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KVM: x86: ensure emulator fetches do not span multiple pages
authorPaolo Bonzini <pbonzini@redhat.com>
Thu, 19 Jun 2014 09:37:06 +0000 (11:37 +0200)
committerPaolo Bonzini <pbonzini@redhat.com>
Fri, 11 Jul 2014 07:14:04 +0000 (09:14 +0200)
commit719d5a9b2487e0562f178f61e323c3dc18a8b200
tree677713d985ffab18b25867d48ddc52a6c9bf4164tree | snapshot (tar.gz zip)
parent17052f16a51af6d8f4b7eee0631af675ac204f65commit | diff
KVM: x86: ensure emulator fetches do not span multiple pages

When the CS base is not page-aligned, the linear address of the code could
get close to the page boundary (e.g. 0x...ffe) even if the EIP value is
not.  So we need to first linearize the address, and only then compute
the number of valid bytes that can be fetched.

This happens relatively often when executing real mode code.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
arch/x86/kvm/emulate.c diff | blob | blame | history