[PATCH v2] accel/tcg: Fix typo causing tb->page_addr[1] to not be recorded

Anton Johansson via posted 1 patch 1 month ago
Patches applied successfully (tree, apply log)
git fetch https://github.com/patchew-project/qemu tags/patchew/20240612131509.14132-1-anjo@rev.ng
Maintainers: Richard Henderson <richard.henderson@linaro.org>, Paolo Bonzini <pbonzini@redhat.com>
There is a newer version of this series
accel/tcg/tb-maint.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
[PATCH v2] accel/tcg: Fix typo causing tb->page_addr[1] to not be recorded
Posted by Anton Johansson via 1 month ago
For TBs crossing page boundaries, the 2nd page will never be
recorded/removed, as the index of the 2nd page is computed from the
address of the 1st page. This is due to a typo, fix it.

Signed-off-by: Anton Johansson <anjo@rev.ng>
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 accel/tcg/tb-maint.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/accel/tcg/tb-maint.c b/accel/tcg/tb-maint.c
index 19ae6793f3..cc0f5afd47 100644
--- a/accel/tcg/tb-maint.c
+++ b/accel/tcg/tb-maint.c
@@ -713,7 +713,7 @@ static void tb_record(TranslationBlock *tb)
     tb_page_addr_t paddr0 = tb_page_addr0(tb);
     tb_page_addr_t paddr1 = tb_page_addr1(tb);
     tb_page_addr_t pindex0 = paddr0 >> TARGET_PAGE_BITS;
-    tb_page_addr_t pindex1 = paddr0 >> TARGET_PAGE_BITS;
+    tb_page_addr_t pindex1 = paddr1 >> TARGET_PAGE_BITS;
 
     assert(paddr0 != -1);
     if (unlikely(paddr1 != -1) && pindex0 != pindex1) {
@@ -745,7 +745,7 @@ static void tb_remove(TranslationBlock *tb)
     tb_page_addr_t paddr0 = tb_page_addr0(tb);
     tb_page_addr_t paddr1 = tb_page_addr1(tb);
     tb_page_addr_t pindex0 = paddr0 >> TARGET_PAGE_BITS;
-    tb_page_addr_t pindex1 = paddr0 >> TARGET_PAGE_BITS;
+    tb_page_addr_t pindex1 = paddr1 >> TARGET_PAGE_BITS;
 
     assert(paddr0 != -1);
     if (unlikely(paddr1 != -1) && pindex0 != pindex1) {
-- 
2.45.0


Re: [PATCH v2] accel/tcg: Fix typo causing tb->page_addr[1] to not be recorded
Posted by Philippe Mathieu-Daudé 1 month ago
On 12/6/24 15:15, Anton Johansson wrote:
> For TBs crossing page boundaries, the 2nd page will never be
> recorded/removed, as the index of the 2nd page is computed from the
> address of the 1st page. This is due to a typo, fix it.

Please keep these tags as they are useful when backporting
(maintainer taking your patch could amend them):

Cc: qemu-stable@nongnu.org
Fixes: deba78709a ("accel/tcg: Always lock pages before translation")

> Signed-off-by: Anton Johansson <anjo@rev.ng>
> Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> ---
>   accel/tcg/tb-maint.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/accel/tcg/tb-maint.c b/accel/tcg/tb-maint.c
> index 19ae6793f3..cc0f5afd47 100644
> --- a/accel/tcg/tb-maint.c
> +++ b/accel/tcg/tb-maint.c
> @@ -713,7 +713,7 @@ static void tb_record(TranslationBlock *tb)
>       tb_page_addr_t paddr0 = tb_page_addr0(tb);
>       tb_page_addr_t paddr1 = tb_page_addr1(tb);
>       tb_page_addr_t pindex0 = paddr0 >> TARGET_PAGE_BITS;
> -    tb_page_addr_t pindex1 = paddr0 >> TARGET_PAGE_BITS;
> +    tb_page_addr_t pindex1 = paddr1 >> TARGET_PAGE_BITS;
>   
>       assert(paddr0 != -1);
>       if (unlikely(paddr1 != -1) && pindex0 != pindex1) {
> @@ -745,7 +745,7 @@ static void tb_remove(TranslationBlock *tb)
>       tb_page_addr_t paddr0 = tb_page_addr0(tb);
>       tb_page_addr_t paddr1 = tb_page_addr1(tb);
>       tb_page_addr_t pindex0 = paddr0 >> TARGET_PAGE_BITS;
> -    tb_page_addr_t pindex1 = paddr0 >> TARGET_PAGE_BITS;
> +    tb_page_addr_t pindex1 = paddr1 >> TARGET_PAGE_BITS;
>   
>       assert(paddr0 != -1);
>       if (unlikely(paddr1 != -1) && pindex0 != pindex1) {


Re: [PATCH v2] accel/tcg: Fix typo causing tb->page_addr[1] to not be recorded
Posted by Anton Johansson via 1 month ago
On 12/06/24, Philippe Mathieu-Daudé wrote:
> On 12/6/24 15:15, Anton Johansson wrote:
> > For TBs crossing page boundaries, the 2nd page will never be
> > recorded/removed, as the index of the 2nd page is computed from the
> > address of the 1st page. This is due to a typo, fix it.
> 
> Please keep these tags as they are useful when backporting
> (maintainer taking your patch could amend them):
> 
> Cc: qemu-stable@nongnu.org
> Fixes: deba78709a ("accel/tcg: Always lock pages before translation")
My bad, added!