* Re: Can VMX provide real mode support? [not found] <CABurPedHNnAewUhiZ8L4JiwRn_2g2Sq=F+GSi8qE2YKqLCRqHg@mail.gmail.com> @ 2012-03-21 13:40 ` Jan Kiszka 2012-03-21 13:48 ` Avi Kivity 0 siblings, 1 reply; 6+ messages in thread From: Jan Kiszka @ 2012-03-21 13:40 UTC (permalink / raw) To: GaoYi; +Cc: qemu-devel@nongnu.org, kvm On 2012-03-21 13:38, GaoYi wrote: > Hi Jan, > > Since the newest Intel-VT supports the guest OS under the real mode, which was already supported in AMD-V, can the VMX in the latest KVM support that case? Yes, both with our without that "unrestricted guest" support (as Intel called it), real mode will generally work. Without that CPU feature, I think to recall that there were some limitations for big real mode, not sure. Jan -- Siemens AG, Corporate Technology, CT T DE IT 1 Corporate Competence Center Embedded Linux ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Can VMX provide real mode support? 2012-03-21 13:40 ` Can VMX provide real mode support? Jan Kiszka @ 2012-03-21 13:48 ` Avi Kivity 2012-03-21 13:56 ` GaoYi 2012-03-23 17:58 ` [Qemu-devel] " Luiz Capitulino 0 siblings, 2 replies; 6+ messages in thread From: Avi Kivity @ 2012-03-21 13:48 UTC (permalink / raw) To: Jan Kiszka; +Cc: GaoYi, qemu-devel@nongnu.org, kvm On 03/21/2012 03:40 PM, Jan Kiszka wrote: > On 2012-03-21 13:38, GaoYi wrote: > > Hi Jan, > > > > Since the newest Intel-VT supports the guest OS under the real mode, which was already supported in AMD-V, can the VMX in the latest KVM support that case? > > Yes, both with our without that "unrestricted guest" support (as Intel > called it), real mode will generally work. Without that CPU feature, I > think to recall that there were some limitations for big real mode, not > sure. > Yes, big real mode will not work without "unrestricted guest". There was some work to emulate it (module option emulate_invalid_guest_state), but it is not complete. -- error compiling committee.c: too many arguments to function ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Can VMX provide real mode support? 2012-03-21 13:48 ` Avi Kivity @ 2012-03-21 13:56 ` GaoYi 2012-03-23 17:58 ` [Qemu-devel] " Luiz Capitulino 1 sibling, 0 replies; 6+ messages in thread From: GaoYi @ 2012-03-21 13:56 UTC (permalink / raw) To: Avi Kivity; +Cc: Jan Kiszka, qemu-devel@nongnu.org, kvm [-- Attachment #1: Type: text/plain, Size: 1083 bytes --] Hi, Thanks for your prompt response. So if the CPU supports the real mode, the KVM can support the real mode guest and there is still work to be done for CPU without real mode support, namely software emulation? Again 在 2012年3月21日 下午9:48，Avi Kivity <avi@redhat.com>写道： > On 03/21/2012 03:40 PM, Jan Kiszka wrote: > > On 2012-03-21 13:38, GaoYi wrote: > > > Hi Jan, > > > > > > Since the newest Intel-VT supports the guest OS under the real > mode, which was already supported in AMD-V, can the VMX in the latest KVM > support that case? > > > > Yes, both with our without that "unrestricted guest" support (as Intel > > called it), real mode will generally work. Without that CPU feature, I > > think to recall that there were some limitations for big real mode, not > > sure. > > > > Yes, big real mode will not work without "unrestricted guest". There > was some work to emulate it (module option emulate_invalid_guest_state), > but it is not complete. > > -- > error compiling committee.c: too many arguments to function > > [-- Attachment #2: Type: text/html, Size: 1550 bytes --] ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Qemu-devel] Can VMX provide real mode support? 