[PATCH 09/11] KVM: x86: use vcpu-specific functions to read/write/translate GFNs

From: Paolo Bonzini
Date: Mon May 18 2015 - 09:51:11 EST

We need to hide SMRAM from guests not running in SMM. Therefore,
all uses of kvm_read_guest* and kvm_write_guest* must be changed to
check whether the VCPU is in system management mode and use a
different set of memslots. Switch from kvm_* to the newly-introduced
kvm_vcpu_*, which call into kvm_arch_vcpu_memslots.

For now, the code is just copied from virt/kvm/kvm_main.c, except
for calls to other read/write functions.

Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
arch/x86/include/asm/kvm_host.h | 2 +-
arch/x86/kvm/mmu.c | 36 ++++++++++++++++++------------------
arch/x86/kvm/paging_tmpl.h | 14 +++++++-------
arch/x86/kvm/svm.c | 10 +++++-----
arch/x86/kvm/vmx.c | 22 +++++++++++-----------
arch/x86/kvm/x86.c | 26 +++++++++++++-------------
6 files changed, 55 insertions(+), 55 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index b872bad8855e..71232ccc8fe4 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -885,7 +885,7 @@ void kvm_mmu_clear_dirty_pt_masked(struct kvm *kvm,
struct kvm_memory_slot *slot,
gfn_t gfn_offset, unsigned long mask);
void kvm_mmu_zap_all(struct kvm *kvm);
-void kvm_mmu_invalidate_mmio_sptes(struct kvm *kvm);
+void kvm_mmu_invalidate_mmio_sptes(struct kvm *kvm, struct kvm_memslots *slots);
unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm);
void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages);

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 817ae3ece05c..7eff9d249f39 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -223,15 +223,15 @@ static unsigned int get_mmio_spte_generation(u64 spte)
return gen;
}

-static unsigned int kvm_current_mmio_generation(struct kvm *kvm)
+static unsigned int kvm_current_mmio_generation(struct kvm_vcpu *vcpu)
{
- return kvm_memslots(kvm)->generation & MMIO_GEN_MASK;
+ return kvm_vcpu_memslots(vcpu)->generation & MMIO_GEN_MASK;
}

-static void mark_mmio_spte(struct kvm *kvm, u64 *sptep, u64 gfn,
+static void mark_mmio_spte(struct kvm_vcpu *vcpu, u64 *sptep, u64 gfn,
unsigned access)
{
- unsigned int gen = kvm_current_mmio_generation(kvm);
+ unsigned int gen = kvm_current_mmio_generation(vcpu);
u64 mask = generation_mmio_spte_mask(gen);

access &= ACC_WRITE_MASK | ACC_USER_MASK;
@@ -258,22 +258,22 @@ static unsigned get_mmio_spte_access(u64 spte)
return (spte & ~mask) & ~PAGE_MASK;
}

-static bool set_mmio_spte(struct kvm *kvm, u64 *sptep, gfn_t gfn,
+static bool set_mmio_spte(struct kvm_vcpu *vcpu, u64 *sptep, gfn_t gfn,
pfn_t pfn, unsigned access)
{
if (unlikely(is_noslot_pfn(pfn))) {
- mark_mmio_spte(kvm, sptep, gfn, access);
+ mark_mmio_spte(vcpu, sptep, gfn, access);
return true;
}

return false;
}

-static bool check_mmio_spte(struct kvm *kvm, u64 spte)
+static bool check_mmio_spte(struct kvm_vcpu *vcpu, u64 spte)
{
unsigned int kvm_gen, spte_gen;

- kvm_gen = kvm_current_mmio_generation(kvm);
+ kvm_gen = kvm_current_mmio_generation(vcpu);
spte_gen = get_mmio_spte_generation(spte);

trace_check_mmio_spte(spte, kvm_gen, spte_gen);
@@ -872,7 +872,7 @@ gfn_to_memslot_dirty_bitmap(struct kvm_vcpu *vcpu, gfn_t gfn,
{
struct kvm_memory_slot *slot;

