From: Thomas Gleixner <tglx@linutronix.de>
To: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
x86@kernel.org, linux-arch@vger.kernel.org,
Will Deacon <will@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
Mark Rutland <mark.rutland@arm.com>,
Kees Cook <keescook@chromium.org>,
Keno Fischer <keno@juliacomputing.com>,
Paolo Bonzini <pbonzini@redhat.com>,
kvm@vger.kernel.org,
Gabriel Krisman Bertazi <krisman@collabora.com>
Subject: Re: [patch V4 15/15] x86/kvm: Use generic exit to guest work function
Date: Wed, 22 Jul 2020 09:40:13 +0200 [thread overview]
Message-ID: <87lfjc2e1u.fsf@nanos.tec.linutronix.de> (raw)
In-Reply-To: <20200721202745.GJ22083@linux.intel.com>
Sean Christopherson <sean.j.christopherson@intel.com> writes:
> On Tue, Jul 21, 2020 at 12:57:21PM +0200, Thomas Gleixner wrote:
>> - if (signal_pending(current))
>> + if (__exit_to_guest_mode_work_pending())
>
> I whined about this back in v2[*]. "exit to guest mode" is confusing becuase
> virt terminology is "enter to guest" and "exit from guest", whereas the
> kernel's terminology here is "exit from kernel to guest".
>
> My past and current self still like XFER_TO_GUEST as the base terminology.
>
> [*] https://lkml.kernel.org/r/20191023144848.GH329@linux.intel.com
Forgot about that, sorry. Will fix.
>> @@ -8676,15 +8677,11 @@ static int vcpu_run(struct kvm_vcpu *vcp
>> break;
>> }
>>
>> - if (signal_pending(current)) {
>> - r = -EINTR;
>> - vcpu->run->exit_reason = KVM_EXIT_INTR;
>> - ++vcpu->stat.signal_exits;
>> - break;
>> - }
>> - if (need_resched()) {
>> + if (exit_to_guest_mode_work_pending()) {
>> srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
>> - cond_resched();
>> + r = exit_to_guest_mode(vcpu);
>> + if (r)
>
> This loses the stat.signal_exits accounting. Maybe this?
No, it does not:
+ if (ti_work & _TIF_SIGPENDING) {
+ kvm_handle_signal_exit(vcpu);
+ return -EINTR;
+ }
and
+#ifdef CONFIG_KVM_EXIT_TO_GUEST_WORK
+static inline void kvm_handle_signal_exit(struct kvm_vcpu *vcpu)
+{
+ vcpu->run->exit_reason = KVM_EXIT_INTR;
+ vcpu->stat.signal_exits++;
+}
+#endif /* CONFIG_KVM_EXIT_TO_GUEST_WORK */
in patch 5/15
Thanks,
tglx
prev parent reply other threads:[~2020-07-22 7:40 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-21 10:57 [patch V4 00/15] entry, x86, kvm: Generic entry/exit functionality for host and guest Thomas Gleixner
2020-07-21 10:57 ` [patch V4 01/15] seccomp: Provide stub for __secure_computing() Thomas Gleixner
2020-07-21 21:21 ` Kees Cook
2020-07-21 10:57 ` [patch V4 02/15] entry: Provide generic syscall entry functionality Thomas Gleixner
2020-07-21 21:38 ` Kees Cook
2020-07-22 7:34 ` Thomas Gleixner
2020-07-22 7:54 ` peterz
2020-07-21 10:57 ` [patch V4 03/15] entry: Provide generic syscall exit function Thomas Gleixner
2020-07-27 22:37 ` Andy Lutomirski
2020-07-21 10:57 ` [patch V4 04/15] entry: Provide generic interrupt entry/exit code Thomas Gleixner
2020-07-27 22:39 ` Andy Lutomirski
2020-07-29 12:18 ` Thomas Gleixner
2020-07-21 10:57 ` [patch V4 05/15] entry: Provide infrastructure for work before exiting to guest mode Thomas Gleixner
2020-07-21 10:57 ` [patch V4 06/15] x86/entry: Consolidate check_user_regs() Thomas Gleixner
2020-07-27 22:39 ` Andy Lutomirski
2020-07-21 10:57 ` [patch V4 07/15] x86/entry: Consolidate 32/64 bit syscall entry Thomas Gleixner
2020-07-21 10:57 ` [patch V4 08/15] x86/entry: Move user return notifier out of loop Thomas Gleixner
2020-07-21 10:57 ` [patch V4 09/15] x86/ptrace: Provide pt_regs helper for entry/exit Thomas Gleixner
2020-07-21 10:57 ` [patch V4 10/15] x86/entry: Use generic syscall entry function Thomas Gleixner
2020-07-21 21:47 ` Kees Cook
2020-07-22 18:25 ` Thomas Gleixner
2020-07-21 10:57 ` [patch V4 11/15] x86/entry: Use generic syscall exit functionality Thomas Gleixner
2020-07-21 21:47 ` Kees Cook
2020-07-21 10:57 ` [patch V4 12/15] x86/entry: Cleanup idtentry_entry/exit_user Thomas Gleixner
2020-07-21 21:48 ` Kees Cook
2020-07-21 10:57 ` [patch V4 13/15] x86/entry: Use generic interrupt entry/exit code Thomas Gleixner
2020-07-21 10:57 ` [patch V4 14/15] x86/entry: Cleanup idtentry_enter/exit Thomas Gleixner
2020-07-21 21:48 ` Kees Cook
2020-07-21 10:57 ` [patch V4 15/15] x86/kvm: Use generic exit to guest work function Thomas Gleixner
2020-07-21 20:27 ` Sean Christopherson
2020-07-22 7:40 ` Thomas Gleixner [this message]
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