similar to: [PATCH 3/4] x86/emulator: properly handle lzcnt and tzcnt

Utilize some of the additions in the prior patches to clean up other code: - keep track of REP prefixes in only one variable - use REX_W in a few more places (instead of a literal number) Signed-off-by: Jan Beulich <jbeulich@suse.com> --- a/xen/arch/x86/x86_emulate/x86_emulate.c +++ b/xen/arch/x86/x86_emulate/x86_emulate.c @@ -304,6 +304,10 @@ union vex { ptr[1] = rex |

With the x86 instruction emulator no pretty complete, I''d like to re-submit this patch to support cmpxchg16b on x86-64 and at once rename the underlying emulator callback function pointer (making clear that if implemented, it is to operate on two longs rather than two 32-bit values). At the same time it fixes an apparently wrong emulator context initialization in the shadow code.

Commit 86781624 ("x86_emulate: PUSH <mem> must read source operand just once") corrected the operands of those of the operations of opcode extension group 5 that only read memory from SrcMem to DstMem, but failed to also switch the use of "dst" here to "src". Reported-by: Anthony Perard <anthony.perard@citrix.com> Signed-off-by: Jan Beulich

Hi guys, At a loss trying to figure why if (has_eflag(X86_EFLAGS_ID)) returns false in my HVM domU. Standard function has_eflag() in cpucheck.c running in real mode. Works fine on PV dom0, but fails when guest is booting on my hybrid dom0. LMK if any ideas. I''ll keep digging in the manuals, but nothing so far. thanks, Mukesh

From: Mihai Don?u <mdontu at bitdefender.com> This is needed in order to be able to support guest code that uses movsd to write into pages that are marked for write tracking. Signed-off-by: Mihai Don?u <mdontu at bitdefender.com> Signed-off-by: Adalbert Laz?r <alazar at bitdefender.com> --- arch/x86/kvm/emulate.c | 32 +++++++++++++++++++++++++++----- 1 file changed, 27

Hello all, I am trying to port some more code from windows 2000 to linux. The specific functionality I would like to port is called "Structured Exception Handling" and it works like so: 1. Define a function which based upons a signal throws an exceptoion. For example: void translateException(unsigned int u, EXCEPTION_POINTERS* pExp) { switch (u) { case (unsigned

Hi all, In arch/x86/x86_emulate.c: x86_emulate(): 1716 case 0xfe: /* Grp4 */ 1717 generate_exception_if((m odrm_reg & 7) >= 2, EXC_UD); 1718 case 0xff: /* Grp5 */ 1719 switch ( modrm_reg & 7 ) 1720 { 1721 case 0: /* inc */ 1722 emulate_1op("inc", dst, _regs.eflags); 1723 break; 1724

Hi all, Some non trivial legalization of operations which aren't supported by the backend would benefit from having the optimizer pass on them. I noticed some example trying to optimize various pieces of code over the past weeks. One offender is the cttz/ctlz intrinsic when defined on 0. On X86, BSR and NSF are undefined on 0, and only recent CPU have the LZCNT and TZCNT instructions that

I may be wrong here, but legalizing early seems like something that is more likely to prevent optimizations than it is to encourage them. But I guess I don't follow why things like TTI, TII and TLI queries don't suffice for this. CodeGenPrepare will break this sequence up. I would imagine that if the target returns false for isCheapToSpeculateCtlz() and false for canInsertSelect(), the

Otherwise, pause or the recommended one-byte ret workaround on AMD processors may have ill side effects. Signed-off-by: Jan Beulich <jbeulich@novell.com> Index: 2007-02-07/xen/arch/x86/x86_emulate.c =================================================================== --- 2007-02-07.orig/xen/arch/x86/x86_emulate.c 2007-02-08 08:46:39.000000000 +0100 +++ 2007-02-07/xen/arch/x86/x86_emulate.c

LLVM Weekly - #213, Jan 29th 2018 ================================= If you prefer, you can read a HTML version of this email at <http://llvmweekly.org/issue/213>. Welcome to the two hundred and thirteenth issue of LLVM Weekly, a weekly newsletter (published every Monday) covering developments in LLVM, Clang, and related projects. LLVM Weekly is brought to you by [Alex

We saw these issues in recent ChangeSet: 1. Reboot fail in Guest OS: Reboot in guest will close current qemu windows but does not create a new qemu window to restart 32bit HV/xen0: 2. 4 LTP math cases(float_bessel, float_exp_log, float_power and float_trigo) sometime fail. (775) 3. Kernel build in VMX may meet kernel panic. It complains like: "<0> Kernel panic - not syncing:

This patch series is a reworking of a series developed by Mukesh Rathor at Oracle. The entirety of the design and development was done by him; I have only reworked, reorganized, and simplified things in a way that I think makes more sense. The vast majority of the credit for this effort therefore goes to him. This version is labelled v13 because it is based on his most recent series, v11.