
 
 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 40/45] KVM: ARM: Move all vcpu init code into kvm_arch_vcpu_create()
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (38 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 39/45] KVM: MIPS: " Sean Christopherson
@ 2019-10-22  1:59 ` " Sean Christopherson
  2019-10-22  1:59 ` [PATCH 41/45] KVM: PPC: " Sean Christopherson
                   ` (5 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Fold init() into create() now that the two are called back-to-back by
common KVM code (kvm_vcpu_init() calls kvm_arch_vcpu_init() as its last
action, and kvm_vm_ioctl_create_vcpu() calls kvm_arch_vcpu_create()
immediately thereafter).  This paves the way for removing
kvm_arch_vcpu_{un}init() entirely.

Note, there is no associated unwinding in kvm_arch_vcpu_uninit() that
needs to be relocated (to kvm_arch_vcpu_destroy()).

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 virt/kvm/arm/arm.c | 30 ++++++++++++++++++------------
 1 file changed, 18 insertions(+), 12 deletions(-)

diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index 1ab151d43fd7..aac4e5a1a521 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -266,6 +266,23 @@ int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
 
 int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 {
+	int err;
+
+	/* Force users to call KVM_ARM_VCPU_INIT */
+	vcpu->arch.target = -1;
+	bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
+
+	/* Set up the timer */
+	kvm_timer_vcpu_init(vcpu);
+
+	kvm_pmu_vcpu_init(vcpu);
+
+	kvm_arm_reset_debug_ptr(vcpu);
+
+	err = kvm_vgic_vcpu_init(vcpu);
+	if (err)
+		return err;
+
 	return create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP);
 }
 
@@ -311,18 +328,7 @@ void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
 
 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 {
-	/* Force users to call KVM_ARM_VCPU_INIT */
-	vcpu->arch.target = -1;
-	bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
-
-	/* Set up the timer */
-	kvm_timer_vcpu_init(vcpu);
-
-	kvm_pmu_vcpu_init(vcpu);
-
-	kvm_arm_reset_debug_ptr(vcpu);
-
-	return kvm_vgic_vcpu_init(vcpu);
+	return 0;
 }
 
 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 41/45] KVM: PPC: Move all vcpu init code into kvm_arch_vcpu_create()
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (39 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 40/45] KVM: ARM: " Sean Christopherson
@ 2019-10-22  1:59 ` " Sean Christopherson
  2019-10-22  1:59 ` [PATCH 42/45] KVM: arm64: Free sve_state via arm specific hook Sean Christopherson
                   ` (4 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Fold init() into create() now that the two are called back-to-back by
common KVM code (kvm_vcpu_init() calls kvm_arch_vcpu_init() as its last
action, and kvm_vm_ioctl_create_vcpu() calls kvm_arch_vcpu_create()
immediately thereafter).  Rinse and repeat for kvm_arch_vcpu_uninit()
and kvm_arch_vcpu_destroy().  This paves the way for removing
kvm_arch_vcpu_{un}init() entirely.

Note, calling kvmppc_mmu_destroy() if kvmppc_core_vcpu_create() fails
may or may not be necessary.  Move it along with the more obvious call
to kvmppc_subarch_vcpu_uninit() so as not to inadvertantly introduce a
functional change and/or bug.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/powerpc/kvm/powerpc.c | 36 ++++++++++++++++++++++--------------
 1 file changed, 22 insertions(+), 14 deletions(-)

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index b14e1314f020..3078231bd384 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -725,13 +725,29 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 {
 	int err;
 
-	err = kvmppc_core_vcpu_create(vcpu);
+	hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
+	vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
+	vcpu->arch.dec_expires = get_tb();
+
+#ifdef CONFIG_KVM_EXIT_TIMING
+	mutex_init(&vcpu->arch.exit_timing_lock);
+#endif
+	err = kvmppc_subarch_vcpu_init(vcpu);
 	if (err)
 		return err;
 
+	err = kvmppc_core_vcpu_create(vcpu);
+	if (err)
+		goto out_vcpu_uninit;
+
 	vcpu->arch.wqp = &vcpu->wq;
 	kvmppc_create_vcpu_debugfs(vcpu, vcpu->vcpu_id);
 	return 0;
+
+out_vcpu_uninit:
+	kvmppc_mmu_destroy(vcpu);
+	kvmppc_subarch_vcpu_uninit(vcpu);
+	return err;
 }
 
 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
@@ -761,6 +777,9 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 	}
 
 	kvmppc_core_vcpu_free(vcpu);
+
+	kvmppc_mmu_destroy(vcpu);
+	kvmppc_subarch_vcpu_uninit(vcpu);
 }
 
 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
@@ -780,23 +799,12 @@ static enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
 
 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 {
-	int ret;
-
-	hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
-	vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
-	vcpu->arch.dec_expires = get_tb();
-
-#ifdef CONFIG_KVM_EXIT_TIMING
-	mutex_init(&vcpu->arch.exit_timing_lock);
-#endif
-	ret = kvmppc_subarch_vcpu_init(vcpu);
-	return ret;
+	return 0;
 }
 
 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 {
-	kvmppc_mmu_destroy(vcpu);
-	kvmppc_subarch_vcpu_uninit(vcpu);
+
 }
 
