[v4,3/6] kvmppc: H_SVM_INIT_START and H_SVM_INIT_DONE hcalls
diff mbox series

Message ID 20190528064933.23119-4-bharata@linux.ibm.com
State Superseded
Headers show
Series
  • kvmppc: HMM driver to manage pages of secure guest
Related show

Commit Message

Bharata B Rao May 28, 2019, 6:49 a.m. UTC
H_SVM_INIT_START: Initiate securing a VM
H_SVM_INIT_DONE: Conclude securing a VM

As part of H_SVM_INIT_START register all existing memslots with the UV.
H_SVM_INIT_DONE call by UV informs HV that transition of the guest
to secure mode is complete.

Signed-off-by: Bharata B Rao <bharata@linux.ibm.com>
---
 arch/powerpc/include/asm/hvcall.h         |  2 ++
 arch/powerpc/include/asm/kvm_book3s_hmm.h | 12 ++++++++
 arch/powerpc/include/asm/kvm_host.h       |  4 +++
 arch/powerpc/include/asm/ultravisor-api.h |  1 +
 arch/powerpc/include/asm/ultravisor.h     |  9 ++++++
 arch/powerpc/kvm/book3s_hv.c              |  7 +++++
 arch/powerpc/kvm/book3s_hv_hmm.c          | 34 +++++++++++++++++++++++
 7 files changed, 69 insertions(+)

Comments

Paul Mackerras June 17, 2019, 5:37 a.m. UTC | #1
On Tue, May 28, 2019 at 12:19:30PM +0530, Bharata B Rao wrote:
> H_SVM_INIT_START: Initiate securing a VM
> H_SVM_INIT_DONE: Conclude securing a VM
> 
> As part of H_SVM_INIT_START register all existing memslots with the UV.
> H_SVM_INIT_DONE call by UV informs HV that transition of the guest
> to secure mode is complete.

It is worth mentioning here that setting any of the flag bits in
kvm->arch.secure_guest will cause the assembly code that enters the
guest to call the UV_RETURN ucall instead of trying to enter the guest
directly.  That's not necessarily obvious to the reader as this patch
doesn't touch that assembly code.

Apart from that this patch looks fine.

> Signed-off-by: Bharata B Rao <bharata@linux.ibm.com>

Acked-by: Paul Mackerras <paulus@ozlabs.org>
Thiago Jung Bauermann June 18, 2019, 11:05 p.m. UTC | #2
Hello Bharata,

Bharata B Rao <bharata@linux.ibm.com> writes:

> diff --git a/arch/powerpc/include/asm/kvm_book3s_hmm.h b/arch/powerpc/include/asm/kvm_book3s_hmm.h
> index 21f3de5f2acb..3e13dab7f690 100644
> --- a/arch/powerpc/include/asm/kvm_book3s_hmm.h
> +++ b/arch/powerpc/include/asm/kvm_book3s_hmm.h
> @@ -11,6 +11,8 @@ extern unsigned long kvmppc_h_svm_page_out(struct kvm *kvm,
>  					  unsigned long gra,
>  					  unsigned long flags,
>  					  unsigned long page_shift);
> +extern unsigned long kvmppc_h_svm_init_start(struct kvm *kvm);
> +extern unsigned long kvmppc_h_svm_init_done(struct kvm *kvm);
>  #else
>  static inline unsigned long
>  kvmppc_h_svm_page_in(struct kvm *kvm, unsigned long gra,
> @@ -25,5 +27,15 @@ kvmppc_h_svm_page_out(struct kvm *kvm, unsigned long gra,
>  {
>  	return H_UNSUPPORTED;
>  }
> +
> +static inine unsigned long kvmppc_h_svm_init_start(struct kvm *kvm)
> +{
> +	return H_UNSUPPORTED;
> +}
> +
> +static inine unsigned long kvmppc_h_svm_init_done(struct kvm *kvm);
> +{
> +	return H_UNSUPPORTED;
> +}
>  #endif /* CONFIG_PPC_UV */
>  #endif /* __POWERPC_KVM_PPC_HMM_H__ */

This patch won't build when CONFIG_PPC_UV isn't set because of two
typos: "inine" and the ';' at the end of kvmppc_h_svm_init_done()
function prototype.
Bharata B Rao July 9, 2019, 10:04 a.m. UTC | #3
On Mon, Jun 17, 2019 at 03:37:56PM +1000, Paul Mackerras wrote:
> On Tue, May 28, 2019 at 12:19:30PM +0530, Bharata B Rao wrote:
> > H_SVM_INIT_START: Initiate securing a VM
> > H_SVM_INIT_DONE: Conclude securing a VM
> > 
> > As part of H_SVM_INIT_START register all existing memslots with the UV.
> > H_SVM_INIT_DONE call by UV informs HV that transition of the guest
> > to secure mode is complete.
> 
> It is worth mentioning here that setting any of the flag bits in
> kvm->arch.secure_guest will cause the assembly code that enters the
> guest to call the UV_RETURN ucall instead of trying to enter the guest
> directly.  That's not necessarily obvious to the reader as this patch
> doesn't touch that assembly code.

