From: Paolo Bonzini <pbonzini@redhat.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: wanpengli@tencent.com, linxl3@wangsu.com,
Haiwei Li <lihaiwei@tencent.com>
Subject: [PATCH 2/7] KVM: X86: Introduce kvm_vcpu_exit_request() helper
Date: Wed, 6 May 2020 12:10:43 -0400 [thread overview]
Message-ID: <20200506161048.28840-3-pbonzini@redhat.com> (raw)
In-Reply-To: <20200506161048.28840-1-pbonzini@redhat.com>
From: Wanpeng Li <wanpengli@tencent.com>
Introduce kvm_vcpu_exit_request() helper, we need to check some conditions
before enter guest again immediately, we skip invoking the exit handler and
go through full run loop if complete fastpath but there is stuff preventing
we enter guest again immediately.
Tested-by: Haiwei Li <lihaiwei@tencent.com>
Cc: Haiwei Li <lihaiwei@tencent.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Message-Id: <1588055009-12677-5-git-send-email-wanpengli@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/kvm/x86.c | 10 ++++++++--
arch/x86/kvm/x86.h | 1 +
2 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index e7017c656311..999275795bba 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1581,6 +1581,13 @@ int kvm_emulate_wrmsr(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_emulate_wrmsr);
+bool kvm_vcpu_exit_request(struct kvm_vcpu *vcpu)
+{
+ return vcpu->mode == EXITING_GUEST_MODE || kvm_request_pending(vcpu) ||
+ need_resched() || signal_pending(current);
+}
+EXPORT_SYMBOL_GPL(kvm_vcpu_exit_request);
+
/*
* The fast path for frequent and performance sensitive wrmsr emulation,
* i.e. the sending of IPI, sending IPI early in the VM-Exit flow reduces
@@ -8365,8 +8372,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
if (kvm_lapic_enabled(vcpu) && vcpu->arch.apicv_active)
kvm_x86_ops.sync_pir_to_irr(vcpu);
- if (vcpu->mode == EXITING_GUEST_MODE || kvm_request_pending(vcpu)
- || need_resched() || signal_pending(current)) {
+ if (kvm_vcpu_exit_request(vcpu)) {
vcpu->mode = OUTSIDE_GUEST_MODE;
smp_wmb();
local_irq_enable();
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index 7b5ed8ed628e..e02fe28254b6 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -364,5 +364,6 @@ static inline bool kvm_dr7_valid(u64 data)
void kvm_load_guest_xsave_state(struct kvm_vcpu *vcpu);
void kvm_load_host_xsave_state(struct kvm_vcpu *vcpu);
u64 kvm_spec_ctrl_valid_bits(struct kvm_vcpu *vcpu);
+bool kvm_vcpu_exit_request(struct kvm_vcpu *vcpu);
#endif
--
2.18.2
next prev parent reply other threads:[~2020-05-06 16:11 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-06 16:10 [PATCH v5 0/7] KVM: VMX: Tscdeadline timer emulation fastpath Paolo Bonzini
2020-05-06 16:10 ` [PATCH 1/7] KVM: VMX: Introduce generic fastpath handler Paolo Bonzini
2020-05-06 16:10 ` Paolo Bonzini [this message]
2020-05-06 16:10 ` [PATCH 3/7] KVM: X86: Introduce more exit_fastpath_completion enum values Paolo Bonzini
2020-05-06 16:10 ` [PATCH 4/7] KVM: VMX: Optimize posted-interrupt delivery for timer fastpath Paolo Bonzini
2020-05-06 16:10 ` [PATCH 5/7] KVM: x86: introduce kvm_can_use_hv_timer Paolo Bonzini
2020-05-06 16:10 ` [PATCH 6/7] KVM: X86: TSCDEADLINE MSR emulation fastpath Paolo Bonzini
2020-05-06 16:10 ` [PATCH 7/7] KVM: VMX: Handle preemption timer fastpath 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=20200506161048.28840-3-pbonzini@redhat.com \
--to=pbonzini@redhat.com \
--cc=kvm@vger.kernel.org \
--cc=lihaiwei@tencent.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linxl3@wangsu.com \
--cc=wanpengli@tencent.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).