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Commit 8061252e authored by Joerg Roedel's avatar Joerg Roedel Committed by Avi Kivity
Browse files

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: default avatarJoerg Roedel <joerg.roedel@amd.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent d7eb8203

arch/x86/include/asm/kvm_emulate.h

+2 −0
Original line number Diff line number Diff line
@@ -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

};

arch/x86/kvm/emulate.c

+18 −7
Original line number Diff line number Diff line
@@ -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),

arch/x86/kvm/svm.c

+19 −0
Original line number Diff line number Diff line
@@ -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;

	}