On Thu, 12 Jan 2023 08:31:26 -0800
isaku.yamahata@xxxxxxxxx wrote:
> From: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
>
> As the first step to create TDX guest, create/destroy VM struct. Assign
> TDX private Host Key ID (HKID) to the TDX guest for memory encryption and
> allocate extra pages for the TDX guest. On destruction, free allocated
> pages, and HKID.
>
> Before tearing down private page tables, TDX requires some resources of
> the guest TD to be destroyed (i.e. HKID must have been reclaimed, etc).
> Add flush_shadow_all_private callback before tearing down private page
> tables for it.
>
> Add vm_free() of kvm_x86_ops hook at the end of kvm_arch_destroy_vm()
> because some per-VM TDX resources, e.g. TDR, need to be freed after other
> TDX resources, e.g. HKID, were freed.
>
> Co-developed-by: Kai Huang <kai.huang@xxxxxxxxx>
> Signed-off-by: Kai Huang <kai.huang@xxxxxxxxx>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
> Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
>
> ---
> Changes v10 -> v11:
> - Fix doule free in tdx_vm_free() by setting NULL.
> - replace struct tdx_td_page tdr and tdcs from struct kvm_tdx with
> unsigned long
>
> Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
> ---
> arch/x86/include/asm/kvm-x86-ops.h | 2 +
> arch/x86/include/asm/kvm_host.h | 2 +
> arch/x86/kvm/vmx/main.c | 34 ++-
> arch/x86/kvm/vmx/tdx.c | 415 +++++++++++++++++++++++++++++
> arch/x86/kvm/vmx/tdx.h | 6 +-
> arch/x86/kvm/vmx/x86_ops.h | 9 +
> arch/x86/kvm/x86.c | 8 +
> 7 files changed, 472 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/include/asm/kvm-x86-ops.h
> b/arch/x86/include/asm/kvm-x86-ops.h index e6708bb3f4f6..552de893af75
> 100644 --- a/arch/x86/include/asm/kvm-x86-ops.h
> +++ b/arch/x86/include/asm/kvm-x86-ops.h
> @@ -22,7 +22,9 @@ KVM_X86_OP(has_emulated_msr)
> KVM_X86_OP(vcpu_after_set_cpuid)
> KVM_X86_OP(is_vm_type_supported)
> KVM_X86_OP(vm_init)
> +KVM_X86_OP_OPTIONAL(flush_shadow_all_private)
> KVM_X86_OP_OPTIONAL(vm_destroy)
> +KVM_X86_OP_OPTIONAL(vm_free)
> KVM_X86_OP_OPTIONAL_RET0(vcpu_precreate)
> KVM_X86_OP(vcpu_create)
> KVM_X86_OP(vcpu_free)
> diff --git a/arch/x86/include/asm/kvm_host.h
> b/arch/x86/include/asm/kvm_host.h index 234c28c8e6ee..e199ddf0bb00 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -1540,7 +1540,9 @@ struct kvm_x86_ops {
> bool (*is_vm_type_supported)(unsigned long vm_type);
> unsigned int vm_size;
> int (*vm_init)(struct kvm *kvm);
> + void (*flush_shadow_all_private)(struct kvm *kvm);
> void (*vm_destroy)(struct kvm *kvm);
> + void (*vm_free)(struct kvm *kvm);
>
> /* Create, but do not attach this VCPU */
> int (*vcpu_precreate)(struct kvm *kvm);
