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Message-Id: <4eac53599fb87c41aee14577b66d0a832e6c836b.1705965958.git.isaku.yamahata@intel.com>
Date: Mon, 22 Jan 2024 16:22:26 -0800
From: isaku.yamahata@...el.com
To: kvm@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: isaku.yamahata@...el.com,
isaku.yamahata@...il.com,
Paolo Bonzini <pbonzini@...hat.com>,
erdemaktas@...gle.com,
Sean Christopherson <seanjc@...gle.com>,
Sagi Shahar <sagis@...gle.com>,
Kai Huang <kai.huang@...el.com>,
chen.bo@...el.com,
hang.yuan@...el.com,
tina.zhang@...el.com
Subject: [PATCH v7 11/13] KVM: TDX: Implement merge pages into a large page
From: Isaku Yamahata <isaku.yamahata@...el.com>
Implement merge_private_stp callback.
Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
v7:
- Fix subject, x86/tdp_mmu => TDX
- comment: use ulink instead of free for clarity
v6:
- repeat TDH.MEM.PAGE.PROMOTE() on TDX_INTERRUPTED_RESTARTABLE
---
arch/x86/kvm/vmx/tdx.c | 74 ++++++++++++++++++++++++++++++++++++
arch/x86/kvm/vmx/tdx_arch.h | 1 +
arch/x86/kvm/vmx/tdx_errno.h | 2 +
arch/x86/kvm/vmx/tdx_ops.h | 11 ++++++
4 files changed, 88 insertions(+)
diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index 10dbe4a4db7a..f26caa496d1b 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -1742,6 +1742,51 @@ static int tdx_sept_split_private_spt(struct kvm *kvm, gfn_t gfn,
return 0;
}
+static int tdx_sept_merge_private_spt(struct kvm *kvm, gfn_t gfn,
+ enum pg_level level, void *private_spt)
+{
+ int tdx_level = pg_level_to_tdx_sept_level(level);
+ struct kvm_tdx *kvm_tdx = to_kvm_tdx(kvm);
+ struct tdx_module_args out;
+ gpa_t gpa = gfn_to_gpa(gfn) & KVM_HPAGE_MASK(level);
+ u64 err;
+
+ /* See comment in tdx_sept_set_private_spte() */
+ do {
+ err = tdh_mem_page_promote(kvm_tdx->tdr_pa, gpa, tdx_level, &out);
+ } while (err == TDX_INTERRUPTED_RESTARTABLE);
+ if (unlikely(err == TDX_ERROR_SEPT_BUSY))
+ return -EAGAIN;
+ if (unlikely(err == (TDX_EPT_INVALID_PROMOTE_CONDITIONS |
+ TDX_OPERAND_ID_RCX)))
+ /*
+ * Some pages are accepted, some pending. Need to wait for TD
+ * to accept all pages. Tell it the caller.
+ */
+ return -EAGAIN;
+ if (KVM_BUG_ON(err, kvm)) {
+ pr_tdx_error(TDH_MEM_PAGE_PROMOTE, err, &out);
+ return -EIO;
+ }
+ WARN_ON_ONCE(out.rcx != __pa(private_spt));
+
+ /*
+ * TDH.MEM.PAGE.PROMOTE unlinks the Secure-EPT page for the lower level.
+ * Flush cache for reuse.
+ */
+ do {
+ err = tdh_phymem_page_wbinvd(set_hkid_to_hpa(__pa(private_spt),
+ to_kvm_tdx(kvm)->hkid));
+ } while (unlikely(err == (TDX_OPERAND_BUSY | TDX_OPERAND_ID_RCX)));
+ if (WARN_ON_ONCE(err)) {
+ pr_tdx_error(TDH_PHYMEM_PAGE_WBINVD, err, NULL);
+ return -EIO;
+ }
+
+ tdx_clear_page(__pa(private_spt), PAGE_SIZE);
+ return 0;
+}
+
static int tdx_sept_zap_private_spte(struct kvm *kvm, gfn_t gfn,
enum pg_level level)
{
@@ -1816,6 +1861,33 @@ static void tdx_track(struct kvm *kvm)
}
+static int tdx_sept_unzap_private_spte(struct kvm *kvm, gfn_t gfn,
+ enum pg_level level)
+{
+ int tdx_level = pg_level_to_tdx_sept_level(level);
+ struct kvm_tdx *kvm_tdx = to_kvm_tdx(kvm);
+ gpa_t gpa = gfn_to_gpa(gfn) & KVM_HPAGE_MASK(level);
+ struct tdx_module_args out;
+ u64 err;
+
+ do {
+ err = tdh_mem_range_unblock(kvm_tdx->tdr_pa, gpa, tdx_level, &out);
+
+ /*
+ * tdh_mem_range_block() is accompanied with tdx_track() via kvm
+ * remote tlb flush. Wait for the caller of
+ * tdh_mem_range_block() to complete TDX track.
