From nobody Thu Nov 28 06:29:52 2024 Received: from smtp-fw-80007.amazon.com (smtp-fw-80007.amazon.com [99.78.197.218]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1BE70215F5A; Fri, 4 Oct 2024 14:09:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=99.78.197.218 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728050951; cv=none; b=hL2RMvV41osUibkKOet3JGG9jq6piijqsYm8KeGlp6Rd9kimHG8Irbrn3Uf4/kI6kYoZ3aEsoerCsm0jiyv3tclFRgrR8csQgrBnOEGIjlQ2/NbdXAQgGTYmzFWI2EyY5iCP0jy116l7CG+ec9xS65XoOvDRM0D8x6CIfvGEpfw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728050951; c=relaxed/simple; bh=d5e3re3bKYhsCTezzJ6vHBEGbT/gEBMfZwqxRw4jXj0=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=jbFJP1ZrBpJ39IZzK+KsvZ5476B3i7O2NUvSToIhjwcXBBGgE+YVfdkFsZFsXCL9WOwHvmJVJBvkx8Hxqq5N0s2OEEBhvMvuQdcrkRNAiXpR+4GlDNFmdiHad1/2C8KUUkEjKaGBPlHZ/s6ZvPnXvnpgm+qX8ZPcXCjyJcxaTRk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.de; spf=pass smtp.mailfrom=amazon.de; dkim=pass (1024-bit key) header.d=amazon.de header.i=@amazon.de header.b=ZaJBfKXk; arc=none smtp.client-ip=99.78.197.218 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=amazon.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amazon.de header.i=@amazon.de header.b="ZaJBfKXk" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.de; i=@amazon.de; q=dns/txt; s=amazon201209; t=1728050951; x=1759586951; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=H0Of6mnihpmPtExDP0xT26xF0R3YjWEN9KFRfWKloXQ=; b=ZaJBfKXkQsgJvyAx03v2yOqYJ4WNw/exbFyk3N4DcKEisgHakV9JK6JK kQjXQb7+X9FurUVsI7r408ZLlTfDI07WP/LWMofFMNpLQFZGmdb1QsaoR oYiyCXFPQ4pI4Xu6WxoHGfbdbYYioBK9gnOu+KsaYh1hPPmGIcTco9X/Q Y=; X-IronPort-AV: E=Sophos;i="6.11,177,1725321600"; d="scan'208";a="339710839" Received: from pdx4-co-svc-p1-lb2-vlan2.amazon.com (HELO smtpout.prod.us-west-2.prod.farcaster.email.amazon.dev) ([10.25.36.210]) by smtp-border-fw-80007.pdx80.corp.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Oct 2024 14:09:10 +0000 Received: from EX19MTAEUA002.ant.amazon.com [10.0.17.79:48210] by smtpin.naws.eu-west-1.prod.farcaster.email.amazon.dev [10.0.16.194:2525] with esmtp (Farcaster) id 4e6ccfcf-09ca-4d48-a91d-b8dd0cd98837; Fri, 4 Oct 2024 14:09:08 +0000 (UTC) X-Farcaster-Flow-ID: 4e6ccfcf-09ca-4d48-a91d-b8dd0cd98837 Received: from EX19D004EUA001.ant.amazon.com (10.252.50.27) by EX19MTAEUA002.ant.amazon.com (10.252.50.124) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1258.34; Fri, 4 Oct 2024 14:09:07 +0000 Received: from EX19MTAUEA001.ant.amazon.com (10.252.134.203) by EX19D004EUA001.ant.amazon.com (10.252.50.27) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1258.34; Fri, 4 Oct 2024 14:09:07 +0000 Received: from email-imr-corp-prod-iad-all-1b-85daddd1.us-east-1.amazon.com (10.43.8.2) by mail-relay.amazon.com (10.252.134.102) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1258.34 via Frontend Transport; Fri, 4 Oct 2024 14:09:07 +0000 Received: from dev-dsk-nikwip-1b-bc9ec026.eu-west-1.amazon.com (dev-dsk-nikwip-1b-bc9ec026.eu-west-1.amazon.com [10.253.74.52]) by email-imr-corp-prod-iad-all-1b-85daddd1.us-east-1.amazon.com (Postfix) with ESMTPS id C101D40600; Fri, 4 Oct 2024 14:09:05 +0000 (UTC) From: Nikolas Wipper