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Shutemov" To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org Cc: "Rafael J. Wysocki" , Peter Zijlstra , Adrian Hunter , Kuppuswamy Sathyanarayanan , Elena Reshetova , Jun Nakajima , Rick Edgecombe , Tom Lendacky , "Kalra, Ashish" , Sean Christopherson , "Huang, Kai" , Baoquan He , kexec@lists.infradead.org, linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: [PATCHv2 06/13] x86/mm: Make x86_platform.guest.enc_status_change_*() return errno Date: Fri, 20 Oct 2023 18:12:35 +0300 Message-ID: <20231020151242.1814-7-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231020151242.1814-1-kirill.shutemov@linux.intel.com> References: <20231020151242.1814-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231020_081329_618605_07F0FE94 X-CRM114-Status: GOOD ( 17.45 ) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org TDX is going to have more than one reason to fail enc_status_change_prepare(). Change the callback to return errno instead of assuming -EIO; enc_status_change_finish() changed too to keep the interface symmetric. Signed-off-by: Kirill A. Shutemov --- arch/x86/coco/tdx/tdx.c | 20 +++++++++++--------- arch/x86/hyperv/ivm.c | 9 +++------ arch/x86/include/asm/x86_init.h | 4 ++-- arch/x86/kernel/x86_init.c | 4 ++-- arch/x86/mm/mem_encrypt_amd.c | 8 ++++---- arch/x86/mm/pat/set_memory.c | 9 +++++---- 6 files changed, 27 insertions(+), 27 deletions(-) diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c index d11206ceff3b..8897d3cc8a15 100644 --- a/arch/x86/coco/tdx/tdx.c +++ b/arch/x86/coco/tdx/tdx.c @@ -776,28 +776,30 @@ static bool tdx_enc_status_changed(unsigned long vaddr, int numpages, bool enc) return true; } -static bool tdx_enc_status_change_prepare(unsigned long vaddr, int numpages, - bool enc) +static int tdx_enc_status_change_prepare(unsigned long vaddr, int numpages, + bool enc) { /* * Only handle shared->private conversion here. * See the comment in tdx_early_init(). */ - if (enc) - return tdx_enc_status_changed(vaddr, numpages, enc); - return true; + if (enc && !tdx_enc_status_changed(vaddr, numpages, enc)) + return -EIO; + + return 0; } -static bool tdx_enc_status_change_finish(unsigned long vaddr, int numpages, +static int tdx_enc_status_change_finish(unsigned long vaddr, int numpages, bool enc) { /* * Only handle private->shared conversion here. * See the comment in tdx_early_init(). */ - if (!enc) - return tdx_enc_status_changed(vaddr, numpages, enc); - return true; + if (!enc && !tdx_enc_status_changed(vaddr, numpages, enc)) + return -EIO; + + return 0; } void __init tdx_early_init(void) diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c index c1088d3661d5..7d2241059d49 100644 --- a/arch/x86/hyperv/ivm.c +++ b/arch/x86/hyperv/ivm.c @@ -510,13 +510,12 @@ static int hv_mark_gpa_visibility(u16 count, const u64 pfn[], * with host. This function works as wrap of hv_mark_gpa_visibility() * with memory base and size. */ -static bool hv_vtom_set_host_visibility(unsigned long kbuffer, int pagecount, bool enc) +static int hv_vtom_set_host_visibility(unsigned long kbuffer, int pagecount, bool enc) { enum hv_mem_host_visibility visibility = enc ? VMBUS_PAGE_NOT_VISIBLE : VMBUS_PAGE_VISIBLE_READ_WRITE; u64 *pfn_array; int ret = 0; - bool result = true; int i, pfn; pfn_array = kmalloc(HV_HYP_PAGE_SIZE, GFP_KERNEL); @@ -530,17 +529,15 @@ static bool hv_vtom_set_host_visibility(unsigned long kbuffer, int pagecount, bo if (pfn == HV_MAX_MODIFY_GPA_REP_COUNT || i == pagecount - 1) { ret = hv_mark_gpa_visibility(pfn, pfn_array, visibility); - if (ret) { - result = false; + if (ret) goto err_free_pfn_array; - } pfn = 0; } } err_free_pfn_array: kfree(pfn_array); - return result; + return ret; } static bool hv_vtom_tlb_flush_required(bool private) diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h index 5240d88db52a..5031cbc6e211 100644 --- a/arch/x86/include/asm/x86_init.h +++ b/arch/x86/include/asm/x86_init.h @@ -150,8 +150,8 @@ struct x86_init_acpi { * @enc_cache_flush_required Returns true if a cache flush is needed before changing page encryption status */ struct x86_guest { - bool (*enc_status_change_prepare)(unsigned long vaddr, int npages, bool enc); - bool (*enc_status_change_finish)(unsigned long vaddr, int npages, bool enc); + int (*enc_status_change_prepare)(unsigned long vaddr, int npages, bool enc); + int (*enc_status_change_finish)(unsigned long vaddr, int npages, bool enc); bool (*enc_tlb_flush_required)(bool enc); bool (*enc_cache_flush_required)(void); }; diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c index a37ebd3b4773..f0f54e109eb9 100644 --- a/arch/x86/kernel/x86_init.c +++ b/arch/x86/kernel/x86_init.c @@ -131,8 +131,8 @@ struct x86_cpuinit_ops x86_cpuinit = { static void default_nmi_init(void) { }; -static bool enc_status_change_prepare_noop(unsigned long vaddr, int npages, bool enc) { return true; } -static bool enc_status_change_finish_noop(unsigned long vaddr, int npages, bool enc) { return true; } +static int enc_status_change_prepare_noop(unsigned long vaddr, int npages, bool enc) { return 0; } +static int enc_status_change_finish_noop(unsigned long vaddr, int npages, bool enc) { return 0; } static bool enc_tlb_flush_required_noop(bool enc) { return false; } static bool enc_cache_flush_required_noop(void) { return false; } static bool is_private_mmio_noop(u64 addr) {return false; } diff --git a/arch/x86/mm/mem_encrypt_amd.c b/arch/x86/mm/mem_encrypt_amd.c index a68f2dda0948..6cf6cc8ae6a6 100644 --- a/arch/x86/mm/mem_encrypt_amd.c +++ b/arch/x86/mm/mem_encrypt_amd.c @@ -282,7 +282,7 @@ static void enc_dec_hypercall(unsigned long vaddr, unsigned long size, bool enc) #endif } -static bool amd_enc_status_change_prepare(unsigned long vaddr, int npages, bool enc) +static int amd_enc_status_change_prepare(unsigned long vaddr, int npages, bool enc) { /* * To maintain the security guarantees of SEV-SNP guests, make sure @@ -291,11 +291,11 @@ static bool amd_enc_status_change_prepare(unsigned long vaddr, int npages, bool if (cc_platform_has(CC_ATTR_GUEST_SEV_SNP) && !enc) snp_set_memory_shared(vaddr, npages); - return true; + return 0; } /* Return true unconditionally: return value doesn't matter for the SEV side */ -static bool amd_enc_status_change_finish(unsigned long vaddr, int npages, bool enc) +static int amd_enc_status_change_finish(unsigned long vaddr, int npages, bool enc) { /* * After memory is mapped encrypted in the page table, validate it @@ -307,7 +307,7 @@ static bool amd_enc_status_change_finish(unsigned long vaddr, int npages, bool e if (!cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT)) enc_dec_hypercall(vaddr, npages << PAGE_SHIFT, enc); - return true; + return 0; } static void __init __set_clr_pte_enc(pte_t *kpte, int level, bool enc) diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c index bda9f129835e..6fbf22d5fa56 100644 --- a/arch/x86/mm/pat/set_memory.c +++ b/arch/x86/mm/pat/set_memory.c @@ -2152,8 +2152,9 @@ static int __set_memory_enc_pgtable(unsigned long addr, int numpages, bool enc) cpa_flush(&cpa, x86_platform.guest.enc_cache_flush_required()); /* Notify hypervisor that we are about to set/clr encryption attribute. */ - if (!x86_platform.guest.enc_status_change_prepare(addr, numpages, enc)) - return -EIO; + ret = x86_platform.guest.enc_status_change_prepare(addr, numpages, enc); + if (ret) + return ret; ret = __change_page_attr_set_clr(&cpa, 1); @@ -2168,8 +2169,8 @@ static int __set_memory_enc_pgtable(unsigned long addr, int numpages, bool enc) /* Notify hypervisor that we have successfully set/clr encryption attribute. */ if (!ret) { - if (!x86_platform.guest.enc_status_change_finish(addr, numpages, enc)) - ret = -EIO; + ret = x86_platform.guest.enc_status_change_finish(addr, + numpages, enc); } return ret; -- 2.41.0 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec