diff mbox series

[V1,2/5] selftests: kvm: Introduce kvm_arch_main and helpers

Message ID 20220903012849.938069-3-vannapurve@google.com (mailing list archive)
State New
Headers show
Series Execute hypercalls from guests according to cpu type | expand

Commit Message

Vishal Annapurve Sept. 3, 2022, 1:28 a.m. UTC
Introduce following APIs:
1) kvm_arch_main : to be called at the startup of each test.
2) kvm_arch_post_vm_load: called after guest elf image is loaded into
   memory to populate any global state in guest memory.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Vishal Annapurve <vannapurve@google.com>
---
 tools/testing/selftests/kvm/include/kvm_util_base.h | 10 ++++++++++
 tools/testing/selftests/kvm/lib/aarch64/processor.c |  8 ++++++++
 tools/testing/selftests/kvm/lib/elf.c               |  2 ++
 tools/testing/selftests/kvm/lib/kvm_util.c          |  2 ++
 tools/testing/selftests/kvm/lib/riscv/processor.c   |  8 ++++++++
 tools/testing/selftests/kvm/lib/s390x/processor.c   |  8 ++++++++
 tools/testing/selftests/kvm/lib/x86_64/processor.c  |  8 ++++++++
 7 files changed, 46 insertions(+)

Comments

Andrew Jones Sept. 5, 2022, 7:46 a.m. UTC | #1
On Sat, Sep 03, 2022 at 01:28:46AM +0000, Vishal Annapurve wrote:
> Introduce following APIs:
> 1) kvm_arch_main : to be called at the startup of each test.

With this, AArch64 can move the content of its constructor,
init_guest_modes(), into kvm_arch_main(). Or, instead of the

 main()
 {
    /* common main stuff */
    kvm_arch_main();
    __main();
 }

approach we could have each arch provide a constructor

 arch_init()
 {
    common_pre_main_stuff();
    /* arch specific pre-main stuff */
 }

I personally prefer the latter.

Thanks,
drew

> 2) kvm_arch_post_vm_load: called after guest elf image is loaded into
>    memory to populate any global state in guest memory.
> 
> Suggested-by: Sean Christopherson <seanjc@google.com>
> Signed-off-by: Vishal Annapurve <vannapurve@google.com>
> ---
>  tools/testing/selftests/kvm/include/kvm_util_base.h | 10 ++++++++++
>  tools/testing/selftests/kvm/lib/aarch64/processor.c |  8 ++++++++
>  tools/testing/selftests/kvm/lib/elf.c               |  2 ++
>  tools/testing/selftests/kvm/lib/kvm_util.c          |  2 ++
>  tools/testing/selftests/kvm/lib/riscv/processor.c   |  8 ++++++++
>  tools/testing/selftests/kvm/lib/s390x/processor.c   |  8 ++++++++
>  tools/testing/selftests/kvm/lib/x86_64/processor.c  |  8 ++++++++
>  7 files changed, 46 insertions(+)
> 
> diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
> index 9e521d1c8afe..301bef6376a5 100644
> --- a/tools/testing/selftests/kvm/include/kvm_util_base.h
> +++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
> @@ -834,6 +834,16 @@ static inline int __vm_disable_nx_huge_pages(struct kvm_vm *vm)
>  	return __vm_enable_cap(vm, KVM_CAP_VM_DISABLE_NX_HUGE_PAGES, 0);
>  }
>  
> +/*
> + * API to execute architecture specific setup before executing selftest logic.
> + */
> +void kvm_arch_main(void);
> +
> +/*
> + * API to execute architecture specific setup after loading VMs.
> + */
> +void kvm_arch_post_vm_load(struct kvm_vm *vm);
> +
>  /*
>   * API to be implemented by all the selftests.
>   */
> diff --git a/tools/testing/selftests/kvm/lib/aarch64/processor.c b/tools/testing/selftests/kvm/lib/aarch64/processor.c
> index 6f5551368944..a7ca1947d574 100644
> --- a/tools/testing/selftests/kvm/lib/aarch64/processor.c
> +++ b/tools/testing/selftests/kvm/lib/aarch64/processor.c
> @@ -528,3 +528,11 @@ void smccc_hvc(uint32_t function_id, uint64_t arg0, uint64_t arg1,
>  		       [arg4] "r"(arg4), [arg5] "r"(arg5), [arg6] "r"(arg6)
>  		     : "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7");
>  }
> +
> +void kvm_arch_main(void)
> +{
> +}
> +
> +void kvm_arch_post_vm_load(struct kvm_vm *vm)
> +{
> +}
> diff --git a/tools/testing/selftests/kvm/lib/elf.c b/tools/testing/selftests/kvm/lib/elf.c
> index 9f54c098d9d0..f56f9279e703 100644
> --- a/tools/testing/selftests/kvm/lib/elf.c
> +++ b/tools/testing/selftests/kvm/lib/elf.c
> @@ -189,4 +189,6 @@ void kvm_vm_elf_load(struct kvm_vm *vm, const char *filename)
>  				phdr.p_filesz);
>  		}
>  	}
> +
> +	kvm_arch_post_vm_load(vm);
>  }
> diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> index 2e611a021c6e..b778dc684e30 100644
> --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> @@ -1985,6 +1985,8 @@ int main(int argc, char *argv[])
>  	/* Tell stdout not to buffer its content */
>  	setbuf(stdout, NULL);
>  
> +	kvm_arch_main();
> +
>  	__main(argc, argv);
>  
>  	return 0;
> diff --git a/tools/testing/selftests/kvm/lib/riscv/processor.c b/tools/testing/selftests/kvm/lib/riscv/processor.c
> index 604478151212..d992ad5b5771 100644
> --- a/tools/testing/selftests/kvm/lib/riscv/processor.c
> +++ b/tools/testing/selftests/kvm/lib/riscv/processor.c
> @@ -362,3 +362,11 @@ void vcpu_args_set(struct kvm_vcpu *vcpu, unsigned int num, ...)
>  void assert_on_unhandled_exception(struct kvm_vcpu *vcpu)
>  {
>  }
> +
> +void kvm_arch_main(void)
> +{
> +}
> +
> +void kvm_arch_post_vm_load(struct kvm_vm *vm)
> +{
> +}
> diff --git a/tools/testing/selftests/kvm/lib/s390x/processor.c b/tools/testing/selftests/kvm/lib/s390x/processor.c
> index 89d7340d9cbd..3a249783b3fe 100644
> --- a/tools/testing/selftests/kvm/lib/s390x/processor.c
> +++ b/tools/testing/selftests/kvm/lib/s390x/processor.c
> @@ -218,3 +218,11 @@ void vcpu_arch_dump(FILE *stream, struct kvm_vcpu *vcpu, uint8_t indent)
>  void assert_on_unhandled_exception(struct kvm_vcpu *vcpu)
>  {
>  }
> +
> +void kvm_arch_main(void)
> +{
> +}
> +
> +void kvm_arch_post_vm_load(struct kvm_vm *vm)
> +{
> +}
> diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c
> index 2e6e61bbe81b..e22cfc4bf284 100644
> --- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
> +++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
> @@ -1311,3 +1311,11 @@ bool vm_is_unrestricted_guest(struct kvm_vm *vm)
>  
>  	return val == 'Y';
>  }
> +
> +void kvm_arch_main(void)
> +{
> +}
> +
> +void kvm_arch_post_vm_load(struct kvm_vm *vm)
> +{
> +}
> -- 
> 2.37.2.789.g6183377224-goog
>
Vishal Annapurve Sept. 6, 2022, 10:46 p.m. UTC | #2
On Mon, Sep 5, 2022 at 12:46 AM Andrew Jones <andrew.jones@linux.dev> wrote:
>
> On Sat, Sep 03, 2022 at 01:28:46AM +0000, Vishal Annapurve wrote:
> > Introduce following APIs:
> > 1) kvm_arch_main : to be called at the startup of each test.
>
> With this, AArch64 can move the content of its constructor,
> init_guest_modes(), into kvm_arch_main(). Or, instead of the
>
>  main()
>  {
>     /* common main stuff */
>     kvm_arch_main();
>     __main();
>  }
>
> approach we could have each arch provide a constructor
>
>  arch_init()
>  {
>     common_pre_main_stuff();
>     /* arch specific pre-main stuff */
>  }
>
> I personally prefer the latter.
>

I agree with your suggestion of using constructors here. This will
help avoid changes in all the selftests.
Maybe I can add a common constructor that can invoke arch specific
init. I will add this change in the next series.

