From: "Tian, Kevin" <kevin.tian@intel.com>
To: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: "iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>,
Joerg Roedel <joro@8bytes.org>,
"David Woodhouse" <dwmw2@infradead.org>,
Alex Williamson <alex.williamson@redhat.com>,
Jean-Philippe Brucker <jean-philippe@linaro.com>,
"Liu, Yi L" <yi.l.liu@intel.com>,
"Raj, Ashok" <ashok.raj@intel.com>,
Christoph Hellwig <hch@infradead.org>,
Lu Baolu <baolu.lu@linux.intel.com>,
Jonathan Cameron <jic23@kernel.org>,
Eric Auger <eric.auger@redhat.com>
Subject: RE: [PATCH v7 02/11] iommu/vt-d: Enlightened PASID allocation
Date: Tue, 29 Oct 2019 18:16:40 +0000 [thread overview]
Message-ID: <AADFC41AFE54684AB9EE6CBC0274A5D19D5DEE2B@SHSMSX104.ccr.corp.intel.com> (raw)
In-Reply-To: <20191029101436.3ca8d438@jacob-builder>
> From: Jacob Pan [mailto:jacob.jun.pan@linux.intel.com]
> Sent: Wednesday, October 30, 2019 1:15 AM
> > >
> > > From: Lu Baolu <baolu.lu@linux.intel.com>
> > >
> > > Enabling IOMMU in a guest requires communication with the host
> > > driver for certain aspects. Use of PASID ID to enable Shared Virtual
> > > Addressing (SVA) requires managing PASID's in the host. VT-d 3.0
> > > spec provides a Virtual Command Register (VCMD) to facilitate this.
> > > Writes to this register in the guest are trapped by QEMU which
> > > proxies the call to the host driver.
> > >
> > > This virtual command interface consists of a capability register,
> > > a virtual command register, and a virtual response register. Refer
> > > to section 10.4.42, 10.4.43, 10.4.44 for more information.
> > >
> > > This patch adds the enlightened PASID allocation/free interfaces
> > > via the virtual command interface.
> > >
> > > Cc: Ashok Raj <ashok.raj@intel.com>
> > > Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
> > > Cc: Kevin Tian <kevin.tian@intel.com>
> > > Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
> > > Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
> > > Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
> > > Reviewed-by: Eric Auger <eric.auger@redhat.com>
> > > ---
> > > drivers/iommu/intel-pasid.c | 56
> > > +++++++++++++++++++++++++++++++++++++++++++++
> > > drivers/iommu/intel-pasid.h | 13 ++++++++++-
> > > include/linux/intel-iommu.h | 2 ++
> > > 3 files changed, 70 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/iommu/intel-pasid.c
> > > b/drivers/iommu/intel-pasid.c index 040a445be300..d81e857d2b25
> > > 100644 --- a/drivers/iommu/intel-pasid.c
> > > +++ b/drivers/iommu/intel-pasid.c
> > > @@ -63,6 +63,62 @@ void *intel_pasid_lookup_id(int pasid)
> > > return p;
> > > }
> > >
> > > +int vcmd_alloc_pasid(struct intel_iommu *iommu, unsigned int
> > > *pasid) +{
> > > + unsigned long flags;
> > > + u8 status_code;
> > > + int ret = 0;
> > > + u64 res;
> > > +
> > > + raw_spin_lock_irqsave(&iommu->register_lock, flags);
> > > + dmar_writeq(iommu->reg + DMAR_VCMD_REG,
> > > VCMD_CMD_ALLOC);
> > > + IOMMU_WAIT_OP(iommu, DMAR_VCRSP_REG, dmar_readq,
> > > + !(res & VCMD_VRSP_IP), res);
> > > + raw_spin_unlock_irqrestore(&iommu->register_lock, flags);
> > > +
> >
> > should we handle VCMD_VRSP_IP here?
> VCMD_VRSP_IP is checked above, if it times out, you will get panic. Not
> sure whatelse to do?
Not need. I misunderstood the condition here.
> >
> > > + status_code = VCMD_VRSP_SC(res);
> > > + switch (status_code) {
> > > + case VCMD_VRSP_SC_SUCCESS:
> > > + *pasid = VCMD_VRSP_RESULT(res);
> > > + break;
> > > + case VCMD_VRSP_SC_NO_PASID_AVAIL:
> > > + pr_info("IOMMU: %s: No PASID available\n", iommu-
> > > >name);
> > > + ret = -ENOMEM;
> > > + break;
> > > + default:
> > > + ret = -ENODEV;
> > > + pr_warn("IOMMU: %s: Unexpected error code %d\n",
> > > + iommu->name, status_code);
> > > + }
> > > +
> > > + return ret;
> > > +}
> > > +
> > > +void vcmd_free_pasid(struct intel_iommu *iommu, unsigned int pasid)
> > > +{
> > > + unsigned long flags;
> > > + u8 status_code;
> > > + u64 res;
> > > +
> > > + raw_spin_lock_irqsave(&iommu->register_lock, flags);
> > > + dmar_writeq(iommu->reg + DMAR_VCMD_REG, (pasid << 8) |
> > > VCMD_CMD_FREE);
> >
> > define a macro for pasid offset.
