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-rw-r--r--arch/x86/kvm/mmu.c89
-rw-r--r--arch/x86/kvm/paging_tmpl.h26
-rw-r--r--include/asm-x86/kvm_host.h4
-rw-r--r--include/linux/kvm_host.h12
-rw-r--r--include/linux/kvm_types.h2
-rw-r--r--virt/kvm/kvm_main.c68
6 files changed, 133 insertions, 68 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index c89bf23..078a7f1 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -240,11 +240,9 @@ static int is_rmap_pte(u64 pte)
return is_shadow_present_pte(pte);
}
-static struct page *spte_to_page(u64 pte)
+static pfn_t spte_to_pfn(u64 pte)
{
- hfn_t hfn = (pte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT;
-
- return pfn_to_page(hfn);
+ return (pte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT;
}
static gfn_t pse36_gfn_delta(u32 gpte)
@@ -541,20 +539,20 @@ static void rmap_remove(struct kvm *kvm, u64 *spte)
struct kvm_rmap_desc *desc;
struct kvm_rmap_desc *prev_desc;
struct kvm_mmu_page *sp;
- struct page *page;
+ pfn_t pfn;
unsigned long *rmapp;
int i;
if (!is_rmap_pte(*spte))
return;
sp = page_header(__pa(spte));
- page = spte_to_page(*spte);
+ pfn = spte_to_pfn(*spte);
if (*spte & PT_ACCESSED_MASK)
- mark_page_accessed(page);
+ kvm_set_pfn_accessed(pfn);
if (is_writeble_pte(*spte))
- kvm_release_page_dirty(page);
+ kvm_release_pfn_dirty(pfn);
else
- kvm_release_page_clean(page);
+ kvm_release_pfn_clean(pfn);
rmapp = gfn_to_rmap(kvm, sp->gfns[spte - sp->spt], is_large_pte(*spte));
if (!*rmapp) {
printk(KERN_ERR "rmap_remove: %p %llx 0->BUG\n", spte, *spte);
@@ -635,11 +633,11 @@ static void rmap_write_protect(struct kvm *kvm, u64 gfn)
spte = rmap_next(kvm, rmapp, spte);
}
if (write_protected) {
- struct page *page;
+ pfn_t pfn;
spte = rmap_next(kvm, rmapp, NULL);
- page = spte_to_page(*spte);
- SetPageDirty(page);
+ pfn = spte_to_pfn(*spte);
+ kvm_set_pfn_dirty(pfn);
}
/* check for huge page mappings */
@@ -1036,7 +1034,7 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte,
unsigned pt_access, unsigned pte_access,
int user_fault, int write_fault, int dirty,
int *ptwrite, int largepage, gfn_t gfn,
- struct page *page, bool speculative)
+ pfn_t pfn, bool speculative)
{
u64 spte;
int was_rmapped = 0;
@@ -1058,10 +1056,9 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte,
child = page_header(pte & PT64_BASE_ADDR_MASK);
mmu_page_remove_parent_pte(child, shadow_pte);
- } else if (page != spte_to_page(*shadow_pte)) {
+ } else if (pfn != spte_to_pfn(*shadow_pte)) {
pgprintk("hfn old %lx new %lx\n",
- page_to_pfn(spte_to_page(*shadow_pte)),
- page_to_pfn(page));
+ spte_to_pfn(*shadow_pte), pfn);
rmap_remove(vcpu->kvm, shadow_pte);
} else {
if (largepage)
@@ -1090,7 +1087,7 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte,
if (largepage)
spte |= PT_PAGE_SIZE_MASK;
- spte |= page_to_phys(page);
+ spte |= (u64)pfn << PAGE_SHIFT;
if ((pte_access & ACC_WRITE_MASK)
|| (write_fault && !is_write_protection(vcpu) && !user_fault)) {
@@ -1135,12 +1132,12 @@ unshadowed:
if (!was_rmapped) {
rmap_add(vcpu, shadow_pte, gfn, largepage);
if (!is_rmap_pte(*shadow_pte))
- kvm_release_page_clean(page);
+ kvm_release_pfn_clean(pfn);
} else {
if (was_writeble)
- kvm_release_page_dirty(page);
