From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 11/13] KVM: x86: Add helper to "handle" internal emulation error
Date: Wed, 26 Feb 2020 18:52:14 +0100 [thread overview]
Message-ID: <87o8tli6cx.fsf@vitty.brq.redhat.com> (raw)
In-Reply-To: <20200218232953.5724-12-sean.j.christopherson@intel.com>
Sean Christopherson <sean.j.christopherson@intel.com> writes:
> Add a helper to set the appropriate error codes in vcpu->run when
> emulation fails (future patches will add additional failure scenarios).
>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> ---
> arch/x86/kvm/x86.c | 32 ++++++++++++++------------------
> 1 file changed, 14 insertions(+), 18 deletions(-)
>
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index e1eaca65756b..7bffdc6f9e1b 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -6491,6 +6491,14 @@ void kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip)
> }
> EXPORT_SYMBOL_GPL(kvm_inject_realmode_interrupt);
>
> +static int internal_emulation_error(struct kvm_vcpu *vcpu)
> +{
> + vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
> + vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
> + vcpu->run->internal.ndata = 0;
> + return 0;
> +}
> +
> static int handle_emulation_failure(struct x86_emulate_ctxt *ctxt,
> int emulation_type)
> {
> @@ -6504,21 +6512,13 @@ static int handle_emulation_failure(struct x86_emulate_ctxt *ctxt,
> return 1;
> }
>
> - if (emulation_type & EMULTYPE_SKIP) {
> - vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
> - vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
> - vcpu->run->internal.ndata = 0;
> - return 0;
> - }
> + if (emulation_type & EMULTYPE_SKIP)
> + return internal_emulation_error(vcpu);
>
> kvm_queue_exception(vcpu, UD_VECTOR);
>
> - if (!is_guest_mode(vcpu) && kvm_x86_ops->get_cpl(vcpu) == 0) {
> - vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
> - vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
> - vcpu->run->internal.ndata = 0;
> - return 0;
> - }
> + if (!is_guest_mode(vcpu) && kvm_x86_ops->get_cpl(vcpu) == 0)
> + return internal_emulation_error(vcpu);
>
> return 1;
> }
> @@ -8986,12 +8986,8 @@ int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int idt_index,
>
> ret = emulator_task_switch(ctxt, tss_selector, idt_index, reason,
> has_error_code, error_code);
> - if (ret) {
> - vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
> - vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
> - vcpu->run->internal.ndata = 0;
> - return 0;
> - }
> + if (ret)
> + return internal_emulation_error(vcpu);
>
> kvm_rip_write(vcpu, ctxt->eip);
> kvm_set_rflags(vcpu, ctxt->eflags);
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
--
Vitaly
next prev parent reply other threads:[~2020-02-26 17:52 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-18 23:29 [PATCH v2 00/13] KVM: x86: Allow userspace to disable the emulator Sean Christopherson
2020-02-18 23:29 ` [PATCH v2 01/13] KVM: x86: Refactor I/O emulation helpers to provide vcpu-only variant Sean Christopherson
2020-02-26 15:16 ` Vitaly Kuznetsov
2020-02-18 23:29 ` [PATCH v2 02/13] KVM: x86: Explicitly pass an exception struct to check_intercept Sean Christopherson
2020-02-18 23:29 ` [PATCH v2 03/13] KVM: x86: Move emulation-only helpers to emulate.c Sean Christopherson
2020-02-26 15:23 ` Vitaly Kuznetsov
2020-02-18 23:29 ` [PATCH v2 04/13] KVM: x86: Refactor R/W page helper to take the emulation context Sean Christopherson
2020-02-26 15:24 ` Vitaly Kuznetsov
2020-02-18 23:29 ` [PATCH v2 05/13] KVM: x86: Refactor emulated exception injection to take the emul context Sean Christopherson
2020-02-26 15:25 ` Vitaly Kuznetsov
2020-02-18 23:29 ` [PATCH v2 06/13] KVM: x86: Refactor emulate tracepoint to explicitly take context Sean Christopherson
2020-02-26 17:11 ` Vitaly Kuznetsov
2020-03-03 16:48 ` Sean Christopherson
2020-03-03 17:29 ` Paolo Bonzini
2020-03-03 17:42 ` Sean Christopherson
2020-03-03 17:44 ` Paolo Bonzini
2020-02-18 23:29 ` [PATCH v2 07/13] KVM: x86: Refactor init_emulate_ctxt() " Sean Christopherson
2020-02-26 17:13 ` Vitaly Kuznetsov
2020-02-18 23:29 ` [PATCH v2 08/13] KVM: x86: Dynamically allocate per-vCPU emulation context Sean Christopherson
2020-02-26 17:29 ` Vitaly Kuznetsov
2020-03-03 10:26 ` Paolo Bonzini
2020-03-03 14:57 ` Sean Christopherson
2020-03-03 16:18 ` Vitaly Kuznetsov
2020-03-03 16:52 ` Sean Christopherson
2020-02-18 23:29 ` [PATCH v2 09/13] KVM: x86: Move kvm_emulate.h into KVM's private directory Sean Christopherson
2020-02-26 17:38 ` Vitaly Kuznetsov
2020-03-03 10:27 ` Paolo Bonzini
2020-02-18 23:29 ` [PATCH v2 10/13] KVM: x86: Shrink the usercopy region of the emulation context Sean Christopherson
2020-02-26 17:51 ` Vitaly Kuznetsov
2020-03-02 18:40 ` Paolo Bonzini
2020-03-02 19:19 ` Sean Christopherson
2020-03-02 19:13 ` Sean Christopherson
2020-02-18 23:29 ` [PATCH v2 11/13] KVM: x86: Add helper to "handle" internal emulation error Sean Christopherson
2020-02-26 17:52 ` Vitaly Kuznetsov [this message]
2020-02-18 23:29 ` [PATCH v2 12/13] KVM: x86: Add variable to control existence of emulator Sean Christopherson
2020-02-26 18:01 ` Vitaly Kuznetsov
2020-02-18 23:29 ` [PATCH v2 13/13] KVM: x86: Allow userspace to disable the kernel's emulator Sean Christopherson
2020-03-02 18:42 ` [PATCH v2 00/13] KVM: x86: Allow userspace to disable the emulator Paolo Bonzini
2020-03-02 20:02 ` Sean Christopherson
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