To: Vitaly Kuznetsov CC: Nicolas Saenz Julienne , Alexander Graf , James Gowans , , Sean Christopherson , "Paolo Bonzini" , Thomas Gleixner , "Ingo Molnar" , Borislav Petkov , Dave Hansen , Nikolas Wipper , , , , , , "Nikolas Wipper" Subject: [PATCH 3/7] KVM: x86: Check vCPUs before enqueuing TLB flushes in kvm_hv_flush_tlb() Date: Fri, 4 Oct 2024 14:08:06 +0000 Message-ID: <20241004140810.34231-4-nikwip@amazon.de> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20241004140810.34231-1-nikwip@amazon.de> References: <20241004140810.34231-1-nikwip@amazon.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In Hyper-V's kvm_hv_flush_tlb(), check targeted vCPUs and store them in a bitmap before flushing their TLBs. In a subsequent commit, remote TLB flushes may need to be aborted, so allow checking for that before starting to enque the flushes. No functional change intended. Signed-off-by: Nikolas Wipper --- arch/x86/kvm/hyperv.c | 30 +++++++++++++++--------------- 1 file changed, 15 insertions(+), 15 deletions(-) diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index 6e7941ed25ae..e68fbc0c7fc1 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -2134,26 +2134,21 @@ static u64 kvm_hv_flush_tlb(struct kvm_vcpu *vcpu, = struct kvm_hv_hcall *hc) * analyze it here, flush TLB regardless of the specified address space. */ if (all_cpus && !is_guest_mode(vcpu)) { + bitmap_zero(vcpu_mask, KVM_MAX_VCPUS); + kvm_for_each_vcpu(i, v, kvm) { - tlb_flush_fifo =3D kvm_hv_get_tlb_flush_fifo(v, false); - hv_tlb_flush_enqueue(v, tlb_flush_fifo, - tlb_flush_entries, hc->rep_cnt); + __set_bit(i, vcpu_mask); } - - kvm_make_all_cpus_request(kvm, KVM_REQ_HV_TLB_FLUSH); } else if (!is_guest_mode(vcpu)) { sparse_set_to_vcpu_mask(kvm, sparse_banks, valid_bank_mask, vcpu_mask); =20 for_each_set_bit(i, vcpu_mask, KVM_MAX_VCPUS) { v =3D kvm_get_vcpu(kvm, i); - if (!v) + if (!v) { + __clear_bit(i, vcpu_mask); continue; - tlb_flush_fifo =3D kvm_hv_get_tlb_flush_fifo(v, false); - hv_tlb_flush_enqueue(v, tlb_flush_fifo, - tlb_flush_entries, hc->rep_cnt); + } } - - kvm_make_vcpus_request_mask(kvm, KVM_REQ_HV_TLB_FLUSH, vcpu_mask); } else { struct kvm_vcpu_hv *hv_v; =20 @@ -2181,14 +2176,19 @@ static u64 kvm_hv_flush_tlb(struct kvm_vcpu *vcpu, = struct kvm_hv_hcall *hc) continue; =20 __set_bit(i, vcpu_mask); - tlb_flush_fifo =3D kvm_hv_get_tlb_flush_fifo(v, true); - hv_tlb_flush_enqueue(v, tlb_flush_fifo, - tlb_flush_entries, hc->rep_cnt); } + } =20 - kvm_make_vcpus_request_mask(kvm, KVM_REQ_HV_TLB_FLUSH, vcpu_mask); + for_each_set_bit(i, vcpu_mask, KVM_MAX_VCPUS) { + v =3D kvm_get_vcpu(kvm, i); + + tlb_flush_fifo =3D kvm_hv_get_tlb_flush_fifo(v, is_guest_mode(vcpu)); + hv_tlb_flush_enqueue(v, tlb_flush_fifo, + tlb_flush_entries, hc->rep_cnt); } =20 + kvm_make_vcpus_request_mask(kvm, KVM_REQ_HV_TLB_FLUSH, vcpu_mask); + ret_success: /* We always do full TLB flush, set 'Reps completed' =3D 'Rep Count' */ return (u64)HV_STATUS_SUCCESS | --=20 2.40.1 Amazon Web Services Development Center Germany GmbH Krausenstr. 38 10117 Berlin Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss Eingetragen am Amtsgericht Charlottenburg unter HRB 257764 B Sitz: Berlin Ust-ID: DE 365 538 597