diff mbox series

[Stable-7.2.10,41/47] target/i386: mask high bits of CR3 in 32-bit mode

Message ID 20240228203521.267565-8-mjt@tls.msk.ru
State New
Headers show
Series Patch Round-up for stable 7.2.10, freeze on 2024-03-02 | expand

Commit Message

Michael Tokarev Feb. 28, 2024, 8:35 p.m. UTC 
From: Paolo Bonzini <pbonzini@redhat.com>

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: 4a1e9d4d11c ("target/i386: Use atomic operations for pte updates", 2022-10-18)
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit 68fb78d7d5723066ec2cacee7d25d67a4143b42f)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
diff mbox series

Patch

diff --git a/target/i386/tcg/sysemu/excp_helper.c b/target/i386/tcg/sysemu/excp_helper.c
index 55bd1194d3..c253226b3c 100644
--- a/target/i386/tcg/sysemu/excp_helper.c
+++ b/target/i386/tcg/sysemu/excp_helper.c
@@ -236,7 +236,7 @@  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;
             }
@@ -304,7 +304,7 @@  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;
         }