From: Joerg Roedel <joerg.roedel@amd.com>
Date: Mon, 4 Apr 2011 10:39:33 +0000 (+0200)
Subject: KVM: SVM: Add intercept checks for remaining twobyte instructions
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=8061252ee0d21e1289235a4b7fe61f53010c46ff;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

KVM: SVM: Add intercept checks for remaining twobyte instructions

This patch adds intercepts checks for the remaining twobyte
instructions to the KVM instruction emulator.

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

diff --git a/arch/x86/include/asm/kvm_emulate.h b/arch/x86/include/asm/kvm_emulate.h
index fdaf59ac1c0..f30650f0090 100644
--- a/arch/x86/include/asm/kvm_emulate.h
+++ b/arch/x86/include/asm/kvm_emulate.h
@@ -344,6 +344,8 @@ enum x86_intercept {
 	x86_intercept_wbinvd,
 	x86_intercept_monitor,
 	x86_intercept_mwait,
+	x86_intercept_rdmsr,
+	x86_intercept_wrmsr,
 
 	nr_x86_intercepts
 };
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index b4adb4cbb5f..0bf1f68a71c 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2425,12 +2425,9 @@ static int em_cwd(struct x86_emulate_ctxt *ctxt)
 
 static int em_rdtsc(struct x86_emulate_ctxt *ctxt)
 {
-	unsigned cpl = ctxt->ops->cpl(ctxt->vcpu);
 	struct decode_cache *c = &ctxt->decode;
 	u64 tsc = 0;
 
-	if (cpl > 0 && (ctxt->ops->get_cr(4, ctxt->vcpu) & X86_CR4_TSD))
-		return emulate_gp(ctxt, 0);
 	ctxt->ops->get_msr(ctxt->vcpu, MSR_IA32_TSC, &tsc);
 	c->regs[VCPU_REGS_RAX] = (u32)tsc;
 	c->regs[VCPU_REGS_RDX] = tsc >> 32;
@@ -2614,6 +2611,18 @@ static int check_rdtsc(struct x86_emulate_ctxt *ctxt)
 	return X86EMUL_CONTINUE;
 }
 
+static int check_rdpmc(struct x86_emulate_ctxt *ctxt)
+{
+	u64 cr4 = ctxt->ops->get_cr(4, ctxt->vcpu);
+	u64 rcx = kvm_register_read(ctxt->vcpu, VCPU_REGS_RCX);
+
+	if ((!(cr4 & X86_CR4_PCE) && ctxt->ops->cpl(ctxt->vcpu)) ||
+	    (rcx > 3))
+		return emulate_gp(ctxt, 0);
+
+	return X86EMUL_CONTINUE;
+}
+
 #define D(_y) { .flags = (_y) }
 #define DI(_y, _i) { .flags = (_y), .intercept = x86_intercept_##_i }
 #define DIP(_y, _i, _p) { .flags = (_y), .intercept = x86_intercept_##_i, \
@@ -2846,8 +2855,10 @@ static struct opcode twobyte_table[256] = {
 	N, N, N, N,
 	N, N, N, N, N, N, N, N,
 	/* 0x30 - 0x3F */
-	D(ImplicitOps | Priv), II(ImplicitOps, em_rdtsc, rdtsc),
-	D(ImplicitOps | Priv), N,
+	DI(ImplicitOps | Priv, wrmsr),
+	IIP(ImplicitOps, em_rdtsc, rdtsc, check_rdtsc),
+	DI(ImplicitOps | Priv, rdmsr),
+	DIP(ImplicitOps | Priv, rdpmc, check_rdpmc),
 	D(ImplicitOps | VendorSpecific), D(ImplicitOps | Priv | VendorSpecific),
 	N, N,
 	N, N, N, N, N, N, N, N,
@@ -2871,12 +2882,12 @@ static struct opcode twobyte_table[256] = {
 	X16(D(ByteOp | DstMem | SrcNone | ModRM| Mov)),
 	/* 0xA0 - 0xA7 */
 	D(ImplicitOps | Stack), D(ImplicitOps | Stack),
-	N, D(DstMem | SrcReg | ModRM | BitOp),
+	DI(ImplicitOps, cpuid), D(DstMem | SrcReg | ModRM | BitOp),
 	D(DstMem | SrcReg | Src2ImmByte | ModRM),
 	D(DstMem | SrcReg | Src2CL | ModRM), N, N,
 	/* 0xA8 - 0xAF */
 	D(ImplicitOps | Stack), D(ImplicitOps | Stack),
-	N, D(DstMem | SrcReg | ModRM | BitOp | Lock),
+	DI(ImplicitOps, rsm), D(DstMem | SrcReg | ModRM | BitOp | Lock),
 	D(DstMem | SrcReg | Src2ImmByte | ModRM),
 	D(DstMem | SrcReg | Src2CL | ModRM),
 	D(ModRM), I(DstReg | SrcMem | ModRM, em_imul),
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 1eb5504ca6f..90362892244 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -3868,6 +3868,9 @@ static void svm_fpu_deactivate(struct kvm_vcpu *vcpu)
 	update_cr0_intercept(svm);
 }
 
+#define PRE_EX(exit)  { .exit_code = (exit), \
+			.stage = X86_ICPT_PRE_EXCEPT, \
+			.valid = true }
 #define POST_EX(exit) { .exit_code = (exit), \
 			.stage = X86_ICPT_POST_EXCEPT, \
 			.valid = true }
@@ -3906,8 +3909,18 @@ static struct __x86_intercept {
 	[x86_intercept_rdtscp]		= POST_EX(SVM_EXIT_RDTSCP),
 	[x86_intercept_monitor]		= POST_MEM(SVM_EXIT_MONITOR),
 	[x86_intercept_mwait]		= POST_EX(SVM_EXIT_MWAIT),
+	[x86_intercept_invlpg]		= POST_EX(SVM_EXIT_INVLPG),
+	[x86_intercept_invd]		= POST_EX(SVM_EXIT_INVD),
+	[x86_intercept_wbinvd]		= POST_EX(SVM_EXIT_WBINVD),
+	[x86_intercept_wrmsr]		= POST_EX(SVM_EXIT_MSR),
+	[x86_intercept_rdtsc]		= POST_EX(SVM_EXIT_RDTSC),
+	[x86_intercept_rdmsr]		= POST_EX(SVM_EXIT_MSR),
+	[x86_intercept_rdpmc]		= POST_EX(SVM_EXIT_RDPMC),
+	[x86_intercept_cpuid]		= PRE_EX(SVM_EXIT_CPUID),
+	[x86_intercept_rsm]		= PRE_EX(SVM_EXIT_RSM),
 };
 
+#undef PRE_EX
 #undef POST_EX
 #undef POST_MEM
 
@@ -3968,6 +3981,12 @@ static int svm_check_intercept(struct kvm_vcpu *vcpu,
 	case SVM_EXIT_WRITE_DR0:
 		icpt_info.exit_code += info->modrm_reg;
 		break;
+	case SVM_EXIT_MSR:
+		if (info->intercept == x86_intercept_wrmsr)
+			vmcb->control.exit_info_1 = 1;
+		else
+			vmcb->control.exit_info_1 = 0;
+		break;
 	default:
 		break;
 	}