References: FATE#309900

# HG changeset patch
# User Christoph Egger <Christoph.Egger@amd.com>
# Date 1302700499 -3600
# Node ID 3b2182100ba2fa5c4a3a450e473717e2300aa8f1
# Parent  2284c79b606ac14ef5c5bc2c1cce62188b5bd9ee
x86/svm/asid: Introduce svm_invlpga()

Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>

# HG changeset patch
# User Andre Przywara <andre.przywara@amd.com>
# Date 1303117597 -3600
# Node ID e324c4d1dd6eeb9417fec513640ca795bd0f5dd4
# Parent  2c8ad607ece18b4740b9fc4ffe267a0e0893c141
svm: implement INVLPG part of DecodeAssist

Newer SVM implementations (Bulldozer) give the desired address on
a INVLPG intercept explicitly in the EXITINFO1 field of the VMCB.
Use this address to avoid a costly instruction fetch and decode
cycle.

Signed-off-by: Andre Przywara <andre.przywara@amd.com>

# HG changeset patch
# User Christoph Egger <Christoph.Egger@amd.com>
# Date 1305187246 -3600
# Node ID 19d6541c4abec3486c83de76102ec46d7fe22a16
# Parent  b6e8e916ed2827fb1329de0de2e23ee5b6b78662
nestedsvm: update rip on invlpga intercept

Fixes endless loop.

Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>

Index: xen-4.1.1-testing/xen/arch/x86/hvm/svm/emulate.c
===================================================================
--- xen-4.1.1-testing.orig/xen/arch/x86/hvm/svm/emulate.c
+++ xen-4.1.1-testing/xen/arch/x86/hvm/svm/emulate.c
@@ -102,6 +102,7 @@ MAKE_INSTR(INT3,   1, 0xcc);
 MAKE_INSTR(RDTSC,  2, 0x0f, 0x31);
 MAKE_INSTR(PAUSE,  1, 0x90);
 MAKE_INSTR(XSETBV, 3, 0x0f, 0x01, 0xd1);
+MAKE_INSTR(INVLPGA,3, 0x0f, 0x01, 0xdf);
 
 static const u8 *opc_bytes[INSTR_MAX_COUNT] = 
 {
@@ -116,6 +117,7 @@ static const u8 *opc_bytes[INSTR_MAX_COU
     [INSTR_RDTSC]  = OPCODE_RDTSC,
     [INSTR_PAUSE]  = OPCODE_PAUSE,
     [INSTR_XSETBV] = OPCODE_XSETBV,
+    [INSTR_INVLPGA] = OPCODE_INVLPGA,
 };
 
 static int fetch(struct vcpu *v, u8 *buf, unsigned long addr, int len)
Index: xen-4.1.1-testing/xen/arch/x86/hvm/svm/svm.c
===================================================================
--- xen-4.1.1-testing.orig/xen/arch/x86/hvm/svm/svm.c
+++ xen-4.1.1-testing/xen/arch/x86/hvm/svm/svm.c
@@ -1650,11 +1650,22 @@ asmlinkage void svm_vmexit_handler(struc
         break;
 
     case VMEXIT_INVLPG:
-    case VMEXIT_INVLPGA:
-        if ( !handle_mmio() )
+        if ( cpu_has_svm_decode )
+        {
+            svm_invlpg_intercept(vmcb->exitinfo1);
+            __update_guest_eip(regs, vmcb->nextrip - vmcb->rip);
+        }
+        else if ( !handle_mmio() )
             hvm_inject_exception(TRAP_gp_fault, 0, 0);
         break;
 
+    case VMEXIT_INVLPGA:
+        if ( (inst_len = __get_instruction_length(v, INSTR_INVLPGA)) == 0 )
+            break;
+        svm_invlpga(regs->eax, v->arch.hvm_vcpu.asid);
+        __update_guest_eip(regs, inst_len);
+        break;
+
     case VMEXIT_VMMCALL:
         if ( (inst_len = __get_instruction_length(v, INSTR_VMCALL)) == 0 )
             break;
Index: xen-4.1.1-testing/xen/include/asm-x86/hvm/svm/asid.h
===================================================================
--- xen-4.1.1-testing.orig/xen/include/asm-x86/hvm/svm/asid.h
+++ xen-4.1.1-testing/xen/include/asm-x86/hvm/svm/asid.h
@@ -34,10 +34,7 @@ static inline void svm_asid_g_invlpg(str
 {
 #if 0
     /* Optimization? */
-    asm volatile (".byte 0x0F,0x01,0xDF    \n"
-                  : /* output */
-                  : /* input */
-                  "a" (g_vaddr), "c"(v->arch.hvm_svm.vmcb->guest_asid) );
+    svm_invlpga(g_vaddr, v->arch.hvm_svm.vmcb->guest_asid);
 #endif
 
     /* Safe fallback. Take a new ASID. */
Index: xen-4.1.1-testing/xen/include/asm-x86/hvm/svm/emulate.h
===================================================================
--- xen-4.1.1-testing.orig/xen/include/asm-x86/hvm/svm/emulate.h
+++ xen-4.1.1-testing/xen/include/asm-x86/hvm/svm/emulate.h
@@ -33,6 +33,7 @@ enum instruction_index {
     INSTR_RDTSC,
     INSTR_PAUSE,
     INSTR_XSETBV,
+    INSTR_INVLPGA,
     INSTR_MAX_COUNT /* Must be last - Number of instructions supported */
 };
 
Index: xen-4.1.1-testing/xen/include/asm-x86/hvm/svm/svm.h
===================================================================
--- xen-4.1.1-testing.orig/xen/include/asm-x86/hvm/svm/svm.h
+++ xen-4.1.1-testing/xen/include/asm-x86/hvm/svm/svm.h
@@ -62,6 +62,15 @@ static inline void svm_vmsave(void *vmcb
         : : "a" (__pa(vmcb)) : "memory" );
 }
 
+static inline void svm_invlpga(unsigned long vaddr, uint32_t asid)
+{
+    asm volatile (
+        ".byte 0x0f,0x01,0xdf"
+        : /* output */
+        : /* input */
+        "a" (vaddr), "c" (asid));
+}
+
 extern u32 svm_feature_flags;
 
 #define SVM_FEATURE_NPT            0 /* Nested page table support */