 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 42/45] KVM: arm64: Free sve_state via arm specific hook
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (40 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 41/45] KVM: PPC: " Sean Christopherson
@ 2019-10-22  1:59 ` Sean Christopherson
  2019-10-22 11:43   ` Christoffer Dall
  2019-10-22  1:59 ` [PATCH 43/45] KVM: Drop kvm_arch_vcpu_init() and kvm_arch_vcpu_uninit() Sean Christopherson
                   ` (3 subsequent siblings)
  45 siblings, 1 reply; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Add an arm specific hook to free the arm64-only sve_state.  Doing so
eliminates the last functional code from kvm_arch_vcpu_uninit() across
all architectures and paves the way for removing kvm_arch_vcpu_init()
and kvm_arch_vcpu_uninit() entirely.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/arm/include/asm/kvm_host.h   | 1 +
 arch/arm64/include/asm/kvm_host.h | 1 +
 arch/arm64/kvm/reset.c            | 5 +++++
 virt/kvm/arm/arm.c                | 2 ++
 4 files changed, 9 insertions(+)

diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index 8a37c8e89777..cc414de5acd3 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -333,6 +333,7 @@ static inline void kvm_arch_sync_events(struct kvm *kvm) {}
 static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
 static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
+static inline int kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu) {}
 
 static inline void kvm_arm_init_debug(void) {}
 static inline void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) {}
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index f656169db8c3..92d7c384a4ed 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -52,6 +52,7 @@ int kvm_arm_init_sve(void);
 
 int __attribute_const__ kvm_target_cpu(void);
 int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
+int kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu);
 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
 int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext);
 void __extended_idmap_trampoline(phys_addr_t boot_pgd, phys_addr_t idmap_start);
diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
index f4a8ae918827..98abc4278f42 100644
--- a/arch/arm64/kvm/reset.c
+++ b/arch/arm64/kvm/reset.c
@@ -205,6 +205,11 @@ bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu)
 }
 
 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
+{
+
+}
+
+int kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu)
 {
 	kfree(vcpu->arch.sve_state);
 }
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index aac4e5a1a521..b38088415cde 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -298,6 +298,8 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 	kvm_mmu_free_memory_caches(vcpu);
 	kvm_timer_vcpu_terminate(vcpu);
 	kvm_pmu_vcpu_destroy(vcpu);
+
+	kvm_arm_vcpu_destroy(vcpu);
 }
 
 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 43/45] KVM: Drop kvm_arch_vcpu_init() and kvm_arch_vcpu_uninit()
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (41 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 42/45] KVM: arm64: Free sve_state via arm specific hook Sean Christopherson
@ 2019-10-22  1:59 ` Sean Christopherson
  2019-10-22  1:59 ` [PATCH 44/45] KVM: Move putting of vcpu->pid to kvm_vcpu_destroy() Sean Christopherson
                   ` (2 subsequent siblings)
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Remove kvm_arch_vcpu_init() and kvm_arch_vcpu_uninit() now that all
arch specific implementations are nops.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/arm/include/asm/kvm_host.h   |  1 -
 arch/arm64/include/asm/kvm_host.h |  1 -
 arch/arm64/kvm/reset.c            |  5 -----
 arch/mips/kvm/mips.c              | 10 ----------
 arch/powerpc/kvm/powerpc.c        | 10 ----------
 arch/s390/include/asm/kvm_host.h  |  1 -
 arch/s390/kvm/kvm-s390.c          |  5 -----
 arch/x86/kvm/x86.c                | 10 ----------
 include/linux/kvm_host.h          |  3 ---
 virt/kvm/arm/arm.c                |  5 -----
 virt/kvm/kvm_main.c               | 16 ++--------------
 11 files changed, 2 insertions(+), 65 deletions(-)

diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index cc414de5acd3..d0d84a4c8165 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -330,7 +330,6 @@ struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
 static inline bool kvm_arch_requires_vhe(void) { return false; }
 static inline void kvm_arch_hardware_unsetup(void) {}
 static inline void kvm_arch_sync_events(struct kvm *kvm) {}
-static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
 static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
 static inline int kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu) {}
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 92d7c384a4ed..7b46725f1bdb 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -53,7 +53,6 @@ int kvm_arm_init_sve(void);
 int __attribute_const__ kvm_target_cpu(void);
 int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
 int kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu);
-void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
 int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext);
 void __extended_idmap_trampoline(phys_addr_t boot_pgd, phys_addr_t idmap_start);
 
diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
index 98abc4278f42..c683364cc84b 100644
--- a/arch/arm64/kvm/reset.c
+++ b/arch/arm64/kvm/reset.c
@@ -204,11 +204,6 @@ bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu)
 	return true;
 }
 
-void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
-{
-
-}
-
 int kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu)
 {
 	kfree(vcpu->arch.sve_state);
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 879a7cbd5b54..2606f3f02b54 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -1230,16 +1230,6 @@ static enum hrtimer_restart kvm_mips_comparecount_wakeup(struct hrtimer *timer)
 	return kvm_mips_count_timeout(vcpu);
 }
 
-int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
-{
-	return 0;
-}
-
-void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
-{
-
-}
-
 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 				  struct kvm_translation *tr)
 {
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 3078231bd384..3215ebce0ed9 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -797,16 +797,6 @@ static enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
 	return HRTIMER_NORESTART;
 }
 
-int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
-{
-	return 0;
-}
-
-void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
-{
-
-}
-
 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 {
 #ifdef CONFIG_BOOKE
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index abe60268335d..e0a542fd5559 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -913,7 +913,6 @@ extern int kvm_s390_gisc_unregister(struct kvm *kvm, u32 gisc);
 
 static inline void kvm_arch_hardware_disable(void) {}
 static inline void kvm_arch_sync_events(struct kvm *kvm) {}
-static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
 static inline void kvm_arch_free_memslot(struct kvm *kvm,
 		struct kvm_memory_slot *free, struct kvm_memory_slot *dont) {}
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index c3c855fd909c..1ee64352440f 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2703,11 +2703,6 @@ static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id)
 	return rc == 0 && id < KVM_S390_ESCA_CPU_SLOTS;
 }
 
