From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794063684; b=lAVFN85N22DrtNE/8bu3f7WbWEIxUDVIJ2m3mVOaBIPIPd9ose3q++gn2oUuAjuiOf98 YIPj/RY94zdjW74APjhRf9ifd47Vr2kHrEDaVUUMeKTOmyNqhHx8tDp/YQ+fqX4ka3UYQ RdGqSny2bP+e5kMxWPP0QyPTC00BY4rdf73wso1yZRsP+FJxemYdHNqnme1muzkxg+afj QuJUjJcULTMhS0mrKV3vfKevA9nsRD8dgAiJZn7xIvHCvGYOHweIXFEJxH7AI5NfZU0tC JK5OAtWvjcR1z1WoJYaR5kISuDgLQzMdd10Vd2HySNTVZotTFLqJC0wI3kgnnmdfmvA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794063684; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=9vPZr5FLn8D2zcHSUgGqYnnTfdnx2H5gkjTrq5gxxfc=; b=pVNfxQLxWGedaj4QrHfTWKfXusblx9W4jjmpSuhGdgaJdNHkdk+hxdEz03tt15wRJ0Jm uvXEBz+e7kxEVHkfSX/IlFKWUE2cv8P1d4u3XJUqlDv8itOMXI8vlm/p1yj13Y0YpLSUj P/37D5IgFhu4lXnXsba8oGR/g25SHuA5skNVCE6vRjCTT39ZNYvv4YIyBSidjvEWkcgOT TtQ7WAgtolrZQpCzQUvTZ/McRfbhWs8mfAbZePPh3oJl9XWZTjzmmX78hxth0MVdjJshZ vYf/kML3i95brmu8eRlAIJcFchlcwHvgVjYRbazzCLa7g8BLJSgtV7FAyHmsW9nIPdQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=onFl7KWW; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 667B4606A33C; Sat, 7 Nov 2026 15:01:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=onFl7KWW Received: by smtp.kernel.org (Postfix) with ESMTPSA id CDA891F0089F; Sat, 7 Nov 2026 15:01:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1794063684; bh=9vPZr5FLn8D2zcHSUgGqYnnTfdnx2H5gkjTrq5gxxfc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=onFl7KWWjhAr+NQ+lMRNv2edvB6k2Q/Hn6Pwf/Ugnt8Al9nCafsL/62bsKmt1m9qE dfw29OwFhi0d1LnWBAwuVJbVhTJ4cSlEEY5i++adFspCahA+KBqgqidXjzjL0K0I52 xsfCXtKa/SSuUo++6YMp7t6zRFR5PyOY2NDxJE48= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Fuad Tabba , Marc Zyngier , Sasha Levin Subject: [PATCH 6.18 765/869] KVM: arm64: Set HCR_EL2.BSU to Inner Shareable for guests Date: Sat, 7 Nov 2026 08:57:27 -0500 Message-ID: <20261107134918.651115518@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261107134852.069646174@linuxfoundation.org> References: <20261107134852.069646174@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: stable@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 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Fuad Tabba [ Upstream commit 00e73757518020273ccf6308a51f214e58c21ad5 ] KVM sets HCR_EL2.BSU to Inner Shareable for guests, so that a guest's barriers cover the TLB and I-cache invalidations that HCR_EL2.FB broadcasts. However, since HCR_BSU_IS became an alias of the generated HCR_EL2_BSU_IS, it is the unshifted field value 0b01, which sets bit 0 (VM, already set) and leaves BSU at 0b00. A guest's DSB NSH is then not required to wait for a broadcast TLBI to complete on other CPUs. Build the field with SYS_FIELD_PREP_ENUM(). Fixes: d0f39259eff4 ("arm64: sysreg: Add layout for HCR_EL2") Signed-off-by: Fuad Tabba Link: https://patch.msgid.link/20261016081558.805411-1-fuad.tabba@linux.dev Signed-off-by: Marc Zyngier Cc: stable@vger.kernel.org Signed-off-by: Sasha Levin --- arch/arm64/include/asm/kvm_arm.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h index 1da290aeedce7..641276868a653 100644 --- a/arch/arm64/include/asm/kvm_arm.h +++ b/arch/arm64/include/asm/kvm_arm.h @@ -98,7 +98,7 @@ * TID1: Trap REVIDR_EL1, AIDR_EL1, and SMIDR_EL1 */ #define HCR_GUEST_FLAGS (HCR_TSC | HCR_TSW | HCR_TWE | HCR_TWI | HCR_VM | \ - HCR_BSU_IS | HCR_FB | HCR_TACR | \ + SYS_FIELD_PREP_ENUM(HCR_EL2, BSU, IS) | HCR_EL2_FB | HCR_EL2_TACR | \ HCR_AMO | HCR_SWIO | HCR_TIDCP | HCR_RW | HCR_TLOR | \ HCR_FMO | HCR_IMO | HCR_PTW | HCR_TID3 | HCR_TID1) #define HCR_HOST_NVHE_FLAGS (HCR_RW | HCR_API | HCR_APK | HCR_ATA) -- 2.53.0