[PATCH 5/5] svm: implement INVLPG part of DecodeAssist

[Andre Przywara <andre.przywara@amd.com>]

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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 deocde
cycle.
Only useful with shadow paging.

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


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commit c89a3f986870176b2c178a28fce82e868160ee61
Author: Andre Przywara <andre.przywara@amd.com>
Date:   Sun Jul 25 15:09:44 2010 +0200

    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 deocde
    cycle.
    Only useful with shadow paging.
    
    Signed-off-by: Andre Przywara <andre.przywara@amd.com>

diff --git a/xen/arch/x86/hvm/svm/svm.c b/xen/arch/x86/hvm/svm/svm.c
index c406bd3..6b196b3 100644
--- a/xen/arch/x86/hvm/svm/svm.c
+++ b/xen/arch/x86/hvm/svm/svm.c
@@ -1939,7 +1939,10 @@ asmlinkage void svm_vmexit_handler(struct cpu_user_regs *regs)
 
     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;
 

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