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qemu-kvm/SOURCES/kvm-intel-iommu-introduce-vtd_page_walk_info.patch

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From 22bf46f7576cc12a301d34ca743a6661afcb61ac Mon Sep 17 00:00:00 2001
From: Peter Xu <peterx@redhat.com>
Date: Fri, 12 Oct 2018 07:58:42 +0100
Subject: [PATCH 12/17] intel-iommu: introduce vtd_page_walk_info
RH-Author: Peter Xu <peterx@redhat.com>
Message-id: <20181012075846.25449-6-peterx@redhat.com>
Patchwork-id: 82678
O-Subject: [RHEL-8 qemu-kvm PATCH 5/9] intel-iommu: introduce vtd_page_walk_info
Bugzilla: 1450712
RH-Acked-by: Auger Eric <eric.auger@redhat.com>
RH-Acked-by: Xiao Wang <jasowang@redhat.com>
RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>
During the recursive page walking of IOVA page tables, some stack
variables are constant variables and never changed during the whole page
walking procedure. Isolate them into a struct so that we don't need to
pass those contants down the stack every time and multiple times.
CC: QEMU Stable <qemu-stable@nongnu.org>
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit fe215b0cbb8c1f4b4af0a64aa5c02042080dd537)
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
hw/i386/intel_iommu.c | 84 +++++++++++++++++++++++++++++++--------------------
1 file changed, 52 insertions(+), 32 deletions(-)
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 38ccc74..e247269 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -748,9 +748,27 @@ static int vtd_iova_to_slpte(VTDContextEntry *ce, uint64_t iova, bool is_write,
typedef int (*vtd_page_walk_hook)(IOMMUTLBEntry *entry, void *private);
+/**
+ * Constant information used during page walking
+ *
+ * @hook_fn: hook func to be called when detected page
+ * @private: private data to be passed into hook func
+ * @notify_unmap: whether we should notify invalid entries
+ * @aw: maximum address width
+ */
+typedef struct {
+ vtd_page_walk_hook hook_fn;
+ void *private;
+ bool notify_unmap;
+ uint8_t aw;
+} vtd_page_walk_info;
+
static int vtd_page_walk_one(IOMMUTLBEntry *entry, int level,
- vtd_page_walk_hook hook_fn, void *private)
+ vtd_page_walk_info *info)
{
+ vtd_page_walk_hook hook_fn = info->hook_fn;
+ void *private = info->private;
+
assert(hook_fn);
trace_vtd_page_walk_one(level, entry->iova, entry->translated_addr,
entry->addr_mask, entry->perm);
@@ -763,17 +781,13 @@ static int vtd_page_walk_one(IOMMUTLBEntry *entry, int level,
* @addr: base GPA addr to start the walk
* @start: IOVA range start address
* @end: IOVA range end address (start <= addr < end)
- * @hook_fn: hook func to be called when detected page
- * @private: private data to be passed into hook func
* @read: whether parent level has read permission
* @write: whether parent level has write permission
- * @notify_unmap: whether we should notify invalid entries
- * @aw: maximum address width
+ * @info: constant information for the page walk
*/
static int vtd_page_walk_level(dma_addr_t addr, uint64_t start,
- uint64_t end, vtd_page_walk_hook hook_fn,
- void *private, uint32_t level, bool read,
- bool write, bool notify_unmap, uint8_t aw)
+ uint64_t end, uint32_t level, bool read,
+ bool write, vtd_page_walk_info *info)
{
bool read_cur, write_cur, entry_valid;
uint32_t offset;
@@ -823,24 +837,24 @@ static int vtd_page_walk_level(dma_addr_t addr, uint64_t start,
if (vtd_is_last_slpte(slpte, level)) {
/* NOTE: this is only meaningful if entry_valid == true */
- entry.translated_addr = vtd_get_slpte_addr(slpte, aw);
- if (!entry_valid && !notify_unmap) {
+ entry.translated_addr = vtd_get_slpte_addr(slpte, info->aw);
+ if (!entry_valid && !info->notify_unmap) {
trace_vtd_page_walk_skip_perm(iova, iova_next);
goto next;
}
- ret = vtd_page_walk_one(&entry, level, hook_fn, private);
+ ret = vtd_page_walk_one(&entry, level, info);
if (ret < 0) {
return ret;
}
} else {
if (!entry_valid) {
- if (notify_unmap) {
+ if (info->notify_unmap) {
/*
* The whole entry is invalid; unmap it all.