> >
> will do.
>
> > > + IOMMU_WAIT_OP(iommu, DMAR_VCRSP_REG, dmar_readq,
> > > + !(res & VCMD_VRSP_IP), res);
> > > + raw_spin_unlock_irqrestore(&iommu->register_lock, flags);
> > > +
> > > + status_code = VCMD_VRSP_SC(res);
> > > + switch (status_code) {
> > > + case VCMD_VRSP_SC_SUCCESS:
> > > + break;
> > > + case VCMD_VRSP_SC_INVALID_PASID:
> > > + pr_info("IOMMU: %s: Invalid PASID\n", iommu->name);
> > > + break;
> > > + default:
> > > + pr_warn("IOMMU: %s: Unexpected error code %d\n",
> > > + iommu->name, status_code);
> > > + }
> > > +}
> > > +
> > > /*
> > > * Per device pasid table management:
> > > */
> > > diff --git a/drivers/iommu/intel-pasid.h
> > > b/drivers/iommu/intel-pasid.h index fc8cd8f17de1..e413e884e685
> > > 100644 --- a/drivers/iommu/intel-pasid.h
> > > +++ b/drivers/iommu/intel-pasid.h
> > > @@ -23,6 +23,16 @@
> > > #define is_pasid_enabled(entry) (((entry)->lo >> 3)
> > > & 0x1) #define get_pasid_dir_size(entry) (1 <<
> > > ((((entry)->lo >> 9) & 0x7) + 7))
> > >
> > > +/* Virtual command interface for enlightened pasid management. */
> > > +#define VCMD_CMD_ALLOC 0x1
> > > +#define VCMD_CMD_FREE 0x2
> > > +#define VCMD_VRSP_IP 0x1
> > > +#define VCMD_VRSP_SC(e) (((e) >> 1) & 0x3)
> > > +#define VCMD_VRSP_SC_SUCCESS 0
> > > +#define VCMD_VRSP_SC_NO_PASID_AVAIL 1
> > > +#define VCMD_VRSP_SC_INVALID_PASID 1
> > > +#define VCMD_VRSP_RESULT(e) (((e) >> 8) & 0xfffff)
> > > +
> > > /*
> > > * Domain ID reserved for pasid entries programmed for first-level
> > > * only and pass-through transfer modes.
> > > @@ -95,5 +105,6 @@ int intel_pasid_setup_pass_through(struct
> > > intel_iommu *iommu,
> > > struct device *dev, int pasid);
> > > void intel_pasid_tear_down_entry(struct intel_iommu *iommu,
> > > struct device *dev, int pasid);
> > > -
> > > +int vcmd_alloc_pasid(struct intel_iommu *iommu, unsigned int
> > > *pasid); +void vcmd_free_pasid(struct intel_iommu *iommu, unsigned
> > > int pasid); #endif /* __INTEL_PASID_H */
> > > diff --git a/include/linux/intel-iommu.h
> > > b/include/linux/intel-iommu.h index 2e1bed9b7eef..1d4b8dcdc5d8
> > > 100644 --- a/include/linux/intel-iommu.h
> > > +++ b/include/linux/intel-iommu.h
> > > @@ -161,6 +161,7 @@
> > > #define ecap_smpwc(e) (((e) >> 48) & 0x1)
> > > #define ecap_flts(e) (((e) >> 47) & 0x1)
> > > #define ecap_slts(e) (((e) >> 46) & 0x1)
> > > +#define ecap_vcs(e) (((e) >> 44) & 0x1)
> > > #define ecap_smts(e) (((e) >> 43) & 0x1)
> > > #define ecap_dit(e) ((e >> 41) & 0x1)
> > > #define ecap_pasid(e) ((e >> 40) & 0x1)
> > > @@ -282,6 +283,7 @@
> > >
> > > /* PRS_REG */
> > > #define DMA_PRS_PPR ((u32)1)
> > > +#define DMA_VCS_PAS ((u64)1)
> > >
> > > #define IOMMU_WAIT_OP(iommu, offset, op, cond, sts)
> > > \
> > > do
> > > {
> > > \ -- 2.7.4
> >
>
> [Jacob Pan]
next prev parent reply other threads:[~2019-10-29 18:16 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-24 19:54 [PATCH v7 00/11] Nested Shared Virtual Address (SVA) VT-d support Jacob Pan
2019-10-24 19:54 ` [PATCH v7 01/11] iommu/vt-d: Cache virtual command capability register Jacob Pan
2019-10-25 2:53 ` Lu Baolu
2019-10-25 6:06 ` Tian, Kevin
2019-11-08 10:32 ` Auger Eric
2019-10-24 19:54 ` [PATCH v7 02/11] iommu/vt-d: Enlightened PASID allocation Jacob Pan
2019-10-25 6:19 ` Tian, Kevin