- slot = gfn_to_memslot(vcpu->kvm, gfn);
+ slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
if (!slot || slot->flags & KVM_MEMSLOT_INVALID ||
(no_dirty_log && slot->dirty_bitmap))
slot = NULL;
@@ -2577,7 +2577,7 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
u64 spte;
int ret = 0;

- if (set_mmio_spte(vcpu->kvm, sptep, gfn, pfn, pte_access))
+ if (set_mmio_spte(vcpu, sptep, gfn, pfn, pte_access))
return 0;

spte = PT_PRESENT_MASK;
@@ -3424,7 +3424,7 @@ int handle_mmio_page_fault_common(struct kvm_vcpu *vcpu, u64 addr, bool direct)
gfn_t gfn = get_mmio_spte_gfn(spte);
unsigned access = get_mmio_spte_access(spte);

- if (!check_mmio_spte(vcpu->kvm, spte))
+ if (!check_mmio_spte(vcpu, spte))
return RET_MMIO_PF_INVALID;

if (direct)
@@ -3496,7 +3496,7 @@ static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn)
arch.direct_map = vcpu->arch.mmu.direct_map;
arch.cr3 = vcpu->arch.mmu.get_cr3(vcpu);

- return kvm_setup_async_pf(vcpu, gva, gfn_to_hva(vcpu->kvm, gfn), &arch);
+ return kvm_setup_async_pf(vcpu, gva, kvm_vcpu_gfn_to_hva(vcpu, gfn), &arch);
}

static bool can_do_async_pf(struct kvm_vcpu *vcpu)
@@ -3514,7 +3514,7 @@ static bool try_async_pf(struct kvm_vcpu *vcpu, bool prefault, gfn_t gfn,
struct kvm_memory_slot *slot;
bool async;

- slot = gfn_to_memslot(vcpu->kvm, gfn);
+ slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
async = false;
*pfn = __gfn_to_pfn_memslot(slot, gfn, false, &async, write, writable);
if (!async)
@@ -3627,7 +3627,7 @@ static void inject_page_fault(struct kvm_vcpu *vcpu,
vcpu->arch.mmu.inject_page_fault(vcpu, fault);
}

-static bool sync_mmio_spte(struct kvm *kvm, u64 *sptep, gfn_t gfn,
+static bool sync_mmio_spte(struct kvm_vcpu *vcpu, u64 *sptep, gfn_t gfn,
unsigned access, int *nr_present)
{
if (unlikely(is_mmio_spte(*sptep))) {
@@ -3637,7 +3637,7 @@ static bool sync_mmio_spte(struct kvm *kvm, u64 *sptep, gfn_t gfn,
}

(*nr_present)++;
- mark_mmio_spte(kvm, sptep, gfn, access);
+ mark_mmio_spte(vcpu, sptep, gfn, access);
return true;
}

@@ -4147,7 +4147,7 @@ static u64 mmu_pte_write_fetch_gpte(struct kvm_vcpu *vcpu, gpa_t *gpa,
/* Handle a 32-bit guest writing two halves of a 64-bit gpte */
*gpa &= ~(gpa_t)7;
*bytes = 8;
- r = kvm_read_guest(vcpu->kvm, *gpa, &gentry, 8);
+ r = kvm_vcpu_read_guest(vcpu, *gpa, &gentry, 8);
if (r)
gentry = 0;
new = (const u8 *)&gentry;
@@ -4773,13 +4773,13 @@ static bool kvm_has_zapped_obsolete_pages(struct kvm *kvm)
return unlikely(!list_empty_careful(&kvm->arch.zapped_obsolete_pages));
}

-void kvm_mmu_invalidate_mmio_sptes(struct kvm *kvm)
+void kvm_mmu_invalidate_mmio_sptes(struct kvm *kvm, struct kvm_memslots *slots)
{
/*
* The very rare case: if the generation-number is round,
* zap all shadow pages.
*/
- if (unlikely(kvm_current_mmio_generation(kvm) == 0)) {
+ if (unlikely((slots->generation & MMIO_GEN_MASK) == 0)) {
printk_ratelimited(KERN_DEBUG "kvm: zapping shadow pages for mmio generation wraparound\n");
kvm_mmu_invalidate_zap_all_pages(kvm);
}
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 6e6d115fe9b5..8a6c582db4b1 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -511,11 +511,11 @@ static bool FNAME(gpte_changed)(struct kvm_vcpu *vcpu,
base_gpa = pte_gpa & ~mask;
index = (pte_gpa - base_gpa) / sizeof(pt_element_t);

