[EMAIL PROTECTED] wrote:
> From: Ben-Ami Yassour <[EMAIL PROTECTED]>
>
> Signed-off-by: Ben-Ami Yassour <[EMAIL PROTECTED]>
> Signed-off-by: Muli Ben-Yehuda <[EMAIL PROTECTED]>
> ---
> arch/x86/kvm/mmu.c | 59 +++++++++++++++++++++++++++++--------------
> arch/x86/kvm/paging_tmpl.h | 19 +++++++++----
> include/linux/kvm_host.h | 2 +-
> virt/kvm/kvm_main.c | 17 +++++++++++-
> 4 files changed, 69 insertions(+), 28 deletions(-)
>
> diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
> index 078a7f1..c89029d 100644
> --- a/arch/x86/kvm/mmu.c
> +++ b/arch/x86/kvm/mmu.c
> @@ -112,6 +112,8 @@ static int dbg = 1;
> #define PT_FIRST_AVAIL_BITS_SHIFT 9
> #define PT64_SECOND_AVAIL_BITS_SHIFT 52
>
> +#define PT_SHADOW_IO_MARK (1ULL << PT_FIRST_AVAIL_BITS_SHIFT)
> +
>
Please rename this PT_SHADOW_MMIO_MASK.
> #define VALID_PAGE(x) ((x) != INVALID_PAGE)
>
> #define PT64_LEVEL_BITS 9
> @@ -237,6 +239,9 @@ static int is_dirty_pte(unsigned long pte)
>
> static int is_rmap_pte(u64 pte)
> {
> + if (pte & PT_SHADOW_IO_MARK)
> + return false;
> +
> return is_shadow_present_pte(pte);
> }
>
Why avoid rmap on mmio pages? Sure it's unnecessary work, but having
less cases improves overall reliability.
You can use pfn_valid() in gfn_to_pfn() and kvm_release_pfn_*() to
conditionally update the page refcounts.
--
Any sufficiently difficult bug is indistinguishable from a feature.
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