Documented this in the commit message.

> 
> Apart from that this patch looks fine.
> 
> > Signed-off-by: Bharata B Rao <bharata@linux.ibm.com>
> 
> Acked-by: Paul Mackerras <paulus@ozlabs.org>

Thanks,
Bharata.
Bharata B Rao July 9, 2019, 10:05 a.m. UTC | #4
On Tue, Jun 18, 2019 at 08:05:26PM -0300, Thiago Jung Bauermann wrote:
> 
> Hello Bharata,
> 
> Bharata B Rao <bharata@linux.ibm.com> writes:
> 
> > diff --git a/arch/powerpc/include/asm/kvm_book3s_hmm.h b/arch/powerpc/include/asm/kvm_book3s_hmm.h
> > index 21f3de5f2acb..3e13dab7f690 100644
> > --- a/arch/powerpc/include/asm/kvm_book3s_hmm.h
> > +++ b/arch/powerpc/include/asm/kvm_book3s_hmm.h
> > @@ -11,6 +11,8 @@ extern unsigned long kvmppc_h_svm_page_out(struct kvm *kvm,
> >  					  unsigned long gra,
> >  					  unsigned long flags,
> >  					  unsigned long page_shift);
> > +extern unsigned long kvmppc_h_svm_init_start(struct kvm *kvm);
> > +extern unsigned long kvmppc_h_svm_init_done(struct kvm *kvm);
> >  #else
> >  static inline unsigned long
> >  kvmppc_h_svm_page_in(struct kvm *kvm, unsigned long gra,
> > @@ -25,5 +27,15 @@ kvmppc_h_svm_page_out(struct kvm *kvm, unsigned long gra,
> >  {
> >  	return H_UNSUPPORTED;
> >  }
> > +
> > +static inine unsigned long kvmppc_h_svm_init_start(struct kvm *kvm)
> > +{
> > +	return H_UNSUPPORTED;
> > +}
> > +
> > +static inine unsigned long kvmppc_h_svm_init_done(struct kvm *kvm);
> > +{
> > +	return H_UNSUPPORTED;
> > +}
> >  #endif /* CONFIG_PPC_UV */
> >  #endif /* __POWERPC_KVM_PPC_HMM_H__ */
> 
> This patch won't build when CONFIG_PPC_UV isn't set because of two
> typos: "inine" and the ';' at the end of kvmppc_h_svm_init_done()
> function prototype.

Thanks. Fixed this.

Regards,
Bharata.

Patch
diff mbox series

diff --git a/arch/powerpc/include/asm/hvcall.h b/arch/powerpc/include/asm/hvcall.h
index 05b8536f6653..fa7695928e30 100644
--- a/arch/powerpc/include/asm/hvcall.h
+++ b/arch/powerpc/include/asm/hvcall.h
@@ -343,6 +343,8 @@ 
 /* Platform-specific hcalls used by the Ultravisor */
 #define H_SVM_PAGE_IN		0xEF00
 #define H_SVM_PAGE_OUT		0xEF04
+#define H_SVM_INIT_START	0xEF08
+#define H_SVM_INIT_DONE		0xEF0C
 
 /* Values for 2nd argument to H_SET_MODE */
 #define H_SET_MODE_RESOURCE_SET_CIABR		1
diff --git a/arch/powerpc/include/asm/kvm_book3s_hmm.h b/arch/powerpc/include/asm/kvm_book3s_hmm.h
index 21f3de5f2acb..3e13dab7f690 100644
--- a/arch/powerpc/include/asm/kvm_book3s_hmm.h
+++ b/arch/powerpc/include/asm/kvm_book3s_hmm.h
@@ -11,6 +11,8 @@  extern unsigned long kvmppc_h_svm_page_out(struct kvm *kvm,
 					  unsigned long gra,
 					  unsigned long flags,
 					  unsigned long page_shift);
+extern unsigned long kvmppc_h_svm_init_start(struct kvm *kvm);
+extern unsigned long kvmppc_h_svm_init_done(struct kvm *kvm);
 #else
 static inline unsigned long
 kvmppc_h_svm_page_in(struct kvm *kvm, unsigned long gra,
@@ -25,5 +27,15 @@  kvmppc_h_svm_page_out(struct kvm *kvm, unsigned long gra,
 {
 	return H_UNSUPPORTED;
 }
+
+static inine unsigned long kvmppc_h_svm_init_start(struct kvm *kvm)
+{
+	return H_UNSUPPORTED;
+}
+
+static inine unsigned long kvmppc_h_svm_init_done(struct kvm *kvm);
+{
+	return H_UNSUPPORTED;
+}
 #endif /* CONFIG_PPC_UV */
 #endif /* __POWERPC_KVM_PPC_HMM_H__ */
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index c0c9c3455ac4..845fd2a73506 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -272,6 +272,10 @@  struct kvm_hpt_info {
 
 struct kvm_resize_hpt;
 
