Using sp->role.level instead of @level since @level is not got from the
page table hierarchy
There is no issue in current code since the fast page fault currently only
fixes the fault caused by dirty-log that is always on the last level
(level = 1)
This patch makes the code more readable and avoids potential issue in the
further development
Signed-off-by: Xiao Guangrong <xiaoguangr...@linux.vnet.ibm.com>
---
arch/x86/kvm/mmu.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 7714fd8..869f1db 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2804,9 +2804,9 @@ static bool page_fault_can_be_fast(u32 error_code)
}
static bool
-fast_pf_fix_direct_spte(struct kvm_vcpu *vcpu, u64 *sptep, u64 spte)
+fast_pf_fix_direct_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
+ u64 *sptep, u64 spte)
{
- struct kvm_mmu_page *sp = page_header(__pa(sptep));
gfn_t gfn;
WARN_ON(!sp->role.direct);
@@ -2832,6 +2832,7 @@ static bool fast_page_fault(struct kvm_vcpu *vcpu, gva_t
gva, int level,
u32 error_code)
{
struct kvm_shadow_walk_iterator iterator;
+ struct kvm_mmu_page *sp;
bool ret = false;
u64 spte = 0ull;
@@ -2852,7 +2853,8 @@ static bool fast_page_fault(struct kvm_vcpu *vcpu, gva_t
gva, int level,
goto exit;
}
- if (!is_last_spte(spte, level))
+ sp = page_header(__pa(iterator.sptep));
+ if (!is_last_spte(spte, sp->role.level))
goto exit;
/*
@@ -2878,7 +2880,7 @@ static bool fast_page_fault(struct kvm_vcpu *vcpu, gva_t
gva, int level,
* the gfn is not stable for indirect shadow page.
* See Documentation/virtual/kvm/locking.txt to get more detail.
*/
- ret = fast_pf_fix_direct_spte(vcpu, iterator.sptep, spte);
+ ret = fast_pf_fix_direct_spte(vcpu, sp, iterator.sptep, spte);
exit:
trace_fast_page_fault(vcpu, gva, error_code, iterator.sptep,
spte, ret);
--
1.8.1.4
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