* Translated address is meaningless, zero it.
*/
entry.translated_addr = 0x0;
- ret = vtd_page_walk_one(&entry, level, hook_fn, private);
+ ret = vtd_page_walk_one(&entry, level, info);
if (ret < 0) {
return ret;
}
@@ -849,10 +863,9 @@ static int vtd_page_walk_level(dma_addr_t addr, uint64_t start,
}
goto next;
}
- ret = vtd_page_walk_level(vtd_get_slpte_addr(slpte, aw), iova,
- MIN(iova_next, end), hook_fn, private,
- level - 1, read_cur, write_cur,
- notify_unmap, aw);
+ ret = vtd_page_walk_level(vtd_get_slpte_addr(slpte, info->aw),
+ iova, MIN(iova_next, end), level - 1,
+ read_cur, write_cur, info);
if (ret < 0) {
return ret;
}
@@ -871,28 +884,24 @@ next:
* @ce: context entry to walk upon
* @start: IOVA address to start the walk
* @end: IOVA range end address (start <= addr < end)
- * @hook_fn: the hook that to be called for each detected area
- * @private: private data for the hook function
- * @aw: maximum address width
+ * @info: page walking information struct
*/
static int vtd_page_walk(VTDContextEntry *ce, uint64_t start, uint64_t end,
- vtd_page_walk_hook hook_fn, void *private,
- bool notify_unmap, uint8_t aw)
+ vtd_page_walk_info *info)
{
dma_addr_t addr = vtd_ce_get_slpt_base(ce);
uint32_t level = vtd_ce_get_level(ce);
- if (!vtd_iova_range_check(start, ce, aw)) {
+ if (!vtd_iova_range_check(start, ce, info->aw)) {
return -VTD_FR_ADDR_BEYOND_MGAW;
}
- if (!vtd_iova_range_check(end, ce, aw)) {
+ if (!vtd_iova_range_check(end, ce, info->aw)) {
/* Fix end so that it reaches the maximum */
- end = vtd_iova_limit(ce, aw);
+ end = vtd_iova_limit(ce, info->aw);
}
- return vtd_page_walk_level(addr, start, end, hook_fn, private,
- level, true, true, notify_unmap, aw);
+ return vtd_page_walk_level(addr, start, end, level, true, true, info);
}
/* Map a device to its corresponding domain (context-entry) */
@@ -1449,14 +1458,19 @@ static void vtd_iotlb_page_invalidate_notify(IntelIOMMUState *s,
vtd_as->devfn, &ce);
if (!ret && domain_id == VTD_CONTEXT_ENTRY_DID(ce.hi)) {
if (vtd_as_has_map_notifier(vtd_as)) {
+ vtd_page_walk_info info = {
+ .hook_fn = vtd_page_invalidate_notify_hook,
+ .private = (void *)&vtd_as->iommu,
+ .notify_unmap = true,
+ .aw = s->aw_bits,
+ };
+
/*
* As long as we have MAP notifications registered in
* any of our IOMMU notifiers, we need to sync the
* shadow page table.
*/
- vtd_page_walk(&ce, addr, addr + size,
- vtd_page_invalidate_notify_hook,
- (void *)&vtd_as->iommu, true, s->aw_bits);
+ vtd_page_walk(&ce, addr, addr + size, &info);
} else {
/*
* For UNMAP-only notifiers, we don't need to walk the
@@ -2924,8 +2938,14 @@ static void vtd_iommu_replay(IOMMUMemoryRegion *iommu_mr, IOMMUNotifier *n)
ce.hi, ce.lo);
if (vtd_as_has_map_notifier(vtd_as)) {
/* This is required only for MAP typed notifiers */
- vtd_page_walk(&ce, 0, ~0ULL, vtd_replay_hook, (void *)n, false,
- s->aw_bits);
+ vtd_page_walk_info info = {
+ .hook_fn = vtd_replay_hook,
+ .private = (void *)n,
+ .notify_unmap = false,
+ .aw = s->aw_bits,
+ };
+
+ vtd_page_walk(&ce, 0, ~0ULL, &info);
}
} else {
trace_vtd_replay_ce_invalid(bus_n, PCI_SLOT(vtd_as->devfn),
--
1.8.3.1
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