-int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
-{
-	return 0;
-}
-
 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
 static void __start_cpu_timer_accounting(struct kvm_vcpu *vcpu)
 {
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index d8d3079af2c5..07b43cdc4d0b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9403,16 +9403,6 @@ bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu)
 struct static_key kvm_no_apic_vcpu __read_mostly;
 EXPORT_SYMBOL_GPL(kvm_no_apic_vcpu);
 
-int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
-{
-	return 0;
-}
-
-void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
-{
-
-}
-
 void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu)
 {
 	vcpu->arch.l1tf_flush_l1d = true;
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 0b8b0f0ab4d7..e5b4198cd267 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -845,9 +845,6 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);
 int kvm_arch_init(void *opaque);
 void kvm_arch_exit(void);
 
-int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu);
-void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
-
 void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu);
 
 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index b38088415cde..9079f7412379 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -328,11 +328,6 @@ void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
 	kvm_vgic_v4_disable_doorbell(vcpu);
 }
 
-int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
-{
-	return 0;
-}
-
 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 {
 	int *last_ran;
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 1ae98c1f12b0..b1f4ee9c2c76 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -290,7 +290,6 @@ void kvm_reload_remote_mmus(struct kvm *kvm)
 static int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 {
 	struct page *page;
-	int r;
 
 	mutex_init(&vcpu->mutex);
 	vcpu->cpu = -1;
@@ -304,10 +303,8 @@ static int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 	INIT_LIST_HEAD(&vcpu->blocked_vcpu_list);
 
 	page = alloc_page(GFP_KERNEL | __GFP_ZERO);
-	if (!page) {
-		r = -ENOMEM;
-		goto fail;
-	}
+	if (!page)
+		return -ENOMEM;
 	vcpu->run = page_address(page);
 
 	kvm_vcpu_set_in_spin_loop(vcpu, false);
@@ -316,15 +313,7 @@ static int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 	vcpu->ready = false;
 	preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
 
-	r = kvm_arch_vcpu_init(vcpu);
-	if (r < 0)
-		goto fail_free_run;
 	return 0;
-
-fail_free_run:
-	free_page((unsigned long)vcpu->run);
-fail:
-	return r;
 }
 
 static void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
@@ -335,7 +324,6 @@ static void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
 	 * descriptors are already gone.
 	 */
 	put_pid(rcu_dereference_protected(vcpu->pid, 1));
-	kvm_arch_vcpu_uninit(vcpu);
 	free_page((unsigned long)vcpu->run);
 }
 
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 44/45] KVM: Move putting of vcpu->pid to kvm_vcpu_destroy()
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (42 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 43/45] KVM: Drop kvm_arch_vcpu_init() and kvm_arch_vcpu_uninit() Sean Christopherson
@ 2019-10-22  1:59 ` Sean Christopherson
  2019-10-22  1:59 ` [PATCH 45/45] KVM: Move vcpu->run page allocation out of kvm_vcpu_init() Sean Christopherson
  2019-10-22 11:51 ` [PATCH 00/45] KVM: Refactor vCPU creation Christoffer Dall
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Move the putting of vcpu->pid to kvm_vcpu_destroy().  vcpu->pid is
guaranteed to be NULL when kvm_vcpu_uninit() is called in the error
path of kvm_vm_ioctl_create_vcpu(), e.g. it is explicit nullified by
kvm_vcpu_init() and is only changed by KVM_RUN.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 virt/kvm/kvm_main.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index b1f4ee9c2c76..c079b22032fa 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -318,12 +318,6 @@ static int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 
 static void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
 {
-	/*
-	 * no need for rcu_read_lock as VCPU_RUN is the only place that
-	 * will change the vcpu->pid pointer and on uninit all file
-	 * descriptors are already gone.
-	 */
-	put_pid(rcu_dereference_protected(vcpu->pid, 1));
 	free_page((unsigned long)vcpu->run);
 }
 
@@ -331,6 +325,13 @@ void kvm_vcpu_destroy(struct kvm_vcpu *vcpu)
 {
 	kvm_arch_vcpu_destroy(vcpu);
 
+	/*
+	 * No need for rcu_read_lock as VCPU_RUN is the only place that changes
+	 * the vcpu->pid pointer, and at destruction time all file descriptors
+	 * are already gone.
+	 */
+	put_pid(rcu_dereference_protected(vcpu->pid, 1));
+
 	kvm_vcpu_uninit(vcpu);
 	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* [PATCH 45/45] KVM: Move vcpu->run page allocation out of kvm_vcpu_init()
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (43 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 44/45] KVM: Move putting of vcpu->pid to kvm_vcpu_destroy() Sean Christopherson
@ 2019-10-22  1:59 ` Sean Christopherson
  2019-10-22 11:51 ` [PATCH 00/45] KVM: Refactor vCPU creation Christoffer Dall
  45 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22  1:59 UTC (permalink / raw)
  To: Marc Zyngier, James Hogan, Paul Mackerras, Christian Borntraeger,
	Janosch Frank, Paolo Bonzini, Radim Krčmář
  Cc: kvm-ppc, Wanpeng Li, kvm, David Hildenbrand, Joerg Roedel,
	Cornelia Huck, linux-mips, Sean Christopherson, linux-kernel,
	linux-arm-kernel, Vitaly Kuznetsov, kvmarm, Jim Mattson

