[PULL 0/5] target-arm queue
[PULL 0/1] target-arm queue
1
Hi; this is a collection of mostly GIC related patches for rc3.
1
The following changes since commit e3debd5e7d0ce031356024878a0a18b9d109354a:
2
The "Update cached state after LPI state changes" fix is important
3
and fixes what would otherwise be a regression since we enable the
4
ITS by default in the virt board now. The others are not regressions
5
but I think are OK for rc3 as they're fairly self contained (and two
6
of them are fixes to new-in-6.2 functionality).
7
2
8
thanks
3
Merge tag 'pull-request-2023-03-24' of https://gitlab.com/thuth/qemu into staging (2023-03-24 16:08:46 +0000)
9
-- PMM
10
11
The following changes since commit dd4b0de45965538f19bb40c7ddaaba384a8c613a:
12
13
Fix version for v6.2.0-rc2 release (2021-11-26 11:58:54 +0100)
14
4
15
are available in the Git repository at:
5
are available in the Git repository at:
16
6
17
https://git.linaro.org/people/pmaydell/qemu-arm.git tags/pull-target-arm-20211129
7
https://git.linaro.org/people/pmaydell/qemu-arm.git tags/pull-target-arm-20230328
18
8
19
for you to fetch changes up to 90feffad2aafe856ed2af75313b2c1669ba671e9:
9
for you to fetch changes up to 46e3b237c52e0c48bfd81bce020b51fbe300b23a:
20
10
21
hw/intc/arm_gicv3: fix handling of LPIs in list registers (2021-11-29 10:10:21 +0000)
11
target/arm/gdbstub: Only advertise M-profile features if TCG available (2023-03-28 10:53:40 +0100)
22
12
23
----------------------------------------------------------------
13
----------------------------------------------------------------
24
target-arm queue:
14
target-arm queue:
25
* virt: Diagnose attempts to enable MTE or virt when using HVF accelerator
15
* fix part of the "TCG-disabled builds are broken" issue
26
* GICv3 ITS: Allow clearing of ITS CTLR Enabled bit
27
* GICv3: Update cached state after LPI state changes
28
* GICv3: Fix handling of LPIs in list registers
29
16
30
----------------------------------------------------------------
17
----------------------------------------------------------------
31
Alexander Graf (1):
18
Philippe Mathieu-Daudé (1):
32
hw/arm/virt: Extend nested and mte checks to hvf
19
target/arm/gdbstub: Only advertise M-profile features if TCG available
33
20
34
Peter Maydell (3):
21
target/arm/gdbstub.c | 5 +++--
35
hw/intc/arm_gicv3: Update cached state after LPI state changes
22
1 file changed, 3 insertions(+), 2 deletions(-)
36
hw/intc/arm_gicv3: Add new gicv3_intid_is_special() function
37
hw/intc/arm_gicv3: fix handling of LPIs in list registers
38
23
39
Shashi Mallela (1):
40
hw/intc: cannot clear GICv3 ITS CTLR[Enabled] bit
41
42
hw/intc/gicv3_internal.h | 30 ++++++++++++++++++++++++++++++
43
hw/arm/virt.c | 15 +++++++++------
44
hw/intc/arm_gicv3.c | 6 ++++--
45
hw/intc/arm_gicv3_cpuif.c | 9 ++++-----
46
hw/intc/arm_gicv3_its.c | 7 ++++---
47
hw/intc/arm_gicv3_redist.c | 14 ++++++++++----
48
6 files changed, 61 insertions(+), 20 deletions(-)
49
diff view generated by jsdifflib
[PULL 1/5] hw/arm/virt: Extend nested and mte checks to hvf
[PULL 1/1] target/arm/gdbstub: Only advertise M-profile features if TCG available
1
From: Alexander Graf <agraf@csgraf.de>
1
From: Philippe Mathieu-Daudé <philmd@linaro.org>
2
2
3
The virt machine has properties to enable MTE and Nested Virtualization
3
Cortex-M profile is only emulable from TCG accelerator. Restrict
4
support. However, its check to ensure the backing accel implementation
4
the GDBstub features to its availability in order to avoid a link
5
supports it today only looks for KVM and bails out if it finds it.
