From: Gleb Natapov <gleb@redhat.com>
To: Avi Kivity <avi@redhat.com>
Cc: mtosatti@redhat.com, kvm@vger.kernel.org
Subject: Re: [PATCH v2 28/30] KVM: x86 emulator: restart string instruction without going back to a guest.
Date: Mon, 15 Mar 2010 12:19:56 +0200 [thread overview]
Message-ID: <20100315101956.GI4294@redhat.com> (raw)
In-Reply-To: <4B9E08BA.7090303@redhat.com>
On Mon, Mar 15, 2010 at 12:15:22PM +0200, Avi Kivity wrote:
> On 03/15/2010 12:07 PM, Gleb Natapov wrote:
> >
> >>Or we can make the buffer larger for everyone (outside this patchset
> >>though).
> >>
> >I am not sure what do you mean here. INS read ahead and MMIO read cache are
> >different beasts. Former is needed to speed-up string pio reads, later
> >(not yet implemented) is needed to reread previous MMIO read results in
> >case instruction emulation is restarted due to need to exit to userspace.
> >MMIO read cache need to be invalidated on each iteration of string
> >instruction.
>
> Instructions with multiple reads or writes need an mmio read/write
> buffer that can be replayed on re-execution.
>
> buffer != cache! A cache can be dropped (perhaps after flushing it
> to a backing store), but a buffer in general cannot.
>
That is just naming. Call it "buffer" if you want.
I still don't understand what do you mean by "Or we can make the buffer
larger for everyone". Who is this "everyone"? Different instruction need
different kind of buffers.
--
Gleb.
next prev parent reply other threads:[~2010-03-15 10:19 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-14 16:20 [PATCH v2 00/30] emulator cleanup Gleb Natapov
2010-03-14 16:20 ` [PATCH v2 01/30] KVM: x86 emulator: Fix DstAcc decoding Gleb Natapov
2010-03-14 16:20 ` [PATCH v2 02/30] KVM: x86 emulator: fix RCX access during rep emulation Gleb Natapov
2010-03-14 16:20 ` [PATCH v2 03/30] KVM: x86 emulator: check return value against correct define Gleb Natapov
2010-03-14 16:20 ` [PATCH v2 04/30] KVM: Remove pointer to rflags from realmode_set_cr parameters Gleb Natapov
2010-03-14 16:20 ` [PATCH v2 05/30] KVM: Provide callback to get/set control registers in emulator ops Gleb Natapov
2010-03-15 13:06 ` Andre Przywara
2010-03-15 13:11 ` Gleb Natapov
2010-03-15 13:13 ` Avi Kivity
2010-03-14 16:20 ` [PATCH v2 06/30] KVM: remove realmode_lmsw function Gleb Natapov
2010-03-15 11:02 ` Andre Przywara
2010-03-15 11:41 ` Avi Kivity
2010-03-14 16:20 ` [PATCH v2 07/30] KVM: Provide x86_emulate_ctxt callback to get current cpl Gleb Natapov
2010-03-15 13:16 ` Andre Przywara
2010-03-15 13:21 ` Gleb Natapov
2010-03-14 16:20 ` [PATCH v2 08/30] KVM: Provide current eip as part of emulator context Gleb Natapov
2010-03-14 16:20 ` [PATCH v2 09/30] KVM: x86 emulator: fix mov r/m, sreg emulation Gleb Natapov
2010-03-14 16:20 ` [PATCH v2 10/30] KVM: x86 emulator: fix 0f 01 /5 emulation Gleb Natapov
2010-03-14 16:20 ` [PATCH v2 11/30] KVM: x86 emulator: 0f (20|21|22|23) ignore mod bits Gleb Natapov
2010-03-14 16:20 ` [PATCH v2 12/30] KVM: x86 emulator: inject #UD on access to non-existing CR Gleb Natapov
2010-03-14 16:20 ` [PATCH v2 13/30] KVM: x86 emulator: fix mov dr to inject #UD when needed Gleb Natapov
2010-03-14 16:20 ` [PATCH v2 14/30] KVM: x86 emulator: fix return values of syscall/sysenter/sysexit emulations Gleb Natapov
2010-03-14 16:21 ` [PATCH v2 15/30] KVM: x86 emulator: do not call writeback if msr access fails Gleb Natapov
2010-03-14 16:21 ` [PATCH v2 16/30] KVM: x86 emulator: If LOCK prefix is used dest arg should be memory Gleb Natapov
2010-03-14 16:21 ` [PATCH v2 17/30] KVM: x86 emulator: cleanup grp3 return value Gleb Natapov
2010-03-14 16:21 ` [PATCH v2 18/30] KVM: x86 emulator: Provide more callbacks for x86 emulator Gleb Natapov
2010-03-14 16:21 ` [PATCH v2 19/30] KVM: x86 emulator: Emulate task switch in emulator.c Gleb Natapov
2010-03-14 16:21 ` [PATCH v2 20/30] KVM: x86 emulator: Use load_segment_descriptor() instead of kvm_load_segment_descriptor() Gleb Natapov
2010-03-14 16:21 ` [PATCH v2 21/30] KVM: Use task switch from emulator.c Gleb Natapov
2010-03-14 16:21 ` [PATCH v2 22/30] KVM: x86 emulator: populate OP_MEM operand during decoding Gleb Natapov
2010-03-14 16:21 ` [PATCH v2 23/30] KVM: x86 emulator: add decoding of X,Y parameters from Intel SDM Gleb Natapov
2010-03-14 16:21 ` [PATCH v2 24/30] KVM: x86 emulator: during rep emulation decrement ECX only if emulation succeeded Gleb Natapov
2010-03-14 16:42 ` Avi Kivity
2010-03-14 16:21 ` [PATCH v2 25/30] KVM: x86 emulator: fix in/out emulation Gleb Natapov
2010-03-14 16:54 ` Avi Kivity
2010-03-14 17:35 ` Gleb Natapov
2010-03-15 7:41 ` Avi Kivity
2010-03-15 7:44 ` Gleb Natapov
2010-03-14 16:21 ` [PATCH v2 26/30] KVM: x86 emulator: Move string pio emulation into emulator.c Gleb Natapov
2010-03-14 16:21 ` [PATCH v2 27/30] KVM: x86 emulator: remove saved_eip Gleb Natapov
2010-03-14 16:21 ` [PATCH v2 28/30] KVM: x86 emulator: restart string instruction without going back to a guest Gleb Natapov
2010-03-14 16:56 ` Avi Kivity
2010-03-14 18:06 ` Gleb Natapov
2010-03-15 7:44 ` Avi Kivity
2010-03-15 9:44 ` Gleb Natapov
2010-03-15 9:56 ` Avi Kivity
2010-03-15 10:07 ` Gleb Natapov
2010-03-15 10:15 ` Avi Kivity
2010-03-15 10:19 ` Gleb Natapov [this message]
2010-03-15 10:24 ` Avi Kivity
2010-03-15 10:33 ` Gleb Natapov
2010-03-14 16:21 ` [PATCH v2 29/30] KVM: x86 emulator: introduce pio in string read ahead Gleb Natapov
2010-03-14 16:21 ` [PATCH v2 30/30] KVM: small kvm_arch_vcpu_ioctl_run() cleanup Gleb Natapov
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