Thanks,
Vishal

> Thanks,
> drew
>
> > 2) kvm_arch_post_vm_load: called after guest elf image is loaded into
> >    memory to populate any global state in guest memory.
> >
> > Suggested-by: Sean Christopherson <seanjc@google.com>
> > Signed-off-by: Vishal Annapurve <vannapurve@google.com>
> > ---
> >  tools/testing/selftests/kvm/include/kvm_util_base.h | 10 ++++++++++
> >  tools/testing/selftests/kvm/lib/aarch64/processor.c |  8 ++++++++
> >  tools/testing/selftests/kvm/lib/elf.c               |  2 ++
> >  tools/testing/selftests/kvm/lib/kvm_util.c          |  2 ++
> >  tools/testing/selftests/kvm/lib/riscv/processor.c   |  8 ++++++++
> >  tools/testing/selftests/kvm/lib/s390x/processor.c   |  8 ++++++++
> >  tools/testing/selftests/kvm/lib/x86_64/processor.c  |  8 ++++++++
> >  7 files changed, 46 insertions(+)
> >
> > diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
> > index 9e521d1c8afe..301bef6376a5 100644
> > --- a/tools/testing/selftests/kvm/include/kvm_util_base.h
> > +++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
> > @@ -834,6 +834,16 @@ static inline int __vm_disable_nx_huge_pages(struct kvm_vm *vm)
> >       return __vm_enable_cap(vm, KVM_CAP_VM_DISABLE_NX_HUGE_PAGES, 0);
> >  }
> >
> > +/*
> > + * API to execute architecture specific setup before executing selftest logic.
> > + */
> > +void kvm_arch_main(void);
> > +
> > +/*
> > + * API to execute architecture specific setup after loading VMs.
> > + */
> > +void kvm_arch_post_vm_load(struct kvm_vm *vm);
> > +
> >  /*
> >   * API to be implemented by all the selftests.
> >   */
> > diff --git a/tools/testing/selftests/kvm/lib/aarch64/processor.c b/tools/testing/selftests/kvm/lib/aarch64/processor.c
> > index 6f5551368944..a7ca1947d574 100644
> > --- a/tools/testing/selftests/kvm/lib/aarch64/processor.c
> > +++ b/tools/testing/selftests/kvm/lib/aarch64/processor.c
> > @@ -528,3 +528,11 @@ void smccc_hvc(uint32_t function_id, uint64_t arg0, uint64_t arg1,
> >                      [arg4] "r"(arg4), [arg5] "r"(arg5), [arg6] "r"(arg6)
> >                    : "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7");
> >  }
> > +
> > +void kvm_arch_main(void)
> > +{
> > +}
> > +
> > +void kvm_arch_post_vm_load(struct kvm_vm *vm)
> > +{
> > +}
> > diff --git a/tools/testing/selftests/kvm/lib/elf.c b/tools/testing/selftests/kvm/lib/elf.c
> > index 9f54c098d9d0..f56f9279e703 100644
> > --- a/tools/testing/selftests/kvm/lib/elf.c
> > +++ b/tools/testing/selftests/kvm/lib/elf.c
> > @@ -189,4 +189,6 @@ void kvm_vm_elf_load(struct kvm_vm *vm, const char *filename)
> >                               phdr.p_filesz);
> >               }
> >       }
> > +
> > +     kvm_arch_post_vm_load(vm);
> >  }
> > diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> > index 2e611a021c6e..b778dc684e30 100644
> > --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> > +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> > @@ -1985,6 +1985,8 @@ int main(int argc, char *argv[])
