diff options
Diffstat (limited to 'drivers/kvm/kvm_main.c')
| -rw-r--r-- | drivers/kvm/kvm_main.c | 156 |
1 files changed, 46 insertions, 110 deletions
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index c0f372f..1c662f6 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -39,6 +39,7 @@ #include <linux/smp.h> #include <linux/anon_inodes.h> #include <linux/profile.h> +#include <linux/kvm_para.h> #include <asm/processor.h> #include <asm/msr.h> @@ -1362,51 +1363,61 @@ int kvm_emulate_halt(struct kvm_vcpu *vcpu) } EXPORT_SYMBOL_GPL(kvm_emulate_halt); -int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run) +int kvm_emulate_hypercall(struct kvm_vcpu *vcpu) { - unsigned long nr, a0, a1, a2, a3, a4, a5, ret; + unsigned long nr, a0, a1, a2, a3, ret; kvm_x86_ops->cache_regs(vcpu); - ret = -KVM_EINVAL; -#ifdef CONFIG_X86_64 - if (is_long_mode(vcpu)) { - nr = vcpu->regs[VCPU_REGS_RAX]; - a0 = vcpu->regs[VCPU_REGS_RDI]; - a1 = vcpu->regs[VCPU_REGS_RSI]; - a2 = vcpu->regs[VCPU_REGS_RDX]; - a3 = vcpu->regs[VCPU_REGS_RCX]; - a4 = vcpu->regs[VCPU_REGS_R8]; - a5 = vcpu->regs[VCPU_REGS_R9]; - } else -#endif - { - nr = vcpu->regs[VCPU_REGS_RBX] & -1u; - a0 = vcpu->regs[VCPU_REGS_RAX] & -1u; - a1 = vcpu->regs[VCPU_REGS_RCX] & -1u; - a2 = vcpu->regs[VCPU_REGS_RDX] & -1u; - a3 = vcpu->regs[VCPU_REGS_RSI] & -1u; - a4 = vcpu->regs[VCPU_REGS_RDI] & -1u; - a5 = vcpu->regs[VCPU_REGS_RBP] & -1u; + + nr = vcpu->regs[VCPU_REGS_RAX]; + a0 = vcpu->regs[VCPU_REGS_RBX]; + a1 = vcpu->regs[VCPU_REGS_RCX]; + a2 = vcpu->regs[VCPU_REGS_RDX]; + a3 = vcpu->regs[VCPU_REGS_RSI]; + + if (!is_long_mode(vcpu)) { + nr &= 0xFFFFFFFF; + a0 &= 0xFFFFFFFF; + a1 &= 0xFFFFFFFF; + a2 &= 0xFFFFFFFF; + a3 &= 0xFFFFFFFF; } + switch (nr) { default: - run->hypercall.nr = nr; - run->hypercall.args[0] = a0; - run->hypercall.args[1] = a1; - run->hypercall.args[2] = a2; - run->hypercall.args[3] = a3; - run->hypercall.args[4] = a4; - run->hypercall.args[5] = a5; - run->hypercall.ret = ret; - run->hypercall.longmode = is_long_mode(vcpu); - kvm_x86_ops->decache_regs(vcpu); - return 0; + ret = -KVM_ENOSYS; + break; } vcpu->regs[VCPU_REGS_RAX] = ret; kvm_x86_ops->decache_regs(vcpu); - return 1; + return 0; +} +EXPORT_SYMBOL_GPL(kvm_emulate_hypercall); + +int kvm_fix_hypercall(struct kvm_vcpu *vcpu) +{ + char instruction[3]; + int ret = 0; + + mutex_lock(&vcpu->kvm->lock); + + /* + * Blow out the MMU to ensure that no other VCPU has an active mapping + * to ensure that the updated hypercall appears atomically across all + * VCPUs. + */ + kvm_mmu_zap_all(vcpu->kvm); + + kvm_x86_ops->cache_regs(vcpu); + kvm_x86_ops->patch_hypercall(vcpu, instruction); + if (emulator_write_emulated(vcpu->rip, instruction, 3, vcpu) + != X86EMUL_CONTINUE) + ret = -EFAULT; + + mutex_unlock(&vcpu->kvm->lock); + + return ret; } -EXPORT_SYMBOL_GPL(kvm_hypercall); static u64 mk_cr_64(u64 curr_cr, u32 new_val) { @@ -1474,75 +1485,6 @@ void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val, } } -/* - * Register the para guest with the host: - */ -static int vcpu_register_para(struct kvm_vcpu *vcpu, gpa_t para_state_gpa) -{ - struct kvm_vcpu_para_state *para_state; - hpa_t para_state_hpa, hypercall_hpa; - struct page *para_state_page; - unsigned char *hypercall; - gpa_t hypercall_gpa; - - printk(KERN_DEBUG "kvm: guest trying to enter paravirtual mode\n"); - printk(KERN_DEBUG ".... para_state_gpa: %08Lx\n", para_state_gpa); - - /* - * Needs to be page aligned: - */ - if (para_state_gpa != PAGE_ALIGN(para_state_gpa)) - goto err_gp; - - para_state_hpa = gpa_to_hpa(vcpu, para_state_gpa); - printk(KERN_DEBUG ".... para_state_hpa: %08Lx\n", para_state_hpa); - if (is_error_hpa(para_state_hpa)) - goto err_gp; - - mark_page_dirty(vcpu->kvm, para_state_gpa >> PAGE_SHIFT); - para_state_page = pfn_to_page(para_state_hpa >> PAGE_SHIFT); - para_state = kmap(para_state_page); - - printk(KERN_DEBUG ".... guest version: %d\n", para_state->guest_version); - printk(KERN_DEBUG ".... size: %d\n", para_state->size); - - para_state->host_version = KVM_PARA_API_VERSION; - /* - * We cannot support guests that try to register themselves - * with a newer API version than the host supports: - */ - if (para_state->guest_version > KVM_PARA_API_VERSION) { - para_state->ret = -KVM_EINVAL; - goto err_kunmap_skip; - } - - hypercall_gpa = para_state->hypercall_gpa; - hypercall_hpa = gpa_to_hpa(vcpu, hypercall_gpa); - printk(KERN_DEBUG ".... hypercall_hpa: %08Lx\n", hypercall_hpa); - if (is_error_hpa(hypercall_hpa)) { - para_state->ret = -KVM_EINVAL; - goto err_kunmap_skip; - } - - printk(KERN_DEBUG "kvm: para guest successfully registered.\n"); - vcpu->para_state_page = para_state_page; - vcpu->para_state_gpa = para_state_gpa; - vcpu->hypercall_gpa = hypercall_gpa; - - mark_page_dirty(vcpu->kvm, hypercall_gpa >> PAGE_SHIFT); - hypercall = kmap_atomic(pfn_to_page(hypercall_hpa >> PAGE_SHIFT), - KM_USER1) + (hypercall_hpa & ~PAGE_MASK); - kvm_x86_ops->patch_hypercall(vcpu, hypercall); - kunmap_atomic(hypercall, KM_USER1); - - para_state->ret = 0; -err_kunmap_skip: - kunmap(para_state_page); - return 0; -err_gp: - return 1; -} - int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) { u64 data; @@ -1656,12 +1598,6 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data) case MSR_IA32_MISC_ENABLE: vcpu->ia32_misc_enable_msr = data; break; - /* - * This is the 'probe whether the host is KVM' logic: - */ - case MSR_KVM_API_MAGIC: - return vcpu_register_para(vcpu, data); - default: pr_unimpl(vcpu, "unhandled wrmsr: 0x%x\n", msr); return 1; |
