diff options
author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-01-19 04:09:41 +0300 |
---|---|---|
committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-03-03 19:52:48 +0300 |
commit | 6eaa412f2753d98566b777836a98c6e7f672a3bb (patch) | |
tree | 4d819877284ec1aa154f23416c2d6328556e7b7a /arch/x86/xen/setup.c | |
parent | 1bae4ce27c9c90344f23c65ea6966c50ffeae2f5 (diff) | |
download | linux-6eaa412f2753d98566b777836a98c6e7f672a3bb.tar.xz |
xen: Mark all initial reserved pages for the balloon as INVALID_P2M_ENTRY.
With this patch, we diligently set regions that will be used by the
balloon driver to be INVALID_P2M_ENTRY and under the ownership
of the balloon driver. We are OK using the __set_phys_to_machine
as we do not expect to be allocating any P2M middle or entries pages.
The set_phys_to_machine has the side-effect of potentially allocating
new pages and we do not want that at this stage.
We can do this because xen_build_mfn_list_list will have already
allocated all such pages up to xen_max_p2m_pfn.
We also move the check for auto translated physmap down the
stack so it is present in __set_phys_to_machine.
[v2: Rebased with mmu->p2m code split]
Reviewed-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'arch/x86/xen/setup.c')
-rw-r--r-- | arch/x86/xen/setup.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c index b5a7f928234b..7201800e55a4 100644 --- a/arch/x86/xen/setup.c +++ b/arch/x86/xen/setup.c @@ -52,6 +52,8 @@ phys_addr_t xen_extra_mem_start, xen_extra_mem_size; static __init void xen_add_extra_mem(unsigned long pages) { + unsigned long pfn; + u64 size = (u64)pages * PAGE_SIZE; u64 extra_start = xen_extra_mem_start + xen_extra_mem_size; @@ -66,6 +68,9 @@ static __init void xen_add_extra_mem(unsigned long pages) xen_extra_mem_size += size; xen_max_p2m_pfn = PFN_DOWN(extra_start + size); + + for (pfn = PFN_DOWN(extra_start); pfn <= xen_max_p2m_pfn; pfn++) + __set_phys_to_machine(pfn, INVALID_P2M_ENTRY); } static unsigned long __init xen_release_chunk(phys_addr_t start_addr, @@ -104,7 +109,7 @@ static unsigned long __init xen_release_chunk(phys_addr_t start_addr, WARN(ret != 1, "Failed to release memory %lx-%lx err=%d\n", start, end, ret); if (ret == 1) { - set_phys_to_machine(pfn, INVALID_P2M_ENTRY); + __set_phys_to_machine(pfn, INVALID_P2M_ENTRY); len++; } } |