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Date: Tue, 22 May 2012 08:31:10 +0300 From: Gleb Natapov <gleb@...hat.com> To: Marcelo Tosatti <mtosatti@...hat.com> Cc: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>, Avi Kivity <avi@...hat.com>, LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org> Subject: Re: [PATCH] KVM: fix async page fault working for readonly mapping On Mon, May 21, 2012 at 04:30:41PM -0300, Marcelo Tosatti wrote: > On Mon, May 21, 2012 at 04:15:50PM +0800, Xiao Guangrong wrote: > > On 05/21/2012 04:08 PM, Gleb Natapov wrote: > > > > > On Mon, May 21, 2012 at 02:45:45PM +0800, Xiao Guangrong wrote: > > >> If we map a readonly memory space from host to guest and the page is > > >> not currently mapped in the host, we will get a fault-pfn and async > > >> is not allowed, then the vm will crash > > >> > > > Why would we want to map a readonly memory space from host to guest? > > > We may want to do it to support memory semantics on read and mmio on > > > write, but do not right now unless something changed while I was not > > > looking. > > > > > > Some test cases in kvm-unit-tests and the benchmark i am writing for KVM > > need map the function on host to guest. > > Or ROM. Or read-only mappings of IVSHMEM (which don't exist yet). True. KVM should ignore writes to such areas, not kill a guest. Is this how the code works today? -- Gleb. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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