From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joao Martins Subject: [PATCH RFC 14/39] KVM: x86/xen: handle PV IPI vcpu yield Date: Wed, 20 Feb 2019 20:15:44 +0000 Message-ID: <20190220201609.28290-15-joao.m.martins@oracle.com> References: <20190220201609.28290-1-joao.m.martins@oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Cc: Ankur Arora , Boris Ostrovsky , Joao Martins , Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , x86@kernel.org To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Return-path: In-Reply-To: <20190220201609.28290-1-joao.m.martins@oracle.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org Cooperative Linux guests after an IPI-many may yield vcpu if any of the IPI'd vcpus were preempted (i.e. runstate is 'runnable'.) Support SCHEDOP_yield for handling yield. Signed-off-by: Joao Martins --- arch/x86/kvm/xen.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c index ec40cb1de6b6..753a6d2c11cd 100644 --- a/arch/x86/kvm/xen.c +++ b/arch/x86/kvm/xen.c @@ -17,6 +17,7 @@ #include #include #include +#include #include "trace.h" @@ -668,6 +669,31 @@ static int kvm_xen_hcall_set_timer_op(struct kvm_vcpu *vcpu, uint64_t timeout) return 0; } +static int kvm_xen_hcall_sched_op(struct kvm_vcpu *vcpu, int cmd, u64 param) +{ + int ret = -ENOSYS; + gpa_t gpa; + int idx; + + idx = srcu_read_lock(&vcpu->kvm->srcu); + gpa = kvm_mmu_gva_to_gpa_system(vcpu, param, NULL); + srcu_read_unlock(&vcpu->kvm->srcu, idx); + + if (!gpa) + return -EFAULT; + + switch (cmd) { + case SCHEDOP_yield: + kvm_vcpu_on_spin(vcpu, true); + ret = 0; + break; + default: + break; + } + + return ret; +} + int kvm_xen_hypercall(struct kvm_vcpu *vcpu) { bool longmode; @@ -714,6 +740,11 @@ int kvm_xen_hypercall(struct kvm_vcpu *vcpu) if (!r) goto hcall_success; break; + case __HYPERVISOR_sched_op: + r = kvm_xen_hcall_sched_op(vcpu, params[0], params[1]); + if (!r) + goto hcall_success; + break; /* fallthrough */ default: break; -- 2.11.0