linux-kernel - [RFC PATCH 10/13] softmmu/physmem: Add private memory address space

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Date:   Thu, 11 Nov 2021 22:13:49 +0800
From:   Chao Peng <chao.p.peng@...ux.intel.com>
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        qemu-devel@...gnu.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>,
        Hugh Dickins <hughd@...gle.com>,
        Jeff Layton <jlayton@...nel.org>,
        "J . Bruce Fields" <bfields@...ldses.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Yu Zhang <yu.c.zhang@...ux.intel.com>,
        Chao Peng <chao.p.peng@...ux.intel.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        luto@...nel.org, john.ji@...el.com, susie.li@...el.com,
        jun.nakajima@...el.com, dave.hansen@...el.com, ak@...ux.intel.com,
        david@...hat.com
Subject: [RFC PATCH 10/13] softmmu/physmem: Add private memory address space

Signed-off-by: Chao Peng <chao.p.peng@...ux.intel.com>
---
 include/exec/address-spaces.h |  2 ++
 softmmu/physmem.c             | 13 +++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/include/exec/address-spaces.h b/include/exec/address-spaces.h
index db8bfa9a92..b3f45001c0 100644
--- a/include/exec/address-spaces.h
+++ b/include/exec/address-spaces.h
@@ -27,6 +27,7 @@
  * until a proper bus interface is available.
  */
 MemoryRegion *get_system_memory(void);
+MemoryRegion *get_system_private_memory(void);
 
 /* Get the root I/O port region.  This interface should only be used
  * temporarily until a proper bus interface is available.
@@ -34,6 +35,7 @@ MemoryRegion *get_system_memory(void);
 MemoryRegion *get_system_io(void);
 
 extern AddressSpace address_space_memory;
+extern AddressSpace address_space_private_memory;
 extern AddressSpace address_space_io;
 
 #endif
diff --git a/softmmu/physmem.c b/softmmu/physmem.c
index f4d6eeaa17..a2d339fd88 100644
--- a/softmmu/physmem.c
+++ b/softmmu/physmem.c
@@ -85,10 +85,13 @@
 RAMList ram_list = { .blocks = QLIST_HEAD_INITIALIZER(ram_list.blocks) };
 
 static MemoryRegion *system_memory;
+static MemoryRegion *system_private_memory;
 static MemoryRegion *system_io;
 
 AddressSpace address_space_io;
 AddressSpace address_space_memory;
+AddressSpace address_space_private_memory;
+
 
 static MemoryRegion io_mem_unassigned;
 
@@ -2669,6 +2672,11 @@ static void memory_map_init(void)
     memory_region_init(system_memory, NULL, "system", UINT64_MAX);
     address_space_init(&address_space_memory, system_memory, "memory");
 
+    system_private_memory = g_malloc(sizeof(*system_private_memory));
+
+    memory_region_init(system_private_memory, NULL, "system-private", UINT64_MAX);
+    address_space_init(&address_space_private_memory, system_private_memory, "private-memory");
+
     system_io = g_malloc(sizeof(*system_io));
     memory_region_init_io(system_io, NULL, &unassigned_io_ops, NULL, "io",
                           65536);
@@ -2680,6 +2688,11 @@ MemoryRegion *get_system_memory(void)
     return system_memory;
 }
 
+MemoryRegion *get_system_private_memory(void)
+{
+    return system_private_memory;
+}
+
 MemoryRegion *get_system_io(void)
 {
     return system_io;
-- 
2.17.1