[PATCH v6 03/16] KVM: TDX: Pass KVM page level to tdh_mem_page_add() and tdh_mem_page_aug()

isaku.yamahata
2023-11-07T15:12:18Z

From: Xiaoyao Li <xiaoyao.li@intel.com>

Level info is needed in tdh_clflush_page() to generate the correct page
size.

Besides, explicitly pass level info to SEAMCALL instead of assuming
it's zero. It works naturally when 2MB support lands.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
---
arch/x86/kvm/vmx/tdx.c | 7 ++++---
arch/x86/kvm/vmx/tdx_ops.h | 19 ++++++++++++-------
2 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index 8b58d91bda4e..2d5c86e06c5f 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -1468,7 +1468,7 @@ static int tdx_sept_page_aug(struct kvm *kvm, gfn_t gfn,
union tdx_sept_entry entry;
u64 err;

- err = tdh_mem_page_aug(kvm_tdx->tdr_pa, gpa, hpa, &out);
+ err = tdh_mem_page_aug(kvm_tdx->tdr_pa, gpa, tdx_level, hpa, &out);
if (unlikely(err == TDX_ERROR_SEPT_BUSY)) {
tdx_unpin(kvm, pfn);
return -EAGAIN;
@@ -1497,6 +1497,7 @@ static int tdx_sept_page_aug(struct kvm *kvm, gfn_t gfn,
static int tdx_sept_page_add(struct kvm *kvm, gfn_t gfn,
enum pg_level level, kvm_pfn_t pfn)
{
+ int tdx_level = pg_level_to_tdx_sept_level(level);
struct kvm_tdx *kvm_tdx = to_kvm_tdx(kvm);
hpa_t hpa = pfn_to_hpa(pfn);
gpa_t gpa = gfn_to_gpa(gfn);
@@ -1531,8 +1532,8 @@ static int tdx_sept_page_add(struct kvm *kvm, gfn_t gfn,
kvm_tdx->source_pa = INVALID_PAGE;

do {
- err = tdh_mem_page_add(kvm_tdx->tdr_pa, gpa, hpa, source_pa,
- &out);
+ err = tdh_mem_page_add(kvm_tdx->tdr_pa, gpa, tdx_level, hpa,
+ source_pa, &out);
/*
* This path is executed during populating initial guest memory
* image. i.e. before running any vcpu. Race is rare.
diff --git a/arch/x86/kvm/vmx/tdx_ops.h b/arch/x86/kvm/vmx/tdx_ops.h
index e726102d3523..0f2df7198bde 100644
--- a/arch/x86/kvm/vmx/tdx_ops.h
+++ b/arch/x86/kvm/vmx/tdx_ops.h
@@ -63,6 +63,11 @@ static inline u64 tdx_seamcall(u64 op, u64 rcx, u64 rdx, u64 r8, u64 r9,
void pr_tdx_error(u64 op, u64 error_code, const struct tdx_module_args *out);
#endif

+static inline enum pg_level tdx_sept_level_to_pg_level(int tdx_level)
+{
+ return tdx_level + 1;
+}
+
static inline void tdx_clflush_page(hpa_t addr, enum pg_level level)
{
clflush_cache_range(__va(addr), KVM_HPAGE_SIZE(level));
@@ -104,11 +109,11 @@ static inline u64 tdh_mng_addcx(hpa_t tdr, hpa_t addr)
return tdx_seamcall(TDH_MNG_ADDCX, addr, tdr, 0, 0, NULL);
}

-static inline u64 tdh_mem_page_add(hpa_t tdr, gpa_t gpa, hpa_t hpa, hpa_t source,
- struct tdx_module_args *out)
+static inline u64 tdh_mem_page_add(hpa_t tdr, gpa_t gpa, int level, hpa_t hpa,
+ hpa_t source, struct tdx_module_args *out)
{
- tdx_clflush_page(hpa, PG_LEVEL_4K);
- return tdx_seamcall_sept(TDH_MEM_PAGE_ADD, gpa, tdr, hpa, source, out);
+ tdx_clflush_page(hpa, tdx_sept_level_to_pg_level(level));
+ return tdx_seamcall_sept(TDH_MEM_PAGE_ADD, gpa | level, tdr, hpa, source, out);
}

static inline u64 tdh_mem_sept_add(hpa_t tdr, gpa_t gpa, int level, hpa_t page,
@@ -143,11 +148,11 @@ static inline u64 tdh_mem_page_relocate(hpa_t tdr, gpa_t gpa, hpa_t hpa,
return tdx_seamcall_sept(TDH_MEM_PAGE_RELOCATE, gpa, tdr, hpa, 0, out);
}

-static inline u64 tdh_mem_page_aug(hpa_t tdr, gpa_t gpa, hpa_t hpa,
+static inline u64 tdh_mem_page_aug(hpa_t tdr, gpa_t gpa, int level, hpa_t hpa,
struct tdx_module_args *out)
{
- tdx_clflush_page(hpa, PG_LEVEL_4K);
- return tdx_seamcall_sept(TDH_MEM_PAGE_AUG, gpa, tdr, hpa, 0, out);
+ tdx_clflush_page(hpa, tdx_sept_level_to_pg_level(level));
+ return tdx_seamcall_sept(TDH_MEM_PAGE_AUG, gpa | level, tdr, hpa, 0, out);
}

static inline u64 tdh_mem_range_block(hpa_t tdr, gpa_t gpa, int level,
--
2.25.1