> diff --git a/arch/x86/kvm/vmx/main.c b/arch/x86/kvm/vmx/main.c
> index 781fbc896120..c5f2515026e9 100644
> --- a/arch/x86/kvm/vmx/main.c
> +++ b/arch/x86/kvm/vmx/main.c
> @@ -29,14 +29,40 @@ static __init int vt_hardware_setup(void)
> return 0;
> }
>
> +static void vt_hardware_unsetup(void)
> +{
> + tdx_hardware_unsetup();
> + vmx_hardware_unsetup();
> +}
> +
> static int vt_vm_init(struct kvm *kvm)
> {
> if (is_td(kvm))
> - return -EOPNOTSUPP; /* Not ready to create guest
> TD yet. */
> + return tdx_vm_init(kvm);
>
> return vmx_vm_init(kvm);
> }
>
> +static void vt_flush_shadow_all_private(struct kvm *kvm)
> +{
> + if (is_td(kvm))
> + tdx_mmu_release_hkid(kvm);
> +}
> +
> +static void vt_vm_destroy(struct kvm *kvm)
> +{
> + if (is_td(kvm))
> + return;
> +
> + vmx_vm_destroy(kvm);
> +}
> +
> +static void vt_vm_free(struct kvm *kvm)
> +{
> + if (is_td(kvm))
> + tdx_vm_free(kvm);
> +}
> +
> static int vt_mem_enc_ioctl(struct kvm *kvm, void __user *argp)
> {
> if (!is_td(kvm))
> @@ -50,7 +76,7 @@ struct kvm_x86_ops vt_x86_ops __initdata = {
>
> .check_processor_compatibility = vmx_check_processor_compat,
>
> - .hardware_unsetup = vmx_hardware_unsetup,
> + .hardware_unsetup = vt_hardware_unsetup,
>
> .hardware_enable = vmx_hardware_enable,
> .hardware_disable = vmx_hardware_disable,
> @@ -59,7 +85,9 @@ struct kvm_x86_ops vt_x86_ops __initdata = {
> .is_vm_type_supported = vt_is_vm_type_supported,
> .vm_size = sizeof(struct kvm_vmx),
> .vm_init = vt_vm_init,
> - .vm_destroy = vmx_vm_destroy,
> + .flush_shadow_all_private = vt_flush_shadow_all_private,
> + .vm_destroy = vt_vm_destroy,
> + .vm_free = vt_vm_free,
>
> .vcpu_precreate = vmx_vcpu_precreate,
> .vcpu_create = vmx_vcpu_create,
> diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
> index 2bd1cc37abab..d11950d18226 100644
> --- a/arch/x86/kvm/vmx/tdx.c
> +++ b/arch/x86/kvm/vmx/tdx.c
> @@ -6,6 +6,7 @@
> #include "capabilities.h"
> #include "x86_ops.h"
> #include "tdx.h"
> +#include "tdx_ops.h"
> #include "x86.h"
>
> #undef pr_fmt
> @@ -32,6 +33,250 @@ struct tdx_capabilities {
> /* Capabilities of KVM + the TDX module. */
> static struct tdx_capabilities tdx_caps;
>
> +/*
> + * Some TDX SEAMCALLs (TDH.MNG.CREATE, TDH.PHYMEM.CACHE.WB,
> + * TDH.MNG.KEY.RECLAIMID, TDH.MNG.KEY.FREEID etc) tries to acquire a
> global lock
> + * internally in TDX module. If failed, TDX_OPERAND_BUSY is returned
> without
> + * spinning or waiting due to a constraint on execution time. It's
> caller's
> + * responsibility to avoid race (or retry on TDX_OPERAND_BUSY). Use
> this mutex
> + * to avoid race in TDX module because the kernel knows better about
> scheduling.
