[Xen-changelog] [xen staging] x86/vvmx: Drop the now-obsolete vmx_inst_check_privilege()

[patchbot@xxxxxxx]

commit 307ee30a1429e2f45d505c1299b58090edd81eb0
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Thu Oct 25 15:17:50 2018 +0100
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Tue Oct 30 13:26:21 2018 +0000

    x86/vvmx: Drop the now-obsolete vmx_inst_check_privilege()
    
    Now that nvmx_handle_vmx_insn() performs all VT-x instruction checks, there 
is
    no need for redundant checking in vmx_inst_check_privilege().  Remove it, 
and
    take out the vmxon_check boolean which was plumbed through 
decode_vmx_inst().
    
    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/vvmx.c | 75 ++++++---------------------------------------
 1 file changed, 10 insertions(+), 65 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vvmx.c b/xen/arch/x86/hvm/vmx/vvmx.c
index eb176c23ab..9fa2fe224e 100644
--- a/xen/arch/x86/hvm/vmx/vvmx.c
+++ b/xen/arch/x86/hvm/vmx/vvmx.c
@@ -377,48 +377,9 @@ static inline u32 __n2_secondary_exec_control(struct vcpu 
*v)
     return second_ctrl;
 }
 
-static int vmx_inst_check_privilege(struct cpu_user_regs *regs, int 
vmxop_check)
-{
-    struct vcpu *v = current;
-
-    if ( vmxop_check )
-    {
-        if ( !(v->arch.hvm.guest_cr[0] & X86_CR0_PE) ||
-             !(v->arch.hvm.guest_cr[4] & X86_CR4_VMXE) )
-            goto invalid_op;
-    }
-    else if ( !nvmx_vcpu_in_vmx(v) )
-        goto invalid_op;
-
-    if ( vmx_guest_x86_mode(v) < (hvm_long_mode_active(v) ? 8 : 2) )
-        goto invalid_op;
-    else if ( nestedhvm_vcpu_in_guestmode(v) )
-        goto vmexit;
-
-    if ( vmx_get_cpl() > 0 )
-        goto gp_fault;
-
-    return X86EMUL_OKAY;
-
-vmexit:
-    gdprintk(XENLOG_ERR, "vmx_inst_check_privilege: vmexit\n");
-    vcpu_nestedhvm(v).nv_vmexit_pending = 1;
-    return X86EMUL_EXCEPTION;
-    
-invalid_op:
-    gdprintk(XENLOG_ERR, "vmx_inst_check_privilege: invalid_op\n");
-    hvm_inject_hw_exception(TRAP_invalid_op, X86_EVENT_NO_EC);
-    return X86EMUL_EXCEPTION;
-
-gp_fault:
-    gdprintk(XENLOG_ERR, "vmx_inst_check_privilege: gp_fault\n");
-    hvm_inject_hw_exception(TRAP_gp_fault, 0);
-    return X86EMUL_EXCEPTION;
-}
-
 static int decode_vmx_inst(struct cpu_user_regs *regs,
                            struct vmx_inst_decoded *decode,
-                           unsigned long *poperandS, int vmxon_check)
+                           unsigned long *poperandS)
 {
     struct vcpu *v = current;
     union vmx_inst_info info;
@@ -426,9 +387,6 @@ static int decode_vmx_inst(struct cpu_user_regs *regs,
     unsigned long base, index, seg_base, disp, offset;
     int scale, size;
 
-    if ( vmx_inst_check_privilege(regs, vmxon_check) != X86EMUL_OKAY )
-        return X86EMUL_EXCEPTION;
-
     __vmread(VMX_INSTRUCTION_INFO, &offset);
     info.word = offset;
 
@@ -1480,7 +1438,7 @@ static int nvmx_handle_vmxon(struct cpu_user_regs *regs)
     uint32_t nvmcs_revid;
     int rc;
 
-    rc = decode_vmx_inst(regs, &decode, &gpa, 1);
+    rc = decode_vmx_inst(regs, &decode, &gpa);
     if ( rc != X86EMUL_OKAY )
         return rc;
 
