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From: Paolo Bonzini <pbonzini@redhat.com>
To: qemu-devel@nongnu.org
Cc: Chenyi Qiang <chenyi.qiang@intel.com>
Subject: [PULL 26/29] target/i386: Add bus lock debug exception support
Date: Fri, 26 Feb 2021 09:05:23 +0100	[thread overview]
Message-ID: <20210226080526.651705-27-pbonzini@redhat.com> (raw)
In-Reply-To: <20210226080526.651705-1-pbonzini@redhat.com>

From: Chenyi Qiang <chenyi.qiang@intel.com>

Bus lock debug exception is a feature that can notify the kernel by
generate an #DB trap after the instruction acquires a bus lock when
CPL>0. This allows the kernel to enforce user application throttling or
mitigations.

This feature is enumerated via CPUID.(EAX=7,ECX=0).ECX[bit 24].

Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
Message-Id: <20210202090224.13274-1-chenyi.qiang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 target/i386/cpu.c | 2 +-
 target/i386/cpu.h | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index bc6956561a..50008431c3 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -963,7 +963,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
             "avx512bitalg", NULL, "avx512-vpopcntdq", NULL,
             "la57", NULL, NULL, NULL,
             NULL, NULL, "rdpid", NULL,
-            NULL, "cldemote", NULL, "movdiri",
+            "bus-lock-detect", "cldemote", NULL, "movdiri",
             "movdir64b", NULL, NULL, "pks",
         },
         .cpuid = {
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 8be39cfb62..b4b136cd0d 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -769,6 +769,8 @@ typedef uint64_t FeatureWordArray[FEATURE_WORDS];
 #define CPUID_7_0_ECX_LA57              (1U << 16)
 /* Read Processor ID */
 #define CPUID_7_0_ECX_RDPID             (1U << 22)
+/* Bus Lock Debug Exception */
+#define CPUID_7_0_ECX_BUS_LOCK_DETECT   (1U << 24)
 /* Cache Line Demote Instruction */
 #define CPUID_7_0_ECX_CLDEMOTE          (1U << 25)
 /* Move Doubleword as Direct Store Instruction */
-- 
2.29.2




  parent reply	other threads:[~2021-02-26  8:39 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-26  8:04 [PULL 00/29] Misc patches for 2021-02-25 Paolo Bonzini
2021-02-26  8:04 ` [PULL 01/29] hvf: Sign the code after installation Paolo Bonzini
2021-02-26  8:04 ` [PULL 02/29] configure: fix --enable-fuzzing linker failures Paolo Bonzini
2021-02-26  8:05 ` [PULL 03/29] multiprocess: move feature to meson_options.txt Paolo Bonzini
2021-02-26  8:05 ` [PULL 04/29] scsi: make io_timeout configurable Paolo Bonzini
2021-02-26  8:05 ` [PULL 05/29] scsi: add tracing for SG_IO commands Paolo Bonzini
2021-02-26  8:05 ` [PULL 06/29] scsi: allow user to set werror as report Paolo Bonzini
2021-02-26  8:05 ` [PULL 07/29] virtio-scsi: don't process IO on fenced dataplane Paolo Bonzini
2021-02-26  8:05 ` [PULL 08/29] scsi-disk: move scsi_handle_rw_error earlier Paolo Bonzini
2021-02-26  8:05 ` [PULL 09/29] scsi-disk: do not complete requests early for rerror/werror=ignore Paolo Bonzini
2021-02-26  8:05 ` [PULL 10/29] scsi: introduce scsi_sense_from_errno() Paolo Bonzini
2021-02-26  8:05 ` [PULL 11/29] scsi-disk: pass SCSI status to scsi_handle_rw_error Paolo Bonzini
2021-02-26  8:05 ` [PULL 12/29] scsi-disk: pass guest recoverable errors through even for rerror=stop Paolo Bonzini
2021-02-26  8:05 ` [PULL 13/29] scsi: drop 'result' argument from command_complete callback Paolo Bonzini
2021-02-26  8:05 ` [PULL 14/29] char: don't fail when client is not connected Paolo Bonzini
2021-02-26  8:05 ` [PULL 15/29] gdbstub: use preferred boolean option syntax Paolo Bonzini
2021-02-26  8:05 ` [PULL 16/29] qemu-options: update to show preferred boolean syntax for -chardev Paolo Bonzini
2021-02-26  8:05 ` [PULL 17/29] qemu-options: update to show preferred boolean syntax for -spice Paolo Bonzini
2021-02-26  8:05 ` [PULL 18/29] qemu-options: update to show preferred boolean syntax for -netdev Paolo Bonzini
2021-02-26  8:05 ` [PULL 19/29] qemu-options: update to show preferred boolean syntax for -incoming Paolo Bonzini
2021-02-26  8:05 ` [PULL 20/29] qemu-options: update to show preferred boolean syntax for -vnc Paolo Bonzini
2021-02-26  8:05 ` [PULL 21/29] docs: update to show preferred boolean syntax for -chardev Paolo Bonzini
2021-02-26  8:05 ` [PULL 22/29] docs: update to show preferred boolean syntax for -vnc Paolo Bonzini
2021-02-26  8:05 ` [PULL 23/29] docs: update to show preferred boolean syntax for -cpu Paolo Bonzini
2021-02-26  8:05 ` [PULL 24/29] target/i386: " Paolo Bonzini
2021-02-26  8:05 ` [PULL 25/29] qom/object.c: Fix typo Paolo Bonzini
2021-02-26  8:05 ` Paolo Bonzini [this message]
2021-02-26  8:05 ` [PULL 27/29] vl: deprecate -writeconfig Paolo Bonzini
2021-03-01  8:00   ` Markus Armbruster
2021-03-01 10:09     ` Paolo Bonzini
2021-03-01 13:26       ` Markus Armbruster
2021-03-01 13:45         ` Paolo Bonzini
2021-03-01 14:54           ` Markus Armbruster
2021-03-01 15:05             ` Paolo Bonzini
2021-03-01 16:03   ` About '-readconfig' [Was: Re: [PULL 27/29] vl: deprecate -writeconfig] Kashyap Chamarthy
2021-03-01 16:24     ` Paolo Bonzini
2021-03-02 15:36       ` Kashyap Chamarthy
2021-02-26  8:05 ` [PULL 28/29] chardev: do not use short form boolean options in non-QemuOpts character device descriptions Paolo Bonzini
2021-02-26  8:05 ` [PULL 29/29] tcg/i386: rdpmc: fix the the condtions Paolo Bonzini
2021-02-26  8:51 ` [PULL 00/29] Misc patches for 2021-02-25 no-reply
2021-03-03 16:54 ` Peter Maydell

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