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Shutemov" X-Google-Original-From: "Kirill A. Shutemov" Received: by box.localdomain (Postfix, from userid 1000) id 02FC710205A; Fri, 22 May 2020 15:52:20 +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 12/16] x86/kvm: Share steal time page with host Date: Fri, 22 May 2020 15:52:10 +0300 Message-Id: <20200522125214.31348-13-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: struct kvm_steal_time is shared between guest and host. Mark it as shared. Signed-off-by: Kirill A. Shutemov --- arch/x86/kernel/kvm.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index f50d65df4412..b0f445796ed1 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -286,11 +286,15 @@ static void kvm_register_steal_time(void) { int cpu = smp_processor_id(); struct kvm_steal_time *st = &per_cpu(steal_time, cpu); + unsigned long phys; if (!has_steal_clock) return; - wrmsrl(MSR_KVM_STEAL_TIME, (slow_virt_to_phys(st) | KVM_MSR_ENABLED)); + phys = slow_virt_to_phys(st); + if (kvm_mem_protected()) + kvm_hypercall2(KVM_HC_MEM_SHARE, phys >> PAGE_SHIFT, 1); + wrmsrl(MSR_KVM_STEAL_TIME, (phys | KVM_MSR_ENABLED)); pr_info("kvm-stealtime: cpu %d, msr %llx\n", cpu, (unsigned long long) slow_virt_to_phys(st)); }