2012-03-21 13:48 ` Avi Kivity 2012-03-21 13:56 ` GaoYi @ 2012-03-23 17:58 ` Luiz Capitulino 2012-03-25 9:55 ` Avi Kivity 1 sibling, 1 reply; 6+ messages in thread From: Luiz Capitulino @ 2012-03-23 17:58 UTC (permalink / raw) To: Avi Kivity; +Cc: Jan Kiszka, GaoYi, qemu-devel@nongnu.org, kvm On Wed, 21 Mar 2012 15:48:43 +0200 Avi Kivity <avi@redhat.com> wrote: > On 03/21/2012 03:40 PM, Jan Kiszka wrote: > > On 2012-03-21 13:38, GaoYi wrote: > > > Hi Jan, > > > > > > Since the newest Intel-VT supports the guest OS under the real mode, which was already supported in AMD-V, can the VMX in the latest KVM support that case? > > > > Yes, both with our without that "unrestricted guest" support (as Intel > > called it), real mode will generally work. Without that CPU feature, I > > think to recall that there were some limitations for big real mode, not > > sure. > > > > Yes, big real mode will not work without "unrestricted guest". There > was some work to emulate it (module option emulate_invalid_guest_state), > but it is not complete. Can you provide a pointer for this? series? ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Qemu-devel] Can VMX provide real mode support? 2012-03-23 17:58 ` [Qemu-devel] " Luiz Capitulino @ 2012-03-25 9:55 ` Avi Kivity 2012-03-25 11:42 ` GaoYi 0 siblings, 1 reply; 6+ messages in thread From: Avi Kivity @ 2012-03-25 9:55 UTC (permalink / raw) To: Luiz Capitulino; +Cc: Jan Kiszka, GaoYi, qemu-devel@nongnu.org, kvm On 03/23/2012 07:58 PM, Luiz Capitulino wrote: > On Wed, 21 Mar 2012 15:48:43 +0200 > Avi Kivity <avi@redhat.com> wrote: > > > On 03/21/2012 03:40 PM, Jan Kiszka wrote: > > > On 2012-03-21 13:38, GaoYi wrote: > > > > Hi Jan, > > > > > > > > Since the newest Intel-VT supports the guest OS under the real mode, which was already supported in AMD-V, can the VMX in the latest KVM support that case? > > > > > > Yes, both with our without that "unrestricted guest" support (as Intel > > > called it), real mode will generally work. Without that CPU feature, I > > > think to recall that there were some limitations for big real mode, not > > > sure. > > > > > > > Yes, big real mode will not work without "unrestricted guest". There > > was some work to emulate it (module option emulate_invalid_guest_state), > > but it is not complete. > > Can you provide a pointer for this? series? It's merged (look for emulate_invalid_guest_state in vmx.c), just incomplete. -- error compiling committee.c: too many arguments to function ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Can VMX provide real mode support? 2012-03-25 9:55 ` Avi Kivity @ 2012-03-25 11:42 ` GaoYi 0 siblings, 0 replies; 6+ messages in thread From: GaoYi @ 2012-03-25 11:42 UTC (permalink / raw) To: Avi Kivity; +Cc: Jan Kiszka, qemu-devel@nongnu.org, kvm, Luiz Capitulino [-- Attachment #1: Type: text/plain, Size: 1283 bytes --] So if the VT already supports unrestricted guest, KVM can then runs such guest? 在 2012年3月25日 下午5:55，Avi Kivity <avi@redhat.com>写道： > On 03/23/2012 07:58 PM, Luiz Capitulino wrote: > > On Wed, 21 Mar 2012 15:48:43 +0200 > > Avi Kivity <avi@redhat.com> wrote: > > > > > On 03/21/2012 03:40 PM, Jan Kiszka wrote: > > > > On 2012-03-21 13:38, GaoYi wrote: > > > > > Hi Jan, > > > > > > > > > > Since the newest Intel-VT supports the guest OS under the real > mode, which was already supported in AMD-V, can the VMX in the latest KVM > support that case? > > > > > > > > Yes, both with our without that "unrestricted guest" support (as > Intel > > > > called it), real mode will generally work. Without that CPU feature, > I > > > > think to recall that there were some limitations for big real mode, > not > > > > sure. > > > > > > > > > > Yes, big real mode will not work without "unrestricted guest". There > > > was some work to emulate it (module option > emulate_invalid_guest_state), > > > but it is not complete. > > > > Can you provide a pointer for this? series? > > It's merged (look for emulate_invalid_guest_state in vmx.c), just > incomplete. > > -- > error compiling committee.c: too many arguments to function > > [-- Attachment #2: Type: text/html, Size: 1832 bytes --] ^ permalink raw reply [flat|nested] 6+ messages in thread
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[not found] <CABurPedHNnAewUhiZ8L4JiwRn_2g2Sq=F+GSi8qE2YKqLCRqHg@mail.gmail.com>
2012-03-21 13:40 ` Can VMX provide real mode support? Jan Kiszka
2012-03-21 13:48 ` Avi Kivity
2012-03-21 13:56 ` GaoYi
2012-03-23 17:58 ` [Qemu-devel] " Luiz Capitulino
2012-03-25 9:55 ` Avi Kivity
2012-03-25 11:42 ` GaoYi
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