On Mon, Oct 22, 2018 at 10:48:36AM +0530, Bharata B Rao wrote:
> H_SVM_INIT_START: Initiate securing a VM
> H_SVM_INIT_DONE: Conclude securing a VM
>
> During early guest init, these hcalls will be issued by UV.
> As part of these hcalls, [un]register memslots with UV.
>
> Signed-off-by: Bharata B Rao <bhar...@linux.ibm.com>
Comments below...
> ---
> arch/powerpc/include/asm/hvcall.h | 4 ++-
> arch/powerpc/include/asm/kvm_host.h | 1 +
> arch/powerpc/include/asm/ucall-api.h | 6 ++++
> arch/powerpc/kvm/book3s_hv.c | 54 ++++++++++++++++++++++++++++
> 4 files changed, 64 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/include/asm/hvcall.h
> b/arch/powerpc/include/asm/hvcall.h
> index 89e6b70c1857..6091276fef07 100644
> --- a/arch/powerpc/include/asm/hvcall.h
> +++ b/arch/powerpc/include/asm/hvcall.h
> @@ -300,7 +300,9 @@
> #define H_INT_RESET 0x3D0
> #define H_SVM_PAGE_IN 0x3D4
> #define H_SVM_PAGE_OUT 0x3D8
> -#define MAX_HCALL_OPCODE H_SVM_PAGE_OUT
> +#define H_SVM_INIT_START 0x3DC
> +#define H_SVM_INIT_DONE 0x3E0
> +#define MAX_HCALL_OPCODE H_SVM_INIT_DONE
Same comments about hcall number assignments as for patch 1.
> /* H_VIOCTL functions */
> #define H_GET_VIOA_DUMP_SIZE 0x01
> diff --git a/arch/powerpc/include/asm/kvm_host.h
> b/arch/powerpc/include/asm/kvm_host.h
> index 194e6e0ff239..267f8c568bc3 100644
> --- a/arch/powerpc/include/asm/kvm_host.h
> +++ b/arch/powerpc/include/asm/kvm_host.h
> @@ -292,6 +292,7 @@ struct kvm_arch {
> struct dentry *debugfs_dir;
> struct dentry *htab_dentry;
> struct kvm_resize_hpt *resize_hpt; /* protected by kvm->lock */
> + bool svm_init_start; /* Indicates H_SVM_INIT_START has been called */
That doesn't seem like a good name for the field. How about just
'secure'?
> #endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */
> #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
> struct mutex hpt_mutex;
> diff --git a/arch/powerpc/include/asm/ucall-api.h
> b/arch/powerpc/include/asm/ucall-api.h
> index 2c12f514f8ab..9ddfcf541211 100644
> --- a/arch/powerpc/include/asm/ucall-api.h
> +++ b/arch/powerpc/include/asm/ucall-api.h
> @@ -17,4 +17,10 @@ static inline int uv_page_out(u64 lpid, u64 dw0, u64 dw1,
> u64 dw2, u64 dw3)
> return U_SUCCESS;
> }
>
> +static inline int uv_register_mem_slot(u64 lpid, u64 dw0, u64 dw1, u64 dw2,
> + u64 dw3)
> +{
> + return 0;
> +}
Please give the parameters descriptive names.
> +
> #endif /* _ASM_POWERPC_UCALL_API_H */
> diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
> index 05084eb8aadd..47f366f634fd 100644
> --- a/arch/powerpc/kvm/book3s_hv.c
> +++ b/arch/powerpc/kvm/book3s_hv.c
> @@ -819,6 +819,50 @@ static int kvmppc_get_yield_count(struct kvm_vcpu *vcpu)
> return yield_count;
> }
>
> +#ifdef CONFIG_PPC_SVM
> +#include <asm/ucall-api.h>
> +/*
> + * TODO: Check if memslots related calls here need to be called
> + * under any lock.
> + */
> +static unsigned long kvmppc_h_svm_init_start(struct kvm *kvm)
> +{
> + struct kvm_memslots *slots;
> + struct kvm_memory_slot *memslot;
> + int ret;
> +
> + slots = kvm_memslots(kvm);
I think you need the srcu read lock around this stuff.
> + kvm_for_each_memslot(memslot, slots) {
> + ret = uv_register_mem_slot(kvm->arch.lpid,
> + memslot->base_gfn << PAGE_SHIFT,
> + memslot->npages * PAGE_SIZE,
> + 0, memslot->id);
> + if (ret < 0)
> + return H_PARAMETER;
That doesn't seem like the right error code to use...
> + }
> + kvm->arch.svm_init_start = true;
> + return H_SUCCESS;
> +}
> +
> +static unsigned long kvmppc_h_svm_init_done(struct kvm *kvm)
> +{
> + if (kvm->arch.svm_init_start)
> + return H_SUCCESS;
> + else
> + return H_UNSUPPORTED;
> +}
> +#else
> +static unsigned long kvmppc_h_svm_init_start(struct kvm *kvm)
> +{
> + return H_UNSUPPORTED;
> +}
> +
> +static unsigned long kvmppc_h_svm_init_done(struct kvm *kvm)
> +{
> + return H_UNSUPPORTED;
> +}
> +#endif
> +
> int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
> {
> unsigned long req = kvmppc_get_gpr(vcpu, 3);
> @@ -950,6 +994,12 @@ int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
> kvmppc_get_gpr(vcpu, 6),
> kvmppc_get_gpr(vcpu, 7));
> break;
> + case H_SVM_INIT_START:
> + ret = kvmppc_h_svm_init_start(vcpu->kvm);
> + break;
> + case H_SVM_INIT_DONE:
> + ret = kvmppc_h_svm_init_done(vcpu->kvm);
> + break;
> default:
> return RESUME_HOST;
> }
> @@ -978,6 +1028,8 @@ static int kvmppc_hcall_impl_hv(unsigned long cmd)
> #endif
> case H_SVM_PAGE_IN:
> case H_SVM_PAGE_OUT:
> + case H_SVM_INIT_START:
> + case H_SVM_INIT_DONE:
> return 1;
> }
>
> @@ -4413,6 +4465,8 @@ static unsigned int default_hcall_list[] = {
> #endif
> H_SVM_PAGE_IN,
> H_SVM_PAGE_OUT,
> + H_SVM_INIT_START,
> + H_SVM_INIT_DONE,
> 0
> };
>
> --
> 2.17.1
Paul.