5
error when TCG is not enabled:
6
6
7
Extend the checks to HVF as well as it does not support either today.
7
Undefined symbols for architecture arm64:
8
This will cause QEMU to print a useful error message rather than
8
"_arm_v7m_get_sp_ptr", referenced from:
9
silently ignoring the attempt by the user to enable either MTE or
9
_m_sysreg_get in target_arm_gdbstub.c.o
10
the Virtualization extensions.
10
"_arm_v7m_mrs_control", referenced from:
11
_arm_gdb_get_m_systemreg in target_arm_gdbstub.c.o
12
ld: symbol(s) not found for architecture arm64
13
clang: error: linker command failed with exit code 1 (use -v to see invocation)
11
14
12
Reported-by: saar amar <saaramar5@gmail.com>
15
Fixes: 7d8b28b8b5 ("target/arm: Implement gdbstub m-profile systemreg and secext")
13
Signed-off-by: Alexander Graf <agraf@csgraf.de>
16
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
14
Message-id: 20211123122859.22452-1-agraf@csgraf.de
17
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
15
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
18
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
19
Message-id: 20230322142902.69511-3-philmd@linaro.org
20
[PMM: add #include since I cherry-picked this patch from the series]
16
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
21
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
17
---
22
---
18
hw/arm/virt.c | 15 +++++++++------
23
target/arm/gdbstub.c | 5 +++--
19
1 file changed, 9 insertions(+), 6 deletions(-)
24
1 file changed, 3 insertions(+), 2 deletions(-)
20
25
21
diff --git a/hw/arm/virt.c b/hw/arm/virt.c
26
diff --git a/target/arm/gdbstub.c b/target/arm/gdbstub.c
22
index XXXXXXX..XXXXXXX 100644
27
index XXXXXXX..XXXXXXX 100644
23
--- a/hw/arm/virt.c
28
--- a/target/arm/gdbstub.c
24
+++ b/hw/arm/virt.c
29
+++ b/target/arm/gdbstub.c
25
@@ -XXX,XX +XXX,XX @@
30
@@ -XXX,XX +XXX,XX @@
26
#include "sysemu/runstate.h"
31
#include "cpu.h"
27
#include "sysemu/tpm.h"
32
#include "exec/gdbstub.h"
28
#include "sysemu/kvm.h"
33
#include "gdbstub/helpers.h"
29
+#include "sysemu/hvf.h"
34
+#include "sysemu/tcg.h"
30
#include "hw/loader.h"
35
#include "internals.h"
31
#include "qapi/error.h"
36
#include "cpregs.h"
32
#include "qemu/bitops.h"
37
33
@@ -XXX,XX +XXX,XX @@ static void machvirt_init(MachineState *machine)
38
@@ -XXX,XX +XXX,XX @@ void arm_cpu_register_gdb_regs_for_features(ARMCPU *cpu)
34
exit(1);
39
2, "arm-vfp-sysregs.xml", 0);
40
}
35
}
41
}
36
42
- if (cpu_isar_feature(aa32_mve, cpu)) {
37
- if (vms->virt && kvm_enabled()) {
43
+ if (cpu_isar_feature(aa32_mve, cpu) && tcg_enabled()) {
38
- error_report("mach-virt: KVM does not support providing "
44
gdb_register_coprocessor(cs, mve_gdb_get_reg, mve_gdb_set_reg,
39
- "Virtualization extensions to the guest CPU");
45
1, "arm-m-profile-mve.xml", 0);
40
+ if (vms->virt && (kvm_enabled() || hvf_enabled())) {
41
+ error_report("mach-virt: %s does not support providing "
42
+ "Virtualization extensions to the guest CPU",
43
+ kvm_enabled() ? "KVM" : "HVF");
44
exit(1);
45
}
46
}
46
47
@@ -XXX,XX +XXX,XX @@ void arm_cpu_register_gdb_regs_for_features(ARMCPU *cpu)
