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KVM: x86: merge handle_mmio_page_fault and handle_mmio_page_fault_common 

They are exactly the same, except that handle_mmio_page_fault
has an unused argument and a call to WARN_ON.  Remove the unused
argument from the callers, and move the warning to (the former)
handle_mmio_page_fault_common.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-11-04 13:41:21 +01:00
parent a3eaa8649e
commit 450869d6db
4 changed files with 10 additions and 21 deletions
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20
arch/x86/kvm/mmu.c
View File

@ -3359,7 +3359,7 @@ exit:
return reserved; return reserved;
} }
int handle_mmio_page_fault_common(struct kvm_vcpu *vcpu, u64 addr, bool direct) int handle_mmio_page_fault(struct kvm_vcpu *vcpu, u64 addr, bool direct)
{ {
u64 spte; u64 spte;
bool reserved; bool reserved;
@ -3368,7 +3368,7 @@ int handle_mmio_page_fault_common(struct kvm_vcpu *vcpu, u64 addr, bool direct)
return RET_MMIO_PF_EMULATE; return RET_MMIO_PF_EMULATE;
reserved = walk_shadow_page_get_mmio_spte(vcpu, addr, &spte); reserved = walk_shadow_page_get_mmio_spte(vcpu, addr, &spte);
if (unlikely(reserved)) if (WARN_ON(reserved))
return RET_MMIO_PF_BUG; return RET_MMIO_PF_BUG;
if (is_mmio_spte(spte)) { if (is_mmio_spte(spte)) {
@ -3392,17 +3392,7 @@ int handle_mmio_page_fault_common(struct kvm_vcpu *vcpu, u64 addr, bool direct)
*/ */
return RET_MMIO_PF_RETRY; return RET_MMIO_PF_RETRY;
} }
EXPORT_SYMBOL_GPL(handle_mmio_page_fault_common); EXPORT_SYMBOL_GPL(handle_mmio_page_fault);
static int handle_mmio_page_fault(struct kvm_vcpu *vcpu, u64 addr,
u32 error_code, bool direct)
{
int ret;
ret = handle_mmio_page_fault_common(vcpu, addr, direct);
WARN_ON(ret == RET_MMIO_PF_BUG);
return ret;
}
static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva, static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
u32 error_code, bool prefault) u32 error_code, bool prefault)
@ -3413,7 +3403,7 @@ static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
pgprintk("%s: gva %lx error %x\n", __func__, gva, error_code); pgprintk("%s: gva %lx error %x\n", __func__, gva, error_code);
if (unlikely(error_code & PFERR_RSVD_MASK)) { if (unlikely(error_code & PFERR_RSVD_MASK)) {
r = handle_mmio_page_fault(vcpu, gva, error_code, true); r = handle_mmio_page_fault(vcpu, gva, true);
if (likely(r != RET_MMIO_PF_INVALID)) if (likely(r != RET_MMIO_PF_INVALID))
return r; return r;
@ -3503,7 +3493,7 @@ static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa, u32 error_code,
MMU_WARN_ON(!VALID_PAGE(vcpu->arch.mmu.root_hpa)); MMU_WARN_ON(!VALID_PAGE(vcpu->arch.mmu.root_hpa));
if (unlikely(error_code & PFERR_RSVD_MASK)) { if (unlikely(error_code & PFERR_RSVD_MASK)) {
r = handle_mmio_page_fault(vcpu, gpa, error_code, true); r = handle_mmio_page_fault(vcpu, gpa, true);
if (likely(r != RET_MMIO_PF_INVALID)) if (likely(r != RET_MMIO_PF_INVALID))
return r; return r;

6
arch/x86/kvm/mmu.h
View File

@ -56,13 +56,13 @@ void
reset_shadow_zero_bits_mask(struct kvm_vcpu *vcpu, struct kvm_mmu *context); reset_shadow_zero_bits_mask(struct kvm_vcpu *vcpu, struct kvm_mmu *context);
/* /*
* Return values of handle_mmio_page_fault_common: * Return values of handle_mmio_page_fault:
* RET_MMIO_PF_EMULATE: it is a real mmio page fault, emulate the instruction * RET_MMIO_PF_EMULATE: it is a real mmio page fault, emulate the instruction
* directly. * directly.
* RET_MMIO_PF_INVALID: invalid spte is detected then let the real page * RET_MMIO_PF_INVALID: invalid spte is detected then let the real page
* fault path update the mmio spte. * fault path update the mmio spte.
* RET_MMIO_PF_RETRY: let CPU fault again on the address. * RET_MMIO_PF_RETRY: let CPU fault again on the address.
* RET_MMIO_PF_BUG: bug is detected. * RET_MMIO_PF_BUG: a bug was detected (and a WARN was printed).
*/ */
enum { enum {
RET_MMIO_PF_EMULATE = 1, RET_MMIO_PF_EMULATE = 1,
@ -71,7 +71,7 @@ enum {
RET_MMIO_PF_BUG = -1 RET_MMIO_PF_BUG = -1
}; };
int handle_mmio_page_fault_common(struct kvm_vcpu *vcpu, u64 addr, bool direct); int handle_mmio_page_fault(struct kvm_vcpu *vcpu, u64 addr, bool direct);
void kvm_init_shadow_mmu(struct kvm_vcpu *vcpu); void kvm_init_shadow_mmu(struct kvm_vcpu *vcpu);
void kvm_init_shadow_ept_mmu(struct kvm_vcpu *vcpu, bool execonly); void kvm_init_shadow_ept_mmu(struct kvm_vcpu *vcpu, bool execonly);

3
arch/x86/kvm/paging_tmpl.h
View File

@ -705,8 +705,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, u32 error_code,
pgprintk("%s: addr %lx err %x\n", __func__, addr, error_code); pgprintk("%s: addr %lx err %x\n", __func__, addr, error_code);
if (unlikely(error_code & PFERR_RSVD_MASK)) { if (unlikely(error_code & PFERR_RSVD_MASK)) {
r = handle_mmio_page_fault(vcpu, addr, error_code, r = handle_mmio_page_fault(vcpu, addr, mmu_is_nested(vcpu));
mmu_is_nested(vcpu));
if (likely(r != RET_MMIO_PF_INVALID)) if (likely(r != RET_MMIO_PF_INVALID))
return r; return r;

2
arch/x86/kvm/vmx.c
View File

@ -5908,7 +5908,7 @@ static int handle_ept_misconfig(struct kvm_vcpu *vcpu)
return 1; return 1;
} }
ret = handle_mmio_page_fault_common(vcpu, gpa, true); ret = handle_mmio_page_fault(vcpu, gpa, true);
if (likely(ret == RET_MMIO_PF_EMULATE)) if (likely(ret == RET_MMIO_PF_EMULATE))
return x86_emulate_instruction(vcpu, gpa, 0, NULL, 0) == return x86_emulate_instruction(vcpu, gpa, 0, NULL, 0) ==
EMULATE_DONE; EMULATE_DONE;