| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Thu, 26 Feb 2009 16:15:18 +0200
From: Avi Kivity <avi@...hat.com>
To: kvm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 28/40] KVM: MMU: Replace walk_shadow() by for_each_shadow_entry() in invlpg()
Signed-off-by: Avi Kivity <avi@...hat.com>
---
arch/x86/kvm/paging_tmpl.h | 81 +++++++++++++++++--------------------------
1 files changed, 32 insertions(+), 49 deletions(-)
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 69c7e33..46b68f9 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -25,7 +25,6 @@
#if PTTYPE == 64
#define pt_element_t u64
#define guest_walker guest_walker64
- #define shadow_walker shadow_walker64
#define FNAME(name) paging##64_##name
#define PT_BASE_ADDR_MASK PT64_BASE_ADDR_MASK
#define PT_DIR_BASE_ADDR_MASK PT64_DIR_BASE_ADDR_MASK
@@ -42,7 +41,6 @@
#elif PTTYPE == 32
#define pt_element_t u32
#define guest_walker guest_walker32
- #define shadow_walker shadow_walker32
#define FNAME(name) paging##32_##name
#define PT_BASE_ADDR_MASK PT32_BASE_ADDR_MASK
#define PT_DIR_BASE_ADDR_MASK PT32_DIR_BASE_ADDR_MASK
@@ -73,18 +71,6 @@ struct guest_walker {
u32 error_code;
};
-struct shadow_walker {
- struct kvm_shadow_walk walker;
- struct guest_walker *guest_walker;
- int user_fault;
- int write_fault;
- int largepage;
- int *ptwrite;
- pfn_t pfn;
- u64 *sptep;
- gpa_t pte_gpa;
-};
-
static gfn_t gpte_to_gfn(pt_element_t gpte)
{
return (gpte & PT_BASE_ADDR_MASK) >> PAGE_SHIFT;
@@ -453,54 +439,52 @@ out_unlock:
return 0;
}
-static int FNAME(shadow_invlpg_entry)(struct kvm_shadow_walk *_sw,
- struct kvm_vcpu *vcpu, u64 addr,
- u64 *sptep, int level)
+static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva)
{
- struct shadow_walker *sw =
- container_of(_sw, struct shadow_walker, walker);
+ struct kvm_shadow_walk_iterator iterator;
+ pt_element_t gpte;
+ gpa_t pte_gpa = -1;
+ int level;
+ u64 *sptep;
+
+ spin_lock(&vcpu->kvm->mmu_lock);
- /* FIXME: properly handle invlpg on large guest pages */
- if (level == PT_PAGE_TABLE_LEVEL ||
- ((level == PT_DIRECTORY_LEVEL) && is_large_pte(*sptep))) {
- struct kvm_mmu_page *sp = page_header(__pa(sptep));
+ for_each_shadow_entry(vcpu, gva, iterator) {
+ level = iterator.level;
+ sptep = iterator.sptep;
- sw->pte_gpa = (sp->gfn << PAGE_SHIFT);
- sw->pte_gpa += (sptep - sp->spt) * sizeof(pt_element_t);
+ /* FIXME: properly handle invlpg on large guest pages */
+ if (level == PT_PAGE_TABLE_LEVEL ||
+ ((level == PT_DIRECTORY_LEVEL) && is_large_pte(*sptep))) {
+ struct kvm_mmu_page *sp = page_header(__pa(sptep));
- if (is_shadow_present_pte(*sptep)) {
- rmap_remove(vcpu->kvm, sptep);
- if (is_large_pte(*sptep))
- --vcpu->kvm->stat.lpages;
+ pte_gpa = (sp->gfn << PAGE_SHIFT);
+ pte_gpa += (sptep - sp->spt) * sizeof(pt_element_t);
+
+ if (is_shadow_present_pte(*sptep)) {
+ rmap_remove(vcpu->kvm, sptep);
+ if (is_large_pte(*sptep))
+ --vcpu->kvm->stat.lpages;
+ }
+ set_shadow_pte(sptep, shadow_trap_nonpresent_pte);
+ break;
}
- set_shadow_pte(sptep, shadow_trap_nonpresent_pte);
- return 1;
- }
- if (!is_shadow_present_pte(*sptep))
- return 1;
- return 0;
-}
-static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva)
-{
- pt_element_t gpte;
- struct shadow_walker walker = {
- .walker = { .entry = FNAME(shadow_invlpg_entry), },
- .pte_gpa = -1,
- };
+ if (!is_shadow_present_pte(*sptep))
+ break;
+ }
- spin_lock(&vcpu->kvm->mmu_lock);
- walk_shadow(&walker.walker, vcpu, gva);
spin_unlock(&vcpu->kvm->mmu_lock);
- if (walker.pte_gpa == -1)
+
+ if (pte_gpa == -1)
return;
- if (kvm_read_guest_atomic(vcpu->kvm, walker.pte_gpa, &gpte,
+ if (kvm_read_guest_atomic(vcpu->kvm, pte_gpa, &gpte,
sizeof(pt_element_t)))
return;
if (is_present_pte(gpte) && (gpte & PT_ACCESSED_MASK)) {
if (mmu_topup_memory_caches(vcpu))
return;
- kvm_mmu_pte_write(vcpu, walker.pte_gpa, (const u8 *)&gpte,
+ kvm_mmu_pte_write(vcpu, pte_gpa, (const u8 *)&gpte,
sizeof(pt_element_t), 0);
}
}
@@ -607,7 +591,6 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
#undef pt_element_t
#undef guest_walker
-#undef shadow_walker
#undef FNAME
#undef PT_BASE_ADDR_MASK
#undef PT_INDEX
--
1.6.0.6
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists