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 650CF1E52D for ; Tue, 23 May 2023 10:18:48 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D8DA4C433EF; Tue, 23 May 2023 10:18:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1684837128; bh=Mmlqv0ANhcPLl4mKcN4ZvQAijiK59/HWKAkdzlhZNUY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YOG/dy1TcuS/tahyLHNgciz3FvfXXXj+EPq55+g5hKcLH1/WgqjBqsq+G4dvMHyZS 3tHxCJxa4YoHj1wnFvtNKugaO9l7ewXsB6/nIj3YFjIBz/dKh+Tc+RZ/iDUnQWwIIQ 6FfOuT8+LeSiG63GyeDsH4TvYTbsmNKeuHROIPRjyEDfdy4HsmzKLOdBtNBRVi/cqj Dl89l/R+hrLwww3P5zyPOJDaJvMeA7evoK2sA0cjhdUPbVEDSnZm0AA8JeKoaeEaJp 9AGzzvaVpFeHgZhOApPceK0Xq831qKThSCHcVBJQ9x9EQVkpGgwOvX33iWE9de0GnP JtASt5wcwQXLg== From: Will Deacon To: linux-arm-kernel@lists.infradead.org Cc: Will Deacon , Quentin Perret , Marc Zyngier , Oliver Upton , James Morse , Alexandru Elisei , Suzuki K Poulose , Sudeep Holla , Sebastian Ene , Fuad Tabba , kvmarm@lists.linux.dev, kernel-team@android.com, Andrew Walbran Subject: [PATCH v3 05/10] KVM: arm64: Add FF-A helpers to share/unshare memory with secure world Date: Tue, 23 May 2023 11:18:22 +0100 Message-Id: <20230523101828.7328-6-will@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20230523101828.7328-1-will@kernel.org> References: <20230523101828.7328-1-will@kernel.org> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Extend pKVM's memory protection code so that we can update the host's stage-2 page-table to track pages shared with secure world by the host using FF-A and prevent those pages from being mapped into a guest. Co-developed-by: Andrew Walbran Signed-off-by: Andrew Walbran Signed-off-by: Will Deacon --- arch/arm64/kvm/hyp/include/nvhe/mem_protect.h | 3 + arch/arm64/kvm/hyp/nvhe/mem_protect.c | 68 +++++++++++++++++++ 2 files changed, 71 insertions(+) diff --git a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h index b7bdbe63deed..0972faccc2af 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h +++ b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h @@ -57,6 +57,7 @@ extern struct host_mmu host_mmu; enum pkvm_component_id { PKVM_ID_HOST, PKVM_ID_HYP, + PKVM_ID_FFA, }; extern unsigned long hyp_nr_cpus; @@ -66,6 +67,8 @@ int __pkvm_host_share_hyp(u64 pfn); int __pkvm_host_unshare_hyp(u64 pfn); int __pkvm_host_donate_hyp(u64 pfn, u64 nr_pages); int __pkvm_hyp_donate_host(u64 pfn, u64 nr_pages); +int __pkvm_host_share_ffa(u64 pfn, u64 nr_pages); +int __pkvm_host_unshare_ffa(u64 pfn, u64 nr_pages); bool addr_is_memory(phys_addr_t phys); int host_stage2_idmap_locked(phys_addr_t addr, u64 size, enum kvm_pgtable_prot prot); diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvhe/mem_protect.c index 2e9ec4a2a4a3..e327e94d0e40 100644 --- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c +++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c @@ -842,6 +842,13 @@ static int check_share(struct pkvm_mem_share *share) case PKVM_ID_HYP: ret = hyp_ack_share(completer_addr, tx, share->completer_prot); break; + case PKVM_ID_FFA: + /* + * We only check the host; the secure side will check the other + * end when we forward the FFA call. + */ + ret = 0; + break; default: ret = -EINVAL; } @@ -870,6 +877,13 @@ static int __do_share(struct pkvm_mem_share *share) case PKVM_ID_HYP: ret = hyp_complete_share(completer_addr, tx, share->completer_prot); break; + case PKVM_ID_FFA: + /* + * We're not responsible for any secure page-tables, so there's + * nothing to do here. + */ + ret = 0; + break; default: ret = -EINVAL; } @@ -918,6 +932,10 @@ static int check_unshare(struct pkvm_mem_share *share) case PKVM_ID_HYP: ret = hyp_ack_unshare(completer_addr, tx); break; + case PKVM_ID_FFA: + /* See check_share() */ + ret = 0; + break; default: ret = -EINVAL; } @@ -946,6 +964,10 @@ static int __do_unshare(struct pkvm_mem_share *share) case PKVM_ID_HYP: ret = hyp_complete_unshare(completer_addr, tx); break; + case PKVM_ID_FFA: + /* See __do_share() */ + ret = 0; + break; default: ret = -EINVAL; } @@ -1235,3 +1257,49 @@ void hyp_unpin_shared_mem(void *from, void *to) hyp_unlock_component(); host_unlock_component(); } + +int __pkvm_host_share_ffa(u64 pfn, u64 nr_pages) +{ + int ret; + struct pkvm_mem_share share = { + .tx = { + .nr_pages = nr_pages, + .initiator = { + .id = PKVM_ID_HOST, + .addr = hyp_pfn_to_phys(pfn), + }, + .completer = { + .id = PKVM_ID_FFA, + }, + }, + }; + + host_lock_component(); + ret = do_share(&share); + host_unlock_component(); + + return ret; +} + +int __pkvm_host_unshare_ffa(u64 pfn, u64 nr_pages) +{ + int ret; + struct pkvm_mem_share share = { + .tx = { + .nr_pages = nr_pages, + .initiator = { + .id = PKVM_ID_HOST, + .addr = hyp_pfn_to_phys(pfn), + }, + .completer = { + .id = PKVM_ID_FFA, + }, + }, + }; + + host_lock_component(); + ret = do_unshare(&share); + host_unlock_component(); + + return ret; +} -- 2.40.1.698.g37aff9b760-goog