@@ -1526,11 +1484,6 @@ static int nvmx_handle_vmxoff(struct cpu_user_regs *regs)
 {
     struct vcpu *v=current;
     struct nestedvmx *nvmx = &vcpu_2_nvmx(v);
-    int rc;
-
-    rc = vmx_inst_check_privilege(regs, 0);
-    if ( rc != X86EMUL_OKAY )
-        return rc;
 
     nvmx_purge_vvmcs(v);
     nvmx->vmxon_region_pa = INVALID_PADDR;
@@ -1617,10 +1570,6 @@ static int nvmx_handle_vmresume(struct cpu_user_regs 
*regs)
     struct vcpu *v = current;
     struct nestedvmx *nvmx = &vcpu_2_nvmx(v);
     unsigned long intr_shadow;
-    int rc = vmx_inst_check_privilege(regs, 0);
-
-    if ( rc != X86EMUL_OKAY )
-        return rc;
 
     if ( vcpu_nestedhvm(v).nv_vvmcxaddr == INVALID_PADDR )
     {
@@ -1651,10 +1600,7 @@ static int nvmx_handle_vmlaunch(struct cpu_user_regs 
*regs)
     struct vcpu *v = current;
     struct nestedvmx *nvmx = &vcpu_2_nvmx(v);
     unsigned long intr_shadow;
-    int rc = vmx_inst_check_privilege(regs, 0);
-
-    if ( rc != X86EMUL_OKAY )
-        return rc;
+    int rc;
 
     if ( vcpu_nestedhvm(v).nv_vvmcxaddr == INVALID_PADDR )
     {
@@ -1696,7 +1642,7 @@ static int nvmx_handle_vmptrld(struct cpu_user_regs *regs)
     unsigned long gpa = 0;
     int rc;
 
-    rc = decode_vmx_inst(regs, &decode, &gpa, 0);
+    rc = decode_vmx_inst(regs, &decode, &gpa);
     if ( rc != X86EMUL_OKAY )
         return rc;
 
@@ -1768,7 +1714,7 @@ static int nvmx_handle_vmptrst(struct cpu_user_regs *regs)
     unsigned long gpa = 0;
     int rc;
 
-    rc = decode_vmx_inst(regs, &decode, &gpa, 0);
+    rc = decode_vmx_inst(regs, &decode, &gpa);
     if ( rc != X86EMUL_OKAY )
         return rc;
 
@@ -1794,7 +1740,7 @@ static int nvmx_handle_vmclear(struct cpu_user_regs *regs)
     void *vvmcs;
     int rc;
 
-    rc = decode_vmx_inst(regs, &decode, &gpa, 0);
+    rc = decode_vmx_inst(regs, &decode, &gpa);
     if ( rc != X86EMUL_OKAY )
         return rc;
 
@@ -1844,7 +1790,7 @@ static int nvmx_handle_vmread(struct cpu_user_regs *regs)
     u64 value = 0;
     int rc;
 
-    rc = decode_vmx_inst(regs, &decode, NULL, 0);
+    rc = decode_vmx_inst(regs, &decode, NULL);
     if ( rc != X86EMUL_OKAY )
         return rc;
 
@@ -1887,8 +1833,7 @@ static int nvmx_handle_vmwrite(struct cpu_user_regs *regs)
     bool_t okay = 1;
     enum vmx_insn_errno err;
 
-    if ( decode_vmx_inst(regs, &decode, &operand, 0)
-             != X86EMUL_OKAY )
+    if ( decode_vmx_inst(regs, &decode, &operand) != X86EMUL_OKAY )
         return X86EMUL_EXCEPTION;
 
     if ( vcpu_nestedhvm(v).nv_vvmcxaddr == INVALID_PADDR )
@@ -1932,7 +1877,7 @@ static int nvmx_handle_invept(struct cpu_user_regs *regs)
     unsigned long eptp;
     int ret;
 
-    if ( (ret = decode_vmx_inst(regs, &decode, &eptp, 0)) != X86EMUL_OKAY )
+    if ( (ret = decode_vmx_inst(regs, &decode, &eptp)) != X86EMUL_OKAY )
         return ret;
 
     switch ( reg_read(regs, decode.reg2) )
@@ -1960,7 +1905,7 @@ static int nvmx_handle_invvpid(struct cpu_user_regs *regs)
     unsigned long vpid;
     int ret;
 
-    if ( (ret = decode_vmx_inst(regs, &decode, &vpid, 0)) != X86EMUL_OKAY )
+    if ( (ret = decode_vmx_inst(regs, &decode, &vpid)) != X86EMUL_OKAY )
         return ret;
 
     switch ( reg_read(regs, decode.reg2) )
--
generated by git-patchbot for /home/xen/git/xen.git#staging

_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/xen-changelog