> >       /* Tell stdout not to buffer its content */
> >       setbuf(stdout, NULL);
> >
> > +     kvm_arch_main();
> > +
> >       __main(argc, argv);
> >
> >       return 0;
> > diff --git a/tools/testing/selftests/kvm/lib/riscv/processor.c b/tools/testing/selftests/kvm/lib/riscv/processor.c
> > index 604478151212..d992ad5b5771 100644
> > --- a/tools/testing/selftests/kvm/lib/riscv/processor.c
> > +++ b/tools/testing/selftests/kvm/lib/riscv/processor.c
> > @@ -362,3 +362,11 @@ void vcpu_args_set(struct kvm_vcpu *vcpu, unsigned int num, ...)
> >  void assert_on_unhandled_exception(struct kvm_vcpu *vcpu)
> >  {
> >  }
> > +
> > +void kvm_arch_main(void)
> > +{
> > +}
> > +
> > +void kvm_arch_post_vm_load(struct kvm_vm *vm)
> > +{
> > +}
> > diff --git a/tools/testing/selftests/kvm/lib/s390x/processor.c b/tools/testing/selftests/kvm/lib/s390x/processor.c
> > index 89d7340d9cbd..3a249783b3fe 100644
> > --- a/tools/testing/selftests/kvm/lib/s390x/processor.c
> > +++ b/tools/testing/selftests/kvm/lib/s390x/processor.c
> > @@ -218,3 +218,11 @@ void vcpu_arch_dump(FILE *stream, struct kvm_vcpu *vcpu, uint8_t indent)
> >  void assert_on_unhandled_exception(struct kvm_vcpu *vcpu)
> >  {
> >  }
> > +
> > +void kvm_arch_main(void)
> > +{
> > +}
> > +
> > +void kvm_arch_post_vm_load(struct kvm_vm *vm)
> > +{
> > +}
> > diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c
> > index 2e6e61bbe81b..e22cfc4bf284 100644
> > --- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
> > +++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
> > @@ -1311,3 +1311,11 @@ bool vm_is_unrestricted_guest(struct kvm_vm *vm)
> >
> >       return val == 'Y';
> >  }
> > +
> > +void kvm_arch_main(void)
> > +{
> > +}
> > +
> > +void kvm_arch_post_vm_load(struct kvm_vm *vm)
> > +{
> > +}
> > --
> > 2.37.2.789.g6183377224-goog
> >
David Matlack Sept. 8, 2022, 9:21 p.m. UTC | #3
On Tue, Sep 06, 2022 at 03:46:20PM -0700, Vishal Annapurve wrote:
> On Mon, Sep 5, 2022 at 12:46 AM Andrew Jones <andrew.jones@linux.dev> wrote:
> >
> > On Sat, Sep 03, 2022 at 01:28:46AM +0000, Vishal Annapurve wrote:
> > > Introduce following APIs:
> > > 1) kvm_arch_main : to be called at the startup of each test.
> >
> > With this, AArch64 can move the content of its constructor,
> > init_guest_modes(), into kvm_arch_main(). Or, instead of the
> >
> >  main()
> >  {
> >     /* common main stuff */
> >     kvm_arch_main();
> >     __main();
> >  }
> >
> > approach we could have each arch provide a constructor
> >
> >  arch_init()
> >  {
> >     common_pre_main_stuff();
> >     /* arch specific pre-main stuff */
> >  }
> >
> > I personally prefer the latter.
> >
> 
> I agree with your suggestion of using constructors here. This will
> help avoid changes in all the selftests.
> Maybe I can add a common constructor that can invoke arch specific
> init. I will add this change in the next series.

In case anyone else is confused like me: "constructor" refers to
__attribute__ ((constructor)), which causes the function to run before
main().

