Re: [PATCH 0/8] KVM: x86: Emulator fixes

[Paolo Bonzini <pbonzini@redhat.com>]

On 25/12/2014 01:52, Nadav Amit wrote:
> Few more emulator fixes. Each is logically independent from the others.
> 
> The first one is the most interesting one.  It appears that the current
> behavior may cause the VM to enter the page-fault handler twice on certain
> faulting write accesses. If you do not like my solution, please propose a
> better one.
> 
> The fourth (JMP/CALL using call- or task-gate) is not a fix, but returns an
> error instead of emulating the wrong (#GP) exception.
> 
> Thanks for reviewing the patches.
> 
> Nadav Amit (8):
>   KVM: x86: #PF error-code on R/W operations is wrong
>   KVM: x86: pop sreg accesses only 2 bytes
>   KVM: x86: fnstcw and fnstsw may cause spurious exception
>   KVM: x86: JMP/CALL using call- or task-gate causes exception
>   KVM: x86: em_call_far should return failure result
>   KVM: x86: POP [ESP] is not emulated correctly
>   KVM: x86: Do not set access bit on accessed segments
>   KVM: x86: Access to LDT/GDT that wraparound is incorrect
> 
>  arch/x86/include/asm/kvm_host.h |  12 ++++
>  arch/x86/kvm/emulate.c          | 138 ++++++++++++++++++++++++++--------------
>  arch/x86/kvm/mmu.h              |  12 ----
>  3 files changed, 103 insertions(+), 59 deletions(-)
> 

I'm applying patches 2-8.  I want to play a bit more with patch 1.

Paolo