47
- if (vms->mte && kvm_enabled()) {
48
arm_gen_dynamic_sysreg_xml(cs, cs->gdb_num_regs),
48
- error_report("mach-virt: KVM does not support providing "
49
"system-registers.xml", 0);
49
- "MTE to the guest CPU");
50
50
+ if (vms->mte && (kvm_enabled() || hvf_enabled())) {
51
- if (arm_feature(env, ARM_FEATURE_M)) {
51
+ error_report("mach-virt: %s does not support providing "
52
+ if (arm_feature(env, ARM_FEATURE_M) && tcg_enabled()) {
52
+ "MTE to the guest CPU",
53
gdb_register_coprocessor(cs,
53
+ kvm_enabled() ? "KVM" : "HVF");
54
arm_gdb_get_m_systemreg, arm_gdb_set_m_systemreg,
54
exit(1);
55
arm_gen_dynamic_m_systemreg_xml(cs, cs->gdb_num_regs),
55
}
56
57
--
56
--
58
2.25.1
57
2.34.1
59
58
60
59
diff view generated by jsdifflib
[PULL 2/5] hw/intc: cannot clear GICv3 ITS CTLR[Enabled] bit
Deleted patch
1
From: Shashi Mallela <shashi.mallela@linaro.org>
2
1
3
When Enabled bit is cleared in GITS_CTLR,ITS feature continues
4
to be enabled.This patch fixes the issue.
5
6
Signed-off-by: Shashi Mallela <shashi.mallela@linaro.org>
7
Tested-by: Alex Bennée <alex.bennee@linaro.org>
8
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
9
Message-id: 20211124182246.67691-1-shashi.mallela@linaro.org
10
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
11
---
12
hw/intc/arm_gicv3_its.c | 7 ++++---
13
1 file changed, 4 insertions(+), 3 deletions(-)
14
15
diff --git a/hw/intc/arm_gicv3_its.c b/hw/intc/arm_gicv3_its.c
16
index XXXXXXX..XXXXXXX 100644
17
--- a/hw/intc/arm_gicv3_its.c
18
+++ b/hw/intc/arm_gicv3_its.c
19
@@ -XXX,XX +XXX,XX @@ static bool its_writel(GICv3ITSState *s, hwaddr offset,
20
21
switch (offset) {
22
case GITS_CTLR:
23
- s->ctlr |= (value & ~(s->ctlr));
24
-
25
- if (s->ctlr & ITS_CTLR_ENABLED) {
26
+ if (value & R_GITS_CTLR_ENABLED_MASK) {
27
+ s->ctlr |= ITS_CTLR_ENABLED;
28
extract_table_params(s);
29
extract_cmdq_params(s);
30
s->creadr = 0;
31
process_cmdq(s);
32
+ } else {
33
+ s->ctlr &= ~ITS_CTLR_ENABLED;
34
}
35
break;
36
case GITS_CBASER:
37
--
38
2.25.1
39
40
diff view generated by jsdifflib
[PULL 3/5] hw/intc/arm_gicv3: Update cached state after LPI state changes
Deleted patch
1
The logic of gicv3_redist_update() is as follows:
2
* it must be called in any code path that changes the state of
3
(only) redistributor interrupts
4
* if it finds a redistributor interrupt that is (now) higher
5
priority than the previous highest-priority pending interrupt,
6
then this must be the new highest-priority pending interrupt
7
* if it does *not* find a better redistributor interrupt, then:
8
- if the previous state was "no interrupts pending" then
9
the new state is still "no interrupts pending"
10
- if the previous best interrupt was not a redistributor
11
interrupt then that remains the best interrupt
12
- if the previous best interrupt *was* a redistributor interrupt,
13
then the new best interrupt must be some non-redistributor
14
interrupt, but we don't know which so must do a full scan
15
1
16
In commit 17fb5e36aabd4b2c125 we effectively added the LPI interrupts
17
as a kind of "redistributor interrupt" for this purpose, by adding
