From: Roger Pau Monné <[email protected]>
Signed-off-by: Sergey Dyasli <[email protected]>
Signed-off-by: Roger Pau Monné <[email protected]>
Signed-off-by: Andrew Cooper <[email protected]>
---
xen/common/libx86/msr.c | 63 ++++++++++++++++++++++++++++++++++++++++++++
xen/include/xen/libx86/msr.h | 4 +++
2 files changed, 67 insertions(+)
diff --git a/xen/common/libx86/msr.c b/xen/common/libx86/msr.c
index 46a3458..13fb660 100644
--- a/xen/common/libx86/msr.c
+++ b/xen/common/libx86/msr.c
@@ -61,6 +61,69 @@ int x86_msr_copy_to_buffer(const struct msr_domain_policy
*dp,
}
/*
+ * Copy MSR data from a buffer, filling optionally msr_domain_policy and
+ * msr_vcpu_policy objects. MSR indicies are checked for being in range, but
+ * no content validation is performed for in-range MSRs.
+ */
+int x86_msr_copy_from_buffer(struct msr_domain_policy *dp,
+ struct msr_vcpu_policy *vp,
+ const msr_entry_buffer_t msrs, uint32_t nr_msrs,
+ uint32_t *err_msr)
+{
+ unsigned int i;
+ xen_msr_entry_t data;
+
+ if ( nr_msrs > MSR_MAX_SERIALISED_ENTRIES )
+ return -E2BIG;
+
+ for ( i = 0; i < nr_msrs; i++ )
+ {
+ if ( copy_from_buffer_offset(&data, msrs, i, 1) )
+ return -EFAULT;
+
+ if ( data.flags ) /* .flags MBZ */
+ goto err;
+
+ switch ( data.idx )
+ {
+ case MSR_SPEC_CTRL:
+ if ( data.val > ~0u )
+ goto err;
+
+ if ( vp )
+ vp->spec_ctrl.raw = data.val;
+ break;
+
+ case MSR_INTEL_PLATFORM_INFO:
+ if ( data.val > ~0u )
+ goto err;
+
+ if ( dp )
+ dp->plaform_info.raw = data.val;
+ break;
+
+ case MSR_INTEL_MISC_FEATURES_ENABLES:
+ if ( data.val > ~0u )
+ goto err;
+
+ if ( vp )
+ vp->misc_features_enables.raw = data.val;
+ break;
+
+ default:
+ goto err;
+ }
+ }
+
+ return 0;
+
+ err:
+ if ( err_msr )
+ *err_msr = data.idx;
+ return -EINVAL;
+}
+
+/*
* Local variables:
* mode: C
* c-file-style: "BSD"
diff --git a/xen/include/xen/libx86/msr.h b/xen/include/xen/libx86/msr.h
index 8776378..827eb3f 100644
--- a/xen/include/xen/libx86/msr.h
+++ b/xen/include/xen/libx86/msr.h
@@ -60,6 +60,10 @@ typedef xen_msr_entry_t *msr_entry_buffer_t;
int x86_msr_copy_to_buffer(const struct msr_domain_policy *dp,
const struct msr_vcpu_policy *vp,
msr_entry_buffer_t msrs, uint32_t *nr_entries_p);
+int x86_msr_copy_from_buffer(struct msr_domain_policy *dp,
+ struct msr_vcpu_policy *vp,
+ const msr_entry_buffer_t msrs, uint32_t nr_msrs,
+ uint32_t *err_msr);
#endif /* !XEN_LIBX86_MSR_H */
--
2.1.4
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