> + */
> +static DEFINE_MUTEX(tdx_lock);
> +static struct mutex *tdx_mng_key_config_lock;
> +
> +static __always_inline hpa_t set_hkid_to_hpa(hpa_t pa, u16 hkid)
> +{
> + return pa | ((hpa_t)hkid << boot_cpu_data.x86_phys_bits);
> +}
> +
> +static inline bool is_td_created(struct kvm_tdx *kvm_tdx)
> +{
> + return kvm_tdx->tdr_pa;
> +}
> +
> +static inline void tdx_hkid_free(struct kvm_tdx *kvm_tdx)
> +{
> + tdx_keyid_free(kvm_tdx->hkid);
> + kvm_tdx->hkid = 0;
> +}
> +
> +static inline bool is_hkid_assigned(struct kvm_tdx *kvm_tdx)
> +{
> + return kvm_tdx->hkid > 0;
> +}
> +
> +static void tdx_clear_page(unsigned long page_pa)
> +{
> + const void *zero_page = (const void *)
> __va(page_to_phys(ZERO_PAGE(0)));
> + void *page = __va(page_pa);
> + unsigned long i;
> +
> + if (!static_cpu_has(X86_FEATURE_MOVDIR64B)) {
> + clear_page(page);
> + return;
> + }
> +
> + /*
> + * Zeroing the page is only necessary for systems with MKTME-i:
> + * when re-assign one page from old keyid to a new keyid,
> MOVDIR64B is
> + * required to clear/write the page with new keyid to prevent
> integrity
> + * error when read on the page with new keyid.
> + *
> + * clflush doesn't flush cache with HKID set.
> + * The cache line could be poisoned (even without MKTME-i),
> clear the
> + * poison bit.
> + */
> + for (i = 0; i < PAGE_SIZE; i += 64)
> + movdir64b(page + i, zero_page);
> + /*
> + * MOVDIR64B store uses WC buffer. Prevent following memory
> reads
> + * from seeing potentially poisoned cache.
> + */
> + __mb();
> +}
> +
> +static int tdx_reclaim_page(hpa_t pa, bool do_wb, u16 hkid)
> +{
> + struct tdx_module_output out;
> + u64 err;
> +
> + do {
> + err = tdh_phymem_page_reclaim(pa, &out);
> + /*
> + * TDH.PHYMEM.PAGE.RECLAIM is allowed only when TD is
> shutdown.
> + * state. i.e. destructing TD.
> + * TDH.PHYMEM.PAGE.RECLAIM requires TDR and target
> page.
> + * Because we're destructing TD, it's rare to contend
> with TDR.
> + */
> + } while (err == (TDX_OPERAND_BUSY | TDX_OPERAND_ID_RCX));
> + if (WARN_ON_ONCE(err)) {
> + pr_tdx_error(TDH_PHYMEM_PAGE_RECLAIM, err, &out);
> + return -EIO;
> + }
> +
> + if (do_wb) {
> + /*
> + * Only TDR page gets into this path. No contention is
> expected
> + * because of the last page of TD.
> + */
> + err = tdh_phymem_page_wbinvd(set_hkid_to_hpa(pa, hkid));
> + if (WARN_ON_ONCE(err)) {
> + pr_tdx_error(TDH_PHYMEM_PAGE_WBINVD, err, NULL);
> + return -EIO;
> + }
> + }
> +
> + tdx_clear_page(pa);
> + return 0;
> +}
> +
> +static void tdx_reclaim_td_page(unsigned long td_page_pa)
> +{
> + if (!td_page_pa)
> + return;
> + /*
> + * TDCX are being reclaimed. TDX module maps TDCX with HKID
> + * assigned to the TD. Here the cache associated to the TD
> + * was already flushed by TDH.PHYMEM.CACHE.WB before here, So
> + * cache doesn't need to be flushed again.
> + */
> + if (WARN_ON(tdx_reclaim_page(td_page_pa, false, 0)))
> + /* If reclaim failed, leak the page. */
Better add a FIXME: here as this has to be fixed later.
