From nobody Mon Sep 29 20:16:00 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D1851C00140 for ; Tue, 16 Aug 2022 00:34:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345921AbiHPAel (ORCPT ); Mon, 15 Aug 2022 20:34:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40744 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1354169AbiHPAbd (ORCPT ); Mon, 15 Aug 2022 20:31:33 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 583B21863C2; Mon, 15 Aug 2022 13:36:18 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id B53A2B8119A; Mon, 15 Aug 2022 20:36:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 03DDAC433D6; Mon, 15 Aug 2022 20:36:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1660595775; bh=S7d4yGC4YTeNiuyO44KxFCfnQFLrUfkWQP1/fk0L3Wo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tnMRMwyEeWVxEAvU8gCyIapXc4M5RJ+niv3dhaRfFHecdrTVZG/8mbecn9c8Rw5C+ Cawnbckk2A4ifhrL8O2Ye7b7aZjAwk/CHd0AyMMiLnAy5l7jffOz+ir7Lru2bON49e +k+3wZVyvaJeoRqlZwsNd/s4pmpQ6P5yPWtLbnRM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andrei Vagin , Paolo Bonzini , Sasha Levin Subject: [PATCH 5.19 0872/1157] selftests: kvm: set rax before vmcall Date: Mon, 15 Aug 2022 20:03:48 +0200 Message-Id: <20220815180514.342264801@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220815180439.416659447@linuxfoundation.org> References: <20220815180439.416659447@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Andrei Vagin [ Upstream commit 281106f938d3daaea6f8b6723a8217a2a1ef6936 ] kvm_hypercall has to place the hypercall number in rax. Trace events show that kvm_pv_test doesn't work properly: kvm_pv_test-53132: kvm_hypercall: nr 0x0 a0 0x0 a1 0x0 a2 0x0 a3 0x0 kvm_pv_test-53132: kvm_hypercall: nr 0x0 a0 0x0 a1 0x0 a2 0x0 a3 0x0 kvm_pv_test-53132: kvm_hypercall: nr 0x0 a0 0x0 a1 0x0 a2 0x0 a3 0x0 With this change, it starts working as expected: kvm_pv_test-54285: kvm_hypercall: nr 0x5 a0 0x0 a1 0x0 a2 0x0 a3 0x0 kvm_pv_test-54285: kvm_hypercall: nr 0xa a0 0x0 a1 0x0 a2 0x0 a3 0x0 kvm_pv_test-54285: kvm_hypercall: nr 0xb a0 0x0 a1 0x0 a2 0x0 a3 0x0 Signed-off-by: Andrei Vagin Message-Id: <20220722230241.1944655-5-avagin@google.com> Fixes: ac4a4d6de22e ("selftests: kvm: test enforcement of paravirtual cpuid= features") Signed-off-by: Paolo Bonzini Signed-off-by: Sasha Levin --- tools/testing/selftests/kvm/lib/x86_64/processor.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/tes= ting/selftests/kvm/lib/x86_64/processor.c index ead7011ee8f6..5d85e1c021da 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/processor.c +++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c @@ -1422,7 +1422,7 @@ uint64_t kvm_hypercall(uint64_t nr, uint64_t a0, uint= 64_t a1, uint64_t a2, =20 asm volatile("vmcall" : "=3Da"(r) - : "b"(a0), "c"(a1), "d"(a2), "S"(a3)); + : "a"(nr), "b"(a0), "c"(a1), "d"(a2), "S"(a3)); return r; } =20 --=20 2.35.1