[PATCH v5 05/11] viridian: extend init/deinit hooks into synic and time modules

[Paul Durrant <paul.durrant@citrix.com>]

This patch simply adds domain and vcpu init/deinit hooks into the synic
and time modules and wires them into viridian_[domain|vcpu]_[init|deinit]().
Only one of the hooks is currently needed (to unmap the 'VP Assist' page)
but subsequent patches will make use of the others.

NOTE: To perform the unmap of the VP Assist page,
      viridian_unmap_guest_page() is now directly called in the new
      viridian_synic_vcpu_deinit() function (which is safe even if
      is_viridian_vcpu() evaluates to false). This replaces the slightly
      hacky mechanism of faking a zero write to the
      HV_X64_MSR_VP_ASSIST_PAGE MSR in viridian_cpu_deinit().

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
---
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: "Roger Pau Monné" <roger.pau@citrix.com>

v4:
 - Constify vcpu and domain pointers

v2:
 - Pay attention to sync and time init hook return values
---
 xen/arch/x86/hvm/viridian/private.h  | 12 +++++++++
 xen/arch/x86/hvm/viridian/synic.c    | 19 ++++++++++++++
 xen/arch/x86/hvm/viridian/time.c     | 18 ++++++++++++++
 xen/arch/x86/hvm/viridian/viridian.c | 37 ++++++++++++++++++++++++++--
 4 files changed, 84 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/hvm/viridian/private.h b/xen/arch/x86/hvm/viridian/private.h
index 46174f48cd..8c029f62c6 100644
--- a/xen/arch/x86/hvm/viridian/private.h
+++ b/xen/arch/x86/hvm/viridian/private.h
@@ -74,6 +74,12 @@
 int viridian_synic_wrmsr(struct vcpu *v, uint32_t idx, uint64_t val);
 int viridian_synic_rdmsr(const struct vcpu *v, uint32_t idx, uint64_t *val);
 
+int viridian_synic_vcpu_init(const struct vcpu *v);
+int viridian_synic_domain_init(const struct domain *d);
+
+void viridian_synic_vcpu_deinit(const struct vcpu *v);
+void viridian_synic_domain_deinit(const struct domain *d);
+
 void viridian_synic_save_vcpu_ctxt(const struct vcpu *v,
                                    struct hvm_viridian_vcpu_context *ctxt);
 void viridian_synic_load_vcpu_ctxt(
@@ -82,6 +88,12 @@ void viridian_synic_load_vcpu_ctxt(
 int viridian_time_wrmsr(struct vcpu *v, uint32_t idx, uint64_t val);
 int viridian_time_rdmsr(const struct vcpu *v, uint32_t idx, uint64_t *val);
 
+int viridian_time_vcpu_init(const struct vcpu *v);
+int viridian_time_domain_init(const struct domain *d);
+
+void viridian_time_vcpu_deinit(const struct vcpu *v);
+void viridian_time_domain_deinit(const struct domain *d);
+
 void viridian_time_save_domain_ctxt(
     const struct domain *d, struct hvm_viridian_domain_context *ctxt);
 void viridian_time_load_domain_ctxt(
diff --git a/xen/arch/x86/hvm/viridian/synic.c b/xen/arch/x86/hvm/viridian/synic.c
index 05d971b365..4b00dbe1b3 100644
--- a/xen/arch/x86/hvm/viridian/synic.c
+++ b/xen/arch/x86/hvm/viridian/synic.c
@@ -146,6 +146,25 @@ int viridian_synic_rdmsr(const struct vcpu *v, uint32_t idx, uint64_t *val)
     return X86EMUL_OKAY;
 }
 