+ kvm_release_pfn_dirty(pfn);
else
- kvm_release_page_clean(page);
+ kvm_release_pfn_clean(pfn);
}
if (!ptwrite || !*ptwrite)
vcpu->arch.last_pte_updated = shadow_pte;
@@ -1151,7 +1148,7 @@ static void nonpaging_new_cr3(struct kvm_vcpu *vcpu)
}
static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write,
- int largepage, gfn_t gfn, struct page *page,
+ int largepage, gfn_t gfn, pfn_t pfn,
int level)
{
hpa_t table_addr = vcpu->arch.mmu.root_hpa;
@@ -1166,13 +1163,13 @@ static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write,
if (level == 1) {
mmu_set_spte(vcpu, &table[index], ACC_ALL, ACC_ALL,
- 0, write, 1, &pt_write, 0, gfn, page, false);
+ 0, write, 1, &pt_write, 0, gfn, pfn, false);
return pt_write;
}
if (largepage && level == 2) {
mmu_set_spte(vcpu, &table[index], ACC_ALL, ACC_ALL,
- 0, write, 1, &pt_write, 1, gfn, page, false);
+ 0, write, 1, &pt_write, 1, gfn, pfn, false);
return pt_write;
}
@@ -1187,7 +1184,7 @@ static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write,
1, ACC_ALL, &table[index]);
if (!new_table) {
pgprintk("nonpaging_map: ENOMEM\n");
- kvm_release_page_clean(page);
+ kvm_release_pfn_clean(pfn);
return -ENOMEM;
}
@@ -1202,8 +1199,7 @@ static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write, gfn_t gfn)
{
int r;
int largepage = 0;
-
- struct page *page;
+ pfn_t pfn;
down_read(&current->mm->mmap_sem);
if (is_largepage_backed(vcpu, gfn & ~(KVM_PAGES_PER_HPAGE-1))) {
@@ -1211,18 +1207,18 @@ static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write, gfn_t gfn)
largepage = 1;
}
- page = gfn_to_page(vcpu->kvm, gfn);
+ pfn = gfn_to_pfn(vcpu->kvm, gfn);
up_read(&current->mm->mmap_sem);
/* mmio */
- if (is_error_page(page)) {
- kvm_release_page_clean(page);
+ if (is_error_pfn(pfn)) {
+ kvm_release_pfn_clean(pfn);
return 1;
}
spin_lock(&vcpu->kvm->mmu_lock);
kvm_mmu_free_some_pages(vcpu);
- r = __direct_map(vcpu, v, write, largepage, gfn, page,
+ r = __direct_map(vcpu, v, write, largepage, gfn, pfn,
PT32E_ROOT_LEVEL);
spin_unlock(&vcpu->kvm->mmu_lock);
@@ -1355,7 +1351,7 @@ static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa,
u32 error_code)
{
- struct page *page;
+ pfn_t pfn;
int r;
int largepage = 0;
gfn_t gfn = gpa >> PAGE_SHIFT;
@@ -1372,16 +1368,16 @@ static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa,
gfn &= ~(KVM_PAGES_PER_HPAGE-1);
largepage = 1;
}
- page = gfn_to_page(vcpu->kvm, gfn);
+ pfn = gfn_to_pfn(vcpu->kvm, gfn);
up_read(&current->mm->mmap_sem);
- if (is_error_page(page)) {
- kvm_release_page_clean(page);
+ if (is_error_pfn(pfn)) {
+ kvm_release_pfn_clean(pfn);
return 1;
}
spin_lock(&vcpu->kvm->mmu_lock);
kvm_mmu_free_some_pages(vcpu);
r = __direct_map(vcpu, gpa, error_code & PFERR_WRITE_MASK,
- largepage, gfn, page, TDP_ROOT_LEVEL);
+ largepage, gfn, pfn, TDP_ROOT_LEVEL);
spin_unlock(&vcpu->kvm->mmu_lock);
return r;
@@ -1525,6 +1521,8 @@ static int init_kvm_softmmu(struct kvm_vcpu *vcpu)
static int init_kvm_mmu(struct kvm_vcpu *vcpu)
{
+ vcpu->arch.update_pte.pfn = bad_pfn;
+
if (tdp_enabled)
return init_kvm_tdp_mmu(vcpu);
else
@@ -1644,7 +1642,7 @@ static void mmu_guess_page_from_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
