KVM: x86 emulator: implement RDTSC (opcode 0F 31) (48bb5d3c) · Commits · e / devices / android_kernel_fairphone_FP5

arch/x86/kvm/emulate.c

+18 −1

Original line number	Diff line number	Diff line
		@@ -2279,6 +2279,22 @@ static int em_imul_3op(struct x86_emulate_ctxt *ctxt)
		return em_imul(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)) {
		emulate_gp(ctxt, 0);
		return X86EMUL_PROPAGATE_FAULT;
		}
		ctxt->ops->get_msr(ctxt->vcpu, MSR_IA32_TSC, &tsc);
		c->regs[VCPU_REGS_RAX] = (u32)tsc;
		c->regs[VCPU_REGS_RDX] = tsc >> 32;
		return X86EMUL_CONTINUE;
		}

		#define D(_y) { .flags = (_y) }
		#define N D(0)
		#define G(_f, _g) { .flags = ((_f) \| Group), .u.group = (_g) }
		@@ -2469,7 +2485,8 @@ static struct opcode twobyte_table[256] = {
		N, N, N, N,
		N, N, N, N, N, N, N, N,
		/* 0x30 - 0x3F */
		D(ImplicitOps \| Priv), N, D(ImplicitOps \| Priv), N,
		D(ImplicitOps \| Priv), I(ImplicitOps, em_rdtsc),
		D(ImplicitOps \| Priv), N,
		D(ImplicitOps), D(ImplicitOps \| Priv), N, N,
		N, N, N, N, N, N, N, N,
		/* 0x40 - 0x4F */