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Commit 47f7dc4b authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm 

Pull kvm fixes from Paolo Bonzini:
 "Miscellaneous bugfixes, plus a small patchlet related to Spectre v2"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  kvmclock: fix TSC calibration for nested guests
  KVM: VMX: Mark VMXArea with revision_id of physical CPU even when eVMCS enabled
  KVM: irqfd: fix race between EPOLLHUP and irq_bypass_register_consumer
  KVM/Eventfd: Avoid crash when assign and deassign specific eventfd in parallel.
  x86/kvmclock: set pvti_cpu0_va after enabling kvmclock
  x86/kvm/Kconfig: Ensure CRYPTO_DEV_CCP_DD state at minimum matches KVM_AMD
  kvm: nVMX: Restore exit qual for VM-entry failure due to MSR loading
  x86/kvm/vmx: don't read current->thread.{fs,gs}base of legacy tasks
  KVM: VMX: support MSR_IA32_ARCH_CAPABILITIES as a feature MSR
parents 3c53776e e10f7805

arch/x86/kernel/kvmclock.c

+6 −6
Original line number Diff line number Diff line
@@ -138,6 +138,7 @@ static unsigned long kvm_get_tsc_khz(void) 
	src = &hv_clock[cpu].pvti;

	tsc_khz = pvclock_tsc_khz(src);

	put_cpu();

	setup_force_cpu_cap(X86_FEATURE_TSC_KNOWN_FREQ);

	return tsc_khz;

}
@@ -319,6 +320,8 @@ void __init kvmclock_init(void) 
	printk(KERN_INFO "kvm-clock: Using msrs %x and %x",

		msr_kvm_system_time, msr_kvm_wall_clock);



	pvclock_set_pvti_cpu0_va(hv_clock);



	if (kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE_STABLE_BIT))

		pvclock_set_flags(PVCLOCK_TSC_STABLE_BIT);
@@ -366,13 +369,10 @@ int __init kvm_setup_vsyscall_timeinfo(void) 
	vcpu_time = &hv_clock[cpu].pvti;

	flags = pvclock_read_flags(vcpu_time);



	if (!(flags & PVCLOCK_TSC_STABLE_BIT)) {

	put_cpu();

		return 1;

	}



	pvclock_set_pvti_cpu0_va(hv_clock);

	put_cpu();

	if (!(flags & PVCLOCK_TSC_STABLE_BIT))

		return 1;



	kvm_clock.archdata.vclock_mode = VCLOCK_PVCLOCK;

#endif

arch/x86/kvm/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -85,7 +85,7 @@ config KVM_AMD_SEV 
	def_bool y

	bool "AMD Secure Encrypted Virtualization (SEV) support"

	depends on KVM_AMD && X86_64

	depends on CRYPTO_DEV_CCP && CRYPTO_DEV_CCP_DD && CRYPTO_DEV_SP_PSP

	depends on CRYPTO_DEV_SP_PSP && !(KVM_AMD=y && CRYPTO_DEV_CCP_DD=m)

	---help---

	Provides support for launching Encrypted VMs on AMD processors.

arch/x86/kvm/vmx.c

+42 −19
Original line number Diff line number Diff line
@@ -2571,6 +2571,7 @@ static void vmx_save_host_state(struct kvm_vcpu *vcpu) 
	struct vcpu_vmx *vmx = to_vmx(vcpu);

#ifdef CONFIG_X86_64

	int cpu = raw_smp_processor_id();

	unsigned long fs_base, kernel_gs_base;

#endif

	int i;
@@ -2586,12 +2587,20 @@ static void vmx_save_host_state(struct kvm_vcpu *vcpu) 
	vmx->host_state.gs_ldt_reload_needed = vmx->host_state.ldt_sel;



#ifdef CONFIG_X86_64

	if (likely(is_64bit_mm(current->mm))) {

		save_fsgs_for_kvm();

		vmx->host_state.fs_sel = current->thread.fsindex;

		vmx->host_state.gs_sel = current->thread.gsindex;

#else

		fs_base = current->thread.fsbase;

		kernel_gs_base = current->thread.gsbase;

	} else {

#endif

		savesegment(fs, vmx->host_state.fs_sel);

		savesegment(gs, vmx->host_state.gs_sel);

#ifdef CONFIG_X86_64

		fs_base = read_msr(MSR_FS_BASE);

		kernel_gs_base = read_msr(MSR_KERNEL_GS_BASE);

	}

#endif

	if (!(vmx->host_state.fs_sel & 7)) {

		vmcs_write16(HOST_FS_SELECTOR, vmx->host_state.fs_sel);
@@ -2611,10 +2620,10 @@ static void vmx_save_host_state(struct kvm_vcpu *vcpu) 
	savesegment(ds, vmx->host_state.ds_sel);

	savesegment(es, vmx->host_state.es_sel);



	vmcs_writel(HOST_FS_BASE, current->thread.fsbase);

	vmcs_writel(HOST_FS_BASE, fs_base);

	vmcs_writel(HOST_GS_BASE, cpu_kernelmode_gs_base(cpu));



	vmx->msr_host_kernel_gs_base = current->thread.gsbase;

	vmx->msr_host_kernel_gs_base = kernel_gs_base;

	if (is_long_mode(&vmx->vcpu))

		wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);

#else
@@ -4322,10 +4331,6 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf) 
	vmcs_conf->order = get_order(vmcs_conf->size);

	vmcs_conf->basic_cap = vmx_msr_high & ~0x1fff;



	/* KVM supports Enlightened VMCS v1 only */

	if (static_branch_unlikely(&enable_evmcs))

		vmcs_conf->revision_id = KVM_EVMCS_VERSION;

	else

	vmcs_conf->revision_id = vmx_msr_low;



	vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control;
@@ -4396,7 +4401,13 @@ static struct vmcs *alloc_vmcs_cpu(int cpu) 
		return NULL;

	vmcs = page_address(pages);

	memset(vmcs, 0, vmcs_config.size);

	vmcs->revision_id = vmcs_config.revision_id; /* vmcs revision id */



	/* KVM supports Enlightened VMCS v1 only */

	if (static_branch_unlikely(&enable_evmcs))

		vmcs->revision_id = KVM_EVMCS_VERSION;

	else

		vmcs->revision_id = vmcs_config.revision_id;



	return vmcs;

}
@@ -4564,6 +4575,19 @@ static __init int alloc_kvm_area(void) 
			return -ENOMEM;

		}



		/*

		 * When eVMCS is enabled, alloc_vmcs_cpu() sets

		 * vmcs->revision_id to KVM_EVMCS_VERSION instead of

		 * revision_id reported by MSR_IA32_VMX_BASIC.

		 *

		 * However, even though not explictly documented by

		 * TLFS, VMXArea passed as VMXON argument should

		 * still be marked with revision_id reported by

		 * physical CPU.

		 */

		if (static_branch_unlikely(&enable_evmcs))

			vmcs->revision_id = vmcs_config.revision_id;



		per_cpu(vmxarea, cpu) = vmcs;

	}

	return 0;
@@ -11753,7 +11777,6 @@ static int enter_vmx_non_root_mode(struct kvm_vcpu *vcpu) 
{

	struct vcpu_vmx *vmx = to_vmx(vcpu);

	struct vmcs12 *vmcs12 = get_vmcs12(vcpu);

	u32 msr_entry_idx;

	u32 exit_qual;

	int r;
@@ -11775,10 +11798,10 @@ static int enter_vmx_non_root_mode(struct kvm_vcpu *vcpu) 
	nested_get_vmcs12_pages(vcpu, vmcs12);



	r = EXIT_REASON_MSR_LOAD_FAIL;

	msr_entry_idx = nested_vmx_load_msr(vcpu,

	exit_qual = nested_vmx_load_msr(vcpu,

					vmcs12->vm_entry_msr_load_addr,

					vmcs12->vm_entry_msr_load_count);

	if (msr_entry_idx)

	if (exit_qual)

		goto fail;



	/*

arch/x86/kvm/x86.c

+3 −1
Original line number Diff line number Diff line
@@ -1097,6 +1097,7 @@ static u32 msr_based_features[] = { 


	MSR_F10H_DECFG,

	MSR_IA32_UCODE_REV,

	MSR_IA32_ARCH_CAPABILITIES,

};



static unsigned int num_msr_based_features;
@@ -1105,7 +1106,8 @@ static int kvm_get_msr_feature(struct kvm_msr_entry *msr) 
{

	switch (msr->index) {

	case MSR_IA32_UCODE_REV:

		rdmsrl(msr->index, msr->data);

	case MSR_IA32_ARCH_CAPABILITIES:

		rdmsrl_safe(msr->index, &msr->data);

		break;

	default:

		if (kvm_x86_ops->get_msr_feature(msr))

virt/kvm/eventfd.c

+11 −6
Original line number Diff line number Diff line
@@ -119,8 +119,12 @@ irqfd_shutdown(struct work_struct *work) 
{

	struct kvm_kernel_irqfd *irqfd =

		container_of(work, struct kvm_kernel_irqfd, shutdown);

	struct kvm *kvm = irqfd->kvm;

	u64 cnt;



	/* Make sure irqfd has been initalized in assign path. */

	synchronize_srcu(&kvm->irq_srcu);



	/*

	 * Synchronize with the wait-queue and unhook ourselves to prevent

	 * further events.
@@ -387,7 +391,6 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args) 


	idx = srcu_read_lock(&kvm->irq_srcu);

	irqfd_update(kvm, irqfd);

	srcu_read_unlock(&kvm->irq_srcu, idx);



	list_add_tail(&irqfd->list, &kvm->irqfds.items);
@@ -402,11 +405,6 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args) 
	if (events & EPOLLIN)

		schedule_work(&irqfd->inject);



	/*

	 * do not drop the file until the irqfd is fully initialized, otherwise

	 * we might race against the EPOLLHUP

	 */

	fdput(f);

#ifdef CONFIG_HAVE_KVM_IRQ_BYPASS

	if (kvm_arch_has_irq_bypass()) {

		irqfd->consumer.token = (void *)irqfd->eventfd;
@@ -421,6 +419,13 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args) 
	}

#endif



	srcu_read_unlock(&kvm->irq_srcu, idx);



	/*

	 * do not drop the file until the irqfd is fully initialized, otherwise

	 * we might race against the EPOLLHUP

	 */

	fdput(f);

	return 0;



fail: