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,
Xiaoyao Li <xiaoyao.li@intel.com>
Subject: Re: [PATCH 01/10] KVM: nVMX: Move reflection check into nested_vmx_reflect_vmexit()
Date: Fri, 13 Mar 2020 13:12:33 +0100 [thread overview]
Message-ID: <87k13opi6m.fsf@vitty.brq.redhat.com> (raw)
In-Reply-To: <20200312184521.24579-2-sean.j.christopherson@intel.com>
Sean Christopherson <sean.j.christopherson@intel.com> writes:
> Move the call to nested_vmx_exit_reflected() from vmx_handle_exit() into
> nested_vmx_reflect_vmexit() and change the semantics of the return value
> for nested_vmx_reflect_vmexit() to indicate whether or not the exit was
> reflected into L1. nested_vmx_exit_reflected() and
> nested_vmx_reflect_vmexit() are intrinsically tied together, calling one
> without simultaneously calling the other makes little sense.
>
> No functional change intended.
>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> ---
> arch/x86/kvm/vmx/nested.h | 16 +++++++++++-----
> arch/x86/kvm/vmx/vmx.c | 4 ++--
> 2 files changed, 13 insertions(+), 7 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx/nested.h b/arch/x86/kvm/vmx/nested.h
> index 21d36652f213..6bc379cf4755 100644
> --- a/arch/x86/kvm/vmx/nested.h
> +++ b/arch/x86/kvm/vmx/nested.h
> @@ -72,12 +72,16 @@ static inline bool nested_ept_ad_enabled(struct kvm_vcpu *vcpu)
> }
>
> /*
> - * Reflect a VM Exit into L1.
> + * Conditionally reflect a VM-Exit into L1. Returns %true if the VM-Exit was
> + * reflected into L1.
> */
> -static inline int nested_vmx_reflect_vmexit(struct kvm_vcpu *vcpu,
> - u32 exit_reason)
> +static inline bool nested_vmx_reflect_vmexit(struct kvm_vcpu *vcpu,
> + u32 exit_reason)
> {
> - u32 exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
> + u32 exit_intr_info;
> +
> + if (!nested_vmx_exit_reflected(vcpu, exit_reason))
> + return false;
(unrelated to your patch)
It's probably just me but 'nested_vmx_exit_reflected()' name always
makes me thinkg 'the vmexit WAS [already] reflected' and not 'the vmexit
NEEDS to be reflected'. 'nested_vmx_exit_needs_reflecting()' maybe?
>
> /*
> * At this point, the exit interruption info in exit_intr_info
> @@ -85,6 +89,8 @@ static inline int nested_vmx_reflect_vmexit(struct kvm_vcpu *vcpu,
> * we need to query the in-kernel LAPIC.
> */
> WARN_ON(exit_reason == EXIT_REASON_EXTERNAL_INTERRUPT);
> +
> + exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
> if ((exit_intr_info &
> (INTR_INFO_VALID_MASK | INTR_INFO_DELIVER_CODE_MASK)) ==
> (INTR_INFO_VALID_MASK | INTR_INFO_DELIVER_CODE_MASK)) {
> @@ -96,7 +102,7 @@ static inline int nested_vmx_reflect_vmexit(struct kvm_vcpu *vcpu,
>
> nested_vmx_vmexit(vcpu, exit_reason, exit_intr_info,
> vmcs_readl(EXIT_QUALIFICATION));
> - return 1;
> + return true;
> }
>
> /*
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index 57742ddfd854..c1caac7e8f57 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -5863,8 +5863,8 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu,
> if (vmx->emulation_required)
> return handle_invalid_guest_state(vcpu);
>
> - if (is_guest_mode(vcpu) && nested_vmx_exit_reflected(vcpu, exit_reason))
> - return nested_vmx_reflect_vmexit(vcpu, exit_reason);
> + if (is_guest_mode(vcpu) && nested_vmx_reflect_vmexit(vcpu, exit_reason))
> + return 1;
>
> if (exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY) {
> dump_vmcs();
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
--
Vitaly
next prev parent reply other threads:[~2020-03-13 12:12 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-12 18:45 [PATCH 00/10] KVM: VMX: Unionize vcpu_vmx.exit_reason Sean Christopherson
2020-03-12 18:45 ` [PATCH 01/10] KVM: nVMX: Move reflection check into nested_vmx_reflect_vmexit() Sean Christopherson
2020-03-13 12:12 ` Vitaly Kuznetsov [this message]
2020-03-17 5:33 ` Sean Christopherson
2020-03-17 16:16 ` Sean Christopherson
2020-03-17 17:00 ` Vitaly Kuznetsov
2020-03-17 17:38 ` Paolo Bonzini
2020-03-17 18:01 ` Sean Christopherson
2020-03-12 18:45 ` [PATCH 02/10] KVM: nVMX: Drop a superfluous WARN on reflecting EXTERNAL_INTERRUPT Sean Christopherson
2020-03-13 12:14 ` Vitaly Kuznetsov
2020-03-12 18:45 ` [PATCH 03/10] KVM: nVMX: Pull exit_reason from vcpu_vmx in nested_vmx_exit_reflected() Sean Christopherson
2020-03-13 12:38 ` Vitaly Kuznetsov
2020-03-12 18:45 ` [PATCH 04/10] KVM: VMX: Convert local exit_reason to u16 " Sean Christopherson
2020-03-13 12:47 ` Vitaly Kuznetsov
2020-03-12 18:45 ` [PATCH 05/10] KVM: VMX: Convert local exit_reason to u16 in vmx_handle_exit() Sean Christopherson
2020-03-13 13:48 ` Vitaly Kuznetsov
2020-03-12 18:45 ` [PATCH 06/10] KVM: nVMX: Convert local exit_reason to u16 in ...enter_non_root_mode() Sean Christopherson
2020-03-13 13:55 ` Vitaly Kuznetsov
2020-03-13 14:00 ` David Laight
2020-03-17 5:29 ` Sean Christopherson
2020-03-17 17:40 ` Paolo Bonzini
2020-03-12 18:45 ` [PATCH 07/10] KVM: nVMX: Cast exit_reason to u16 to check for nested EXTERNAL_INTERRUPT Sean Christopherson
2020-03-13 13:56 ` Vitaly Kuznetsov
2020-03-12 18:45 ` [PATCH 08/10] KVM: nVMX: Rename exit_reason to vm_exit_reason for nested VM-Exit Sean Christopherson
2020-03-13 14:01 ` Vitaly Kuznetsov
2020-03-13 16:17 ` Sean Christopherson
2020-03-12 18:45 ` [PATCH 09/10] KVM: VMX: Cache vmx->exit_reason in local u16 in vmx_handle_exit_irqoff() Sean Christopherson
2020-03-13 14:09 ` Vitaly Kuznetsov
2020-03-17 17:50 ` Paolo Bonzini
2020-03-12 18:45 ` [PATCH 10/10] KVM: VMX: Convert vcpu_vmx.exit_reason to a union Sean Christopherson
2020-03-13 14:18 ` Vitaly Kuznetsov
2020-03-17 5:28 ` Sean Christopherson
2020-03-17 17:51 ` Paolo Bonzini
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87k13opi6m.fsf@vitty.brq.redhat.com \
--to=vkuznets@redhat.com \
--cc=jmattson@google.com \
--cc=joro@8bytes.org \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=pbonzini@redhat.com \
--cc=sean.j.christopherson@intel.com \
--cc=wanpengli@tencent.com \
--cc=xiaoyao.li@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).