linux-kernel - Re: [PATCH] KVM: x86: remove duplicated KVM_REQ

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Message-ID: <1386ffda-37c7-aef6-2ff4-f2b753b51af1@redhat.com>
Date:   Wed, 12 Feb 2020 12:49:33 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        linmiaohe <linmiaohe@...wei.com>
Cc:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "rkrcmar@...hat.com" <rkrcmar@...hat.com>,
        "sean.j.christopherson@...el.com" <sean.j.christopherson@...el.com>,
        "wanpengli@...cent.com" <wanpengli@...cent.com>,
        "jmattson@...gle.com" <jmattson@...gle.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>, "hpa@...or.com" <hpa@...or.com>
Subject: Re: [PATCH] KVM: x86: remove duplicated KVM_REQ_EVENT request

On 07/02/20 10:05, Vitaly Kuznetsov wrote:
> kvm_make_request() from kvm_set_rflags() as it is not an obvious
> behavior (e.g. why kvm_rip_write() doens't do that and
> kvm_set_rflags() does ?)

Because writing RFLAGS can change IF and therefore cause an interrupt to
be injected.

Paolo