From: Jan Beulich <JBeulich@suse.com>
To: Paul Durrant <Paul.Durrant@citrix.com>,
"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Cc: Andrew Cooper <Andrew.Cooper3@citrix.com>, Wei Liu <wl@xen.org>,
Roger Pau Monne <roger.pau@citrix.com>
Subject: Re: [Xen-devel] [PATCH 1/6] x86emul: generalize wbinvd() hook
Date: Tue, 2 Jul 2019 10:50:02 +0000 [thread overview]
Message-ID: <106174e9-de40-d41f-94d3-baaf74cd8d7d@suse.com> (raw)
In-Reply-To: <66a6b048ef29468c87138e55eeb68e10@AMSPEX02CL03.citrite.net>
On 02.07.2019 12:22, Paul Durrant wrote:
>> From: Jan Beulich <JBeulich@suse.com>
>> Sent: 01 July 2019 12:56
>>
>> @@ -2149,10 +2147,65 @@ static int hvmemul_write_msr(
>> return rc;
>> }
>>
>> -static int hvmemul_wbinvd(
>> +static int hvmemul_cache_op(
>> + enum x86emul_cache_op op,
>> + enum x86_segment seg,
>> + unsigned long offset,
>> struct x86_emulate_ctxt *ctxt)
>> {
>> - alternative_vcall(hvm_funcs.wbinvd_intercept);
>> + struct hvm_emulate_ctxt *hvmemul_ctxt =
>> + container_of(ctxt, struct hvm_emulate_ctxt, ctxt);
>> + unsigned long addr, reps = 1;
>> + uint32_t pfec = PFEC_page_present;
>> + int rc;
>> + void *mapping;
>> +
>> + if ( !cache_flush_permitted(current->domain) )
>> + return X86EMUL_OKAY;
>> +
>> + switch ( op )
>> + {
>> + case x86emul_clflush:
>> + case x86emul_clflushopt:
>> + case x86emul_clwb:
>> + ASSERT(!is_x86_system_segment(seg));
>> +
>> + rc = hvmemul_virtual_to_linear(seg, offset, 0, &reps,
>> + hvm_access_read, hvmemul_ctxt, &addr);
>> + if ( rc != X86EMUL_OKAY )
>> + break;
>> +
>> + if ( hvmemul_ctxt->seg_reg[x86_seg_ss].dpl == 3 )
>> + pfec |= PFEC_user_mode;
>> +
>> + mapping = hvmemul_map_linear_addr(addr, 0, pfec, hvmemul_ctxt,
>> + current->arch.hvm.data_cache);
>> + if ( mapping == ERR_PTR(~X86EMUL_EXCEPTION) )
>> + return X86EMUL_EXCEPTION;
This return ...
>> + if ( IS_ERR_OR_NULL(mapping) )
>> + break;
>> +
>> + if ( cpu_has_clflush )
>> + {
>> + if ( op == x86emul_clwb && cpu_has_clwb )
>> + clwb(mapping);
>> + else if ( op == x86emul_clflushopt && cpu_has_clflushopt )
>> + clflushopt(mapping);
>> + else
>> + clflush(mapping);
>> +
>> + hvmemul_unmap_linear_addr(mapping, addr, 0, hvmemul_ctxt);
>> + break;
>> + }
>> +
>> + hvmemul_unmap_linear_addr(mapping, addr, 0, hvmemul_ctxt);
>
> Since the mapping is ditched here, why bother getting one at all in the
> !cpu_has_clflush case? Are you trying to flush out an error condition> that was previously missed?
... is what I'm after: We want exception behavior to be correct.
Jan
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next prev parent reply other threads:[~2019-07-02 10:52 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-01 11:47 [Xen-devel] [PATCH 0/6] x86emul: further work Jan Beulich
2019-07-01 11:56 ` [Xen-devel] [PATCH 1/6] x86emul: generalize wbinvd() hook Jan Beulich
2019-07-02 10:22 ` Paul Durrant
2019-07-02 10:50 ` Jan Beulich [this message]
2019-07-02 10:53 ` Paul Durrant
2019-08-27 10:44 ` Andrew Cooper
2019-08-27 12:51 ` Andrew Cooper
2019-08-27 18:47 ` Andrew Cooper
2019-09-02 11:10 ` [Xen-devel] Ping: " Jan Beulich
2019-09-02 12:04 ` Paul Durrant
2019-07-01 11:56 ` [Xen-devel] [PATCH 2/6] x86emul: support WBNOINVD Jan Beulich
2019-07-02 10:38 ` Paul Durrant
2019-08-27 14:47 ` Andrew Cooper
2019-08-27 15:08 ` Jan Beulich
2019-08-27 16:45 ` Andrew Cooper
2019-08-28 11:42 ` Andrew Cooper
2019-07-01 11:56 ` [Xen-devel] [PATCH 3/6] x86emul: generalize invlpg() hook Jan Beulich
2019-07-02 10:47 ` Paul Durrant
2019-08-27 14:55 ` Andrew Cooper
2019-07-01 11:57 ` [Xen-devel] [PATCH 4/6] x86: move INVPCID_TYPE_* to x86-defns.h Jan Beulich
2019-07-02 10:49 ` Paul Durrant
2019-08-27 14:57 ` Andrew Cooper
2019-07-01 11:57 ` [Xen-devel] [PATCH 5/6] x86emul: support INVPCID Jan Beulich
2019-07-02 12:54 ` Paul Durrant
2019-08-27 15:31 ` Andrew Cooper
2019-08-27 15:53 ` Jan Beulich
2019-08-27 17:27 ` Andrew Cooper
2019-08-28 7:14 ` Jan Beulich
2019-08-28 11:33 ` Andrew Cooper
2019-07-01 11:58 ` [Xen-devel] [PATCH 6/6] x86emul: support MOVDIR{I,64B} insns Jan Beulich
2019-08-27 16:04 ` Andrew Cooper
2019-08-28 6:26 ` Jan Beulich
2019-08-28 11:51 ` Andrew Cooper
2019-08-28 12:19 ` Jan Beulich
2019-08-15 14:24 ` [Xen-devel] [PATCH 0/6] x86emul: further work Andrew Cooper
2019-08-27 8:37 ` Jan Beulich
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