[Xen-devel] [PATCH for-next v2] x86/svm: Correct vm_event API for descriptor accesses

Andrew Cooper posted 1 patch 1 week ago
Patches applied successfully (tree, apply log)
git fetch https://github.com/patchew-project/xen tags/patchew/20191129172016.30689-1-andrew.cooper3@citrix.com
xen/arch/x86/hvm/monitor.c    |  4 ----
xen/arch/x86/hvm/svm/svm.c    | 37 +++++++++++++++++--------------------
xen/include/public/vm_event.h |  6 +-----
3 files changed, 18 insertions(+), 29 deletions(-)

[Xen-devel] [PATCH for-next v2] x86/svm: Correct vm_event API for descriptor accesses

Posted by Andrew Cooper 1 week ago
c/s d0a699a389f1 "x86/monitor: add support for descriptor access events"
introduced logic looking for what appeared to be exitinfo (not that this
exists in SVM - exitinfo1 or 2 do), but actually passed the exit IDT vectoring
information.  There is never any IDT vectoring involved in these intercepts so
the value passed is always zero.

In fact, SVM doesn't provide any information, even in exitinfo1 and 2.  Drop
the svm struct entirely, and bump the interface version.

In the SVM vmexit handler itself, optimise the switch statement by observing
that there is a linear transformation between the SVM exit_reason and
VM_EVENT_DESC_* values.  (Bloat-o-meter reports 6028 => 5877 for a saving of
151 bytes).

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Razvan Cojocaru <rcojocaru@bitdefender.com>
Reviewed-by: Alexandru Isaila <aisaila@bitdefender.com>
Acked-by: Adrian Pop <apop@bitdefender.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
---
CC: Jan Beulich <JBeulich@suse.com>
CC: Wei Liu <wl@xen.org>
CC: Roger Pau Monné <roger.pau@citrix.com>
CC: Razvan Cojocaru <rcojocaru@bitdefender.com>
CC: Tamas K Lengyel <tamas@tklengyel.com>
CC: Alexandru Isaila <aisaila@bitdefender.com>
CC: Petre Pircalabu <ppircalabu@bitdefender.com>
CC: Adrian Pop <apop@bitdefender.com>

v2:
 * Drop the svm struct and bump the interface version.
---
 xen/arch/x86/hvm/monitor.c    |  4 ----
 xen/arch/x86/hvm/svm/svm.c    | 37 +++++++++++++++++--------------------
 xen/include/public/vm_event.h |  6 +-----
 3 files changed, 18 insertions(+), 29 deletions(-)

diff --git a/xen/arch/x86/hvm/monitor.c b/xen/arch/x86/hvm/monitor.c
index 7fb1e2c04e..1f23fe25e8 100644
--- a/xen/arch/x86/hvm/monitor.c
+++ b/xen/arch/x86/hvm/monitor.c
@@ -113,10 +113,6 @@ void hvm_monitor_descriptor_access(uint64_t exit_info,
         req.u.desc_access.arch.vmx.instr_info = exit_info;
         req.u.desc_access.arch.vmx.exit_qualification = vmx_exit_qualification;
     }
-    else
-    {
-        req.u.desc_access.arch.svm.exitinfo = exit_info;
-    }
 
     monitor_traps(current, true, &req);
 }
diff --git a/xen/arch/x86/hvm/svm/svm.c b/xen/arch/x86/hvm/svm/svm.c
index 0fb1908c18..776cf11459 100644
--- a/xen/arch/x86/hvm/svm/svm.c
+++ b/xen/arch/x86/hvm/svm/svm.c
@@ -2980,29 +2980,26 @@ void svm_vmexit_handler(struct cpu_user_regs *regs)
         svm_vmexit_do_pause(regs);
         break;
 
-    case VMEXIT_IDTR_READ:
-    case VMEXIT_IDTR_WRITE:
-        hvm_descriptor_access_intercept(vmcb->exitintinfo.bytes, 0,
-            VM_EVENT_DESC_IDTR, exit_reason == VMEXIT_IDTR_WRITE);
-        break;
-
-    case VMEXIT_GDTR_READ:
-    case VMEXIT_GDTR_WRITE:
-        hvm_descriptor_access_intercept(vmcb->exitintinfo.bytes, 0,
-            VM_EVENT_DESC_GDTR, exit_reason == VMEXIT_GDTR_WRITE);
-        break;
+    case VMEXIT_IDTR_READ ... VMEXIT_TR_WRITE:
+    {
+        /*
+         * Consecutive block of 8 exit codes (sadly not aligned).  Top bit
+         * indicates write (vs read), bottom 2 bits map linearly to
+         * VM_EVENT_DESC_* values.
+         */
+#define E2D(e)      ((((e)         - VMEXIT_IDTR_READ) & 3) + 1)
+        bool write = ((exit_reason - VMEXIT_IDTR_READ) & 4);
+        unsigned int desc = E2D(exit_reason);
 
-    case VMEXIT_LDTR_READ:
-    case VMEXIT_LDTR_WRITE:
-        hvm_descriptor_access_intercept(vmcb->exitintinfo.bytes, 0,
-            VM_EVENT_DESC_LDTR, exit_reason == VMEXIT_LDTR_WRITE);
-        break;
+        BUILD_BUG_ON(E2D(VMEXIT_IDTR_READ) != VM_EVENT_DESC_IDTR);
+        BUILD_BUG_ON(E2D(VMEXIT_GDTR_READ) != VM_EVENT_DESC_GDTR);
+        BUILD_BUG_ON(E2D(VMEXIT_LDTR_READ) != VM_EVENT_DESC_LDTR);
+        BUILD_BUG_ON(E2D(VMEXIT_TR_READ)   != VM_EVENT_DESC_TR);
+#undef E2D
 
-    case VMEXIT_TR_READ:
-    case VMEXIT_TR_WRITE:
-        hvm_descriptor_access_intercept(vmcb->exitintinfo.bytes, 0,
-            VM_EVENT_DESC_TR, exit_reason == VMEXIT_TR_WRITE);
+        hvm_descriptor_access_intercept(0, 0, desc, write);
         break;
+    }
 
     default:
     unexpected_exit_type:
diff --git a/xen/include/public/vm_event.h b/xen/include/public/vm_event.h
index 959083d8c4..aa54c86325 100644
--- a/xen/include/public/vm_event.h
+++ b/xen/include/public/vm_event.h
@@ -29,7 +29,7 @@
 
 #include "xen.h"
 
-#define VM_EVENT_INTERFACE_VERSION 0x00000005
+#define VM_EVENT_INTERFACE_VERSION 0x00000006
 
 #if defined(__XEN__) || defined(__XEN_TOOLS__)
 
@@ -301,10 +301,6 @@ struct vm_event_desc_access {
             uint32_t _pad1;
             uint64_t exit_qualification; /* VMX: VMCS Exit Qualification */
         } vmx;
-        struct {
-            uint64_t exitinfo;           /* SVM: VMCB EXITINFO */
-            uint64_t _pad2;
-        } svm;
     } arch;
     uint8_t descriptor;                  /* VM_EVENT_DESC_* */
     uint8_t is_write;
-- 
2.11.0


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