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@@ -0,0 +1,274 @@ | ||
From patchwork Fri Dec 23 08:50:46 2022 | ||
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From: Alexander Graf <agraf@csgraf.de> | ||
To: qemu-devel@nongnu.org | ||
Cc: Peter Maydell <peter.maydell@linaro.org>, qemu-arm@nongnu.org, | ||
Yanan Wang <wangyanan55@huawei.com>, | ||
=?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= <philmd@linaro.org>, | ||
Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, | ||
Eduardo Habkost <eduardo@habkost.net>, | ||
Shashi Mallela <shashi.mallela@linaro.org>, | ||
Eric Auger <eric.auger@redhat.com>, Neil Armstrong <narmstrong@baylibre.com> | ||
Subject: [PATCH 1/2] hw/intc/arm_gicv3: Make ITT entry size configurable | ||
Date: Fri, 23 Dec 2022 09:50:46 +0100 | ||
Message-Id: <20221223085047.94832-2-agraf@csgraf.de> | ||
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||
An ITT entry is opaque to the OS. The only thing it does get told by HW is | ||
its size. In theory, that size can be any byte aligned number, in practice | ||
HW will always use power of 2s to simplify offset calculation. We currently | ||
expose the size as 12, which is not a power of 2. | ||
|
||
To prepare for a future where we expose power of 2 sized entry sizes, let's | ||
make the size itself configurable. We only need to watch out that we don't | ||
have an entry be smaller than the fields we want to access inside. Bigger | ||
is always fine. | ||
|
||
Signed-off-by: Alexander Graf <agraf@csgraf.de> | ||
--- | ||
hw/intc/arm_gicv3_its.c | 14 +++++++++++--- | ||
hw/intc/gicv3_internal.h | 2 +- | ||
include/hw/intc/arm_gicv3_its_common.h | 1 + | ||
3 files changed, 13 insertions(+), 4 deletions(-) | ||
|
||
diff --git a/hw/intc/arm_gicv3_its.c b/hw/intc/arm_gicv3_its.c | ||
index 57c79da5c5..e7cabeb46c 100644 | ||
--- a/hw/intc/arm_gicv3_its.c | ||
+++ b/hw/intc/arm_gicv3_its.c | ||
@@ -215,7 +215,7 @@ static bool update_ite(GICv3ITSState *s, uint32_t eventid, const DTEntry *dte, | ||
{ | ||
AddressSpace *as = &s->gicv3->dma_as; | ||
MemTxResult res = MEMTX_OK; | ||
- hwaddr iteaddr = dte->ittaddr + eventid * ITS_ITT_ENTRY_SIZE; | ||
+ hwaddr iteaddr = dte->ittaddr + eventid * s->itt_entry_size; | ||
uint64_t itel = 0; | ||
uint32_t iteh = 0; | ||
|
||
@@ -253,7 +253,7 @@ static MemTxResult get_ite(GICv3ITSState *s, uint32_t eventid, | ||
MemTxResult res = MEMTX_OK; | ||
uint64_t itel; | ||
uint32_t iteh; | ||
- hwaddr iteaddr = dte->ittaddr + eventid * ITS_ITT_ENTRY_SIZE; | ||
+ hwaddr iteaddr = dte->ittaddr + eventid * s->itt_entry_size; | ||
|
||
itel = address_space_ldq_le(as, iteaddr, MEMTXATTRS_UNSPECIFIED, &res); | ||
if (res != MEMTX_OK) { | ||
@@ -1934,6 +1934,12 @@ static void gicv3_arm_its_realize(DeviceState *dev, Error **errp) | ||
} | ||
} | ||
|
||
+ if (s->itt_entry_size < MIN_ITS_ITT_ENTRY_SIZE) { | ||
+ error_setg(errp, "ITT entry size must be at least %d", | ||
+ MIN_ITS_ITT_ENTRY_SIZE); | ||
+ return; | ||
+ } | ||
+ | ||
gicv3_add_its(s->gicv3, dev); | ||
|
||
gicv3_its_init_mmio(s, &gicv3_its_control_ops, &gicv3_its_translation_ops); | ||
@@ -1941,7 +1947,7 @@ static void gicv3_arm_its_realize(DeviceState *dev, Error **errp) | ||
/* set the ITS default features supported */ | ||
s->typer = FIELD_DP64(s->typer, GITS_TYPER, PHYSICAL, 1); | ||
s->typer = FIELD_DP64(s->typer, GITS_TYPER, ITT_ENTRY_SIZE, | ||
- ITS_ITT_ENTRY_SIZE - 1); | ||
+ s->itt_entry_size - 1); | ||
s->typer = FIELD_DP64(s->typer, GITS_TYPER, IDBITS, ITS_IDBITS); | ||
s->typer = FIELD_DP64(s->typer, GITS_TYPER, DEVBITS, ITS_DEVBITS); | ||
s->typer = FIELD_DP64(s->typer, GITS_TYPER, CIL, 1); | ||
@@ -2008,6 +2014,8 @@ static void gicv3_its_post_load(GICv3ITSState *s) | ||
static Property gicv3_its_props[] = { | ||