+/* Flag values for kvm_arch.secure_guest */
+#define KVMPPC_SECURE_INIT_START	0x1 /* H_SVM_INIT_START has been called */
+#define KVMPPC_SECURE_INIT_DONE		0x2 /* H_SVM_INIT_DONE completed */
+
 struct kvm_arch {
 	unsigned int lpid;
 	unsigned int smt_mode;		/* # vcpus per virtual core */
diff --git a/arch/powerpc/include/asm/ultravisor-api.h b/arch/powerpc/include/asm/ultravisor-api.h
index 51c4e0b5d197..05b17f4351f4 100644
--- a/arch/powerpc/include/asm/ultravisor-api.h
+++ b/arch/powerpc/include/asm/ultravisor-api.h
@@ -20,6 +20,7 @@ 
 /* opcodes */
 #define UV_WRITE_PATE			0xF104
 #define UV_RETURN			0xF11C
+#define UV_REGISTER_MEM_SLOT		0xF120
 #define UV_PAGE_IN			0xF128
 #define UV_PAGE_OUT			0xF12C
 
diff --git a/arch/powerpc/include/asm/ultravisor.h b/arch/powerpc/include/asm/ultravisor.h
index 1e4c51799b43..9befa6fea8db 100644
--- a/arch/powerpc/include/asm/ultravisor.h
+++ b/arch/powerpc/include/asm/ultravisor.h
@@ -61,6 +61,15 @@  static inline int uv_page_out(u64 lpid, u64 dst_ra, u64 src_gpa, u64 flags,
 	return ucall(UV_PAGE_OUT, retbuf, lpid, dst_ra, src_gpa, flags,
 		     page_shift);
 }
+
+static inline int uv_register_mem_slot(u64 lpid, u64 start_gpa, u64 size,
+				       u64 flags, u64 slotid)
+{
+	unsigned long retbuf[UCALL_BUFSIZE];
+
+	return ucall(UV_REGISTER_MEM_SLOT, retbuf, lpid, start_gpa,
+		     size, flags, slotid);
+}
 #endif /* !__ASSEMBLY__ */
 
 #endif	/* _ASM_POWERPC_ULTRAVISOR_H */
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 2918616198de..3683e517541f 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -1098,6 +1098,13 @@  int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
 					    kvmppc_get_gpr(vcpu, 5),
 					    kvmppc_get_gpr(vcpu, 6));
 		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;
 	}
diff --git a/arch/powerpc/kvm/book3s_hv_hmm.c b/arch/powerpc/kvm/book3s_hv_hmm.c
index 333829682f59..18fec814401d 100644
--- a/arch/powerpc/kvm/book3s_hv_hmm.c
+++ b/arch/powerpc/kvm/book3s_hv_hmm.c
@@ -55,6 +55,40 @@  struct kvmppc_hmm_migrate_args {
 	unsigned long page_shift;
 };
 
+unsigned long kvmppc_h_svm_init_start(struct kvm *kvm)
+{
+	struct kvm_memslots *slots;
+	struct kvm_memory_slot *memslot;
+	int ret = H_SUCCESS;
+	int srcu_idx;
+
+	srcu_idx = srcu_read_lock(&kvm->srcu);
+	slots = kvm_memslots(kvm);
+	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) {
+			ret = H_PARAMETER;
+			goto out;
+		}
+	}
+	kvm->arch.secure_guest |= KVMPPC_SECURE_INIT_START;
+out:
+	srcu_read_unlock(&kvm->srcu, srcu_idx);
+	return ret;
+}
+
+unsigned long kvmppc_h_svm_init_done(struct kvm *kvm)
+{
+	if (!(kvm->arch.secure_guest & KVMPPC_SECURE_INIT_START))
+		return H_UNSUPPORTED;
+
+	kvm->arch.secure_guest |= KVMPPC_SECURE_INIT_DONE;
+	return H_SUCCESS;
+}
+
 #define KVMPPC_PFN_HMM		(0x1ULL << 61)
 
 static inline bool kvmppc_is_hmm_pfn(unsigned long pfn)