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target/i386: Add MMU_PHYS_IDX and MMU_NESTED_IDX 

These new mmu indexes will be helpful for improving
paging and code throughout the target.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20221002172956.265735-6-richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Richard Henderson 2022-10-02 10:29:52 -07:00 committed by Paolo Bonzini
parent 9bbcf37219
commit 98281984a3
4 changed files with 60 additions and 30 deletions
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2
target/i386/cpu-param.h
View File

@ -23,7 +23,7 @@
# define TARGET_VIRT_ADDR_SPACE_BITS 32
#endif
#define TARGET_PAGE_BITS 12
#define NB_MMU_MODES 3
#define NB_MMU_MODES 5
#ifndef CONFIG_USER_ONLY
# define TARGET_TB_PCREL 1

3
target/i386/cpu.h
View File

@ -2149,6 +2149,9 @@ uint64_t cpu_get_tsc(CPUX86State *env);
#define MMU_KSMAP_IDX 0
#define MMU_USER_IDX 1
#define MMU_KNOSMAP_IDX 2
#define MMU_NESTED_IDX 3
#define MMU_PHYS_IDX 4
static inline int cpu_mmu_index(CPUX86State *env, bool ifetch)
{
return (env->hflags & HF_CPL_MASK) == 3 ? MMU_USER_IDX :

82
target/i386/tcg/sysemu/excp_helper.c
View File

@ -448,41 +448,65 @@ static bool get_physical_address(CPUX86State *env, vaddr addr,
MMUAccessType access_type, int mmu_idx,
TranslateResult *out, TranslateFault *err)
{
if (!(env->cr[0] & CR0_PG_MASK)) {
out->paddr = addr & x86_get_a20_mask(env);
TranslateParams in;
bool use_stage2 = env->hflags2 & HF2_NPT_MASK;
#ifdef TARGET_X86_64
if (!(env->hflags & HF_LMA_MASK)) {
/* Without long mode we can only address 32bits in real mode */
out->paddr = (uint32_t)out->paddr;
}
#endif
out->prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
out->page_size = TARGET_PAGE_SIZE;
return true;
} else {
TranslateParams in = {
.addr = addr,
.cr3 = env->cr[3],
.pg_mode = get_pg_mode(env),
.mmu_idx = mmu_idx,
.access_type = access_type,
.use_stage2 = env->hflags2 & HF2_NPT_MASK,
};
in.addr = addr;
in.access_type = access_type;
if (in.pg_mode & PG_MODE_LMA) {
/* test virtual address sign extension */
int shift = in.pg_mode & PG_MODE_LA57 ? 56 : 47;
int64_t sext = (int64_t)addr >> shift;
if (sext != 0 && sext != -1) {
err->exception_index = EXCP0D_GPF;
err->error_code = 0;
err->cr2 = addr;
switch (mmu_idx) {
case MMU_PHYS_IDX:
break;
case MMU_NESTED_IDX:
if (likely(use_stage2)) {
in.cr3 = env->nested_cr3;
in.pg_mode = env->nested_pg_mode;
in.mmu_idx = MMU_USER_IDX;
in.use_stage2 = false;
if (!mmu_translate(env, &in, out, err)) {
err->stage2 = S2_GPA;
return false;
}
return true;
}
return mmu_translate(env, &in, out, err);
break;
default:
in.cr3 = env->cr[3];
in.mmu_idx = mmu_idx;
in.use_stage2 = use_stage2;
in.pg_mode = get_pg_mode(env);
if (likely(in.pg_mode)) {
if (in.pg_mode & PG_MODE_LMA) {
/* test virtual address sign extension */
int shift = in.pg_mode & PG_MODE_LA57 ? 56 : 47;
int64_t sext = (int64_t)addr >> shift;
if (sext != 0 && sext != -1) {
err->exception_index = EXCP0D_GPF;
err->error_code = 0;
err->cr2 = addr;
return false;
}
}
return mmu_translate(env, &in, out, err);
}
break;
}
/* Translation disabled. */
out->paddr = addr & x86_get_a20_mask(env);
#ifdef TARGET_X86_64
if (!(env->hflags & HF_LMA_MASK)) {
/* Without long mode we can only address 32bits in real mode */
out->paddr = (uint32_t)out->paddr;
}
#endif
out->prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
out->page_size = TARGET_PAGE_SIZE;
return true;
}
bool x86_cpu_tlb_fill(CPUState *cs, vaddr addr, int size,

3
target/i386/tcg/sysemu/svm_helper.c
View File

@ -271,6 +271,8 @@ void helper_vmrun(CPUX86State *env, int aflag, int next_eip_addend)
env->hflags2 |= HF2_NPT_MASK;
env->nested_pg_mode = get_pg_mode(env) & PG_MODE_SVM_MASK;
tlb_flush_by_mmuidx(cs, 1 << MMU_NESTED_IDX);
}
/* enable intercepts */
@ -720,6 +722,7 @@ void do_vmexit(CPUX86State *env)
env->vm_vmcb + offsetof(struct vmcb, control.int_state), 0);
}
env->hflags2 &= ~HF2_NPT_MASK;
tlb_flush_by_mmuidx(cs, 1 << MMU_NESTED_IDX);
/* Save the VM state in the vmcb */
svm_save_seg(env, env->vm_vmcb + offsetof(struct vmcb, save.es),