From: Paolo Bonzini <pbonzini@redhat.com>
To: Joerg Roedel <jroedel@suse.de>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, agraf@suse.de,
valentine.sinitsyn@gmail.com, jan.kiszka@siemens.com,
gleb@cloudius-systems.com, avi@cloudius-systems.com
Subject: Re: [PATCH 2/4] KVM: nSVM: propagate the NPF EXITINFO to the guest
Date: Tue, 02 Sep 2014 19:01:21 +0200 [thread overview]
Message-ID: <5405F7E1.1090505@redhat.com> (raw)
In-Reply-To: <5405F44E.7090803@redhat.com>
Il 02/09/2014 18:46, Paolo Bonzini ha scritto:
>> > How about an io-port emulated on
>> > L1 but passed through to L2 by the nested hypervisor. On emulation of
>> > INS or OUTS, KVM would need to read/write to an L2 address space,
> It would need to read/write to *L1* (that's where the VMCB's IOIO map
> lies), which could result into a regular page fault injected into L1.
Nevermind, the VMCB's IO bitmap is a guest physical address. I see what
you mean now. nested_svm_intercept_ioio would return NESTED_EXIT_HOST
and proceed to emulate the read/write. This could indeed cause a NPF.
For now I'll remove the WARN_ON.
Paolo
next prev parent reply other threads:[~2014-09-02 17:01 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-02 15:13 [PATCH 0/4] KVM: nested x86: nested page faults fixes Paolo Bonzini
2014-09-02 15:13 ` [PATCH 1/4] KVM: x86: reserve bit 8 of non-leaf PDPEs and PML4Es in 64-bit mode on AMD Paolo Bonzini
2014-09-02 15:13 ` [PATCH 2/4] KVM: nSVM: propagate the NPF EXITINFO to the guest Paolo Bonzini
2014-09-02 16:33 ` Joerg Roedel
2014-09-02 16:46 ` Paolo Bonzini
2014-09-02 17:01 ` Paolo Bonzini [this message]
2014-09-02 17:01 ` Joerg Roedel
2014-09-02 17:47 ` Avi Kivity
2014-09-02 15:13 ` [PATCH 3/4] KVM: x86: inject nested page faults on emulated instructions Paolo Bonzini
2014-09-04 7:02 ` Gleb Natapov
2014-09-04 14:12 ` Paolo Bonzini
2014-09-04 15:05 ` Gleb Natapov
2014-09-04 17:17 ` Paolo Bonzini
2014-09-04 17:44 ` Paolo Bonzini
2014-09-05 9:47 ` Gleb Natapov
2014-09-02 15:13 ` [PATCH 4/4] KVM: x86: propagate exception from permission checks on the nested page fault Paolo Bonzini
2014-09-02 16:02 ` [PATCH 0/4] KVM: nested x86: nested page faults fixes Valentine Sinitsyn
2014-09-02 16:56 ` Paolo Bonzini
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