18
cs->hpplpi to the set of things that gicv3_redist_update() considers
19
before it gives up and decides to do a full scan of distributor
20
interrupts. However we didn't quite get this right:
21
* the condition check for "was the previous best interrupt a
22
redistributor interrupt" must be updated to include LPIs
23
in what it considers to be redistributor interrupts
24
* every code path which updates the LPI state which
25
gicv3_redist_update() checks must also call gicv3_redist_update():
26
this is cs->hpplpi and the GICR_CTLR ENABLE_LPIS bit
27
28
This commit fixes this by:
29
* correcting the test on cs->hppi.irq in gicv3_redist_update()
30
* making gicv3_redist_update_lpi() always call gicv3_redist_update()
31
* introducing a new gicv3_redist_update_lpi_only() for the one
32
callsite (the post-load hook) which must not call
33
gicv3_redist_update()
34
* making gicv3_redist_lpi_pending() always call gicv3_redist_update(),
35
either directly or via gicv3_redist_update_lpi()
36
* removing a couple of now-unnecessary calls to gicv3_redist_update()
37
from some callers of those two functions
38
* calling gicv3_redist_update() when the GICR_CTLR ENABLE_LPIS
39
bit is cleared
40
41
(This means that the not-file-local gicv3_redist_* LPI related
42
functions now all take care of the updates of internally cached
43
GICv3 information, in the same way the older functions
44
gicv3_redist_set_irq() and gicv3_redist_send_sgi() do.)
45
46
The visible effect of this bug was that when the guest acknowledged
47
an LPI by reading ICC_IAR1_EL1, we marked it as not pending in the
48
LPI data structure but still left it in cs->hppi so we would offer it
49
to the guest again. In particular for setups using an emulated GICv3
50
and ITS and using devices which use LPIs (ie PCI devices) a Linux
51
guest would complain "irq 54: nobody cared" and then hang. (The hang
52
was intermittent, presumably depending on the timing between
53
different interrupts arriving and being completed.)
54
55
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
56
Tested-by: Alex Bennée <alex.bennee@linaro.org>
57
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
58
Message-id: 20211124202005.989935-1-peter.maydell@linaro.org
59
---
60
hw/intc/gicv3_internal.h | 17 +++++++++++++++++
61
hw/intc/arm_gicv3.c | 6 ++++--
62
hw/intc/arm_gicv3_redist.c | 14 ++++++++++----
63
3 files changed, 31 insertions(+), 6 deletions(-)
64
65
diff --git a/hw/intc/gicv3_internal.h b/hw/intc/gicv3_internal.h
66
index XXXXXXX..XXXXXXX 100644
67
--- a/hw/intc/gicv3_internal.h
68
+++ b/hw/intc/gicv3_internal.h
69
@@ -XXX,XX +XXX,XX @@ void gicv3_dist_set_irq(GICv3State *s, int irq, int level);
70
void gicv3_redist_set_irq(GICv3CPUState *cs, int irq, int level);
71
void gicv3_redist_process_lpi(GICv3CPUState *cs, int irq, int level);
72
void gicv3_redist_lpi_pending(GICv3CPUState *cs, int irq, int level);
73
+/**
74
+ * gicv3_redist_update_lpi:
75
+ * @cs: GICv3CPUState
76
+ *
77
+ * Scan the LPI pending table and recalculate the highest priority
78
+ * pending LPI and also the overall highest priority pending interrupt.