> + return;
> + free_page((unsigned long)__va(td_page_pa));
> +}
> +
> +static int tdx_do_tdh_phymem_cache_wb(void *param)
> +{
> + u64 err = 0;
> +
> + do {
> + err = tdh_phymem_cache_wb(!!err);
> + } while (err == TDX_INTERRUPTED_RESUMABLE);
> +
> + /* Other thread may have done for us. */
> + if (err == TDX_NO_HKID_READY_TO_WBCACHE)
> + err = TDX_SUCCESS;
> + if (WARN_ON_ONCE(err)) {
> + pr_tdx_error(TDH_PHYMEM_CACHE_WB, err, NULL);
> + return -EIO;
> + }
> +
> + return 0;
> +}
> +
> +void tdx_mmu_release_hkid(struct kvm *kvm)
> +{
> + struct kvm_tdx *kvm_tdx = to_kvm_tdx(kvm);
> + cpumask_var_t packages;
> + bool cpumask_allocated;
> + u64 err;
> + int ret;
> + int i;
> +
> + if (!is_hkid_assigned(kvm_tdx))
> + return;
> +
> + if (!is_td_created(kvm_tdx))
> + goto free_hkid;
> +
> + cpumask_allocated = zalloc_cpumask_var(&packages, GFP_KERNEL);
> + cpus_read_lock();
> + for_each_online_cpu(i) {
> + if (cpumask_allocated &&
> +
> cpumask_test_and_set_cpu(topology_physical_package_id(i),
> + packages))
> + continue;
> +
> + /*
> + * We can destroy multiple the guest TDs simultaneously.
> + * Prevent tdh_phymem_cache_wb from returning TDX_BUSY
> by
> + * serialization.
> + */
> + mutex_lock(&tdx_lock);
> + ret = smp_call_on_cpu(i, tdx_do_tdh_phymem_cache_wb,
> NULL, 1);
> + mutex_unlock(&tdx_lock);
> + if (ret)
> + break;
> + }
> + cpus_read_unlock();
> + free_cpumask_var(packages);
> +
> + mutex_lock(&tdx_lock);
> + err = tdh_mng_key_freeid(kvm_tdx->tdr_pa);
> + mutex_unlock(&tdx_lock);
> + if (WARN_ON_ONCE(err)) {
> + pr_tdx_error(TDH_MNG_KEY_FREEID, err, NULL);
> + pr_err("tdh_mng_key_freeid failed. HKID %d is
> leaked.\n",
> + kvm_tdx->hkid);
> + return;
> + }
> +
> +free_hkid:
> + tdx_hkid_free(kvm_tdx);
> +}
> +
> +void tdx_vm_free(struct kvm *kvm)
> +{
> + struct kvm_tdx *kvm_tdx = to_kvm_tdx(kvm);
> + int i;
> +
> + /* Can't reclaim or free TD pages if teardown failed. */
> + if (is_hkid_assigned(kvm_tdx))
> + return;
> +
> + if (kvm_tdx->tdcs_pa) {
> + for (i = 0; i < tdx_caps.tdcs_nr_pages; i++)
> + tdx_reclaim_td_page(kvm_tdx->tdcs_pa[i]);
> + kfree(kvm_tdx->tdcs_pa);
> + kvm_tdx->tdcs_pa = NULL;
> + }
> +
> + if (!kvm_tdx->tdr_pa)
> + return;
> + /*
> + * TDX module maps TDR with TDX global HKID. TDX module may
> access TDR
> + * while operating on TD (Especially reclaiming TDCS). Cache
> flush with
> + * TDX global HKID is needed.
> + */
> + if (tdx_reclaim_page(kvm_tdx->tdr_pa, true, tdx_global_keyid))
> + return;
> +
> + free_page((unsigned long)__va(kvm_tdx->tdr_pa));
> + kvm_tdx->tdr_pa = 0;
> +}
> +
> +static int tdx_do_tdh_mng_key_config(void *param)
> +{
> + hpa_t *tdr_p = param;
> + u64 err;
> +
> + do {
> + err = tdh_mng_key_config(*tdr_p);
> +
> + /*
> + * If it failed to generate a random key, retry it
> because this
> + * is typically caused by an entropy error of the CPU's
> random
> + * number generator.
> + */
> + } while (err == TDX_KEY_GENERATION_FAILED);
> +
> + if (WARN_ON_ONCE(err)) {
> + pr_tdx_error(TDH_MNG_KEY_CONFIG, err, NULL);
> + return -EIO;
> + }
> +
> + return 0;
> +}
> +
> +static int __tdx_td_init(struct kvm *kvm);
> +
> +int tdx_vm_init(struct kvm *kvm)
> +{
> + /* Place holder for now. */
> + return __tdx_td_init(kvm);
> +}
> +
> int tdx_dev_ioctl(void __user *argp)
> {
> struct kvm_tdx_capabilities __user *user_caps;
> @@ -78,6 +323,160 @@ int tdx_dev_ioctl(void __user *argp)
> return 0;
> }
>
> +static int __tdx_td_init(struct kvm *kvm)
> +{
> + struct kvm_tdx *kvm_tdx = to_kvm_tdx(kvm);
> + cpumask_var_t packages;
> + unsigned long *tdcs_pa = NULL;
> + unsigned long tdr_pa = 0;
> + unsigned long va;
> + int ret, i;
> + u64 err;
> +
> + ret = tdx_keyid_alloc();
> + if (ret < 0)
> + return ret;
> + kvm_tdx->hkid = ret;
> +
> + va = __get_free_page(GFP_KERNEL_ACCOUNT);
> + if (!va)
> + goto free_hkid;
> + tdr_pa = __pa(va);
> +
> + tdcs_pa = kcalloc(tdx_caps.tdcs_nr_pages,
> sizeof(*kvm_tdx->tdcs_pa),
> + GFP_KERNEL_ACCOUNT | __GFP_ZERO);
> + if (!tdcs_pa)
> + goto free_tdr;
> + for (i = 0; i < tdx_caps.tdcs_nr_pages; i++) {
> + va = __get_free_page(GFP_KERNEL_ACCOUNT);
> + if (!va)
> + goto free_tdcs;
> + tdcs_pa[i] = __pa(va);
> + }
> +
> + if (!zalloc_cpumask_var(&packages, GFP_KERNEL)) {
> + ret = -ENOMEM;
> + goto free_tdcs;
> + }
> + cpus_read_lock();
> + /*
> + * Need at least one CPU of the package to be online in order to
> + * program all packages for host key id. Check it.
> + */
> + for_each_present_cpu(i)
> + cpumask_set_cpu(topology_physical_package_id(i),
> packages);
> + for_each_online_cpu(i)
> + cpumask_clear_cpu(topology_physical_package_id(i),
> packages);
> + if (!cpumask_empty(packages)) {
> + ret = -EIO;
> + /*
> + * Because it's hard for human operator to figure out
> the
> + * reason, warn it.
> + */
> + pr_warn("All packages need to have online CPU to create
> TD. Online CPU and retry.\n");
> + goto free_packages;
> + }
> +
> + /*
> + * Acquire global lock to avoid TDX_OPERAND_BUSY:
> + * TDH.MNG.CREATE and other APIs try to lock the global Key
> Owner
> + * Table (KOT) to track the assigned TDX private HKID. It
> doesn't spin
> + * to acquire the lock, returns TDX_OPERAND_BUSY instead, and
> let the
> + * caller to handle the contention. This is because of time
> limitation
> + * usable inside the TDX module and OS/VMM knows better about
> process
> + * scheduling.
> + *
> + * APIs to acquire the lock of KOT:
> + * TDH.MNG.CREATE, TDH.MNG.KEY.FREEID, TDH.MNG.VPFLUSHDONE, and
> + * TDH.PHYMEM.CACHE.WB.
> + */
> + mutex_lock(&tdx_lock);
> + err = tdh_mng_create(tdr_pa, kvm_tdx->hkid);
> + mutex_unlock(&tdx_lock);
> + if (WARN_ON_ONCE(err)) {
> + pr_tdx_error(TDH_MNG_CREATE, err, NULL);
> + ret = -EIO;
> + goto free_packages;
> + }
> + kvm_tdx->tdr_pa = tdr_pa;
> +
> + for_each_online_cpu(i) {
> + int pkg = topology_physical_package_id(i);
> +
> + if (cpumask_test_and_set_cpu(pkg, packages))
> + continue;
> +
> + /*
> + * Program the memory controller in the package with an
> + * encryption key associated to a TDX private host key
> id
> + * assigned to this TDR. Concurrent operations on same
> memory
> + * controller results in TDX_OPERAND_BUSY. Avoid this
> race by
> + * mutex.
> + */
> + mutex_lock(&tdx_mng_key_config_lock[pkg]);
> + ret = smp_call_on_cpu(i, tdx_do_tdh_mng_key_config,
> + &kvm_tdx->tdr_pa, true);
> + mutex_unlock(&tdx_mng_key_config_lock[pkg]);
> + if (ret)
> + break;
> + }
> + cpus_read_unlock();
> + free_cpumask_var(packages);
> + if (ret)
> + goto teardown;
> +
> + kvm_tdx->tdcs_pa = tdcs_pa;
> + for (i = 0; i < tdx_caps.tdcs_nr_pages; i++) {
> + err = tdh_mng_addcx(kvm_tdx->tdr_pa, tdcs_pa[i]);
> + if (WARN_ON_ONCE(err)) {
> + pr_tdx_error(TDH_MNG_ADDCX, err, NULL);
> + for (i++; i < tdx_caps.tdcs_nr_pages; i++) {
> + free_page((unsigned
> long)__va(tdcs_pa[i]));
> + tdcs_pa[i] = 0;
> + }
> + ret = -EIO;
> + goto teardown;
> + }
> + }
> +
> + /*
> + * Note, TDH_MNG_INIT cannot be invoked here. TDH_MNG_INIT
> requires a dedicated
> + * ioctl() to define the configure CPUID values for the TD.
> + */
> + return 0;
> +
> + /*
> + * The sequence for freeing resources from a partially
> initialized TD
> + * varies based on where in the initialization flow failure
> occurred.
> + * Simply use the full teardown and destroy, which naturally
> play nice
> + * with partial initialization.
> + */
> +teardown:
> + tdx_mmu_release_hkid(kvm);
> + tdx_vm_free(kvm);
> + return ret;
> +
> +free_packages:
> + cpus_read_unlock();
> + free_cpumask_var(packages);
> +free_tdcs:
> + for (i = 0; i < tdx_caps.tdcs_nr_pages; i++) {
> + if (tdcs_pa[i])
> + free_page((unsigned long)__va(tdcs_pa[i]));
> + }
> + kfree(tdcs_pa);
> + kvm_tdx->tdcs_pa = NULL;
> +
> +free_tdr:
> + if (tdr_pa)
> + free_page((unsigned long)__va(tdr_pa));
> + kvm_tdx->tdr_pa = 0;
> +free_hkid:
> + if (is_hkid_assigned(kvm_tdx))
> + tdx_hkid_free(kvm_tdx);
> + return ret;
> +}
> +
> int tdx_vm_ioctl(struct kvm *kvm, void __user *argp)
> {
> struct kvm_tdx_cmd tdx_cmd;
> @@ -152,6 +551,8 @@ bool tdx_is_vm_type_supported(unsigned long type)
>
> int __init tdx_hardware_setup(struct kvm_x86_ops *x86_ops)
> {
> + int max_pkgs;
> + int i;
> int r;
>
> if (!enable_ept) {
> @@ -159,6 +560,14 @@ int __init tdx_hardware_setup(struct kvm_x86_ops
> *x86_ops) return -EINVAL;
> }
>
> + max_pkgs = topology_max_packages();
> + tdx_mng_key_config_lock = kcalloc(max_pkgs,
> sizeof(*tdx_mng_key_config_lock),
> + GFP_KERNEL);
> + if (!tdx_mng_key_config_lock)
> + return -ENOMEM;
> + for (i = 0; i < max_pkgs; i++)
> + mutex_init(&tdx_mng_key_config_lock[i]);
> +
> /* TDX requires VMX. */
> r = vmxon_all();
> if (!r)
> @@ -167,3 +576,9 @@ int __init tdx_hardware_setup(struct kvm_x86_ops
> *x86_ops)
> return r;
> }
> +
> +void tdx_hardware_unsetup(void)
> +{
> + /* kfree accepts NULL. */
> + kfree(tdx_mng_key_config_lock);