I have a slight preference for having as few constructors as possible,
since they are somewhat subtle. So how about one constructor for all
selftests, e.g.:

void __attribute__ ((constructor)) kvm_selftest_init(void)
{
        /* Tell stdout not to buffer its content. */
        setbuf(stdout, NULL);

        kvm_selftest_arch_init();
}

Per-arch:

void kvm_selftest_arch_init(void)
{
        /* arch-specific pre-main stuff */
}
David Matlack Sept. 8, 2022, 9:27 p.m. UTC | #4
On Sat, Sep 03, 2022 at 01:28:46AM +0000, Vishal Annapurve wrote:
> Introduce following APIs:
> 1) kvm_arch_main : to be called at the startup of each test.
> 2) kvm_arch_post_vm_load: called after guest elf image is loaded into
>    memory to populate any global state in guest memory.

nit: Can you throw the post_vm_load in a separate commit? It's a
logically distinct change. Also suggest naming it
kvm_arch_post_vm_elf_load() to make it obvious it runs after
kvm_vm_elf_load().
Andrew Jones Sept. 9, 2022, 7:01 a.m. UTC | #5
On Thu, Sep 08, 2022 at 02:21:52PM -0700, David Matlack wrote:
> On Tue, Sep 06, 2022 at 03:46:20PM -0700, Vishal Annapurve wrote:
> > On Mon, Sep 5, 2022 at 12:46 AM Andrew Jones <andrew.jones@linux.dev> wrote:
> > >
> > > On Sat, Sep 03, 2022 at 01:28:46AM +0000, Vishal Annapurve wrote:
> > > > Introduce following APIs:
> > > > 1) kvm_arch_main : to be called at the startup of each test.
> > >
> > > With this, AArch64 can move the content of its constructor,
> > > init_guest_modes(), into kvm_arch_main(). Or, instead of the
> > >
> > >  main()
> > >  {
> > >     /* common main stuff */
> > >     kvm_arch_main();
> > >     __main();
> > >  }
> > >
> > > approach we could have each arch provide a constructor
> > >
> > >  arch_init()
> > >  {
> > >     common_pre_main_stuff();
> > >     /* arch specific pre-main stuff */
> > >  }
> > >
> > > I personally prefer the latter.
> > >
> > 
> > I agree with your suggestion of using constructors here. This will
> > help avoid changes in all the selftests.
> > Maybe I can add a common constructor that can invoke arch specific
> > init. I will add this change in the next series.
> 
> In case anyone else is confused like me: "constructor" refers to
> __attribute__ ((constructor)), which causes the function to run before
> main().
> 
> I have a slight preference for having as few constructors as possible,
> since they are somewhat subtle. So how about one constructor for all
> selftests, e.g.:
> 
> void __attribute__ ((constructor)) kvm_selftest_init(void)
> {
>         /* Tell stdout not to buffer its content. */
>         setbuf(stdout, NULL);
> 
>         kvm_selftest_arch_init();
> }
> 
> Per-arch:
> 
> void kvm_selftest_arch_init(void)
> {
>         /* arch-specific pre-main stuff */
> }

WFM and I think that's what Vishal was suggesting as well.

Thanks,
drew
Vishal Annapurve Sept. 14, 2022, 7:13 p.m. UTC | #6
On Fri, Sep 9, 2022 at 12:01 AM Andrew Jones <andrew.jones@linux.dev> wrote:
...
> >
> > void __attribute__ ((constructor)) kvm_selftest_init(void)
> > {
> >         /* Tell stdout not to buffer its content. */
> >         setbuf(stdout, NULL);
> >
> >         kvm_selftest_arch_init();
> > }
> >
> > Per-arch:
> >
> > void kvm_selftest_arch_init(void)
> > {
> >         /* arch-specific pre-main stuff */
> > }
>
> WFM and I think that's what Vishal was suggesting as well.
>

Yes, this matches with what I was suggesting. Planning to post this
update in the next series.