79
+ */
80
void gicv3_redist_update_lpi(GICv3CPUState *cs);
81
+/**
82
+ * gicv3_redist_update_lpi_only:
83
+ * @cs: GICv3CPUState
84
+ *
85
+ * Scan the LPI pending table and recalculate cs->hpplpi only,
86
+ * without calling gicv3_redist_update() to recalculate the overall
87
+ * highest priority pending interrupt. This should be called after
88
+ * an incoming migration has loaded new state.
89
+ */
90
+void gicv3_redist_update_lpi_only(GICv3CPUState *cs);
91
void gicv3_redist_send_sgi(GICv3CPUState *cs, int grp, int irq, bool ns);
92
void gicv3_init_cpuif(GICv3State *s);
93
94
diff --git a/hw/intc/arm_gicv3.c b/hw/intc/arm_gicv3.c
95
index XXXXXXX..XXXXXXX 100644
96
--- a/hw/intc/arm_gicv3.c
97
+++ b/hw/intc/arm_gicv3.c
98
@@ -XXX,XX +XXX,XX @@ static void gicv3_redist_update_noirqset(GICv3CPUState *cs)
99
* interrupt has reduced in priority and any other interrupt could
100
* now be the new best one).
101
*/
102
- if (!seenbetter && cs->hppi.prio != 0xff && cs->hppi.irq < GIC_INTERNAL) {
103
+ if (!seenbetter && cs->hppi.prio != 0xff &&
104
+ (cs->hppi.irq < GIC_INTERNAL ||
105
+ cs->hppi.irq >= GICV3_LPI_INTID_START)) {
106
gicv3_full_update_noirqset(cs->gic);
107
}
108
}
109
@@ -XXX,XX +XXX,XX @@ static void arm_gicv3_post_load(GICv3State *s)
110
* pending interrupt, but don't set IRQ or FIQ lines.
111
*/
112
for (i = 0; i < s->num_cpu; i++) {
113
- gicv3_redist_update_lpi(&s->cpu[i]);
114
+ gicv3_redist_update_lpi_only(&s->cpu[i]);
115
}
116
gicv3_full_update_noirqset(s);
117
/* Repopulate the cache of GICv3CPUState pointers for target CPUs */
118
diff --git a/hw/intc/arm_gicv3_redist.c b/hw/intc/arm_gicv3_redist.c
119
index XXXXXXX..XXXXXXX 100644
120
--- a/hw/intc/arm_gicv3_redist.c
121
+++ b/hw/intc/arm_gicv3_redist.c
122
@@ -XXX,XX +XXX,XX @@ static MemTxResult gicr_writel(GICv3CPUState *cs, hwaddr offset,
123
cs->gicr_ctlr |= GICR_CTLR_ENABLE_LPIS;
124
/* Check for any pending interr in pending table */
125
gicv3_redist_update_lpi(cs);
126
- gicv3_redist_update(cs);
127
} else {
128
cs->gicr_ctlr &= ~GICR_CTLR_ENABLE_LPIS;
129
+ /* cs->hppi might have been an LPI; recalculate */
130
+ gicv3_redist_update(cs);
131
}
132
}
133
return MEMTX_OK;
134
@@ -XXX,XX +XXX,XX @@ static void gicv3_redist_check_lpi_priority(GICv3CPUState *cs, int irq)
135
}
136
}
137
138
-void gicv3_redist_update_lpi(GICv3CPUState *cs)
139
+void gicv3_redist_update_lpi_only(GICv3CPUState *cs)
140
{
141
/*
142
* This function scans the LPI pending table and for each pending
143
@@ -XXX,XX +XXX,XX @@ void gicv3_redist_update_lpi(GICv3CPUState *cs)
144
}
145
}
146
147
+void gicv3_redist_update_lpi(GICv3CPUState *cs)
148
+{
149
+ gicv3_redist_update_lpi_only(cs);
150
+ gicv3_redist_update(cs);
151
+}
152
+
153
void gicv3_redist_lpi_pending(GICv3CPUState *cs, int irq, int level)
154
{
155
/*
156
@@ -XXX,XX +XXX,XX @@ void gicv3_redist_lpi_pending(GICv3CPUState *cs, int irq, int level)
157
*/
158
if (level) {
159
gicv3_redist_check_lpi_priority(cs, irq);
160
+ gicv3_redist_update(cs);
161
} else {
162
if (irq == cs->hpplpi.irq) {
