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From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Dave Hansen <dave.hansen@linux.intel.com>,
	Andy Lutomirski <luto@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Sean Christopherson <sean.j.christopherson@intel.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>
Cc: David Rientjes <rientjes@google.com>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Kees Cook <keescook@chromium.org>, Will Drewry <wad@chromium.org>,
	"Edgecombe, Rick P" <rick.p.edgecombe@intel.com>,
	"Kleen, Andi" <andi.kleen@intel.com>,
	x86@kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
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> (raw)
In-Reply-To: <20200522125214.31348-1-kirill.shutemov@linux.intel.com>

struct kvm_steal_time is shared between guest and host. Mark it as
shared.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 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));
 }
-- 
2.26.2


  parent reply index

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-22 12:51 [RFC 00/16] KVM protected memory extension Kirill A. Shutemov
2020-05-22 12:51 ` [RFC 01/16] x86/mm: Move force_dma_unencrypted() to common code Kirill A. Shutemov
2020-05-22 12:52 ` [RFC 02/16] x86/kvm: Introduce KVM memory protection feature Kirill A. Shutemov
2020-05-25 14:58   ` Vitaly Kuznetsov
2020-05-25 15:15     ` Kirill A. Shutemov
2020-05-27  5:03       ` Sean Christopherson
2020-05-27  8:39         ` Vitaly Kuznetsov
2020-05-27  8:52           ` Sean Christopherson
2020-06-03  2:09           ` Huang, Kai
2020-06-03 11:14             ` Vitaly Kuznetsov
2020-05-22 12:52 ` [RFC 03/16] x86/kvm: Make DMA pages shared Kirill A. Shutemov
2020-05-22 12:52 ` [RFC 04/16] x86/kvm: Use bounce buffers for KVM memory protection Kirill A. Shutemov
2020-05-22 12:52 ` [RFC 05/16] x86/kvm: Make VirtIO use DMA API in KVM guest Kirill A. Shutemov
2020-05-22 12:52 ` [RFC 06/16] KVM: Use GUP instead of copy_from/to_user() to access guest memory Kirill A. Shutemov
2020-05-25 15:08   ` Vitaly Kuznetsov
2020-05-25 15:17     ` Kirill A. Shutemov
2020-06-01 16:35       ` Paolo Bonzini
2020-06-02 13:33         ` Kirill A. Shutemov
2020-05-26  6:14   ` Mike Rapoport
2020-05-26 21:56     ` Kirill A. Shutemov
2020-05-29 15:24   ` Kees Cook
2020-05-22 12:52 ` [RFC 07/16] KVM: mm: Introduce VM_KVM_PROTECTED Kirill A. Shutemov
2020-05-26  6:15   ` Mike Rapoport
2020-05-26 22:01     ` Kirill A. Shutemov
2020-05-26  6:40   ` John Hubbard
2020-05-26 22:04     ` Kirill A. Shutemov
2020-05-22 12:52 ` [RFC 08/16] KVM: x86: Use GUP for page walk instead of __get_user() Kirill A. Shutemov
2020-05-22 12:52 ` [RFC 09/16] KVM: Protected memory extension Kirill A. Shutemov
2020-05-25 15:26   ` Vitaly Kuznetsov
2020-05-25 15:34     ` Kirill A. Shutemov
2020-06-03  1:34       ` Huang, Kai
2020-05-22 12:52 ` [RFC 10/16] KVM: x86: Enabled protected " Kirill A. Shutemov
2020-05-25 15:26   ` Vitaly Kuznetsov
2020-05-26  6:16   ` Mike Rapoport
2020-05-26 21:58     ` Kirill A. Shutemov
2020-05-22 12:52 ` [RFC 11/16] KVM: Rework copy_to/from_guest() to avoid direct mapping Kirill A. Shutemov
2020-05-22 12:52 ` Kirill A. Shutemov [this message]
2020-05-22 12:52 ` [RFC 13/16] x86/kvmclock: Share hvclock memory with the host Kirill A. Shutemov
2020-05-25 15:22   ` Vitaly Kuznetsov
2020-05-25 15:25     ` Kirill A. Shutemov
2020-05-25 15:42       ` Vitaly Kuznetsov
2020-05-22 12:52 ` [RFC 14/16] KVM: Introduce gfn_to_pfn_memslot_protected() Kirill A. Shutemov
2020-05-22 12:52 ` [RFC 15/16] KVM: Handle protected memory in __kvm_map_gfn()/__kvm_unmap_gfn() Kirill A. Shutemov
2020-05-22 12:52 ` [RFC 16/16] KVM: Unmap protected pages from direct mapping Kirill A. Shutemov
2020-05-26  6:16   ` Mike Rapoport
2020-05-26 22:10     ` Kirill A. Shutemov
2020-05-25  5:27 ` [RFC 00/16] KVM protected memory extension Kirill A. Shutemov
2020-05-25 13:47 ` Liran Alon
2020-05-25 14:46   ` Kirill A. Shutemov
2020-05-25 15:56     ` Liran Alon
2020-05-26  6:17   ` Mike Rapoport
2020-05-26 10:16     ` Liran Alon
2020-05-26 11:38       ` Mike Rapoport
2020-05-27 15:45         ` Dave Hansen
2020-05-27 21:22           ` Mike Rapoport
2020-06-04 15:15 ` Marc Zyngier
2020-06-04 15:48   ` Sean Christopherson
2020-06-04 16:27     ` Marc Zyngier
2020-06-04 16:35     ` Will Deacon
2020-06-04 19:09       ` Nakajima, Jun
2020-06-04 21:03         ` Jim Mattson
2020-06-04 23:29           ` Nakajima, Jun

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