Open code the allocation and freeing of the vcpu->run page in
kvm_vm_ioctl_create_vcpu() and kvm_vcpu_destroy() respectively.  Doing
so allows kvm_vcpu_init() to be a pure init function and eliminates
kvm_vcpu_uninit() entirely.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 virt/kvm/kvm_main.c | 34 +++++++++++++---------------------
 1 file changed, 13 insertions(+), 21 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index c079b22032fa..e532c6e606c0 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -287,10 +287,8 @@ void kvm_reload_remote_mmus(struct kvm *kvm)
 	kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
 }
 
-static int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
+static void kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 {
-	struct page *page;
-
 	mutex_init(&vcpu->mutex);
 	vcpu->cpu = -1;
 	vcpu->kvm = kvm;
@@ -302,23 +300,11 @@ static int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 	vcpu->pre_pcpu = -1;
 	INIT_LIST_HEAD(&vcpu->blocked_vcpu_list);
 
-	page = alloc_page(GFP_KERNEL | __GFP_ZERO);
-	if (!page)
-		return -ENOMEM;
-	vcpu->run = page_address(page);
-
 	kvm_vcpu_set_in_spin_loop(vcpu, false);
 	kvm_vcpu_set_dy_eligible(vcpu, false);
 	vcpu->preempted = false;
 	vcpu->ready = false;
 	preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
-
-	return 0;
-}
-
-static void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
-{
-	free_page((unsigned long)vcpu->run);
 }
 
 void kvm_vcpu_destroy(struct kvm_vcpu *vcpu)
@@ -332,7 +318,7 @@ void kvm_vcpu_destroy(struct kvm_vcpu *vcpu)
 	 */
 	put_pid(rcu_dereference_protected(vcpu->pid, 1));
 
-	kvm_vcpu_uninit(vcpu);
+	free_page((unsigned long)vcpu->run);
 	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
 EXPORT_SYMBOL_GPL(kvm_vcpu_destroy);
@@ -2636,6 +2622,7 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
 {
 	int r;
 	struct kvm_vcpu *vcpu;
+	struct page *page;
 
 	if (id >= KVM_MAX_VCPU_ID)
 		return -EINVAL;
@@ -2659,13 +2646,18 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
 		goto vcpu_decrement;
 	}
 
-	r = kvm_vcpu_init(vcpu, kvm, id);
-	if (r)
+	page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+	if (!page) {
+		r = -ENOMEM;
 		goto vcpu_free;
+	}
+	vcpu->run = page_address(page);
+
+	kvm_vcpu_init(vcpu, kvm, id);
 
 	r = kvm_arch_vcpu_create(vcpu);
 	if (r)
-		goto vcpu_uninit;
+		goto vcpu_free_run_page;
 
 	kvm_create_vcpu_debugfs(vcpu);
 
@@ -2702,8 +2694,8 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
 	mutex_unlock(&kvm->lock);
 	debugfs_remove_recursive(vcpu->debugfs_dentry);
 	kvm_arch_vcpu_destroy(vcpu);
-vcpu_uninit:
-	kvm_vcpu_uninit(vcpu);
+vcpu_free_run_page:
+	free_page((unsigned long)vcpu->run);
 vcpu_free:
 	kmem_cache_free(kvm_vcpu_cache, vcpu);
 vcpu_decrement:
-- 
2.22.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 51+ messages in thread

* Re: [PATCH 42/45] KVM: arm64: Free sve_state via arm specific hook
  2019-10-22  1:59 ` [PATCH 42/45] KVM: arm64: Free sve_state via arm specific hook Sean Christopherson
@ 2019-10-22 11:43   ` Christoffer Dall
  2019-10-22 18:41     ` Sean Christopherson
  0 siblings, 1 reply; 51+ messages in thread
From: Christoffer Dall @ 2019-10-22 11:43 UTC (permalink / raw)
  To: Sean Christopherson
  Cc: Cornelia Huck, Wanpeng Li, Janosch Frank, kvm, Marc Zyngier,
	Joerg Roedel, David Hildenbrand, linux-mips, kvm-ppc,
	linux-kernel, Paul Mackerras, Christian Borntraeger, James Hogan,
	Paolo Bonzini, Vitaly Kuznetsov, kvmarm, linux-arm-kernel,
	Jim Mattson

On Mon, Oct 21, 2019 at 06:59:22PM -0700, Sean Christopherson wrote:
> Add an arm specific hook to free the arm64-only sve_state.  Doing so
> eliminates the last functional code from kvm_arch_vcpu_uninit() across
> all architectures and paves the way for removing kvm_arch_vcpu_init()
> and kvm_arch_vcpu_uninit() entirely.
> 
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> ---
>  arch/arm/include/asm/kvm_host.h   | 1 +
>  arch/arm64/include/asm/kvm_host.h | 1 +
>  arch/arm64/kvm/reset.c            | 5 +++++
>  virt/kvm/arm/arm.c                | 2 ++
>  4 files changed, 9 insertions(+)
> 
> diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
> index 8a37c8e89777..cc414de5acd3 100644
> --- a/arch/arm/include/asm/kvm_host.h
> +++ b/arch/arm/include/asm/kvm_host.h
> @@ -333,6 +333,7 @@ static inline void kvm_arch_sync_events(struct kvm *kvm) {}
>  static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
>  static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
>  static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
> +static inline int kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu) {}
>  
>  static inline void kvm_arm_init_debug(void) {}
>  static inline void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) {}
> diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> index f656169db8c3..92d7c384a4ed 100644
> --- a/arch/arm64/include/asm/kvm_host.h
> +++ b/arch/arm64/include/asm/kvm_host.h
> @@ -52,6 +52,7 @@ int kvm_arm_init_sve(void);
>  
>  int __attribute_const__ kvm_target_cpu(void);
>  int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
> +int kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu);
>  void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
>  int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext);
>  void __extended_idmap_trampoline(phys_addr_t boot_pgd, phys_addr_t idmap_start);
> diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
> index f4a8ae918827..98abc4278f42 100644
> --- a/arch/arm64/kvm/reset.c
> +++ b/arch/arm64/kvm/reset.c
> @@ -205,6 +205,11 @@ bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu)
>  }
>  
>  void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
> +{
> +
> +}
> +
> +int kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu)
>  {
>  	kfree(vcpu->arch.sve_state);
>  }