163
gicv3_redist_update_lpi(cs);
164
@@ -XXX,XX +XXX,XX @@ void gicv3_redist_process_lpi(GICv3CPUState *cs, int irq, int level)
165
166
/* set/clear the pending bit for this irq */
167
gicv3_redist_lpi_pending(cs, irq, level);
168
-
169
- gicv3_redist_update(cs);
170
}
171
172
void gicv3_redist_set_irq(GICv3CPUState *cs, int irq, int level)
173
--
174
2.25.1
175
176
diff view generated by jsdifflib
[PULL 4/5] hw/intc/arm_gicv3: Add new gicv3_intid_is_special() function
Deleted patch
1
The GICv3/v4 pseudocode has a function IsSpecial() which returns true
2
if passed a "special" interrupt ID number (anything between 1020 and
3
1023 inclusive). We open-code this condition in a couple of places,
4
so abstract it out into a new function gicv3_intid_is_special().
5
1
6
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
7
Reviewed-by: Marc Zyngier <maz@kernel.org>
8
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
9
---
10
hw/intc/gicv3_internal.h | 13 +++++++++++++
11
hw/intc/arm_gicv3_cpuif.c | 4 ++--
12
2 files changed, 15 insertions(+), 2 deletions(-)
13
14
diff --git a/hw/intc/gicv3_internal.h b/hw/intc/gicv3_internal.h
15
index XXXXXXX..XXXXXXX 100644
16
--- a/hw/intc/gicv3_internal.h
17
+++ b/hw/intc/gicv3_internal.h
18
@@ -XXX,XX +XXX,XX @@ FIELD(MAPC, RDBASE, 16, 32)
19
20
/* Functions internal to the emulated GICv3 */
21
22
+/**
23
+ * gicv3_intid_is_special:
24
+ * @intid: interrupt ID
25
+ *
26
+ * Return true if @intid is a special interrupt ID (1020 to
27
+ * 1023 inclusive). This corresponds to the GIC spec pseudocode
28
+ * IsSpecial() function.
29
+ */
30
+static inline bool gicv3_intid_is_special(int intid)
31
+{
32
+ return intid >= INTID_SECURE && intid <= INTID_SPURIOUS;
33
+}
34
+
35
/**
36
* gicv3_redist_update:
37
* @cs: GICv3CPUState for this redistributor
38
diff --git a/hw/intc/arm_gicv3_cpuif.c b/hw/intc/arm_gicv3_cpuif.c
39
index XXXXXXX..XXXXXXX 100644
40
--- a/hw/intc/arm_gicv3_cpuif.c
41
+++ b/hw/intc/arm_gicv3_cpuif.c
42
@@ -XXX,XX +XXX,XX @@ static uint64_t icc_iar0_read(CPUARMState *env, const ARMCPRegInfo *ri)
43
intid = icc_hppir0_value(cs, env);
44
}
45
46
- if (!(intid >= INTID_SECURE && intid <= INTID_SPURIOUS)) {
47
+ if (!gicv3_intid_is_special(intid)) {
48
icc_activate_irq(cs, intid);
49
}
50
51
@@ -XXX,XX +XXX,XX @@ static uint64_t icc_iar1_read(CPUARMState *env, const ARMCPRegInfo *ri)
52
intid = icc_hppir1_value(cs, env);
53
}
54
55
- if (!(intid >= INTID_SECURE && intid <= INTID_SPURIOUS)) {
56
+ if (!gicv3_intid_is_special(intid)) {
57
icc_activate_irq(cs, intid);
58
}
59
60
--
61
2.25.1
62
63
diff view generated by jsdifflib
[PULL 5/5] hw/intc/arm_gicv3: fix handling of LPIs in list registers
Deleted patch
1
It is valid for an OS to put virtual interrupt ID values into the
2
list registers ICH_LR<n> which are greater than 1023. This
3
corresponds to (for example) KVM using the in-kernel emulated ITS to
4
give a (nested) guest an ITS. LPIs are delivered by the L1 kernel to
5
the L2 guest via the list registers in the same way as non-LPI
6
interrupts.