gfn_t gfn;
int r;
u64 gpte = 0;
- struct page *page;
+ pfn_t pfn;
vcpu->arch.update_pte.largepage = 0;
@@ -1680,15 +1678,15 @@ static void mmu_guess_page_from_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
gfn &= ~(KVM_PAGES_PER_HPAGE-1);
vcpu->arch.update_pte.largepage = 1;
}
- page = gfn_to_page(vcpu->kvm, gfn);
+ pfn = gfn_to_pfn(vcpu->kvm, gfn);
up_read(&current->mm->mmap_sem);
- if (is_error_page(page)) {
- kvm_release_page_clean(page);
+ if (is_error_pfn(pfn)) {
+ kvm_release_pfn_clean(pfn);
return;
}
vcpu->arch.update_pte.gfn = gfn;
- vcpu->arch.update_pte.page = page;
+ vcpu->arch.update_pte.pfn = pfn;
}
void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
@@ -1793,9 +1791,9 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
}
kvm_mmu_audit(vcpu, "post pte write");
spin_unlock(&vcpu->kvm->mmu_lock);
- if (vcpu->arch.update_pte.page) {
- kvm_release_page_clean(vcpu->arch.update_pte.page);
- vcpu->arch.update_pte.page = NULL;
+ if (!is_error_pfn(vcpu->arch.update_pte.pfn)) {
+ kvm_release_pfn_clean(vcpu->arch.update_pte.pfn);
+ vcpu->arch.update_pte.pfn = bad_pfn;
}
}
@@ -2236,8 +2234,7 @@ static void audit_mappings_page(struct kvm_vcpu *vcpu, u64 page_pte,
audit_mappings_page(vcpu, ent, va, level - 1);
} else {
gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, va);
- struct page *page = gpa_to_page(vcpu, gpa);
- hpa_t hpa = page_to_phys(page);
+ hpa_t hpa = (hpa_t)gpa_to_pfn(vcpu, gpa) << PAGE_SHIFT;
if (is_shadow_present_pte(ent)
&& (ent & PT64_BASE_ADDR_MASK) != hpa)
@@ -2250,7 +2247,7 @@ static void audit_mappings_page(struct kvm_vcpu *vcpu, u64 page_pte,
&& !is_error_hpa(hpa))
printk(KERN_ERR "audit: (%s) notrap shadow,"
" valid guest gva %lx\n", audit_msg, va);
- kvm_release_page_clean(page);
+ kvm_release_pfn_clean(pfn);
}
}
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 57d872a..156fe10 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -247,7 +247,7 @@ static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *page,
{
pt_element_t gpte;
unsigned pte_access;
- struct page *npage;
+ pfn_t pfn;
int largepage = vcpu->arch.update_pte.largepage;
gpte = *(const pt_element_t *)pte;
@@ -260,13 +260,13 @@ static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *page,
pte_access = page->role.access & FNAME(gpte_access)(vcpu, gpte);
if (gpte_to_gfn(gpte) != vcpu->arch.update_pte.gfn)
return;
- npage = vcpu->arch.update_pte.page;
- if (!npage)
+ pfn = vcpu->arch.update_pte.pfn;
+ if (is_error_pfn(pfn))
return;
- get_page(npage);
+ kvm_get_pfn(pfn);
mmu_set_spte(vcpu, spte, page->role.access, pte_access, 0, 0,
gpte & PT_DIRTY_MASK, NULL, largepage, gpte_to_gfn(gpte),
- npage, true);
+ pfn, true);
}
/*
@@ -275,7 +275,7 @@ static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *page,
static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
struct guest_walker *walker,
int user_fault, int write_fault, int largepage,
- int *ptwrite, struct page *page)
+ int *ptwrite, pfn_t pfn)
{
hpa_t shadow_addr;
int level;
@@ -336,7 +336,7 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
walker->pte_gpa[level - 2],
&curr_pte, sizeof(curr_pte));
if (r || curr_pte != walker->ptes[level - 2]) {
- kvm_release_page_clean(page);
