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Commit 9f811285 authored by Avi Kivity's avatar Avi Kivity
Browse files

KVM: Provide unlocked version of emulator_write_phys() 



Signed-off-by: default avatarAvi Kivity <avi@qumranet.com>
parent 0cf1bfd2

arch/x86/kvm/x86.c

+14 −7
Original line number Diff line number Diff line
@@ -1840,22 +1840,29 @@ static int emulator_read_emulated(unsigned long addr, 
	return X86EMUL_UNHANDLEABLE;

}



static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,

int __emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,

			  const void *val, int bytes)

{

	int ret;



	down_read(&vcpu->kvm->slots_lock);

	ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);

	if (ret < 0) {

		up_read(&vcpu->kvm->slots_lock);

	if (ret < 0)

		return 0;

	}

	kvm_mmu_pte_write(vcpu, gpa, val, bytes);

	up_read(&vcpu->kvm->slots_lock);

	return 1;

}



static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,

			const void *val, int bytes)

{

	int ret;



	down_read(&vcpu->kvm->slots_lock);

	ret =__emulator_write_phys(vcpu, gpa, val, bytes);

	up_read(&vcpu->kvm->slots_lock);

	return ret;

}



static int emulator_write_emulated_onepage(unsigned long addr,

					   const void *val,

					   unsigned int bytes,

include/asm-x86/kvm_host.h

+3 −0
Original line number Diff line number Diff line
@@ -432,6 +432,9 @@ void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages); 


int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);



int __emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,

			  const void *val, int bytes);



enum emulation_result {

	EMULATE_DONE,       /* no further processing */

	EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */