KVM: SVM: Add intercept checks for descriptor table accesses

This patch add intercept checks into the KVM instruction
emulator to check for the 8 instructions that access the
descriptor table addresses.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index cd9ed9f..3ac830a 100644 (file)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2630,8 +2630,18 @@ static struct opcode group5[] = {
        D(SrcMem | ModRM | Stack), N,
 };
 
+static struct opcode group6[] = {
+       DI(ModRM | Prot,        sldt),
+       DI(ModRM | Prot,        str),
+       DI(ModRM | Prot | Priv, lldt),
+       DI(ModRM | Prot | Priv, ltr),
+       N, N, N, N,
+};
+
 static struct group_dual group7 = { {
-       N, N, DI(ModRM | SrcMem | Priv, lgdt), DI(ModRM | SrcMem | Priv, lidt),
+       DI(ModRM | Mov | DstMem | Priv, sgdt),
+       DI(ModRM | Mov | DstMem | Priv, sidt),
+       DI(ModRM | SrcMem | Priv, lgdt), DI(ModRM | SrcMem | Priv, lidt),
        DI(SrcNone | ModRM | DstMem | Mov, smsw), N,
        DI(SrcMem16 | ModRM | Mov | Priv, lmsw),
        DI(SrcMem | ModRM | ByteOp | Priv | NoAccess, invlpg),
@@ -2766,7 +2776,7 @@ static struct opcode opcode_table[256] = {
 
 static struct opcode twobyte_table[256] = {
        /* 0x00 - 0x0F */
-       N, GD(0, &group7), N, N,
+       G(0, group6), GD(0, &group7), N, N,
        N, D(ImplicitOps | VendorSpecific), DI(ImplicitOps | Priv, clts), N,
        DI(ImplicitOps | Priv, invd), DI(ImplicitOps | Priv, wbinvd), N, N,
        N, D(ImplicitOps | ModRM), N, N,

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 381b038..ce251c9 100644 (file)
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -3884,6 +3884,14 @@ static struct __x86_intercept {
        [x86_intercept_smsw]            = POST_EX(SVM_EXIT_READ_CR0),
        [x86_intercept_dr_read]         = POST_EX(SVM_EXIT_READ_DR0),
        [x86_intercept_dr_write]        = POST_EX(SVM_EXIT_WRITE_DR0),
+       [x86_intercept_sldt]            = POST_EX(SVM_EXIT_LDTR_READ),
+       [x86_intercept_str]             = POST_EX(SVM_EXIT_TR_READ),
+       [x86_intercept_lldt]            = POST_EX(SVM_EXIT_LDTR_WRITE),
+       [x86_intercept_ltr]             = POST_EX(SVM_EXIT_TR_WRITE),
+       [x86_intercept_sgdt]            = POST_EX(SVM_EXIT_GDTR_READ),
+       [x86_intercept_sidt]            = POST_EX(SVM_EXIT_IDTR_READ),
+       [x86_intercept_lgdt]            = POST_EX(SVM_EXIT_GDTR_WRITE),
+       [x86_intercept_lidt]            = POST_EX(SVM_EXIT_IDTR_WRITE),
 };
 
 #undef POST_EX