- Vishal

> Thanks,
> drew
diff mbox series

Patch

diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
index 9e521d1c8afe..301bef6376a5 100644
--- a/tools/testing/selftests/kvm/include/kvm_util_base.h
+++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
@@ -834,6 +834,16 @@  static inline int __vm_disable_nx_huge_pages(struct kvm_vm *vm)
 	return __vm_enable_cap(vm, KVM_CAP_VM_DISABLE_NX_HUGE_PAGES, 0);
 }
 
+/*
+ * API to execute architecture specific setup before executing selftest logic.
+ */
+void kvm_arch_main(void);
+
+/*
+ * API to execute architecture specific setup after loading VMs.
+ */
+void kvm_arch_post_vm_load(struct kvm_vm *vm);
+
 /*
  * API to be implemented by all the selftests.
  */
diff --git a/tools/testing/selftests/kvm/lib/aarch64/processor.c b/tools/testing/selftests/kvm/lib/aarch64/processor.c
index 6f5551368944..a7ca1947d574 100644
--- a/tools/testing/selftests/kvm/lib/aarch64/processor.c
+++ b/tools/testing/selftests/kvm/lib/aarch64/processor.c
@@ -528,3 +528,11 @@  void smccc_hvc(uint32_t function_id, uint64_t arg0, uint64_t arg1,
 		       [arg4] "r"(arg4), [arg5] "r"(arg5), [arg6] "r"(arg6)
 		     : "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7");
 }
+
+void kvm_arch_main(void)
+{
+}
+
+void kvm_arch_post_vm_load(struct kvm_vm *vm)
+{
+}
diff --git a/tools/testing/selftests/kvm/lib/elf.c b/tools/testing/selftests/kvm/lib/elf.c
index 9f54c098d9d0..f56f9279e703 100644
--- a/tools/testing/selftests/kvm/lib/elf.c
+++ b/tools/testing/selftests/kvm/lib/elf.c
@@ -189,4 +189,6 @@  void kvm_vm_elf_load(struct kvm_vm *vm, const char *filename)
 				phdr.p_filesz);
 		}
 	}
+
+	kvm_arch_post_vm_load(vm);
 }
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 2e611a021c6e..b778dc684e30 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -1985,6 +1985,8 @@  int main(int argc, char *argv[])
 	/* Tell stdout not to buffer its content */
 	setbuf(stdout, NULL);
 
+	kvm_arch_main();
+
 	__main(argc, argv);
 
 	return 0;
diff --git a/tools/testing/selftests/kvm/lib/riscv/processor.c b/tools/testing/selftests/kvm/lib/riscv/processor.c
index 604478151212..d992ad5b5771 100644
--- a/tools/testing/selftests/kvm/lib/riscv/processor.c
+++ b/tools/testing/selftests/kvm/lib/riscv/processor.c
@@ -362,3 +362,11 @@  void vcpu_args_set(struct kvm_vcpu *vcpu, unsigned int num, ...)
 void assert_on_unhandled_exception(struct kvm_vcpu *vcpu)
 {
 }
+
+void kvm_arch_main(void)
+{
+}
+
+void kvm_arch_post_vm_load(struct kvm_vm *vm)
+{
+}
diff --git a/tools/testing/selftests/kvm/lib/s390x/processor.c b/tools/testing/selftests/kvm/lib/s390x/processor.c
index 89d7340d9cbd..3a249783b3fe 100644
--- a/tools/testing/selftests/kvm/lib/s390x/processor.c
+++ b/tools/testing/selftests/kvm/lib/s390x/processor.c
@@ -218,3 +218,11 @@  void vcpu_arch_dump(FILE *stream, struct kvm_vcpu *vcpu, uint8_t indent)
 void assert_on_unhandled_exception(struct kvm_vcpu *vcpu)
 {
 }
+
+void kvm_arch_main(void)
+{
+}
+
+void kvm_arch_post_vm_load(struct kvm_vm *vm)
+{
+}
diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c
index 2e6e61bbe81b..e22cfc4bf284 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
@@ -1311,3 +1311,11 @@  bool vm_is_unrestricted_guest(struct kvm_vm *vm)
 
 	return val == 'Y';
 }
+
+void kvm_arch_main(void)
+{
+}
+
+void kvm_arch_post_vm_load(struct kvm_vm *vm)
+{
+}