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Paul Mackerras 1cc8ed0b13 KVM: PPC: Book3S HV: Don't give the guest RW access to RO pages 
Currently, if the guest does an H_PROTECT hcall requesting that the
permissions on a HPT entry be changed to allow writing, we make the
requested change even if the page is marked read-only in the host
Linux page tables.  This is a problem since it would for instance
allow a guest to modify a page that KSM has decided can be shared
between multiple guests.

To fix this, if the new permissions for the page allow writing, we need
to look up the memslot for the page, work out the host virtual address,
and look up the Linux page tables to get the PTE for the page.  If that
PTE is read-only, we reduce the HPTE permissions to read-only.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
2012-12-06 01:34:00 +01:00
..
boot Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2012-10-06 03:16:12 +09:00
configs UAPI Disintegration 2012-10-09 2012-10-09 15:04:25 +01:00
include KVM: PPC: Book3S HV: Provide a method for userspace to read and write the HPT 2012-12-06 01:33:57 +01:00
kernel Merge commit 'origin/queue' into for-queue 2012-10-31 13:36:18 +01:00
kvm KVM: PPC: Book3S HV: Don't give the guest RW access to RO pages 2012-12-06 01:34:00 +01:00
lib powerpc: Fix VMX fix for memcpy case 2012-10-04 18:02:43 +10:00
math-emu
mm readahead: fault retry breaks mmap file read random detection 2012-10-09 16:22:47 +09:00
net
oprofile mm: use mm->exe_file instead of first VM_EXECUTABLE vma->vm_file 2012-10-09 16:22:18 +09:00
perf Revert "powerpc/perf: Use pmc_overflow() to detect rolled back events" 2012-10-18 10:36:11 +11:00
platforms Merge remote-tracking branch 'master' into queue 2012-10-29 19:15:32 -02:00
sysdev Merge remote-tracking branch 'master' into queue 2012-10-29 19:15:32 -02:00
xmon powerpc: Add an xmon command to dump one or all pacas 2012-09-18 15:02:36 +10:00
Kconfig Merge branch 'modules-next' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux 2012-10-14 13:39:34 -07:00
Kconfig.debug
Makefile
relocs_check.pl