From patchwork Mon Jun 10 13:38:32 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arthur Chunqi Li X-Patchwork-Id: 2697591 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id 9251DDF264 for ; Mon, 10 Jun 2013 13:39:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752858Ab3FJNjA (ORCPT ); Mon, 10 Jun 2013 09:39:00 -0400 Received: from mail-pb0-f42.google.com ([209.85.160.42]:58975 "EHLO mail-pb0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752430Ab3FJNi7 (ORCPT ); Mon, 10 Jun 2013 09:38:59 -0400 Received: by mail-pb0-f42.google.com with SMTP id un1so3123978pbc.1 for ; Mon, 10 Jun 2013 06:38:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:x-mailer; bh=Y09PNXRfdapcWK8WY8Zvu7p+l0zAxsD/hzULAyUt3tk=; b=vXb+jl26ux52ZlCO1Dv9ONG7fVHlA7Rj6VK4OW2ADnqfGxEqd6pLIoitvJk9u8z6X4 EA/MX2wCdkhu3Qf8Ut77bCf66Kz9WgkmCQhNIgqUAUJrWmiJuac6tAsK5xlii5R4kcGu YCii6jG+j3e9hVPRbPIIOVoHH87o6DX6UR+5jepgwrNFR1FuHV13bTcFeXzl8Yyq4ylz Ah0qHUq9bQQ653gY4a5soW3wV6NntYCqMUxv63UU9JsVZrPd5LSZrwnxTOHbmnyup4pI 4giU0YJws2zQO16fAFpVp43srtMHbpIp5nyXRJ9GO+NkJVbjJjZVo9679PTIPxFb3Yuh pBGQ== X-Received: by 10.66.145.2 with SMTP id sq2mr13948154pab.2.1370871538728; Mon, 10 Jun 2013 06:38:58 -0700 (PDT) Received: from Blade1-02.Blade1-02 ([162.105.146.101]) by mx.google.com with ESMTPSA id ra4sm15644107pab.9.2013.06.10.06.38.44 for (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 10 Jun 2013 06:38:46 -0700 (PDT) From: Arthur Chunqi Li To: kvm@vger.kernel.org Cc: gleb@redhat.com, pbonzini@redhat.com, Arthur Chunqi Li Subject: [PATCH 1/2] kvm-unit-tests: Add a func to run instruction in emulator Date: Mon, 10 Jun 2013 21:38:32 +0800 Message-Id: <1370871513-31815-1-git-send-email-yzt356@gmail.com> X-Mailer: git-send-email 1.7.9.5 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Add a function trap_emulator to run an instruction in emulator. Set inregs first (%rax is invalid because it is used as return address), put instruction codec in alt_insn and call func with alt_insn_length. Get results in outregs. Signed-off-by: Arthur Chunqi Li --- x86/emulator.c | 106 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 106 insertions(+) diff --git a/x86/emulator.c b/x86/emulator.c index 96576e5..a1bd92e 100644 --- a/x86/emulator.c +++ b/x86/emulator.c @@ -11,6 +11,13 @@ int fails, tests; static int exceptions; +struct regs { + u64 rax, rbx, rcx, rdx; + u64 rsi, rdi, rsp, rbp; + u64 rip, rflags; +}; +static struct regs inregs, outregs; + void report(const char *name, int result) { ++tests; @@ -685,6 +692,105 @@ static void test_shld_shrd(u32 *mem) report("shrd (cl)", *mem == ((0x12345678 >> 3) | (5u << 29))); } +static void trap_emulator(uint64_t *mem, uint8_t *insn_page, + uint8_t *alt_insn_page, void *insn_ram, + uint8_t* alt_insn, int alt_insn_length, int reserve_stack) +{ + ulong *cr3 = (ulong *)read_cr3(); + int i; + static struct regs save; + + // Pad with RET instructions + memset(insn_page, 0x90, 4096); + memset(alt_insn_page, 0x90, 4096); + + asm volatile( + "movw $1, %0\n\t" + : : "m"(mem) + : "memory" + ); + // Place a trapping instruction in the page to trigger a VMEXIT + insn_page[0] = 0xc3; // ret + if (!reserve_stack) + { + insn_page[1] = 0x49; // xchg %rsp,%r9 + insn_page[2] = 0x87; + insn_page[3] = 0xe1; + insn_page[4] = 0x49; // xchg %rbp,%r10 + insn_page[5] = 0x87; + insn_page[6] = 0xea; + } + //in (%dx),%al, may change in the future + insn_page[7] = 0xec; + + // Place the instruction we want the hypervisor to see in the alternate page + for (i=7; i