[PATCH v4 07/10] x86/mm: add vmtrace_buf resource type

From: "Michał Leszczyński" <michal.leszczynski@cert.pl>
To: xen-devel@lists.xenproject.org
Cc: "Julien Grall" <julien@xen.org>,
	"Stefano Stabellini" <sstabellini@kernel.org>,
	tamas.lengyel@intel.com, "Wei Liu" <wl@xen.org>,
	"Andrew Cooper" <andrew.cooper3@citrix.com>,
	"Michal Leszczynski" <michal.leszczynski@cert.pl>,
	"Ian Jackson" <ian.jackson@eu.citrix.com>,
	"George Dunlap" <george.dunlap@citrix.com>,
	"Jan Beulich" <jbeulich@suse.com>,
	luwei.kang@intel.com, "Roger Pau Monné" <roger.pau@citrix.com>
Subject: [PATCH v4 07/10] x86/mm: add vmtrace_buf resource type
Date: Tue, 30 Jun 2020 14:33:50 +0200	[thread overview]
Message-ID: <2446caa5be5eca36f0b5ca47d2edcbd6f7792484.1593519420.git.michal.leszczynski@cert.pl> (raw)
In-Reply-To: <cover.1593519420.git.michal.leszczynski@cert.pl>
In-Reply-To: <cover.1593519420.git.michal.leszczynski@cert.pl>

From: Michal Leszczynski <michal.leszczynski@cert.pl>

Allow to map processor trace buffer using
acquire_resource().

Signed-off-by: Michal Leszczynski <michal.leszczynski@cert.pl>
---
 xen/arch/x86/mm.c           | 25 +++++++++++++++++++++++++
 xen/include/public/memory.h |  1 +
 2 files changed, 26 insertions(+)

diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index e376fc7e8f..bb781bd90c 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -4624,6 +4624,31 @@ int arch_acquire_resource(struct domain *d, unsigned int type,
         }
         break;
     }
+
+    case XENMEM_resource_vmtrace_buf:
+    {
+        mfn_t mfn;
+        unsigned int i;
+        struct vcpu *v = domain_vcpu(d, id);
+        rc = -EINVAL;
+
+        if ( !v )
+            break;
+
+        if ( !v->arch.vmtrace.pt_buf )
+            break;
+
+        mfn = page_to_mfn(v->arch.vmtrace.pt_buf);
+
+        if ( frame + nr_frames > (v->domain->vmtrace_pt_size >> PAGE_SHIFT) )
+            break;
+
+        rc = 0;
+        for ( i = 0; i < nr_frames; i++ )
+            mfn_list[i] = mfn_x(mfn_add(mfn, frame + i));
+
+        break;
+    }
 #endif
 
     default:
diff --git a/xen/include/public/memory.h b/xen/include/public/memory.h
index dbd35305df..f823c784c3 100644
--- a/xen/include/public/memory.h
+++ b/xen/include/public/memory.h
@@ -620,6 +620,7 @@ struct xen_mem_acquire_resource {
 
 #define XENMEM_resource_ioreq_server 0
 #define XENMEM_resource_grant_table 1
+#define XENMEM_resource_vmtrace_buf 2
 
     /*
      * IN - a type-specific resource identifier, which must be zero
-- 
2.20.1


