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Message-ID: <ee071807-5ce5-60c1-c5df-b0b3e068b2ba@redhat.com>
Date: Wed, 13 Jan 2021 13:53:39 +0100
From: Paolo Bonzini <pbonzini@...hat.com>
To: Jason Baron <jbaron@...mai.com>, kvm@...r.kernel.org
Cc: tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
peterz@...radead.org, aarcange@...hat.com, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] KVM: x86: introduce definitions to support static
calls for kvm_x86_ops
On 11/01/21 17:57, Jason Baron wrote:
> +#define DEFINE_KVM_OPS_STATIC_CALL(func) \
> + DEFINE_STATIC_CALL_NULL(kvm_x86_##func, \
> + *(((struct kvm_x86_ops *)0)->func))
> +#define DEFINE_KVM_OPS_STATIC_CALLS() \
> + FOREACH_KVM_X86_OPS(DEFINE_KVM_OPS_STATIC_CALL)
Something wrong here?
> +#define DECLARE_KVM_OPS_STATIC_CALL(func) \
> + DECLARE_STATIC_CALL(kvm_x86_##func, \
> + *(((struct kvm_x86_ops *)0)->func))
> +#define DECLARE_KVM_OPS_STATIC_CALLS() \
> + FOREACH_KVM_X86_OPS(DECLARE_KVM_OPS_STATIC_CALL)
> +
> +#define KVM_OPS_STATIC_CALL_UPDATE(func) \
> + static_call_update(kvm_x86_##func, kvm_x86_ops.func)
> +#define KVM_OPS_STATIC_CALL_UPDATES() \
> + FOREACH_KVM_X86_OPS(KVM_OPS_STATIC_CALL_UPDATE)
> +
> struct kvm_x86_ops {
> int (*hardware_enable)(void);
> void (*hardware_disable)(void);
> @@ -1326,6 +1385,12 @@ extern u64 __read_mostly host_efer;
> extern bool __read_mostly allow_smaller_maxphyaddr;
> extern struct kvm_x86_ops kvm_x86_ops;
>
> +DECLARE_KVM_OPS_STATIC_CALLS();
> +static inline void kvm_ops_static_call_update(void)
> +{
> + KVM_OPS_STATIC_CALL_UPDATES();
> +}
This would become
#define KVM_X86_OP(func) \
DECLARE_STATIC_CALL(kvm_x86_##func, \
*(((struct kvm_x86_ops *)0)->func));
#include <asm/kvm-x86-ops.h>
static inline void kvm_ops_static_call_update(void)
{
#define KVM_X86_OP(func) \
static_call_update(kvm_x86_##func, kvm_x86_ops.func)
#include <asm/kvm-x86-ops.h>
}
If you need to choose between DECLARE_STATIC_CALL_NULL and
DECLARE_STATIC_CALL, you can have kvm-x86-ops.h use one of two macros
KVM_X86_OP_NULL and KVM_X86_OP.
#define KVM_X86_OP(func) \
DECLARE_STATIC_CALL(kvm_x86_##func, \
*(((struct kvm_x86_ops *)0)->func));
#define KVM_X86_OP_NULL(func) \
DECLARE_STATIC_CALL_NULL(kvm_x86_##func, \
*(((struct kvm_x86_ops *)0)->func));
#include <asm/kvm-x86-ops.h>
...
#define KVM_X86_OP(func) \
static_call_update(kvm_x86_##func, kvm_x86_ops.func)
#define KVM_X86_OP_NULL(func) \
static_call_update(kvm_x86_##func, kvm_x86_ops.func)
#include <asm/kvm-x86-ops.h>
In that case vmx.c and svm.c could define KVM_X86_OP_NULL to an empty
string and list the optional callbacks manually.
Paolo
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