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target/i386: mask high bits of CR3 in 32-bit mode 

CR3 bits 63:32 are ignored in 32-bit mode (either legacy 2-level
paging or PAE paging).  Do this in mmu_translate() to remove
the last where get_physical_address() meaningfully drops the high
bits of the address.

Cc: qemu-stable@nongnu.org
Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Fixes: 4a1e9d4d11 ("target/i386: Use atomic operations for pte updates", 2022-10-18)
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2023-12-22 09:27:36 +01:00
parent 84e945aad2
commit 68fb78d7d5
1 changed files with 2 additions and 2 deletions
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4
target/i386/tcg/sysemu/excp_helper.c
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@ -238,7 +238,7 @@ static bool mmu_translate(CPUX86State *env, const TranslateParams *in,
/*
* Page table level 3
*/
pte_addr = ((in->cr3 & ~0x1f) + ((addr >> 27) & 0x18)) & a20_mask;
pte_addr = ((in->cr3 & 0xffffffe0ULL) + ((addr >> 27) & 0x18)) & a20_mask;
if (!ptw_translate(&pte_trans, pte_addr)) {
return false;
}
@ -306,7 +306,7 @@ static bool mmu_translate(CPUX86State *env, const TranslateParams *in,
/*
* Page table level 2
*/
pte_addr = ((in->cr3 & ~0xfff) + ((addr >> 20) & 0xffc)) & a20_mask;
pte_addr = ((in->cr3 & 0xfffff000ULL) + ((addr >> 20) & 0xffc)) & a20_mask;
if (!ptw_translate(&pte_trans, pte_addr)) {
return false;
}