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Shutemov" X-Google-Original-From: "Kirill A. Shutemov" Received: by box.localdomain (Postfix, from userid 1000) id B146A10204F; Fri, 22 May 2020 15:52:19 +0300 (+03) To: Dave Hansen , Andy Lutomirski , Peter Zijlstra , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel Cc: David Rientjes , Andrea Arcangeli , Kees Cook , Will Drewry , "Edgecombe, Rick P" , "Kleen, Andi" , x86@kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: [RFC 03/16] x86/kvm: Make DMA pages shared Date: Fri, 22 May 2020 15:52:01 +0300 Message-Id: <20200522125214.31348-4-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200522125214.31348-1-kirill.shutemov@linux.intel.com> References: <20200522125214.31348-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Make force_dma_unencrypted() return true for KVM to get DMA pages mapped as shared. __set_memory_enc_dec() now informs the host via hypercall if the state of the page has changed from shared to private or back. Signed-off-by: Kirill A. Shutemov --- arch/x86/Kconfig | 1 + arch/x86/mm/mem_encrypt_common.c | 5 +++-- arch/x86/mm/pat/set_memory.c | 7 +++++++ include/uapi/linux/kvm_para.h | 2 ++ 4 files changed, 13 insertions(+), 2 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index bc72bfd89bcf..86c012582f51 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -799,6 +799,7 @@ config KVM_GUEST depends on PARAVIRT select PARAVIRT_CLOCK select ARCH_CPUIDLE_HALTPOLL + select X86_MEM_ENCRYPT_COMMON default y ---help--- This option enables various optimizations for running under the KVM diff --git a/arch/x86/mm/mem_encrypt_common.c b/arch/x86/mm/mem_encrypt_common.c index 964e04152417..a878e7f246d5 100644 --- a/arch/x86/mm/mem_encrypt_common.c +++ b/arch/x86/mm/mem_encrypt_common.c @@ -10,14 +10,15 @@ #include #include #include +#include /* Override for DMA direct allocation check - ARCH_HAS_FORCE_DMA_UNENCRYPTED */ bool force_dma_unencrypted(struct device *dev) { /* - * For SEV, all DMA must be to unencrypted/shared addresses. + * For SEV and KVM, all DMA must be to unencrypted/shared addresses. */ - if (sev_active()) + if (sev_active() || kvm_mem_protected()) return true; /* diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c index b8c55a2e402d..6f075766bb94 100644 --- a/arch/x86/mm/pat/set_memory.c +++ b/arch/x86/mm/pat/set_memory.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include @@ -1972,6 +1973,12 @@ static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc) struct cpa_data cpa; int ret; + if (kvm_mem_protected()) { + unsigned long gfn = __pa(addr) >> PAGE_SHIFT; + int call = enc ? KVM_HC_MEM_UNSHARE : KVM_HC_MEM_SHARE; + return kvm_hypercall2(call, gfn, numpages); + } + /* Nothing to do if memory encryption is not active */ if (!mem_encrypt_active()) return 0; diff --git a/include/uapi/linux/kvm_para.h b/include/uapi/linux/kvm_para.h index 1a216f32e572..c6d8c988e330 100644 --- a/include/uapi/linux/kvm_para.h +++ b/include/uapi/linux/kvm_para.h @@ -30,6 +30,8 @@ #define KVM_HC_SEND_IPI 10 #define KVM_HC_SCHED_YIELD 11 #define KVM_HC_ENABLE_MEM_PROTECTED 12 +#define KVM_HC_MEM_SHARE 13 +#define KVM_HC_MEM_UNSHARE 14 /* * hypercalls use architecture specific