> +}
> diff --git a/arch/x86/kvm/vmx/tdx.h b/arch/x86/kvm/vmx/tdx.h
> index 473013265bd8..e78d72cf4c3a 100644
> --- a/arch/x86/kvm/vmx/tdx.h
> +++ b/arch/x86/kvm/vmx/tdx.h
> @@ -5,7 +5,11 @@
> #ifdef CONFIG_INTEL_TDX_HOST
> struct kvm_tdx {
> struct kvm kvm;
> - /* TDX specific members follow. */
> +
> + unsigned long tdr_pa;
> + unsigned long *tdcs_pa;
> +
> + int hkid;
> };
>
> struct vcpu_tdx {
> diff --git a/arch/x86/kvm/vmx/x86_ops.h b/arch/x86/kvm/vmx/x86_ops.h
> index bb4090dbae37..3d0f519727c6 100644
> --- a/arch/x86/kvm/vmx/x86_ops.h
> +++ b/arch/x86/kvm/vmx/x86_ops.h
> @@ -139,15 +139,24 @@ void vmx_setup_mce(struct kvm_vcpu *vcpu);
>
> #ifdef CONFIG_INTEL_TDX_HOST
> int __init tdx_hardware_setup(struct kvm_x86_ops *x86_ops);
> +void tdx_hardware_unsetup(void);
> bool tdx_is_vm_type_supported(unsigned long type);
> int tdx_dev_ioctl(void __user *argp);
>
> +int tdx_vm_init(struct kvm *kvm);
> +void tdx_mmu_release_hkid(struct kvm *kvm);
> +void tdx_vm_free(struct kvm *kvm);
> int tdx_vm_ioctl(struct kvm *kvm, void __user *argp);
> #else
> static inline int tdx_hardware_setup(struct kvm_x86_ops *x86_ops) {
> return 0; } +static inline void tdx_hardware_unsetup(void) {}
> static inline bool tdx_is_vm_type_supported(unsigned long type) {
> return false; } static inline int tdx_dev_ioctl(void __user *argp) {
> return -EOPNOTSUPP; };
> +static inline int tdx_vm_init(struct kvm *kvm) { return -EOPNOTSUPP; }
> +static inline void tdx_mmu_release_hkid(struct kvm *kvm) {}
> +static inline void tdx_flush_shadow_all_private(struct kvm *kvm) {}
> +static inline void tdx_vm_free(struct kvm *kvm) {}
> static inline int tdx_vm_ioctl(struct kvm *kvm, void __user *argp) {
> return -EOPNOTSUPP; } #endif
>
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 1152a9dc6d84..0fa91a9708aa 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -12337,6 +12337,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
> kvm_page_track_cleanup(kvm);
> kvm_xen_destroy_vm(kvm);
> kvm_hv_destroy_vm(kvm);
> + static_call_cond(kvm_x86_vm_free)(kvm);
> }
>
> static void memslot_rmap_free(struct kvm_memory_slot *slot)
> @@ -12647,6 +12648,13 @@ void kvm_arch_commit_memory_region(struct kvm
> *kvm,
> void kvm_arch_flush_shadow_all(struct kvm *kvm)
> {
> + /*
> + * kvm_mmu_zap_all() zaps both private and shared page tables.
> Before
> + * tearing down private page tables, TDX requires some TD
> resources to
> + * be destroyed (i.e. keyID must have been reclaimed, etc).
> Invoke
> + * kvm_x86_flush_shadow_all_private() for this.
> + */
> + static_call_cond(kvm_x86_flush_shadow_all_private)(kvm);
> kvm_mmu_zap_all(kvm);
> }
>