+ */
+ } while (err == (TDX_TLB_TRACKING_NOT_DONE | TDX_OPERAND_ID_SEPT));
+ if (unlikely(err == TDX_ERROR_SEPT_BUSY))
+ return -EAGAIN;
+ if (KVM_BUG_ON(err, kvm)) {
+ pr_tdx_error(TDH_MEM_RANGE_UNBLOCK, err, &out);
+ return -EIO;
+ }
+ return 0;
+}
+
static int tdx_sept_free_private_spt(struct kvm *kvm, gfn_t gfn,
enum pg_level level, void *private_spt)
{
@@ -3309,9 +3381,11 @@ int __init tdx_hardware_setup(struct kvm_x86_ops *x86_ops)
x86_ops->link_private_spt = tdx_sept_link_private_spt;
x86_ops->free_private_spt = tdx_sept_free_private_spt;
x86_ops->split_private_spt = tdx_sept_split_private_spt;
+ x86_ops->merge_private_spt = tdx_sept_merge_private_spt;
x86_ops->set_private_spte = tdx_sept_set_private_spte;
x86_ops->remove_private_spte = tdx_sept_remove_private_spte;
x86_ops->zap_private_spte = tdx_sept_zap_private_spte;
+ x86_ops->unzap_private_spte = tdx_sept_unzap_private_spte;
return 0;
diff --git a/arch/x86/kvm/vmx/tdx_arch.h b/arch/x86/kvm/vmx/tdx_arch.h
index e663abaa3aa0..aef6103c6515 100644
--- a/arch/x86/kvm/vmx/tdx_arch.h
+++ b/arch/x86/kvm/vmx/tdx_arch.h
@@ -29,6 +29,7 @@
#define TDH_MNG_KEY_FREEID 20
#define TDH_MNG_INIT 21
#define TDH_VP_INIT 22
+#define TDH_MEM_PAGE_PROMOTE 23
#define TDH_MEM_SEPT_RD 25
#define TDH_VP_RD 26
#define TDH_MNG_KEY_RECLAIMID 27
diff --git a/arch/x86/kvm/vmx/tdx_errno.h b/arch/x86/kvm/vmx/tdx_errno.h
index d08b4d14e57b..4142487f987e 100644
--- a/arch/x86/kvm/vmx/tdx_errno.h
+++ b/arch/x86/kvm/vmx/tdx_errno.h
@@ -24,6 +24,8 @@
#define TDX_FLUSHVP_NOT_DONE 0x8000082400000000ULL
#define TDX_EPT_WALK_FAILED 0xC0000B0000000000ULL
#define TDX_EPT_ENTRY_NOT_FREE 0xC0000B0200000000ULL
+#define TDX_TLB_TRACKING_NOT_DONE 0xC0000B0800000000ULL
+#define TDX_EPT_INVALID_PROMOTE_CONDITIONS 0xC0000B0900000000ULL
#define TDX_EPT_ENTRY_STATE_INCORRECT 0xC0000B0D00000000ULL
/*
diff --git a/arch/x86/kvm/vmx/tdx_ops.h b/arch/x86/kvm/vmx/tdx_ops.h
index 772e2e7d61e7..e2b9f1c3d67f 100644
--- a/arch/x86/kvm/vmx/tdx_ops.h
+++ b/arch/x86/kvm/vmx/tdx_ops.h
@@ -262,6 +262,17 @@ static inline u64 tdh_mem_page_demote(hpa_t tdr, gpa_t gpa, int level, hpa_t pag
return tdx_seamcall_sept(TDH_MEM_PAGE_DEMOTE, &in, out);
}
+static inline u64 tdh_mem_page_promote(hpa_t tdr, gpa_t gpa, int level,
+ struct tdx_module_args *out)
+{
+ struct tdx_module_args in = {
+ .rcx = gpa | level,
+ .rdx = tdr,
+ };
+
+ return tdx_seamcall_sept(TDH_MEM_PAGE_PROMOTE, &in, out);
+}
+
static inline u64 tdh_mr_extend(hpa_t tdr, gpa_t gpa,
struct tdx_module_args *out)
{
--
2.25.1
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