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Message-Id: <eb47ea273ecde97ab5aa20b9cffb2d236fea26c7.1670541736.git.isaku.yamahata@intel.com>
Date: Thu, 8 Dec 2022 15:35:48 -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>,
Sean Christopherson <seanjc@...gle.com>,
David Matlack <dmatlack@...gle.com>
Subject: [RFC PATCH v2 13/15] KVM: x86/tdp_mmu: 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>
---
arch/x86/kvm/vmx/tdx.c | 70 ++++++++++++++++++++++++++++++++++++
arch/x86/kvm/vmx/tdx_arch.h | 1 +
arch/x86/kvm/vmx/tdx_errno.h | 2 ++
arch/x86/kvm/vmx/tdx_ops.h | 6 ++++
4 files changed, 79 insertions(+)
diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index ce7026136334..f20e931cf983 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -1487,6 +1487,47 @@ 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_output out;
+ gpa_t gpa = gfn_to_gpa(gfn);
+ u64 err;
+
+ /* See comment in tdx_sept_set_private_spte() */
+ err = tdh_mem_page_promote(kvm_tdx->tdr.pa, gpa, tdx_level, &out);
+ if (err == TDX_ERROR_SEPT_BUSY)
+ return -EAGAIN;
+ if (err == TDX_EPT_INVALID_PROMOTE_CONDITIONS)
+ /*
+ * 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 frees 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 (err == (TDX_OPERAND_BUSY | TDX_OPERAND_ID_RCX));
+ if (WARN_ON_ONCE(err)) {
+ pr_tdx_error(TDH_PHYMEM_PAGE_WBINVD, err, NULL);
+ return -EIO;
+ }
+
+ return 0;
+}
+
static int tdx_sept_zap_private_spte(struct kvm *kvm, gfn_t gfn,
enum pg_level level)
{
@@ -1556,6 +1597,33 @@ static void tdx_track(struct kvm_tdx *kvm_tdx)
}
+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);
+ struct tdx_module_output 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 (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)
{
@@ -2681,9 +2749,11 @@ 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 508d9a1139ce..3a3c9c608bf0 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_VP_RD 26
#define TDH_MNG_KEY_RECLAIMID 27
#define TDH_PHYMEM_PAGE_RECLAIM 28
diff --git a/arch/x86/kvm/vmx/tdx_errno.h b/arch/x86/kvm/vmx/tdx_errno.h
index 389b1b53da25..74a5777c05f1 100644
--- a/arch/x86/kvm/vmx/tdx_errno.h
+++ b/arch/x86/kvm/vmx/tdx_errno.h
@@ -19,6 +19,8 @@
#define TDX_KEY_CONFIGURED 0x0000081500000000ULL
#define TDX_NO_HKID_READY_TO_WBCACHE 0x0000082100000000ULL
#define TDX_EPT_WALK_FAILED 0xC0000B0000000000ULL
+#define TDX_TLB_TRACKING_NOT_DONE 0xC0000B0800000000ULL
+#define TDX_EPT_INVALID_PROMOTE_CONDITIONS 0xC0000B0900000000ULL
/*
* TDG.VP.VMCALL Status Codes (returned in R10)
diff --git a/arch/x86/kvm/vmx/tdx_ops.h b/arch/x86/kvm/vmx/tdx_ops.h
index 60cbc7f94b18..5d2d0b1eed28 100644
--- a/arch/x86/kvm/vmx/tdx_ops.h
+++ b/arch/x86/kvm/vmx/tdx_ops.h
@@ -140,6 +140,12 @@ static inline u64 tdh_mem_page_demote(hpa_t tdr, gpa_t gpa, int level, hpa_t pag
return seamcall_sept(TDH_MEM_PAGE_DEMOTE, gpa | level, tdr, page, 0, out);
}
+static inline u64 tdh_mem_page_promote(hpa_t tdr, gpa_t gpa, int level,
+ struct tdx_module_output *out)
+{
+ return seamcall_sept(TDH_MEM_PAGE_PROMOTE, gpa | level, tdr, 0, 0, out);
+}
+
static inline u64 tdh_mr_extend(hpa_t tdr, gpa_t gpa,
struct tdx_module_output *out)
{
--
2.25.1
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