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Groups > linux.kernel > #1273704 > unrolled thread
| Started by | Wanpeng Li <kernellwp@gmail.com> |
|---|---|
| First post | 2015-11-20 04:00 +0100 |
| Last post | 2015-11-20 08:50 +0100 |
| Articles | 3 — 2 participants |
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Re: [PATCH] KVM: x86: emulate: correct page fault error code for NoWrite instructions Wanpeng Li <kernellwp@gmail.com> - 2015-11-20 04:00 +0100
Re: [PATCH] KVM: x86: emulate: correct page fault error code for NoWrite instructions Wanpeng Li <kernellwp@gmail.com> - 2015-11-20 04:30 +0100
Re: [PATCH] KVM: x86: emulate: correct page fault error code for NoWrite instructions Nadav Amit <nadav.amit@gmail.com> - 2015-11-20 08:50 +0100
| From | Wanpeng Li <kernellwp@gmail.com> |
|---|---|
| Date | 2015-11-20 04:00 +0100 |
| Subject | Re: [PATCH] KVM: x86: emulate: correct page fault error code for NoWrite instructions |
| Message-ID | <qwK5z-1aE-5@gated-at.bofh.it> |
Hi Paolo, 2015-02-09 17:03 GMT+08:00 Paolo Bonzini <pbonzini@redhat.com>: > NoWrite instructions (e.g. cmp or test) never set the "write access" > bit in the error code, even if one of the operands is treated as a > destination. Sorry to reply to an old commit, btw, could you point out where in SDM describe above? Regards, Wanpeng Li -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | Wanpeng Li <kernellwp@gmail.com> |
|---|---|
| Date | 2015-11-20 04:30 +0100 |
| Message-ID | <qwKyC-1Hg-3@gated-at.bofh.it> |
| In reply to | #1273704 |
2015-11-20 10:52 GMT+08:00 Wanpeng Li <kernellwp@gmail.com>: > Hi Paolo, > 2015-02-09 17:03 GMT+08:00 Paolo Bonzini <pbonzini@redhat.com>: >> NoWrite instructions (e.g. cmp or test) never set the "write access" >> bit in the error code, even if one of the operands is treated as a >> destination. > > Sorry to reply to an old commit, btw, could you point out where in SDM > describe above? I see. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | Nadav Amit <nadav.amit@gmail.com> |
|---|---|
| Date | 2015-11-20 08:50 +0100 |
| Subject | Re: [PATCH] KVM: x86: emulate: correct page fault error code for NoWrite instructions |
| Message-ID | <qwOCd-4dZ-5@gated-at.bofh.it> |
| In reply to | #1273713 |
Wanpeng Li <kernellwp@gmail.com> wrote: > 2015-11-20 10:52 GMT+08:00 Wanpeng Li <kernellwp@gmail.com>: >> Hi Paolo, >> 2015-02-09 17:03 GMT+08:00 Paolo Bonzini <pbonzini@redhat.com>: >>> NoWrite instructions (e.g. cmp or test) never set the "write access" >>> bit in the error code, even if one of the operands is treated as a >>> destination. >> >> Sorry to reply to an old commit, btw, could you point out where in SDM >> describe above? > > I see. I don’t understand whether you still need my help, so to clarify: on a page-fault the error code should indicate whether the access was due to a write access. Previously KVM marked it as “write access” for instructions such as test and cmp that do not perform write. Nadav-- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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