7
1
8
QEMU's code for handling writes to ICV_IARn (which happen when the L2
9
guest acknowledges an interrupt) and to ICV_EOIRn (which happen at
10
the end of the interrupt) did not consider LPIs, so it would
11
incorrectly treat interrupt IDs above 1023 as invalid. Fix this by
12
using the correct condition, which is gicv3_intid_is_special().
13
14
Note that the condition in icv_dir_write() is correct -- LPIs
15
are not valid there and so we want to ignore both "special" ID
16
values and LPIs.
17
18
(In the pseudocode this logic is in:
19
- VirtualReadIAR0(), VirtualReadIAR1(), which call IsSpecial()
20
- VirtualWriteEOIR0(), VirtualWriteEOIR1(), which call
21
VirtualIdentifierValid(data, TRUE) meaning "LPIs OK"
22
- VirtualWriteDIR(), which calls VirtualIdentifierValid(data, FALSE)
23
meaning "LPIs not OK")
24
25
This bug doesn't seem to have any visible effect on Linux L2 guests
26
most of the time, because the two bugs cancel each other out: we
27
neither mark the interrupt active nor deactivate it. However it does
28
mean that the L2 vCPU priority while the LPI handler is running will
29
not be correct, so the interrupt handler could be unexpectedly
30
interrupted by a different interrupt.
31
32
(NB: this has nothing to do with using QEMU's emulated ITS.)
33
34
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
35
Reviewed-by: Marc Zyngier <maz@kernel.org>
36
---
37
hw/intc/arm_gicv3_cpuif.c | 5 ++---
38
1 file changed, 2 insertions(+), 3 deletions(-)
39
40
diff --git a/hw/intc/arm_gicv3_cpuif.c b/hw/intc/arm_gicv3_cpuif.c
41
index XXXXXXX..XXXXXXX 100644
42
--- a/hw/intc/arm_gicv3_cpuif.c
43
+++ b/hw/intc/arm_gicv3_cpuif.c
44
@@ -XXX,XX +XXX,XX @@ static uint64_t icv_iar_read(CPUARMState *env, const ARMCPRegInfo *ri)
45
46
if (thisgrp == grp && icv_hppi_can_preempt(cs, lr)) {
47
intid = ich_lr_vintid(lr);
48
- if (intid < INTID_SECURE) {
49
+ if (!gicv3_intid_is_special(intid)) {
50
icv_activate_irq(cs, idx, grp);
51
} else {
52
/* Interrupt goes from Pending to Invalid */
53
@@ -XXX,XX +XXX,XX @@ static void icv_eoir_write(CPUARMState *env, const ARMCPRegInfo *ri,
54
trace_gicv3_icv_eoir_write(ri->crm == 8 ? 0 : 1,
55
gicv3_redist_affid(cs), value);
56
57
- if (irq >= GICV3_MAXIRQ) {
58
- /* Also catches special interrupt numbers and LPIs */
59
+ if (gicv3_intid_is_special(irq)) {
60
return;
61
}
62
63
--
64
2.25.1
65
66
diff view generated by jsdifflib

Patchew 2.1-devel-b67e4c2

© 2016 - 2025 Red Hat, Inc.