Re: [Qemu-devel] [QEMU PATCH v3 1/9] KVM: Introduce kvm_arch_destroy_vcpu()

[Maran Wilson <maran.wilson@oracle.com>]

On 6/17/2019 10:56 AM, Liran Alon wrote:
> Simiar to how kvm_init_vcpu() calls kvm_arch_init_vcpu() to perform
> arch-dependent initialisation, introduce kvm_arch_destroy_vcpu()
> to be called from kvm_destroy_vcpu() to perform arch-dependent
> destruction.
>
> This was added because some architectures (Such as i386)
> currently do not free memory that it have allocated in
> kvm_arch_init_vcpu().
>
> Suggested-by: Maran Wilson <maran.wilson@oracle.com>
> Signed-off-by: Liran Alon <liran.alon@oracle.com>
> ---
>   accel/kvm/kvm-all.c  |  5 +++++
>   include/sysemu/kvm.h |  1 +
>   target/arm/kvm32.c   |  5 +++++
>   target/arm/kvm64.c   |  5 +++++
>   target/i386/kvm.c    | 12 ++++++++++++
>   target/mips/kvm.c    |  5 +++++
>   target/ppc/kvm.c     |  5 +++++
>   target/s390x/kvm.c   | 10 ++++++++++
>   8 files changed, 48 insertions(+)
>
> diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
> index 524c4ddfbd0f..59a3aa3a40da 100644
> --- a/accel/kvm/kvm-all.c
> +++ b/accel/kvm/kvm-all.c
> @@ -292,6 +292,11 @@ int kvm_destroy_vcpu(CPUState *cpu)
>   
>       DPRINTF("kvm_destroy_vcpu\n");
>   
> +    ret = kvm_arch_destroy_vcpu(cpu);
> +    if (ret < 0) {
> +        goto err;
> +    }
> +
>       mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
>       if (mmap_size < 0) {
>           ret = mmap_size;
> diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
> index a6d1cd190fed..64f55e519df7 100644
> --- a/include/sysemu/kvm.h
> +++ b/include/sysemu/kvm.h
> @@ -371,6 +371,7 @@ int kvm_arch_put_registers(CPUState *cpu, int level);
>   int kvm_arch_init(MachineState *ms, KVMState *s);
>   
>   int kvm_arch_init_vcpu(CPUState *cpu);
> +int kvm_arch_destroy_vcpu(CPUState *cpu);
>   
>   bool kvm_vcpu_id_is_valid(int vcpu_id);
>   
> diff --git a/target/arm/kvm32.c b/target/arm/kvm32.c
> index 4e54e372a668..51f78f722b18 100644
> --- a/target/arm/kvm32.c
> +++ b/target/arm/kvm32.c
> @@ -240,6 +240,11 @@ int kvm_arch_init_vcpu(CPUState *cs)
>       return kvm_arm_init_cpreg_list(cpu);
>   }
>   
> +int kvm_arch_destroy_vcpu(CPUState *cs)
> +{
> +	return 0;
> +}
> +
>   typedef struct Reg {
>       uint64_t id;
>       int offset;
> diff --git a/target/arm/kvm64.c b/target/arm/kvm64.c
> index 998d21f399f4..22d19c9aec6f 100644
> --- a/target/arm/kvm64.c
> +++ b/target/arm/kvm64.c
> @@ -654,6 +654,11 @@ int kvm_arch_init_vcpu(CPUState *cs)
>       return kvm_arm_init_cpreg_list(cpu);
>   }
>   
> +int kvm_arch_destroy_vcpu(CPUState *cs)
> +{
> +    return 0;
> +}
> +
>   bool kvm_arm_reg_syncs_via_cpreg_list(uint64_t regidx)
>   {
>       /* Return true if the regidx is a register we should synchronize
> diff --git a/target/i386/kvm.c b/target/i386/kvm.c
> index 3b29ce5c0d08..29889aa6b001 100644
> --- a/target/i386/kvm.c
> +++ b/target/i386/kvm.c
> @@ -1349,6 +1349,18 @@ int kvm_arch_init_vcpu(CPUState *cs)
>       return r;
>   }
>   
> +int kvm_arch_destroy_vcpu(CPUState *cs)
> +{
> +    X86CPU *cpu = X86_CPU(cs);
> +
> +    if (cpu->kvm_msr_buf) {
> +        g_free(cpu->kvm_msr_buf);
> +        cpu->kvm_msr_buf = NULL;
> +    }
> +
> +    return 0;
> +}
> +
>   void kvm_arch_reset_vcpu(X86CPU *cpu)
>   {
>       CPUX86State *env = &cpu->env;
> diff --git a/target/mips/kvm.c b/target/mips/kvm.c
> index 8e72850962e1..938f8f144b74 100644
> --- a/target/mips/kvm.c
> +++ b/target/mips/kvm.c
> @@ -91,6 +91,11 @@ int kvm_arch_init_vcpu(CPUState *cs)
>       return ret;
>   }
>   
> +int kvm_arch_destroy_vcpu(CPUState *cs)
> +{
> +    return 0;
> +}
> +
>   void kvm_mips_reset_vcpu(MIPSCPU *cpu)
>   {
>       CPUMIPSState *env = &cpu->env;
> diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c
> index 3bf0a46c3352..1967ccc51791 100644
> --- a/target/ppc/kvm.c
> +++ b/target/ppc/kvm.c
> @@ -521,6 +521,11 @@ int kvm_arch_init_vcpu(CPUState *cs)
>       return ret;
>   }
>   
> +int kvm_arch_destroy_vcpu(CPUState *cs)
> +{
> +    return 0;
> +}
> +
>   static void kvm_sw_tlb_put(PowerPCCPU *cpu)
>   {
>       CPUPPCState *env = &cpu->env;
> diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c
> index e5e2b691f253..c2747c31649b 100644
> --- a/target/s390x/kvm.c
> +++ b/target/s390x/kvm.c
> @@ -368,6 +368,16 @@ int kvm_arch_init_vcpu(CPUState *cs)
>       return 0;
>   }
>   
> +int kvm_arch_destroy_vcpu(CPUState *cs)
> +{
> +    S390CPU *cpu = S390_CPU(cs);
> +
> +    g_free(cpu->irqstate);
> +    cpu->irqstate = NULL;
> +
> +    return 0;
> +}
> +
>   void kvm_s390_reset_vcpu(S390CPU *cpu)
>   {
>       CPUState *cs = CPU(cpu);

Reviewed-by: Maran Wilson <maran.wilson@oracle.com>

Thanks,
-Maran