Message ID | 20230302123029.153265-13-pbonzini@redhat.com |
---|---|
State | New |
Headers | show
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Thu, 02 Mar 2023 04:31:10 -0800 (PST) X-Google-Smtp-Source: AK7set++oaMcEDCaeHmK6MLEhwnmvYtirJGv5VtHS/X9NW79EMMehcEhYgy9ZK7DxCbNOSpDpPxR/w== X-Received: by 2002:a05:600c:5389:b0:3e2:dba:7155 with SMTP id hg9-20020a05600c538900b003e20dba7155mr7497607wmb.20.1677760270029; Thu, 02 Mar 2023 04:31:10 -0800 (PST) Received: from avogadro.local ([2001:b07:6468:f312:1c09:f536:3de6:228c]) by smtp.gmail.com with ESMTPSA id q11-20020a05600c46cb00b003dc1d668866sm3139050wmo.10.2023.03.02.04.31.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Mar 2023 04:31:09 -0800 (PST) From: Paolo Bonzini <pbonzini@redhat.com> To: qemu-devel@nongnu.org Cc: David Woodhouse <dwmw@amazon.co.uk>, Paul Durrant <paul@xen.org> Subject: [PULL 12/62] i386/xen: Implement SCHEDOP_poll and SCHEDOP_yield Date: Thu, 2 Mar 2023 13:29:39 +0100 Message-Id: <20230302123029.153265-13-pbonzini@redhat.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230302123029.153265-1-pbonzini@redhat.com> References: <20230302123029.153265-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; 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[PULL,01/62] include: import Xen public headers to hw/xen/interface
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diff --git a/target/i386/kvm/xen-emu.c b/target/i386/kvm/xen-emu.c index 4ed833656f72..ebea27caf634 100644 --- a/target/i386/kvm/xen-emu.c +++ b/target/i386/kvm/xen-emu.c @@ -234,6 +234,19 @@ static bool kvm_xen_hcall_sched_op(struct kvm_xen_exit *exit, X86CPU *cpu, err = schedop_shutdown(cs, arg); break; + case SCHEDOP_poll: + /* + * Linux will panic if this doesn't work. Just yield; it's not + * worth overthinking it because with event channel handling + * in KVM, the kernel will intercept this and it will never + * reach QEMU anyway. The semantics of the hypercall explicltly + * permit spurious wakeups. + */ + case SCHEDOP_yield: + sched_yield(); + err = 0; + break; + default: return false; }