From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=95.215.58.50 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793782146; b=5Y/b6Cg/Xrbx/wV9l48cFZ661vbwb8KuPOAPkmJbegxqT8oWhW5cUiPNUW8GSgLmMVSU l7Zi19NOOYLElubTDSti+YIcjk71LzuIhqzGyKVIDOUI/4uBaLu2+xUclewyTaIwrJJWD JMj4ie/txNUd3r1KTBB8dexHGPnOKMtSJ256991qt6UGhAwDjR99twVFTmKzvD1aF0PXx f4r1Mr4SKskYBk/QLF+bxhcsNFIrt5nqAeephLYGZFZ4pw2hDP8q8XTrXCihaLUJRJ6H5 DHOnKWd3o/9Np1RIgd55Czj4QsYDGUkK7B2xV4VoljIDDvWCzrz0h65ottd10ULTD8Q== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793782146; h=DMARC-Filter:X-Envelope-To:DKIM-Signature:X-Envelope-To:Received: X-Mizu-Trace-ID:X-Migadu-Flow:From:To:Cc:Subject:Date:Message-ID: X-Mailer:In-Reply-To:References:MIME-Version: Content-Transfer-Encoding; bh=AfXeCeneHqNmuixn/C9DCjk2UEGT5HCCQsR07Fy0vVk=; b=bInagB3BiaDyUWne6EJD23oGT5nkBIUFQGJbEJ3dJ94xipeT7uedECmaJHNqXgh7Jbxp +cS5IdvVowiSaYeT+erdtKeK8Hr7+gPXO0IUuW940wjZQsZnMLlrruG/MS1iRSmFouKCa JKJLeFy0Dzn8W9u+yQGP75GZk++//KRxeUpDq8C7/o5b/hpzSko2aoTpXmaj1+w7tZknE 4oB8X3649VsRSqf/x6zxXA18Jz6U7GZdZzR0JxbpeUgxcULOPOCiynHQbQtD3UTfNQXD/ Yh65gqc5icTShgV+fyzOdwM7Jogi1JnXGUbQqMNPs7dECzU3at0lDAHSgBxgiQrp8zg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=Em0M3UeR; arc=none smtp.remote-ip=95.215.58.50 Received: from mta1.migadu.com (out-50.mta1.migadu.com [95.215.58.50]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BF1DB606A336 for ; Wed, 4 Nov 2026 08:49:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org BF1DB606A336 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=Em0M3UeR X-Envelope-To: kvm@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=RoNzd28AyvTb0ibr+4xItgKDPl/EqyvaBO8VS7dD1Vo=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1793782144; v=1; x=1794386944; b=Em0M3UeRUiqmI2xQO3AQX1AGIwL2MPPAwGlOAOWn0npDGHjxDWRsJxi8mWK6g98roh4BQCwt 6YxVuA7Nw+goPeU/kVOs9oOg+M67WANy/LV5el/xHONsp06ubrvvkD52jYQuEow0w7fcrujoC2K x7pHogqI/o0p9jOvaa8JhxXU= X-Envelope-To: kvm@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id 0936b15fc4cf6f51; Wed, 04 Nov 2026 08:49:03 +0000 X-Mizu-Trace-ID: 0936b15fc4cf6f51 X-Migadu-Flow: FLOW_OUT From: Fuad Tabba To: Marc Zyngier , Oliver Upton Cc: Will Deacon , Paolo Bonzini , Sean Christopherson , Shuah Khan , Joey Gouly , Steffen Eiden , Suzuki K Poulose , Zenghui Yu , Vincent Donnefort , Quentin Perret , Fuad Tabba , kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 04/16] KVM: selftests: Export the ucall pool's guest physical address Date: Wed, 4 Nov 2026 08:48:30 +0000 Message-ID: <20261104084842.132944-5-fuad.tabba@linux.dev> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20261104084842.132944-1-fuad.tabba@linux.dev> References: <20261104084842.132944-1-fuad.tabba@linux.dev> X-Mailing-List: kvm@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit A protected guest's memory is private until the guest itself shares it, so the guest has to share the ucall pool before its first ucall. The host can't do that for it. Only the guest's copy of ucall_pool holds the pool's address. Add get_ucall_pool_gpa(), which reads that copy, so that the host can pass the address to the guest. Signed-off-by: Fuad Tabba --- tools/testing/selftests/kvm/include/ucall_common.h | 1 + tools/testing/selftests/kvm/lib/ucall_common.c | 9 ++++++++- 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/kvm/include/ucall_common.h b/tools/testing/selftests/kvm/include/ucall_common.h index cbdcb0a50c4f9..3a6cdf9aa0464 100644 --- a/tools/testing/selftests/kvm/include/ucall_common.h +++ b/tools/testing/selftests/kvm/include/ucall_common.h @@ -41,6 +41,7 @@ __printf(5, 6) void ucall_assert(u64 cmd, const char *exp, u64 get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc); void ucall_init(struct kvm_vm *vm, gpa_t mmio_gpa); int ucall_nr_pages_required(u64 page_size); +gpa_t get_ucall_pool_gpa(struct kvm_vm *vm); /* * Perform userspace call without any associated data. This bare call avoids diff --git a/tools/testing/selftests/kvm/lib/ucall_common.c b/tools/testing/selftests/kvm/lib/ucall_common.c index 029ce21f9f2fa..aa1f0f92c6d1d 100644 --- a/tools/testing/selftests/kvm/lib/ucall_common.c +++ b/tools/testing/selftests/kvm/lib/ucall_common.c @@ -21,10 +21,17 @@ int ucall_nr_pages_required(u64 page_size) /* * ucall_pool holds per-VM values (global data is duplicated by each VM), it - * must not be accessed from host code. + * must not be accessed from host code. The host reads only a VM's copy. */ static struct ucall_header *ucall_pool; +gpa_t get_ucall_pool_gpa(struct kvm_vm *vm) +{ + struct ucall_header **pool = addr_gva2hva(vm, (gva_t)&ucall_pool); + + return addr_gva2gpa(vm, (gva_t)*pool); +} + void ucall_init(struct kvm_vm *vm, gpa_t mmio_gpa) { struct ucall_header *hdr; -- 2.47.3