2019-10-29 17:14 ` Jacob Pan
2019-10-29 18:16 ` Tian, Kevin [this message]
2019-11-08 10:33 ` Auger Eric
2019-11-08 22:22 ` Jacob Pan
2019-10-24 19:54 ` [PATCH v7 03/11] iommu/vt-d: Add custom allocator for IOASID Jacob Pan
2019-10-25 2:30 ` Lu Baolu
2019-10-25 4:43 ` Jacob Pan
2019-10-25 6:40 ` Tian, Kevin
2019-10-25 14:39 ` Lu Baolu
2019-10-25 15:52 ` Tian, Kevin
2019-10-28 22:49 ` Jacob Pan
2019-10-29 2:22 ` Lu Baolu
2019-10-25 6:31 ` Tian, Kevin
2019-10-28 22:52 ` Jacob Pan
2019-11-08 10:40 ` Auger Eric
2019-11-08 22:26 ` Jacob Pan
2019-10-24 19:54 ` [PATCH v7 04/11] iommu/vt-d: Replace Intel specific PASID allocator with IOASID Jacob Pan
2019-10-25 5:47 ` Lu Baolu
2019-11-01 18:29 ` Jacob Pan
2019-10-25 6:41 ` Tian, Kevin
2019-10-28 22:46 ` Jacob Pan
2019-11-08 11:30 ` Auger Eric
2019-11-08 22:55 ` Jacob Pan
2019-11-12 9:54 ` Auger Eric
2019-10-24 19:54 ` [PATCH v7 05/11] iommu/vt-d: Move domain helper to header Jacob Pan
2019-10-25 5:26 ` Lu Baolu
2019-10-24 19:54 ` [PATCH v7 06/11] iommu/vt-d: Avoid duplicated code for PASID setup Jacob Pan
2019-10-25 5:32 ` Lu Baolu
2019-10-25 6:42 ` Tian, Kevin
2019-10-28 22:41 ` Jacob Pan
2019-11-12 9:54 ` Auger Eric
2019-10-24 19:55 ` [PATCH v7 07/11] iommu/vt-d: Add nested translation helper function Jacob Pan
2019-10-25 7:04 ` Tian, Kevin
2019-11-01 21:10 ` Jacob Pan
2019-10-25 15:04 ` Lu Baolu
2019-10-25 16:06 ` Jacob Pan
2019-11-08 13:55 ` Auger Eric
2019-10-24 19:55 ` [PATCH v7 08/11] iommu/vt-d: Misc macro clean up for SVM Jacob Pan
2019-10-26 1:00 ` Lu Baolu
2019-10-28 22:38 ` Jacob Pan
2019-10-24 19:55 ` [PATCH v7 09/11] iommu/vt-d: Add bind guest PASID support Jacob Pan
2019-10-25 7:19 ` Tian, Kevin
2019-10-25 17:33 ` Jacob Pan
2019-10-28 6:03 ` Tian, Kevin
2019-10-28 16:02 ` Jacob Pan
2019-10-29 7:57 ` Tian, Kevin
2019-10-29 16:11 ` Jacob Pan
2019-10-29 18:04 ` Tian, Kevin
2019-10-29 2:33 ` Lu Baolu
2019-10-26 2:01 ` Lu Baolu
2019-10-28 22:29 ` Jacob Pan
2019-10-29 2:54 ` Lu Baolu
2019-10-29 4:11 ` Jacob Pan
2019-10-29 5:04 ` Lu Baolu
2019-10-24 19:55 ` [PATCH v7 10/11] iommu/vt-d: Support flushing more translation cache types Jacob Pan
2019-10-25 7:21 ` Tian, Kevin
2019-11-01 21:30 ` Jacob Pan
2019-10-26 2:22 ` Lu Baolu
2019-11-01 21:28 ` Jacob Pan
2019-11-08 16:18 ` Auger Eric
2019-11-08 23:05 ` Jacob Pan
2019-10-24 19:55 ` [PATCH v7 11/11] iommu/vt-d: Add svm/sva invalidate function Jacob Pan
2019-10-25 7:27 ` Tian, Kevin
2019-10-26 2:40 ` Lu Baolu
2019-10-26 7:03 ` Lu Baolu
2019-10-28 6:06 ` Tian, Kevin
2019-10-28 16:10 ` Jacob Pan
2019-10-29 18:52 ` Tian, Kevin
2019-10-29 19:25 ` Jacob Pan
2019-10-28 16:13 ` Jacob Pan
2019-11-12 10:28 ` Auger Eric
2020-02-15 1:18 ` Jacob Pan
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=AADFC41AFE54684AB9EE6CBC0274A5D19D5DEE2B@SHSMSX104.ccr.corp.intel.com \
--to=kevin.tian@intel.com \
--cc=alex.williamson@redhat.com \
--cc=ashok.raj@intel.com \
--cc=baolu.lu@linux.intel.com \
--cc=dwmw2@infradead.org \
--cc=eric.auger@redhat.com \
--cc=hch@infradead.org \
--cc=iommu@lists.linux-foundation.org \
--cc=jacob.jun.pan@linux.intel.com \
--cc=jean-philippe@linaro.com \
--cc=jic23@kernel.org \
--cc=joro@8bytes.org \
--cc=linux-kernel@vger.kernel.org \
--cc=yi.l.liu@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).