+int viridian_synic_vcpu_init(const struct vcpu *v)
+{
+    return 0;
+}
+
+int viridian_synic_domain_init(const struct domain *d)
+{
+    return 0;
+}
+
+void viridian_synic_vcpu_deinit(const struct vcpu *v)
+{
+    viridian_unmap_guest_page(&v->arch.hvm.viridian->vp_assist);
+}
+
+void viridian_synic_domain_deinit(const struct domain *d)
+{
+}
+
 void viridian_synic_save_vcpu_ctxt(const struct vcpu *v,
                                    struct hvm_viridian_vcpu_context *ctxt)
 {
diff --git a/xen/arch/x86/hvm/viridian/time.c b/xen/arch/x86/hvm/viridian/time.c
index 909a3fb9e3..48aca7e0ab 100644
--- a/xen/arch/x86/hvm/viridian/time.c
+++ b/xen/arch/x86/hvm/viridian/time.c
@@ -215,6 +215,24 @@ int viridian_time_rdmsr(const struct vcpu *v, uint32_t idx, uint64_t *val)
     return X86EMUL_OKAY;
 }
 
+int viridian_time_vcpu_init(const struct vcpu *v)
+{
+    return 0;
+}
+
+int viridian_time_domain_init(const struct domain *d)
+{
+    return 0;
+}
+
+void viridian_time_vcpu_deinit(const struct vcpu *v)
+{
+}
+
+void viridian_time_domain_deinit(const struct domain *d)
+{
+}
+
 void viridian_time_save_domain_ctxt(
     const struct domain *d, struct hvm_viridian_domain_context *ctxt)
 {
diff --git a/xen/arch/x86/hvm/viridian/viridian.c b/xen/arch/x86/hvm/viridian/viridian.c
index 1a20d68aaf..f9a509d918 100644
--- a/xen/arch/x86/hvm/viridian/viridian.c
+++ b/xen/arch/x86/hvm/viridian/viridian.c
@@ -418,22 +418,52 @@ int guest_rdmsr_viridian(const struct vcpu *v, uint32_t idx, uint64_t *val)
 
 int viridian_vcpu_init(struct vcpu *v)
 {
+    int rc;
+
     ASSERT(!v->arch.hvm.viridian);
     v->arch.hvm.viridian = xzalloc(struct viridian_vcpu);
     if ( !v->arch.hvm.viridian )
         return -ENOMEM;
 
+    rc = viridian_synic_vcpu_init(v);
+    if ( rc )
+        goto fail;
+
+    rc = viridian_time_vcpu_init(v);
+    if ( rc )
+        goto fail;
+
     return 0;
+
+ fail:
+    viridian_vcpu_deinit(v);
+
+    return rc;
 }
 
 int viridian_domain_init(struct domain *d)
 {
+    int rc;
+
     ASSERT(!d->arch.hvm.viridian);
     d->arch.hvm.viridian = xzalloc(struct viridian_domain);
     if ( !d->arch.hvm.viridian )
         return -ENOMEM;
 
+    rc = viridian_synic_domain_init(d);
+    if ( rc )
+        goto fail;
+
+    rc = viridian_time_domain_init(d);
+    if ( rc )
+        goto fail;
+
     return 0;
+
+ fail:
+    viridian_domain_deinit(d);
+
+    return rc;
 }
 
 void viridian_vcpu_deinit(struct vcpu *v)
@@ -441,8 +471,8 @@ void viridian_vcpu_deinit(struct vcpu *v)
     if ( !v->arch.hvm.viridian )
         return;
 
-    if ( is_viridian_vcpu(v) )
-        viridian_synic_wrmsr(v, HV_X64_MSR_VP_ASSIST_PAGE, 0);
+    viridian_time_vcpu_deinit(v);
+    viridian_synic_vcpu_deinit(v);
 
     XFREE(v->arch.hvm.viridian);
 }
@@ -457,6 +487,9 @@ void viridian_domain_deinit(struct domain *d)
     if ( !d->arch.hvm.viridian )
         return;
 
+    viridian_time_domain_deinit(d);
+    viridian_synic_domain_deinit(d);
+
     XFREE(d->arch.hvm.viridian);
 }
 
-- 
2.20.1


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