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target/i386: introduce function to query MMU indices

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Remove knowledge of specific MMU indexes (other than MMU_NESTED_IDX and
MMU_PHYS_IDX) from mmu_translate().  This will make it possible to split
32-bit and 64-bit MMU indexes.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit 5f97afe2543f09160a8d123ab6e2e8c6d98fa9ce)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
(Mjt: context fixup in target/i386/cpu.h due to other changes in that area)
This commit is contained in:
Paolo Bonzini 2024-01-02 15:36:51 +01:00 committed by Michael Tokarev
parent 25bdc64b62
commit a85b8ec872
2 changed files with 12 additions and 2 deletions
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10
target/i386/cpu.h
View File

@ -2302,6 +2302,16 @@ static inline int cpu_mmu_index(CPUX86State *env, bool ifetch)
? MMU_KNOSMAP_IDX : MMU_KSMAP_IDX;
}
static inline bool is_mmu_index_smap(int mmu_index)
{
return mmu_index == MMU_KSMAP_IDX;
}
static inline bool is_mmu_index_user(int mmu_index)
{
return mmu_index == MMU_USER_IDX;
}
static inline bool is_mmu_index_32(int mmu_index)
{
assert(mmu_index < MMU_PHYS_IDX);

4
target/i386/tcg/sysemu/excp_helper.c
View File

@ -136,7 +136,7 @@ static bool mmu_translate(CPUX86State *env, const TranslateParams *in,
{
const target_ulong addr = in->addr;
const int pg_mode = in->pg_mode;
const bool is_user = (in->mmu_idx == MMU_USER_IDX);
const bool is_user = is_mmu_index_user(in->mmu_idx);
const MMUAccessType access_type = in->access_type;
uint64_t ptep, pte, rsvd_mask;
PTETranslate pte_trans = {
@ -357,7 +357,7 @@ do_check_protect_pse36:
}
int prot = 0;
if (in->mmu_idx != MMU_KSMAP_IDX || !(ptep & PG_USER_MASK)) {
if (!is_mmu_index_smap(in->mmu_idx) || !(ptep & PG_USER_MASK)) {
prot |= PAGE_READ;
if ((ptep & PG_RW_MASK) || !(is_user || (pg_mode & PG_MODE_WP))) {
prot |= PAGE_WRITE;