[Xen-changelog] [xen staging] x86/vvmx: Unconditionally initialise vmxon_region_pa during vcpu construction

[patchbot@xxxxxxx]

commit 18cef4df8f8bd04a59a218e5f67e7896e43fd07d
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Thu Oct 25 14:40:11 2018 +0100
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Tue Oct 30 13:26:21 2018 +0000

    x86/vvmx: Unconditionally initialise vmxon_region_pa during vcpu 
construction
    
    This is a stopgap solution until the toolstack side of initialisation can be
    sorted out, but it does result in the nvmx_vcpu_in_vmx() predicate working
    correctly even when nested virt hasn't been enabled for the domain.
    
    Update nvmx_handle_vmx_insn() to include the in-vmx mode check (for all
    instructions other than VMXON) to complete the set of #UD checks.
    
    In addition, sanity check that the nested vmexit handler has worked 
correctly,
    and that we are only providing emulation of the VT-x instructions to L1
    guests.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vmx.c  |  2 ++
 xen/arch/x86/hvm/vmx/vvmx.c | 11 ++++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index 8d0e4b682c..a6e6dc6c45 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -429,6 +429,8 @@ static int vmx_vcpu_initialise(struct vcpu *v)
 
     INIT_LIST_HEAD(&v->arch.hvm.vmx.pi_blocking.list);
 
+    vcpu_2_nvmx(v).vmxon_region_pa = INVALID_PADDR;
+
     if ( (rc = vmx_create_vmcs(v)) != 0 )
     {
         dprintk(XENLOG_WARNING,
diff --git a/xen/arch/x86/hvm/vmx/vvmx.c b/xen/arch/x86/hvm/vmx/vvmx.c
index 7051eb3509..eb176c23ab 100644
--- a/xen/arch/x86/hvm/vmx/vvmx.c
+++ b/xen/arch/x86/hvm/vmx/vvmx.c
@@ -1987,7 +1987,8 @@ int nvmx_handle_vmx_insn(struct cpu_user_regs *regs, 
unsigned int exit_reason)
 
     if ( !(curr->arch.hvm.guest_cr[4] & X86_CR4_VMXE) ||
          !nestedhvm_enabled(curr->domain) ||
-         (vmx_guest_x86_mode(curr) < (hvm_long_mode_active(curr) ? 8 : 2)) )
+         (vmx_guest_x86_mode(curr) < (hvm_long_mode_active(curr) ? 8 : 2)) ||
+         (exit_reason != EXIT_REASON_VMXON && !nvmx_vcpu_in_vmx(curr)) )
     {
         hvm_inject_hw_exception(TRAP_invalid_op, X86_EVENT_NO_EC);
         return X86EMUL_EXCEPTION;
@@ -1999,6 +2000,14 @@ int nvmx_handle_vmx_insn(struct cpu_user_regs *regs, 
unsigned int exit_reason)
         return X86EMUL_EXCEPTION;
     }
 
+    if ( nestedhvm_vcpu_in_guestmode(curr) )
+    {
+        /* Should have been handled by nvmx_n2_vmexit_handler()... */
+        ASSERT_UNREACHABLE();
+        domain_crash(curr->domain);
+        return X86EMUL_UNHANDLEABLE;
+    }
+
     switch ( exit_reason )
     {
     case EXIT_REASON_VMXOFF:
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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