nit: warning: control reaches end of non-void function

> diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
> index aac4e5a1a521..b38088415cde 100644
> --- a/virt/kvm/arm/arm.c
> +++ b/virt/kvm/arm/arm.c
> @@ -298,6 +298,8 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
>  	kvm_mmu_free_memory_caches(vcpu);
>  	kvm_timer_vcpu_terminate(vcpu);
>  	kvm_pmu_vcpu_destroy(vcpu);
> +
> +	kvm_arm_vcpu_destroy(vcpu);
>  }
>  
>  int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
> -- 
> 2.22.0
> 
> _______________________________________________

Thanks,

    Christoffer
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^ permalink raw reply	[flat|nested] 51+ messages in thread

* Re: [PATCH 00/45] KVM: Refactor vCPU creation
  2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
                   ` (44 preceding siblings ...)
  2019-10-22  1:59 ` [PATCH 45/45] KVM: Move vcpu->run page allocation out of kvm_vcpu_init() Sean Christopherson
@ 2019-10-22 11:51 ` Christoffer Dall
  45 siblings, 0 replies; 51+ messages in thread
From: Christoffer Dall @ 2019-10-22 11:51 UTC (permalink / raw)
  To: Sean Christopherson
  Cc: Cornelia Huck, Wanpeng Li, Janosch Frank, kvm, Marc Zyngier,
	Joerg Roedel, David Hildenbrand, linux-mips, kvm-ppc,
	linux-kernel, Paul Mackerras, Christian Borntraeger, James Hogan,
	Paolo Bonzini, Vitaly Kuznetsov, kvmarm, linux-arm-kernel,
	Jim Mattson

Hi Sean,

On Mon, Oct 21, 2019 at 06:58:40PM -0700, Sean Christopherson wrote:
> *************************** DISCLAIMER **********************************
> The non-x86 arch specific patches are completely untested.  Although the
> changes are conceptually straightforward, I'm not remotely confident that
> the patches are bug free, e.g. checkpatch caught several blatant typos
> that would break compilation.
> *************************************************************************
> 
> The end goal of this series is to strip down the interface between common
> KVM code and arch specific code so that there is precisely one arch hook
> for creating a vCPU and one hook for destroying a vCPU.  In addition to
> cleaning up the code base, simplifying the interface gives architectures
> more freedom to organize their vCPU creation code.
> 
> KVM's vCPU creation code is comically messy.  kvm_vm_ioctl_create_vcpu()
> calls three separate arch hooks: init(), create() and setup().  The init()
> call is especially nasty as it's hidden away in a common KVM function,
> kvm_init_vcpu(), that for all intents and purposes must be immediately
> invoked after the vcpu object is allocated.
> 
> Not to be outdone, vCPU destruction also has three arch hooks: uninit(),
> destroy() and free(), the latter of which isn't actually invoked by common
> KVM code, but the hook declaration still exists because architectures are
> relying on its forward declaration.
> 
> Eliminating the extra arch hooks is relatively straightforward, just
> tedious.  For the most part, there is no fundamental constraint that
> necessitated the proliferation of arch hooks, rather they crept in over
> time, usually when x86-centric code was moved out of generic KVM and into
> x86 code.
> 
> E.g. kvm_arch_vcpu_setup() was added to allow x86 to do vcpu_load(), which
> can only be done after preempt_notifier initialization, but adding setup()
> overlooked the fact that the preempt_notifier was only initialized after
> kvm_arch_vcpu_create() because preemption support was added when x86's MMU
> setup (the vcpu_load() user) was called from common KVM code.
> 
> For all intents and purposes, there is no true functional change in this
> series.  The order of some allocations will change, and a few memory leaks
> are fixed, but the actual functionality of a guest should be unaffected.
> 
> Patches 01-03 are bug fixes in error handling paths that were found by
> inspection when refactoring the associated code.
> 
> Patches 04-43 refactor each arch implementation so that the unwanted arch
> hooks can be dropped without a functional change, e.g. move code out of
> kvm_arch_vcpu_setup() so that all implementations are empty, then drop the
> functions and caller.
> 
> Patches 44-45 are minor clean up to eliminate kvm_vcpu_uninit().
> 
> 
> The net result is to go from this:
> 
>         vcpu = kvm_arch_vcpu_create(kvm, id);
>                |
>                |-> kvm_vcpu_init()
>                    |
>                    |-> kvm_arch_vcpu_init()
> 
>         if (IS_ERR(vcpu)) {
>                 r = PTR_ERR(vcpu);
>                 goto vcpu_decrement;
>         }
> 
>         preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
> 
>         r = kvm_arch_vcpu_setup(vcpu);
>         if (r)
>                 goto vcpu_destroy;
> 
> to this:
> 
>         r = kvm_arch_vcpu_precreate(kvm, id);
>         if (r)
>                 goto vcpu_decrement;
> 
>         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
>         if (!vcpu) {
>                 r = -ENOMEM;
>                 goto vcpu_decrement;
>         }
> 
>         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
>         if (!page) {
>                 r = -ENOMEM;
>                 goto vcpu_free;
>         }
>         vcpu->run = page_address(page);
> 
>         kvm_vcpu_init(vcpu, kvm, id);
> 
>         r = kvm_arch_vcpu_create(vcpu);
>         if (r)
>                 goto vcpu_free_run_page;
> 

What a fantastically welcome piece of work!  Thanks for doing this,
many's the time I waded through all those calls to ensure a patch was
doing the right thing.

Modulo the nit in patch 42, the arm64 changes survive a guest boot +
hackbench and build fine.  The lack of changing the arm-specific destroy
function to a void also causes a series of warnings for a 32-bit arm
build, but otherwise builds fine.

You can add my:

  Acked-by: Christoffer Dall <christoffer.dall@arm.com>

To the arm/arm64 and generic parts.


Thanks,

    Christoffer
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^ permalink raw reply	[flat|nested] 51+ messages in thread

* Re: [PATCH 42/45] KVM: arm64: Free sve_state via arm specific hook
  2019-10-22 11:43   ` Christoffer Dall
@ 2019-10-22 18:41     ` Sean Christopherson
  0 siblings, 0 replies; 51+ messages in thread
From: Sean Christopherson @ 2019-10-22 18:41 UTC (permalink / raw)
  To: Christoffer Dall
  Cc: Cornelia Huck, Wanpeng Li, Janosch Frank, kvm, Marc Zyngier,
	Joerg Roedel, David Hildenbrand, linux-mips, kvm-ppc,
	linux-kernel, Paul Mackerras, Christian Borntraeger, James Hogan,
	Paolo Bonzini, Vitaly Kuznetsov, kvmarm, linux-arm-kernel,
	Jim Mattson

On Tue, Oct 22, 2019 at 01:43:42PM +0200, Christoffer Dall wrote:
> On Mon, Oct 21, 2019 at 06:59:22PM -0700, Sean Christopherson wrote:
> > Add an arm specific hook to free the arm64-only sve_state.  Doing so
> > eliminates the last functional code from kvm_arch_vcpu_uninit() across
> > all architectures and paves the way for removing kvm_arch_vcpu_init()
> > and kvm_arch_vcpu_uninit() entirely.
> > 
> > Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> > ---
> >  arch/arm/include/asm/kvm_host.h   | 1 +
> >  arch/arm64/include/asm/kvm_host.h | 1 +
> >  arch/arm64/kvm/reset.c            | 5 +++++
> >  virt/kvm/arm/arm.c                | 2 ++
> >  4 files changed, 9 insertions(+)
> > 
> > diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
> > index 8a37c8e89777..cc414de5acd3 100644
> > --- a/arch/arm/include/asm/kvm_host.h
> > +++ b/arch/arm/include/asm/kvm_host.h
> > @@ -333,6 +333,7 @@ static inline void kvm_arch_sync_events(struct kvm *kvm) {}
> >  static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
> >  static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
> >  static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
> > +static inline int kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu) {}
> >  
> >  static inline void kvm_arm_init_debug(void) {}
> >  static inline void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) {}
> > diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> > index f656169db8c3..92d7c384a4ed 100644
> > --- a/arch/arm64/include/asm/kvm_host.h
> > +++ b/arch/arm64/include/asm/kvm_host.h
> > @@ -52,6 +52,7 @@ int kvm_arm_init_sve(void);
> >  
> >  int __attribute_const__ kvm_target_cpu(void);
> >  int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
> > +int kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu);
> >  void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
> >  int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext);
> >  void __extended_idmap_trampoline(phys_addr_t boot_pgd, phys_addr_t idmap_start);
> > diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
> > index f4a8ae918827..98abc4278f42 100644
> > --- a/arch/arm64/kvm/reset.c
> > +++ b/arch/arm64/kvm/reset.c
> > @@ -205,6 +205,11 @@ bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu)
> >  }
> >  
> >  void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
> > +{
> > +
> > +}
> > +
> > +int kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu)
> >  {
> >  	kfree(vcpu->arch.sve_state);
> >  }
> 
> nit: warning: control reaches end of non-void function

Doh, fixed.  Thanks for the quick review!
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^ permalink raw reply	[flat|nested] 51+ messages in thread

* Re: [PATCH 01/45] KVM: PPC: Book3S HV: Uninit vCPU if vcore creation fails
  2019-10-22  1:58 ` [PATCH 01/45] KVM: PPC: Book3S HV: Uninit vCPU if vcore creation fails Sean Christopherson
@ 2019-10-24  7:04   ` Greg Kurz
  0 siblings, 0 replies; 51+ messages in thread
From: Greg Kurz @ 2019-10-24  7:04 UTC (permalink / raw)
  To: Sean Christopherson
  Cc: Wanpeng Li, kvm, James Hogan, linux-kernel, Paul Mackerras,
	kvmarm, Janosch Frank, Marc Zyngier, Joerg Roedel,
	David Hildenbrand, Christian Borntraeger, kvm-ppc,
	linux-arm-kernel, Jim Mattson, Cornelia Huck, linux-mips,
	Paolo Bonzini, Vitaly Kuznetsov

On Mon, 21 Oct 2019 18:58:41 -0700
Sean Christopherson <sean.j.christopherson@intel.com> wrote:

> Call kvm_vcpu_uninit() if vcore creation fails to avoid leaking any
> resources allocated by kvm_vcpu_init(), i.e. the vcpu->run page.
> 
> Fixes: 371fefd6f2dc4 ("KVM: PPC: Allow book3s_hv guests to use SMT processor modes")
> Cc: stable@vger.kernel.org
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> ---

Reviewed-by: Greg Kurz <groug@kaod.org>

>  arch/powerpc/kvm/book3s_hv.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
> index 709cf1fd4cf4..36abbe3c346d 100644
> --- a/arch/powerpc/kvm/book3s_hv.c
> +++ b/arch/powerpc/kvm/book3s_hv.c
> @@ -2354,7 +2354,7 @@ static struct kvm_vcpu *kvmppc_core_vcpu_create_hv(struct kvm *kvm,
>  	mutex_unlock(&kvm->lock);
>  
>  	if (!vcore)
> -		goto free_vcpu;
> +		goto uninit_vcpu;
>  
>  	spin_lock(&vcore->lock);
>  	++vcore->num_threads;
> @@ -2371,6 +2371,8 @@ static struct kvm_vcpu *kvmppc_core_vcpu_create_hv(struct kvm *kvm,
>  
>  	return vcpu;
>  
> +uninit_vcpu:
> +	kvm_vcpu_uninit(vcpu);
>  free_vcpu:
>  	kmem_cache_free(kvm_vcpu_cache, vcpu);
>  out:

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^ permalink raw reply	[flat|nested] 51+ messages in thread

* Re: [PATCH 02/45] KVM: PPC: Book3S PR: Free shared page if mmu initialization fails
  2019-10-22  1:58 ` [PATCH 02/45] KVM: PPC: Book3S PR: Free shared page if mmu initialization fails Sean Christopherson
@ 2019-10-24  7:05   ` Greg Kurz
  0 siblings, 0 replies; 51+ messages in thread
From: Greg Kurz @ 2019-10-24  7:05 UTC (permalink / raw)
  To: Sean Christopherson
  Cc: Wanpeng Li, kvm, James Hogan, linux-kernel, Paul Mackerras,
	kvmarm, Janosch Frank, Marc Zyngier, Joerg Roedel,
	David Hildenbrand, Christian Borntraeger, kvm-ppc,
	linux-arm-kernel, Jim Mattson, Cornelia Huck, linux-mips,
	Paolo Bonzini, Vitaly Kuznetsov

On Mon, 21 Oct 2019 18:58:42 -0700
Sean Christopherson <sean.j.christopherson@intel.com> wrote:

> Explicitly free the shared page if kvmppc_mmu_init() fails during
> kvmppc_core_vcpu_create(), as the page is freed only in
> kvmppc_core_vcpu_free(), which is not reached via kvm_vcpu_uninit().
> 
> Fixes: 96bc451a15329 ("KVM: PPC: Introduce shared page")
> Cc: stable@vger.kernel.org
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> ---

Reviewed-by: Greg Kurz <groug@kaod.org>

>  arch/powerpc/kvm/book3s_pr.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
> index cc65af8fe6f7..3f6ad3f58628 100644
> --- a/arch/powerpc/kvm/book3s_pr.c
> +++ b/arch/powerpc/kvm/book3s_pr.c
> @@ -1769,10 +1769,12 @@ static struct kvm_vcpu *kvmppc_core_vcpu_create_pr(struct kvm *kvm,
>  
>  	err = kvmppc_mmu_init(vcpu);
>  	if (err < 0)
> -		goto uninit_vcpu;
> +		goto free_shared_page;
>  
>  	return vcpu;
>  
> +free_shared_page:
> +	free_page((unsigned long)vcpu->arch.shared);
>  uninit_vcpu:
>  	kvm_vcpu_uninit(vcpu);
>  free_shadow_vcpu:

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^ permalink raw reply	[flat|nested] 51+ messages in thread