DEFINE_PROP_LINK("parent-gicv3", GICv3ITSState, gicv3, "arm-gicv3", | ||
GICv3State *), | ||
+ DEFINE_PROP_UINT8("itt-entry-size", GICv3ITSState, itt_entry_size, | ||
+ MIN_ITS_ITT_ENTRY_SIZE), | ||
DEFINE_PROP_END_OF_LIST(), | ||
}; | ||
|
||
diff --git a/hw/intc/gicv3_internal.h b/hw/intc/gicv3_internal.h | ||
index 29d5cdc1b6..2aca1ba095 100644 | ||
--- a/hw/intc/gicv3_internal.h | ||
+++ b/hw/intc/gicv3_internal.h | ||
@@ -450,7 +450,7 @@ FIELD(VINVALL_1, VPEID, 32, 16) | ||
* the value of that field in memory cannot be relied upon -- older | ||
* versions of QEMU did not correctly write to that memory.) | ||
*/ | ||
-#define ITS_ITT_ENTRY_SIZE 0xC | ||
+#define MIN_ITS_ITT_ENTRY_SIZE 0xC | ||
|
||
FIELD(ITE_L, VALID, 0, 1) | ||
FIELD(ITE_L, INTTYPE, 1, 1) | ||
diff --git a/include/hw/intc/arm_gicv3_its_common.h b/include/hw/intc/arm_gicv3_its_common.h | ||
index a11a0f6654..e730a5482c 100644 | ||
--- a/include/hw/intc/arm_gicv3_its_common.h | ||
+++ b/include/hw/intc/arm_gicv3_its_common.h | ||
@@ -66,6 +66,7 @@ struct GICv3ITSState { | ||
int dev_fd; /* kvm device fd if backed by kvm vgic support */ | ||
uint64_t gits_translater_gpa; | ||
bool translater_gpa_known; | ||
+ uint8_t itt_entry_size; | ||
|
||
/* Registers */ | ||
uint32_t ctlr; | ||
|
||
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To: qemu-devel@nongnu.org | ||
Cc: Peter Maydell <peter.maydell@linaro.org>, qemu-arm@nongnu.org, | ||
Yanan Wang <wangyanan55@huawei.com>, | ||
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Shashi Mallela <shashi.mallela@linaro.org>, | ||
Eric Auger <eric.auger@redhat.com>, Neil Armstrong <narmstrong@baylibre.com> | ||
Subject: [PATCH 2/2] hw/intc/arm_gicv3: Bump ITT entry size to 16 | ||
Date: Fri, 23 Dec 2022 09:50:47 +0100 | ||
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|
||
Some Operating Systems (like Windows) can only deal with ITT entry sizes | ||
that are a power of 2. While the spec allows arbitrarily sized ITT entry | ||
sizes, in practice all hardware will use power of 2 because that | ||
simplifies offset calculation and ensures that a power of 2 sized region | ||
can hold a set of entries without gap at the end. | ||
|
||
So let's just bump the entry size to 16. That gives us enough space for | ||
the 12 bytes of data that we want to have in each ITT entry and makes | ||
QEMU look a bit more like real hardware. | ||
|
||
Signed-off-by: Alexander Graf <agraf@csgraf.de> | ||
--- | ||
hw/core/machine.c | 4 +++- | ||
hw/intc/arm_gicv3_its.c | 3 +-- | ||
2 files changed, 4 insertions(+), 3 deletions(-) | ||
|
||
diff --git a/hw/core/machine.c b/hw/core/machine.c | ||
index 8d34caa31d..c81b3810c2 100644 | ||
--- a/hw/core/machine.c | ||
+++ b/hw/core/machine.c | ||
@@ -51,6 +51,7 @@ GlobalProperty hw_compat_7_1[] = { | ||
{ "virtio-rng-pci", "vectors", "0" }, | ||
{ "virtio-rng-pci-transitional", "vectors", "0" }, | ||
{ "virtio-rng-pci-non-transitional", "vectors", "0" }, | ||
+ { "arm-gicv3-its", "itt-entry-size", "12" }, | ||
}; | ||
const size_t hw_compat_7_1_len = G_N_ELEMENTS(hw_compat_7_1); | ||
|
||
diff --git a/hw/intc/arm_gicv3_its.c b/hw/intc/arm_gicv3_its.c | ||
index e7cabeb46c..6754523321 100644 | ||
--- a/hw/intc/arm_gicv3_its.c | ||
+++ b/hw/intc/arm_gicv3_its.c | ||
@@ -2014,8 +2014,7 @@ static void gicv3_its_post_load(GICv3ITSState *s) | ||
static Property gicv3_its_props[] = { | ||
DEFINE_PROP_LINK("parent-gicv3", GICv3ITSState, gicv3, "arm-gicv3", | ||
GICv3State *), | ||
- DEFINE_PROP_UINT8("itt-entry-size", GICv3ITSState, itt_entry_size, | ||
- MIN_ITS_ITT_ENTRY_SIZE), | ||
+ DEFINE_PROP_UINT8("itt-entry-size", GICv3ITSState, itt_entry_size, 16), | ||
DEFINE_PROP_END_OF_LIST(), | ||
}; | ||
|
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