From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 C44D81DF726; Wed, 6 Nov 2024 12:21:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730895700; cv=none; b=TOLgJtm9k8Fv7V+9bim9eXxwBhExYZrAP46mXiDMfT10g7Cca7EfBc6EwIyGHZx6+9psCV21NUr3fj7z7HqcGeDVO4n4Bgn2WaWl6ybTCd0Po4LglKtpoOOet/YXnOoHPAeRnXPIaqnAg4nDwAENxtaqn41LEQYtLVrW23pHxrk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730895700; c=relaxed/simple; bh=m37pfgZv7fQgq/egABhUI3SeSzNcTXUhlnJWrYWsrLY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QSFPRGPkEOeCjhJXeQEoSuMb0el6noyRuAdvjForC/PAH4puFsMekYpwahAJNWZuMjEyb47dXPKKDHi9qRDGqFF8uuKQ0NsuuheIb/NiIJZTkxKYKL2Kp9RNZ9Jlhr58GTP1gL9rZ1vrhgdGFpGA0nKAyNOKTGmcObYAFxDtgcE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=AZLlQrt2; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="AZLlQrt2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4661BC4CECD; Wed, 6 Nov 2024 12:21:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1730895700; bh=m37pfgZv7fQgq/egABhUI3SeSzNcTXUhlnJWrYWsrLY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AZLlQrt2gOOw7HVt37eifulzzFTrGGhEW52JL1a/gKU7yZt37cPanmEibl6EGnI1D b8ujxxpzutYaatKWZHgw0CkKPt1JOeGo62Z3p+wC5U/j4VBDvmlzGPBCOlZ3KA+DYs GQwqJthrUslytR/25tS9rQC9jHVCQPjJvGxnKreM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Janis Schoetterl-Glausch , Janosch Frank , David Hildenbrand , Claudio Imbrenda , Sasha Levin Subject: [PATCH 4.19 306/350] KVM: s390: gaccess: Cleanup access to guest pages Date: Wed, 6 Nov 2024 13:03:54 +0100 Message-ID: <20241106120328.346229341@linuxfoundation.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241106120320.865793091@linuxfoundation.org> References: <20241106120320.865793091@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Janis Schoetterl-Glausch [ Upstream commit bad13799e0305deb258372b7298a86be4c78aaba ] Introduce a helper function for guest frame access. Signed-off-by: Janis Schoetterl-Glausch Reviewed-by: Janosch Frank Reviewed-by: David Hildenbrand Reviewed-by: Claudio Imbrenda Message-Id: <20211126164549.7046-4-scgl@linux.ibm.com> Signed-off-by: Janosch Frank Stable-dep-of: e8061f06185b ("KVM: s390: gaccess: Check if guest address is in memslot") Signed-off-by: Sasha Levin --- arch/s390/kvm/gaccess.c | 24 ++++++++++++++++-------- 1 file changed, 16 insertions(+), 8 deletions(-) diff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c index d4fe5db5984dd..6ba82fe0776f8 100644 --- a/arch/s390/kvm/gaccess.c +++ b/arch/s390/kvm/gaccess.c @@ -866,6 +866,20 @@ static int guest_range_to_gpas(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, return 0; } +static int access_guest_page(struct kvm *kvm, enum gacc_mode mode, gpa_t gpa, + void *data, unsigned int len) +{ + const unsigned int offset = offset_in_page(gpa); + const gfn_t gfn = gpa_to_gfn(gpa); + int rc; + + if (mode == GACC_STORE) + rc = kvm_write_guest_page(kvm, gfn, data, offset, len); + else + rc = kvm_read_guest_page(kvm, gfn, data, offset, len); + return rc; +} + int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, void *data, unsigned long len, enum gacc_mode mode) { @@ -896,10 +910,7 @@ int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, void *data, rc = guest_range_to_gpas(vcpu, ga, ar, gpas, len, asce, mode); for (idx = 0; idx < nr_pages && !rc; idx++) { fragment_len = min(PAGE_SIZE - offset_in_page(gpas[idx]), len); - if (mode == GACC_STORE) - rc = kvm_write_guest(vcpu->kvm, gpas[idx], data, fragment_len); - else - rc = kvm_read_guest(vcpu->kvm, gpas[idx], data, fragment_len); + rc = access_guest_page(vcpu->kvm, mode, gpas[idx], data, fragment_len); len -= fragment_len; data += fragment_len; } @@ -920,10 +931,7 @@ int access_guest_real(struct kvm_vcpu *vcpu, unsigned long gra, while (len && !rc) { gpa = kvm_s390_real_to_abs(vcpu, gra); fragment_len = min(PAGE_SIZE - offset_in_page(gpa), len); - if (mode) - rc = write_guest_abs(vcpu, gpa, data, fragment_len); - else - rc = read_guest_abs(vcpu, gpa, data, fragment_len); + rc = access_guest_page(vcpu->kvm, mode, gpa, data, fragment_len); len -= fragment_len; gra += fragment_len; data += fragment_len; -- 2.43.0