- r = kvm_read_guest_atomic(vcpu->kvm, base_gpa,
+ r = kvm_vcpu_read_guest_atomic(vcpu, base_gpa,
gw->prefetch_ptes, sizeof(gw->prefetch_ptes));
curr_pte = gw->prefetch_ptes[index];
} else
- r = kvm_read_guest_atomic(vcpu->kvm, pte_gpa,
+ r = kvm_vcpu_read_guest_atomic(vcpu, pte_gpa,
&curr_pte, sizeof(curr_pte));

return r || curr_pte != gw->ptes[level - 1];
@@ -869,8 +869,8 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva)
if (!rmap_can_add(vcpu))
break;

- if (kvm_read_guest_atomic(vcpu->kvm, pte_gpa, &gpte,
- sizeof(pt_element_t)))
+ if (kvm_vcpu_read_guest_atomic(vcpu, pte_gpa, &gpte,
+ sizeof(pt_element_t)))
break;

FNAME(update_pte)(vcpu, sp, sptep, &gpte);
@@ -956,8 +956,8 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)

pte_gpa = first_pte_gpa + i * sizeof(pt_element_t);

- if (kvm_read_guest_atomic(vcpu->kvm, pte_gpa, &gpte,
- sizeof(pt_element_t)))
+ if (kvm_vcpu_read_guest_atomic(vcpu, pte_gpa, &gpte,
+ sizeof(pt_element_t)))
return -EINVAL;

if (FNAME(prefetch_invalid_gpte)(vcpu, sp, &sp->spt[i], gpte)) {
@@ -970,7 +970,7 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
pte_access &= FNAME(gpte_access)(vcpu, gpte);
FNAME(protect_clean_gpte)(&pte_access, gpte);

- if (sync_mmio_spte(vcpu->kvm, &sp->spt[i], gfn, pte_access,
+ if (sync_mmio_spte(vcpu, &sp->spt[i], gfn, pte_access,
&nr_present))
continue;

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 6afffb82513c..ce22872cfad6 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1955,8 +1955,8 @@ static u64 nested_svm_get_tdp_pdptr(struct kvm_vcpu *vcpu, int index)
u64 pdpte;
int ret;

- ret = kvm_read_guest_page(vcpu->kvm, gpa_to_gfn(cr3), &pdpte,
- offset_in_page(cr3) + index * 8, 8);
+ ret = kvm_vcpu_read_guest_page(vcpu, gpa_to_gfn(cr3), &pdpte,
+ offset_in_page(cr3) + index * 8, 8);
if (ret)
return 0;
return pdpte;
@@ -2153,7 +2153,7 @@ static int nested_svm_intercept_ioio(struct vcpu_svm *svm)
mask = (0xf >> (4 - size)) << start_bit;
val = 0;

- if (kvm_read_guest(svm->vcpu.kvm, gpa, &val, iopm_len))
+ if (kvm_vcpu_read_guest(&svm->vcpu, gpa, &val, iopm_len))
return NESTED_EXIT_DONE;

return (val & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
@@ -2178,7 +2178,7 @@ static int nested_svm_exit_handled_msr(struct vcpu_svm *svm)
/* Offset is in 32 bit units but need in 8 bit units */
offset *= 4;

- if (kvm_read_guest(svm->vcpu.kvm, svm->nested.vmcb_msrpm + offset, &value, 4))
+ if (kvm_vcpu_read_guest(&svm->vcpu, svm->nested.vmcb_msrpm + offset, &value, 4))
return NESTED_EXIT_DONE;

return (value & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
@@ -2449,7 +2449,7 @@ static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)
p = msrpm_offsets[i];
offset = svm->nested.vmcb_msrpm + (p * 4);

- if (kvm_read_guest(svm->vcpu.kvm, offset, &value, 4))
+ if (kvm_vcpu_read_guest(&svm->vcpu, offset, &value, 4))
return false;

svm->nested.msrpm[p] = svm->msrpm[p] | value;
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 9904aed78c72..c9eab7440c73 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -7323,7 +7323,7 @@ static bool nested_vmx_exit_handled_io(struct kvm_vcpu *vcpu,
bitmap += (port & 0x7fff) / 8;

if (last_bitmap != bitmap)
- if (kvm_read_guest(vcpu->kvm, bitmap, &b, 1))
+ if (kvm_vcpu_read_guest(vcpu, bitmap, &b, 1))
return true;
if (b & (1 << (port & 7)))
return true;
@@ -7367,7 +7367,7 @@ static bool nested_vmx_exit_handled_msr(struct kvm_vcpu *vcpu,
/* Then read the msr_index'th bit from this bitmap: */
if (msr_index < 1024*8) {
unsigned char b;
- if (kvm_read_guest(vcpu->kvm, bitmap + msr_index/8, &b, 1))
+ if (kvm_vcpu_read_guest(vcpu, bitmap + msr_index/8, &b, 1))
return true;
return 1 & (b >> (msr_index & 7));
} else
@@ -9109,8 +9109,8 @@ static u32 nested_vmx_load_msr(struct kvm_vcpu *vcpu, u64 gpa, u32 count)

msr.host_initiated = false;
for (i = 0; i < count; i++) {
- if (kvm_read_guest(vcpu->kvm, gpa + i * sizeof(e),
- &e, sizeof(e))) {
+ if (kvm_vcpu_read_guest(vcpu, gpa + i * sizeof(e),
+ &e, sizeof(e))) {
pr_warn_ratelimited(
"%s cannot read MSR entry (%u, 0x%08llx)\n",
__func__, i, gpa + i * sizeof(e));
@@ -9143,9 +9143,9 @@ static int nested_vmx_store_msr(struct kvm_vcpu *vcpu, u64 gpa, u32 count)

for (i = 0; i < count; i++) {
struct msr_data msr_info;
- if (kvm_read_guest(vcpu->kvm,
- gpa + i * sizeof(e),
- &e, 2 * sizeof(u32))) {
+ if (kvm_vcpu_read_guest(vcpu,
+ gpa + i * sizeof(e),
+ &e, 2 * sizeof(u32))) {
pr_warn_ratelimited(
"%s cannot read MSR entry (%u, 0x%08llx)\n",
__func__, i, gpa + i * sizeof(e));
@@ -9165,10 +9165,10 @@ static int nested_vmx_store_msr(struct kvm_vcpu *vcpu, u64 gpa, u32 count)
__func__, i, e.index);
return -EINVAL;
}
- if (kvm_write_guest(vcpu->kvm,
- gpa + i * sizeof(e) +
- offsetof(struct vmx_msr_entry, value),
- &msr_info.data, sizeof(msr_info.data))) {
+ if (kvm_vcpu_write_guest(vcpu,
+ gpa + i * sizeof(e) +
+ offsetof(struct vmx_msr_entry, value),
+ &msr_info.data, sizeof(msr_info.data))) {
pr_warn_ratelimited(
"%s cannot write MSR (%u, 0x%x, 0x%llx)\n",
__func__, i, e.index, msr_info.data);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 753cf20c0ec5..0b6192fc348a 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -475,7 +475,7 @@ EXPORT_SYMBOL_GPL(kvm_require_dr);

/*
* This function will be used to read from the physical memory of the currently
- * running guest. The difference to kvm_read_guest_page is that this function
+ * running guest. The difference to kvm_vcpu_read_guest_page is that this function
* can read from guest physical or from the guest's guest physical memory.
*/
int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
@@ -493,7 +493,7 @@ int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,

real_gfn = gpa_to_gfn(real_gfn);

- return kvm_read_guest_page(vcpu->kvm, real_gfn, data, offset, len);
+ return kvm_vcpu_read_guest_page(vcpu, real_gfn, data, offset, len);
}
EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu);