+ kvm_release_pfn_clean(pfn);
return NULL;
}
}
@@ -349,7 +349,7 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
mmu_set_spte(vcpu, shadow_ent, access, walker->pte_access & access,
user_fault, write_fault,
walker->ptes[walker->level-1] & PT_DIRTY_MASK,
- ptwrite, largepage, walker->gfn, page, false);
+ ptwrite, largepage, walker->gfn, pfn, false);
return shadow_ent;
}
@@ -378,7 +378,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
u64 *shadow_pte;
int write_pt = 0;
int r;
- struct page *page;
+ pfn_t pfn;
int largepage = 0;
pgprintk("%s: addr %lx err %x\n", __func__, addr, error_code);
@@ -413,20 +413,20 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
largepage = 1;
}
}
- page = gfn_to_page(vcpu->kvm, walker.gfn);
+ pfn = gfn_to_pfn(vcpu->kvm, walker.gfn);
up_read(&current->mm->mmap_sem);
/* mmio */
- if (is_error_page(page)) {
+ if (is_error_pfn(pfn)) {
pgprintk("gfn %x is mmio\n", walker.gfn);
- kvm_release_page_clean(page);
+ kvm_release_pfn_clean(pfn);
return 1;
}
spin_lock(&vcpu->kvm->mmu_lock);
kvm_mmu_free_some_pages(vcpu);
shadow_pte = FNAME(fetch)(vcpu, addr, &walker, user_fault, write_fault,
- largepage, &write_pt, page);
+ largepage, &write_pt, pfn);
pgprintk("%s: shadow pte %p %llx ptwrite %d\n", __func__,
shadow_pte, *shadow_pte, write_pt);
diff --git a/include/asm-x86/kvm_host.h b/include/asm-x86/kvm_host.h
index b923049..de3eccf 100644
--- a/include/asm-x86/kvm_host.h
+++ b/include/asm-x86/kvm_host.h
@@ -248,8 +248,8 @@ struct kvm_vcpu_arch {
u64 *last_pte_updated;
struct {
- gfn_t gfn; /* presumed gfn during guest pte update */
- struct page *page; /* page corresponding to that gfn */
+ gfn_t gfn; /* presumed gfn during guest pte update */
+ pfn_t pfn; /* pfn corresponding to that gfn */
int largepage;
} update_pte;
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index a2ceb51..578c363 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -150,8 +150,10 @@ static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva);
extern struct page *bad_page;
+extern pfn_t bad_pfn;
int is_error_page(struct page *page);
+int is_error_pfn(pfn_t pfn);
int kvm_is_error_hva(unsigned long addr);
int kvm_set_memory_region(struct kvm *kvm,
struct kvm_userspace_memory_region *mem,
@@ -168,6 +170,16 @@ struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
void kvm_release_page_clean(struct page *page);
void kvm_release_page_dirty(struct page *page);
+void kvm_set_page_dirty(struct page *page);
+void kvm_set_page_accessed(struct page *page);
+
+pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn);
+void kvm_release_pfn_dirty(pfn_t);
+void kvm_release_pfn_clean(pfn_t pfn);
+void kvm_set_pfn_dirty(pfn_t pfn);
+void kvm_set_pfn_accessed(pfn_t pfn);
+void kvm_get_pfn(pfn_t pfn);
+
int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
int len);
int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
index 1c4e46d..9b6f395 100644
--- a/include/linux/kvm_types.h
+++ b/include/linux/kvm_types.h
@@ -38,6 +38,8 @@ typedef unsigned long hva_t;
typedef u64 hpa_t;
typedef unsigned long hfn_t;
+typedef hfn_t pfn_t;
+
struct kvm_pio_request {
unsigned long count;
int cur_count;