end of thread, back to index

Thread overview: 51+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-10-22  1:58 [PATCH 00/45] KVM: Refactor vCPU creation Sean Christopherson
2019-10-22  1:58 ` [PATCH 01/45] KVM: PPC: Book3S HV: Uninit vCPU if vcore creation fails Sean Christopherson
2019-10-24  7:04   ` Greg Kurz
2019-10-22  1:58 ` [PATCH 02/45] KVM: PPC: Book3S PR: Free shared page if mmu initialization fails Sean Christopherson
2019-10-24  7:05   ` Greg Kurz
2019-10-22  1:58 ` [PATCH 03/45] KVM: x86: Free wbinvd_dirty_mask if vCPU creation fails Sean Christopherson
2019-10-22  1:58 ` [PATCH 04/45] KVM: VMX: Allocate VPID after initializing VCPU Sean Christopherson
2019-10-22  1:58 ` [PATCH 05/45] KVM: VMX: Use direct vcpu pointer during vCPU create/free Sean Christopherson
2019-10-22  1:58 ` [PATCH 06/45] KVM: SVM: " Sean Christopherson
2019-10-22  1:58 ` [PATCH 07/45] KVM: x86: Allocate vcpu struct in common x86 code Sean Christopherson
2019-10-22  1:58 ` [PATCH 08/45] KVM: x86: Move FPU allocation to " Sean Christopherson
2019-10-22  1:58 ` [PATCH 09/45] KVM: x86: Move allocation of pio_data page down a few lines Sean Christopherson
2019-10-22  1:58 ` [PATCH 10/45] KVM: x86: Move kvm_vcpu_init() invocation to common code Sean Christopherson
2019-10-22  1:58 ` [PATCH 11/45] KVM: PPC: e500mc: Add build-time assert that vcpu is at offset 0 Sean Christopherson
2019-10-22  1:58 ` [PATCH 12/45] KVM: PPC: Allocate vcpu struct in common PPC code Sean Christopherson
2019-10-22  1:58 ` [PATCH 13/45] KVM: PPC: Book3S PR: Allocate book3s and shadow vcpu after common init Sean Christopherson
2019-10-22  1:58 ` [PATCH 14/45] KVM: PPC: e500mc: Move reset of oldpir below call to kvm_vcpu_init() Sean Christopherson
2019-10-22  1:58 ` [PATCH 15/45] KVM: PPC: Move kvm_vcpu_init() invocation to common code Sean Christopherson
2019-10-22  1:58 ` [PATCH 16/45] KVM: MIPS: Use kvm_vcpu_cache to allocate vCPUs Sean Christopherson
2019-10-22  1:58 ` [PATCH 17/45] KVM: MIPS: Drop kvm_arch_vcpu_free() Sean Christopherson
2019-10-22  1:58 ` [PATCH 18/45] KVM: PPC: " Sean Christopherson
2019-10-22  1:58 ` [PATCH 19/45] KVM: arm: " Sean Christopherson
2019-10-22  1:59 ` [PATCH 20/45] KVM: x86: Remove spurious kvm_mmu_unload() from vcpu destruction path Sean Christopherson
2019-10-22  1:59 ` [PATCH 21/45] KVM: x86: Remove spurious clearing of async #PF MSR Sean Christopherson
2019-10-22  1:59 ` [PATCH 22/45] KVM: x86: Drop kvm_arch_vcpu_free() Sean Christopherson
2019-10-22  1:59 ` [PATCH 23/45] KVM: Remove kvm_arch_vcpu_free() declaration Sean Christopherson
2019-10-22  1:59 ` [PATCH 24/45] KVM: Add kvm_arch_vcpu_precreate() to handle pre-allocation issues Sean Christopherson
2019-10-22  1:59 ` [PATCH 25/45] KVM: s390: Move guts of kvm_arch_vcpu_init() into kvm_arch_vcpu_create() Sean Christopherson
2019-10-22  1:59 ` [PATCH 26/45] KVM: s390: Invoke kvm_vcpu_init() before allocating sie_page Sean Christopherson
2019-10-22  1:59 ` [PATCH 27/45] KVM: MIPS: Invoke kvm_vcpu_uninit() immediately prior to freeing vcpu Sean Christopherson
2019-10-22  1:59 ` [PATCH 28/45] KVM: x86: " Sean Christopherson
2019-10-22  1:59 ` [PATCH 29/45] KVM: Introduce kvm_vcpu_destroy() Sean Christopherson
2019-10-22  1:59 ` [PATCH 30/45] KVM: Move vcpu alloc and init invocation to common code Sean Christopherson
2019-10-22  1:59 ` [PATCH 31/45] KVM: Unexport kvm_vcpu_cache and kvm_{un}init_vcpu() Sean Christopherson
2019-10-22  1:59 ` [PATCH 32/45] KVM: Move initialization of preempt notifier to kvm_vcpu_init() Sean Christopherson
2019-10-22  1:59 ` [PATCH 33/45] KVM: x86: Move guts of kvm_arch_vcpu_setup() into kvm_arch_vcpu_create() Sean Christopherson
2019-10-22  1:59 ` [PATCH 34/45] KVM: MIPS: Move .vcpu_setup() call to kvm_arch_vcpu_create() Sean Christopherson
2019-10-22  1:59 ` [PATCH 35/45] KVM: s390: Manually invoke vcpu setup during kvm_arch_vcpu_create() Sean Christopherson
2019-10-22  1:59 ` [PATCH 36/45] KVM: PPC: BookE: Setup vcpu during kvmppc_core_vcpu_create() Sean Christopherson
2019-10-22  1:59 ` [PATCH 37/45] KVM: Drop kvm_arch_vcpu_setup() Sean Christopherson
2019-10-22  1:59 ` [PATCH 38/45] KVM: x86: Move all vcpu init code into kvm_arch_vcpu_create() Sean Christopherson
2019-10-22  1:59 ` [PATCH 39/45] KVM: MIPS: " Sean Christopherson
2019-10-22  1:59 ` [PATCH 40/45] KVM: ARM: " Sean Christopherson
2019-10-22  1:59 ` [PATCH 41/45] KVM: PPC: " Sean Christopherson
2019-10-22  1:59 ` [PATCH 42/45] KVM: arm64: Free sve_state via arm specific hook Sean Christopherson
2019-10-22 11:43   ` Christoffer Dall
2019-10-22 18:41     ` Sean Christopherson
2019-10-22  1:59 ` [PATCH 43/45] KVM: Drop kvm_arch_vcpu_init() and kvm_arch_vcpu_uninit() Sean Christopherson
2019-10-22  1:59 ` [PATCH 44/45] KVM: Move putting of vcpu->pid to kvm_vcpu_destroy() Sean Christopherson
2019-10-22  1:59 ` [PATCH 45/45] KVM: Move vcpu->run page allocation out of kvm_vcpu_init() Sean Christopherson
2019-10-22 11:51 ` [PATCH 00/45] KVM: Refactor vCPU creation Christoffer Dall

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Archives are clonable:
	git clone --mirror https://lore.kernel.org/kvmarm/0 kvmarm/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 kvmarm kvmarm/ https://lore.kernel.org/kvmarm \
		kvmarm@lists.cs.columbia.edu
	public-inbox-index kvmarm

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/edu.columbia.cs.lists.kvmarm


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git