@@ -2022,7 +2022,7 @@ static int xen_hvm_config(struct kvm_vcpu *vcpu, u64 data)
r = PTR_ERR(page);
goto out;
}
- if (kvm_write_guest(kvm, page_addr, page, PAGE_SIZE))
+ if (kvm_vcpu_write_guest(vcpu, page_addr, page, PAGE_SIZE))
goto out_free;
r = 0;
out_free:
@@ -2122,7 +2122,7 @@ static int set_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 data)
break;
}
gfn = data >> HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT;
- addr = gfn_to_hva(vcpu->kvm, gfn);
+ addr = kvm_vcpu_gfn_to_hva(vcpu, gfn);
if (kvm_is_error_hva(addr))
return 1;
if (__clear_user((void __user *)addr, PAGE_SIZE))
@@ -4409,8 +4409,8 @@ static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,

if (gpa == UNMAPPED_GVA)
return X86EMUL_PROPAGATE_FAULT;
- ret = kvm_read_guest_page(vcpu->kvm, gpa >> PAGE_SHIFT, data,
- offset, toread);
+ ret = kvm_vcpu_read_guest_page(vcpu, gpa >> PAGE_SHIFT, data,
+ offset, toread);
if (ret < 0) {
r = X86EMUL_IO_NEEDED;
goto out;
@@ -4443,8 +4443,8 @@ static int kvm_fetch_guest_virt(struct x86_emulate_ctxt *ctxt,
offset = addr & (PAGE_SIZE-1);
if (WARN_ON(offset + bytes > PAGE_SIZE))
bytes = (unsigned)PAGE_SIZE - offset;
- ret = kvm_read_guest_page(vcpu->kvm, gpa >> PAGE_SHIFT, val,
- offset, bytes);
+ ret = kvm_vcpu_read_guest_page(vcpu, gpa >> PAGE_SHIFT, val,
+ offset, bytes);
if (unlikely(ret < 0))
return X86EMUL_IO_NEEDED;

@@ -4490,7 +4490,7 @@ int kvm_write_guest_virt_system(struct x86_emulate_ctxt *ctxt,

if (gpa == UNMAPPED_GVA)
return X86EMUL_PROPAGATE_FAULT;
- ret = kvm_write_guest(vcpu->kvm, gpa, data, towrite);
+ ret = kvm_vcpu_write_guest(vcpu, gpa, data, towrite);
if (ret < 0) {
r = X86EMUL_IO_NEEDED;
goto out;
@@ -4543,7 +4543,7 @@ int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
{
int ret;

- ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
+ ret = kvm_vcpu_write_guest(vcpu, gpa, val, bytes);
if (ret < 0)
return 0;
kvm_mmu_pte_write(vcpu, gpa, val, bytes);
@@ -4577,7 +4577,7 @@ static int read_prepare(struct kvm_vcpu *vcpu, void *val, int bytes)
static int read_emulate(struct kvm_vcpu *vcpu, gpa_t gpa,
void *val, int bytes)
{
- return !kvm_read_guest(vcpu->kvm, gpa, val, bytes);
+ return !kvm_vcpu_read_guest(vcpu, gpa, val, bytes);
}

static int write_emulate(struct kvm_vcpu *vcpu, gpa_t gpa,
@@ -6544,7 +6544,7 @@ static void process_smi(struct kvm_vcpu *vcpu)
else
process_smi_save_state_32(vcpu, buf);

- r = kvm_write_guest(vcpu->kvm, vcpu->arch.smbase + 0xfe00, buf, sizeof(buf));
+ r = kvm_vcpu_write_guest(vcpu, vcpu->arch.smbase + 0xfe00, buf, sizeof(buf));
if (r < 0)
return;

@@ -8034,7 +8034,7 @@ void kvm_arch_memslots_updated(struct kvm *kvm, struct kvm_memslots *slots)
* memslots->generation has been incremented.
* mmio generation may have reached its maximum value.
*/
- kvm_mmu_invalidate_mmio_sptes(kvm);
+ kvm_mmu_invalidate_mmio_sptes(kvm, slots);
}

int kvm_arch_prepare_memory_region(struct kvm *kvm,
--
1.8.3.1


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/