* [Qemu-devel] [PATCH v1 1/1] linux-user: Fix webkitgtk hangs on 32-bit x86 target
@ 2018-01-17 20:39 Alistair Francis
2018-01-17 20:54 ` Philippe Mathieu-Daudé
2018-01-18 0:57 ` Richard Henderson
0 siblings, 2 replies; 6+ messages in thread
From: Alistair Francis @ 2018-01-17 20:39 UTC (permalink / raw)
To: qemu-devel, rth, richard.henderson
Cc: peter.maydell, alistair.francis, alistair23, riku.voipio
Since commit "linux-user: Tidy and enforce reserved_va initialization"
(18e80c55bb6ec17c05ec0ba717ec83933c2bfc07) the Yocto webkitgtk build
hangs when cross compiling for 32-bit x86 on a 64-bit x86 machine using
musl.
To fix the issue reduce the MAX_RESERVED_VA macro to be a closer match
to what it was before the problematic commit.
Signed-off-by: Alistair Francis <alistair.francis@xilinx.com>
---
linux-user/main.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/linux-user/main.c b/linux-user/main.c
index 450eb3ce65..c7cc0a184e 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -77,7 +77,7 @@ do { \
(TARGET_LONG_BITS == 32 || defined(TARGET_ABI32))
/* There are a number of places where we assign reserved_va to a variable
of type abi_ulong and expect it to fit. Avoid the last page. */
-# define MAX_RESERVED_VA (0xfffffffful & TARGET_PAGE_MASK)
+# define MAX_RESERVED_VA (0x7ffffffful & TARGET_PAGE_MASK)
# else
# define MAX_RESERVED_VA (1ul << TARGET_VIRT_ADDR_SPACE_BITS)
# endif
--
2.14.1
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [Qemu-devel] [PATCH v1 1/1] linux-user: Fix webkitgtk hangs on 32-bit x86 target
2018-01-17 20:39 [Qemu-devel] [PATCH v1 1/1] linux-user: Fix webkitgtk hangs on 32-bit x86 target Alistair Francis
@ 2018-01-17 20:54 ` Philippe Mathieu-Daudé
2018-01-18 0:57 ` Richard Henderson
1 sibling, 0 replies; 6+ messages in thread
From: Philippe Mathieu-Daudé @ 2018-01-17 20:54 UTC (permalink / raw)
To: Alistair Francis, qemu-devel, rth, richard.henderson
Cc: peter.maydell, riku.voipio, alistair23
On 01/17/2018 05:39 PM, Alistair Francis wrote:
> Since commit "linux-user: Tidy and enforce reserved_va initialization"
> (18e80c55bb6ec17c05ec0ba717ec83933c2bfc07) the Yocto webkitgtk build
> hangs when cross compiling for 32-bit x86 on a 64-bit x86 machine using
> musl.
>
> To fix the issue reduce the MAX_RESERVED_VA macro to be a closer match
> to what it was before the problematic commit.
>
> Signed-off-by: Alistair Francis <alistair.francis@xilinx.com>
> ---
>
> linux-user/main.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/linux-user/main.c b/linux-user/main.c
> index 450eb3ce65..c7cc0a184e 100644
> --- a/linux-user/main.c
> +++ b/linux-user/main.c
> @@ -77,7 +77,7 @@ do { \
> (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32))
> /* There are a number of places where we assign reserved_va to a variable
> of type abi_ulong and expect it to fit. Avoid the last page. */
If this is only for MUSL shouldn't we think of smth like: ?
#if defined(__GLIBC__) || defined(__UCLIBC__)
> -# define MAX_RESERVED_VA (0xfffffffful & TARGET_PAGE_MASK)
#else /* __MUSL__ */
> +# define MAX_RESERVED_VA (0x7ffffffful & TARGET_PAGE_MASK)
#endif
> # else
> # define MAX_RESERVED_VA (1ul << TARGET_VIRT_ADDR_SPACE_BITS)
> # endif
>
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [Qemu-devel] [PATCH v1 1/1] linux-user: Fix webkitgtk hangs on 32-bit x86 target
2018-01-17 20:39 [Qemu-devel] [PATCH v1 1/1] linux-user: Fix webkitgtk hangs on 32-bit x86 target Alistair Francis
2018-01-17 20:54 ` Philippe Mathieu-Daudé
@ 2018-01-18 0:57 ` Richard Henderson
2018-01-18 5:46 ` Alistair Francis
1 sibling, 1 reply; 6+ messages in thread
From: Richard Henderson @ 2018-01-18 0:57 UTC (permalink / raw)
To: Alistair Francis, qemu-devel, richard.henderson
Cc: peter.maydell, alistair23, riku.voipio
On 01/17/2018 12:39 PM, Alistair Francis wrote:
> Since commit "linux-user: Tidy and enforce reserved_va initialization"
> (18e80c55bb6ec17c05ec0ba717ec83933c2bfc07) the Yocto webkitgtk build
> hangs when cross compiling for 32-bit x86 on a 64-bit x86 machine using
> musl.
>
> To fix the issue reduce the MAX_RESERVED_VA macro to be a closer match
> to what it was before the problematic commit.
>
> Signed-off-by: Alistair Francis <alistair.francis@xilinx.com>
> ---
I don't like this at all. You don't say why this hangs.
What is the actual host, x86_64 or i686?
r~
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Qemu-devel] [PATCH v1 1/1] linux-user: Fix webkitgtk hangs on 32-bit x86 target
2018-01-18 0:57 ` Richard Henderson
@ 2018-01-18 5:46 ` Alistair Francis
2018-01-19 0:08 ` Alistair Francis
0 siblings, 1 reply; 6+ messages in thread
From: Alistair Francis @ 2018-01-18 5:46 UTC (permalink / raw)
To: Richard Henderson
Cc: Alistair Francis, qemu-devel@nongnu.org Developers,
Richard Henderson, Peter Maydell, riku.voipio
On Wed, Jan 17, 2018 at 4:57 PM, Richard Henderson <rth@twiddle.net> wrote:
> On 01/17/2018 12:39 PM, Alistair Francis wrote:
>> Since commit "linux-user: Tidy and enforce reserved_va initialization"
>> (18e80c55bb6ec17c05ec0ba717ec83933c2bfc07) the Yocto webkitgtk build
>> hangs when cross compiling for 32-bit x86 on a 64-bit x86 machine using
>> musl.
>>
>> To fix the issue reduce the MAX_RESERVED_VA macro to be a closer match
>> to what it was before the problematic commit.
>>
>> Signed-off-by: Alistair Francis <alistair.francis@xilinx.com>
>> ---
>
> I don't like this at all. You don't say why this hangs.
> What is the actual host, x86_64 or i686?
The host is x86_64 and the guest is i686. I'm not sure why it hangs,
I'll dig through and get the actual command Yocto is running when it
hangs.
Alistair
>
>
> r~
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Qemu-devel] [PATCH v1 1/1] linux-user: Fix webkitgtk hangs on 32-bit x86 target
2018-01-18 5:46 ` Alistair Francis
@ 2018-01-19 0:08 ` Alistair Francis
2018-01-19 2:45 ` Richard Henderson
0 siblings, 1 reply; 6+ messages in thread
From: Alistair Francis @ 2018-01-19 0:08 UTC (permalink / raw)
To: Alistair Francis
Cc: Richard Henderson, qemu-devel@nongnu.org Developers,
Richard Henderson, Peter Maydell, riku.voipio
On Wed, Jan 17, 2018 at 9:46 PM, Alistair Francis
<alistair.francis@xilinx.com> wrote:
> On Wed, Jan 17, 2018 at 4:57 PM, Richard Henderson <rth@twiddle.net> wrote:
>> On 01/17/2018 12:39 PM, Alistair Francis wrote:
>>> Since commit "linux-user: Tidy and enforce reserved_va initialization"
>>> (18e80c55bb6ec17c05ec0ba717ec83933c2bfc07) the Yocto webkitgtk build
>>> hangs when cross compiling for 32-bit x86 on a 64-bit x86 machine using
>>> musl.
>>>
>>> To fix the issue reduce the MAX_RESERVED_VA macro to be a closer match
>>> to what it was before the problematic commit.
>>>
>>> Signed-off-by: Alistair Francis <alistair.francis@xilinx.com>
>>> ---
>>
>> I don't like this at all. You don't say why this hangs.
>> What is the actual host, x86_64 or i686?
>
> The host is x86_64 and the guest is i686. I'm not sure why it hangs,
> I'll dig through and get the actual command Yocto is running when it
> hangs.
Ok, this is not going to be straightforward at all.
The webkitgtk cmake command hangs when targeting i686 without this
patch. Somewhere in the Yocto build flow this causing some change
resulting in that hang. I don't know how to find out where the exact
problem is though.
It looks like only flipping the MSB to 0 fixes the issue, so maybe
there is a signed/unsigned issue somewhere? I'll keep digging.
Alistair
>
> Alistair
>
>>
>>
>> r~
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Qemu-devel] [PATCH v1 1/1] linux-user: Fix webkitgtk hangs on 32-bit x86 target
2018-01-19 0:08 ` Alistair Francis
@ 2018-01-19 2:45 ` Richard Henderson
0 siblings, 0 replies; 6+ messages in thread
From: Richard Henderson @ 2018-01-19 2:45 UTC (permalink / raw)
To: Alistair Francis
Cc: qemu-devel@nongnu.org Developers, Richard Henderson,
Peter Maydell, riku.voipio
On 01/18/2018 04:08 PM, Alistair Francis wrote:
> Ok, this is not going to be straightforward at all.
>
> The webkitgtk cmake command hangs when targeting i686 without this
> patch. Somewhere in the Yocto build flow this causing some change
> resulting in that hang. I don't know how to find out where the exact
> problem is though.
>
> It looks like only flipping the MSB to 0 fixes the issue, so maybe
> there is a signed/unsigned issue somewhere? I'll keep digging.
There shouldn't be. All of the variables involved on the x86_64 host should be
64-bit.
r~
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2018-01-19 2:45 UTC | newest]
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2018-01-17 20:39 [Qemu-devel] [PATCH v1 1/1] linux-user: Fix webkitgtk hangs on 32-bit x86 target Alistair Francis
2018-01-17 20:54 ` Philippe Mathieu-Daudé
2018-01-18 0:57 ` Richard Henderson
2018-01-18 5:46 ` Alistair Francis
2018-01-19 0:08 ` Alistair Francis
2018-01-19 2:45 ` Richard Henderson
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