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 93ed78b..6a52c08 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -40,6 +40,7 @@
#include <linux/kvm_para.h>
#include <linux/pagemap.h>
#include <linux/mman.h>
+#include <linux/swap.h>
#include <asm/processor.h>
#include <asm/io.h>
@@ -458,6 +459,12 @@ int is_error_page(struct page *page)
}
EXPORT_SYMBOL_GPL(is_error_page);
+int is_error_pfn(pfn_t pfn)
+{
+ return pfn == bad_pfn;
+}
+EXPORT_SYMBOL_GPL(is_error_pfn);
+
static inline unsigned long bad_hva(void)
{
return PAGE_OFFSET;
@@ -519,7 +526,7 @@ unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
/*
* Requires current->mm->mmap_sem to be held
*/
-struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
+pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
{
struct page *page[1];
unsigned long addr;
@@ -530,7 +537,7 @@ struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
addr = gfn_to_hva(kvm, gfn);
if (kvm_is_error_hva(addr)) {
get_page(bad_page);
- return bad_page;
+ return page_to_pfn(bad_page);
}
npages = get_user_pages(current, current->mm, addr, 1, 1, 1, page,
@@ -538,27 +545,71 @@ struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
if (npages != 1) {
get_page(bad_page);
- return bad_page;
+ return page_to_pfn(bad_page);
}
- return page[0];
+ return page_to_pfn(page[0]);
+}
+
+EXPORT_SYMBOL_GPL(gfn_to_pfn);
+
+struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
+{
+ return pfn_to_page(gfn_to_pfn(kvm, gfn));
}
EXPORT_SYMBOL_GPL(gfn_to_page);
void kvm_release_page_clean(struct page *page)
{
- put_page(page);
+ kvm_release_pfn_clean(page_to_pfn(page));
}
EXPORT_SYMBOL_GPL(kvm_release_page_clean);
+void kvm_release_pfn_clean(pfn_t pfn)
+{
+ put_page(pfn_to_page(pfn));
+}
+EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
+
void kvm_release_page_dirty(struct page *page)
{
+ kvm_release_pfn_dirty(page_to_pfn(page));
+}
+EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
+
+void kvm_release_pfn_dirty(pfn_t pfn)
+{
+ kvm_set_pfn_dirty(pfn);
+ kvm_release_pfn_clean(pfn);
+}
+EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
+
+void kvm_set_page_dirty(struct page *page)
+{
+ kvm_set_pfn_dirty(page_to_pfn(page));
+}
+EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
+
+void kvm_set_pfn_dirty(pfn_t pfn)
+{
+ struct page *page = pfn_to_page(pfn);
if (!PageReserved(page))
SetPageDirty(page);
- put_page(page);
}
-EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
+EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
+
+void kvm_set_pfn_accessed(pfn_t pfn)
+{
+ mark_page_accessed(pfn_to_page(pfn));
+}
+EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
+
+void kvm_get_pfn(pfn_t pfn)
+{
+ get_page(pfn_to_page(pfn));
+}
+EXPORT_SYMBOL_GPL(kvm_get_pfn);
static int next_segment(unsigned long len, int offset)
{
@@ -1351,6 +1402,7 @@ static struct sys_device kvm_sysdev = {
};
struct page *bad_page;
+pfn_t bad_pfn;
static inline
struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
@@ -1392,6 +1444,8 @@ int kvm_init(void *opaque, unsigned int vcpu_size,
goto out;
}
+ bad_pfn = page_to_pfn(bad_page);
+
r = kvm_arch_hardware_setup();
if (r < 0)
goto out_free_0;
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