KVM: SEV: Do cache maintenance on the source VM during intra-host migrationgrafted

Manually perform cache maintenance on the source VM during intra-host
migration to ensure no stale data is left in CPU caches after the VM is
destroyed.  Because the source VM is "converted" to a non-SEV VM, KVM's
memory reclaim flows won't trigger cache maintenance, e.g. when all guest
memory is reclaimed in response to detaching from the mmu_notifier.

Note, relying on the destination VM to do cache maintenance isn't an option
as KVM doesn't require identical guest memory configurations, i.e. the
source VM may have access to memory that the destination VM does not.
Enforcing equivalent memory configurations is infeasible, as it would
require a *deep* comparison of memslots, e.g. to verify that not only are
the memslot identical, but what the memslots point at is also identical.

Fixes: b56639318bb2 ("KVM: SEV: Add support for SEV intra host migration")
Cc: stable@vger.kernel.org
Reported-by: Stefan Teodorescu <fane@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20260923163721.1584779-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 349 insertions, 0 deletions

diff --git a/drivers/pinctrl/mediatek/pinctrl-mt8167.c b/drivers/pinctrl/mediatek/pinctrl-mt8167.c
new file mode 100644
index 000000000..cc45b0954
--- /dev/null
+++ b/drivers/pinctrl/mediatek/pinctrl-mt8167.c
@@ -0,0 +1,349 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2020 MediaTek Inc.
+ * Author: Min.Guo <min.guo@mediatek.com>
+ */
+
+#include <dt-bindings/pinctrl/mt65xx.h>
+#include <linux/of.h>
+#include <linux/module.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include "pinctrl-mtk-common.h"
+#include "pinctrl-mtk-mt8167.h"
+
+static const struct mtk_drv_group_desc mt8167_drv_grp[] = {
+	/* 0E4E8SR 4/8/12/16 */
+	MTK_DRV_GRP(4, 16, 1, 2, 4),
+	/* 0E2E4SR  2/4/6/8 */
+	MTK_DRV_GRP(2, 8, 1, 2, 2),
+	/* E8E4E2  2/4/6/8/10/12/14/16 */
+	MTK_DRV_GRP(2, 16, 0, 2, 2)
+};
+
+static const struct mtk_pin_drv_grp mt8167_pin_drv[] = {
+	MTK_PIN_DRV_GRP(0, 0xd00, 0, 0),
+	MTK_PIN_DRV_GRP(1, 0xd00, 0, 0),
+	MTK_PIN_DRV_GRP(2, 0xd00, 0, 0),
+	MTK_PIN_DRV_GRP(3, 0xd00, 0, 0),
+	MTK_PIN_DRV_GRP(4, 0xd00, 0, 0),
+
+	MTK_PIN_DRV_GRP(5, 0xd00, 4, 0),
+	MTK_PIN_DRV_GRP(6, 0xd00, 4, 0),
+	MTK_PIN_DRV_GRP(7, 0xd00, 4, 0),
+	MTK_PIN_DRV_GRP(8, 0xd00, 4, 0),
+	MTK_PIN_DRV_GRP(9, 0xd00, 4, 0),
+	MTK_PIN_DRV_GRP(10, 0xd00, 4, 0),
+
+	MTK_PIN_DRV_GRP(11, 0xd00, 8, 0),
+	MTK_PIN_DRV_GRP(12, 0xd00, 8, 0),
+	MTK_PIN_DRV_GRP(13, 0xd00, 8, 0),
+
+	MTK_PIN_DRV_GRP(14, 0xd00, 12, 2),
+	MTK_PIN_DRV_GRP(15, 0xd00, 12, 2),
+	MTK_PIN_DRV_GRP(16, 0xd00, 12, 2),
+	MTK_PIN_DRV_GRP(17, 0xd00, 12, 2),
+
+	MTK_PIN_DRV_GRP(18, 0xd10, 0, 0),
+	MTK_PIN_DRV_GRP(19, 0xd10, 0, 0),
+	MTK_PIN_DRV_GRP(20, 0xd10, 0, 0),
+
+	MTK_PIN_DRV_GRP(21, 0xd00, 12, 2),
+	MTK_PIN_DRV_GRP(22, 0xd00, 12, 2),
+	MTK_PIN_DRV_GRP(23, 0xd00, 12, 2),
+
+	MTK_PIN_DRV_GRP(24, 0xd00, 8, 0),
+	MTK_PIN_DRV_GRP(25, 0xd00, 8, 0),
+
+	MTK_PIN_DRV_GRP(26, 0xd10, 4, 1),
+	MTK_PIN_DRV_GRP(27, 0xd10, 4, 1),
+	MTK_PIN_DRV_GRP(28, 0xd10, 4, 1),
+	MTK_PIN_DRV_GRP(29, 0xd10, 4, 1),
+	MTK_PIN_DRV_GRP(30, 0xd10, 4, 1),
+
+	MTK_PIN_DRV_GRP(31, 0xd10, 8, 1),
+	MTK_PIN_DRV_GRP(32, 0xd10, 8, 1),
+	MTK_PIN_DRV_GRP(33, 0xd10, 8, 1),
+
+	MTK_PIN_DRV_GRP(34, 0xd10, 12, 0),
+	MTK_PIN_DRV_GRP(35, 0xd10, 12, 0),
+
+	MTK_PIN_DRV_GRP(36, 0xd20, 0, 0),
+	MTK_PIN_DRV_GRP(37, 0xd20, 0, 0),
+	MTK_PIN_DRV_GRP(38, 0xd20, 0, 0),
+	MTK_PIN_DRV_GRP(39, 0xd20, 0, 0),
+
+	MTK_PIN_DRV_GRP(40, 0xd20, 4, 1),
+
+	MTK_PIN_DRV_GRP(41, 0xd20, 8, 1),
+	MTK_PIN_DRV_GRP(42, 0xd20, 8, 1),
+	MTK_PIN_DRV_GRP(43, 0xd20, 8, 1),
+
+	MTK_PIN_DRV_GRP(44, 0xd20, 12, 1),
+	MTK_PIN_DRV_GRP(45, 0xd20, 12, 1),
+	MTK_PIN_DRV_GRP(46, 0xd20, 12, 1),
+	MTK_PIN_DRV_GRP(47, 0xd20, 12, 1),
+
+	MTK_PIN_DRV_GRP(48, 0xd30, 0, 1),
+	MTK_PIN_DRV_GRP(49, 0xd30, 0, 1),
+	MTK_PIN_DRV_GRP(50, 0xd30, 0, 1),
+	MTK_PIN_DRV_GRP(51, 0xd30, 0, 1),
+
+	MTK_PIN_DRV_GRP(54, 0xd30, 8, 1),
+
+	MTK_PIN_DRV_GRP(55, 0xd30, 12, 1),
+	MTK_PIN_DRV_GRP(56, 0xd30, 12, 1),
+	MTK_PIN_DRV_GRP(57, 0xd30, 12, 1),
+
+	MTK_PIN_DRV_GRP(62, 0xd40, 8, 1),
+	MTK_PIN_DRV_GRP(63, 0xd40, 8, 1),
+	MTK_PIN_DRV_GRP(64, 0xd40, 8, 1),
+	MTK_PIN_DRV_GRP(65, 0xd40, 8, 1),
+	MTK_PIN_DRV_GRP(66, 0xd40, 8, 1),
+	MTK_PIN_DRV_GRP(67, 0xd40, 8, 1),
+
+	MTK_PIN_DRV_GRP(68, 0xd40, 12, 2),
+
+	MTK_PIN_DRV_GRP(69, 0xd50, 0, 2),
+
+	MTK_PIN_DRV_GRP(70, 0xd50, 4, 2),
+	MTK_PIN_DRV_GRP(71, 0xd50, 4, 2),
+	MTK_PIN_DRV_GRP(72, 0xd50, 4, 2),
+	MTK_PIN_DRV_GRP(73, 0xd50, 4, 2),
+
+	MTK_PIN_DRV_GRP(100, 0xd50, 8, 1),
+	MTK_PIN_DRV_GRP(101, 0xd50, 8, 1),
+	MTK_PIN_DRV_GRP(102, 0xd50, 8, 1),
+	MTK_PIN_DRV_GRP(103, 0xd50, 8, 1),
+
+	MTK_PIN_DRV_GRP(104, 0xd50, 12, 2),
+
+	MTK_PIN_DRV_GRP(105, 0xd60, 0, 2),
+
+	MTK_PIN_DRV_GRP(106, 0xd60, 4, 2),
+	MTK_PIN_DRV_GRP(107, 0xd60, 4, 2),
+	MTK_PIN_DRV_GRP(108, 0xd60, 4, 2),
+	MTK_PIN_DRV_GRP(109, 0xd60, 4, 2),
+
+	MTK_PIN_DRV_GRP(110, 0xd70, 0, 2),
+	MTK_PIN_DRV_GRP(111, 0xd70, 0, 2),
+	MTK_PIN_DRV_GRP(112, 0xd70, 0, 2),
+	MTK_PIN_DRV_GRP(113, 0xd70, 0, 2),
+
+	MTK_PIN_DRV_GRP(114, 0xd70, 4, 2),
+
+	MTK_PIN_DRV_GRP(115, 0xd60, 12, 2),
+
+	MTK_PIN_DRV_GRP(116, 0xd60, 8, 2),
+
+	MTK_PIN_DRV_GRP(117, 0xd70, 0, 2),
+	MTK_PIN_DRV_GRP(118, 0xd70, 0, 2),
+	MTK_PIN_DRV_GRP(119, 0xd70, 0, 2),
+	MTK_PIN_DRV_GRP(120, 0xd70, 0, 2),
+};
+
+static const struct mtk_pin_spec_pupd_set_samereg mt8167_spec_pupd[] = {
+	MTK_PIN_PUPD_SPEC_SR(14, 0xe50, 14, 13, 12),
+	MTK_PIN_PUPD_SPEC_SR(15, 0xe60, 2, 1, 0),
+	MTK_PIN_PUPD_SPEC_SR(16, 0xe60, 6, 5, 4),
+	MTK_PIN_PUPD_SPEC_SR(17, 0xe60, 10, 9, 8),
+
+	MTK_PIN_PUPD_SPEC_SR(21, 0xe60, 14, 13, 12),
+	MTK_PIN_PUPD_SPEC_SR(22, 0xe70, 2, 1, 0),
+	MTK_PIN_PUPD_SPEC_SR(23, 0xe70, 6, 5, 4),
+
+	MTK_PIN_PUPD_SPEC_SR(40, 0xe80, 2, 1, 0),
+	MTK_PIN_PUPD_SPEC_SR(41, 0xe80, 6, 5, 4),
+	MTK_PIN_PUPD_SPEC_SR(42, 0xe90, 2, 1, 0),
+	MTK_PIN_PUPD_SPEC_SR(43, 0xe90, 6, 5, 4),
+
+	MTK_PIN_PUPD_SPEC_SR(68, 0xe50, 10, 9, 8),
+	MTK_PIN_PUPD_SPEC_SR(69, 0xe50, 6, 5, 4),
+	MTK_PIN_PUPD_SPEC_SR(70, 0xe40, 6, 5, 4),
+	MTK_PIN_PUPD_SPEC_SR(71, 0xe40, 10, 9, 8),
+	MTK_PIN_PUPD_SPEC_SR(72, 0xe40, 14, 13, 12),
+	MTK_PIN_PUPD_SPEC_SR(73, 0xe50, 2, 1, 0),
+
+	MTK_PIN_PUPD_SPEC_SR(104, 0xe40, 2, 1, 0),
+	MTK_PIN_PUPD_SPEC_SR(105, 0xe30, 14, 13, 12),
+	MTK_PIN_PUPD_SPEC_SR(106, 0xe20, 14, 13, 12),
+	MTK_PIN_PUPD_SPEC_SR(107, 0xe30, 2, 1, 0),
+	MTK_PIN_PUPD_SPEC_SR(108, 0xe30, 6, 5, 4),
+	MTK_PIN_PUPD_SPEC_SR(109, 0xe30, 10, 9, 8),
+	MTK_PIN_PUPD_SPEC_SR(110, 0xe10, 14, 13, 12),
+	MTK_PIN_PUPD_SPEC_SR(111, 0xe10, 10, 9, 8),
+	MTK_PIN_PUPD_SPEC_SR(112, 0xe10, 6, 5, 4),
+	MTK_PIN_PUPD_SPEC_SR(113, 0xe10, 2, 1, 0),
+	MTK_PIN_PUPD_SPEC_SR(114, 0xe20, 10, 9, 8),
+	MTK_PIN_PUPD_SPEC_SR(115, 0xe20, 2, 1, 0),
+	MTK_PIN_PUPD_SPEC_SR(116, 0xe20, 6, 5, 4),
+	MTK_PIN_PUPD_SPEC_SR(117, 0xe00, 14, 13, 12),
+	MTK_PIN_PUPD_SPEC_SR(118, 0xe00, 10, 9, 8),
+	MTK_PIN_PUPD_SPEC_SR(119, 0xe00, 6, 5, 4),
+	MTK_PIN_PUPD_SPEC_SR(120, 0xe00, 2, 1, 0),
+};
+
+static const struct mtk_pin_ies_smt_set mt8167_ies_set[] = {
+	MTK_PIN_IES_SMT_SPEC(0, 6, 0x900, 2),
+	MTK_PIN_IES_SMT_SPEC(7, 10, 0x900, 3),
+	MTK_PIN_IES_SMT_SPEC(11, 13, 0x900, 12),
+	MTK_PIN_IES_SMT_SPEC(14, 17, 0x900, 13),
+	MTK_PIN_IES_SMT_SPEC(18, 20, 0x910, 10),
+	MTK_PIN_IES_SMT_SPEC(21, 23, 0x900, 13),
+	MTK_PIN_IES_SMT_SPEC(24, 25, 0x900, 12),
+	MTK_PIN_IES_SMT_SPEC(26, 30, 0x900, 0),
+	MTK_PIN_IES_SMT_SPEC(31, 33, 0x900, 1),
+	MTK_PIN_IES_SMT_SPEC(34, 39, 0x900, 2),
+	MTK_PIN_IES_SMT_SPEC(40, 40, 0x910, 11),
+	MTK_PIN_IES_SMT_SPEC(41, 43, 0x900, 10),
+	MTK_PIN_IES_SMT_SPEC(44, 47, 0x900, 11),
+	MTK_PIN_IES_SMT_SPEC(48, 51, 0x900, 14),
+	MTK_PIN_IES_SMT_SPEC(52, 53, 0x910, 0),
+	MTK_PIN_IES_SMT_SPEC(54, 54, 0x910, 2),
+	MTK_PIN_IES_SMT_SPEC(55, 57, 0x910, 4),
+	MTK_PIN_IES_SMT_SPEC(58, 59, 0x900, 15),
+	MTK_PIN_IES_SMT_SPEC(60, 61, 0x910, 1),
+	MTK_PIN_IES_SMT_SPEC(62, 65, 0x910, 5),
+	MTK_PIN_IES_SMT_SPEC(66, 67, 0x910, 6),
+	MTK_PIN_IES_SMT_SPEC(68, 68, 0x930, 2),
+	MTK_PIN_IES_SMT_SPEC(69, 69, 0x930, 1),
+	MTK_PIN_IES_SMT_SPEC(70, 70, 0x930, 6),
+	MTK_PIN_IES_SMT_SPEC(71, 71, 0x930, 5),
+	MTK_PIN_IES_SMT_SPEC(72, 72, 0x930, 4),
+	MTK_PIN_IES_SMT_SPEC(73, 73, 0x930, 3),
+	MTK_PIN_IES_SMT_SPEC(100, 103, 0x910, 7),
+	MTK_PIN_IES_SMT_SPEC(104, 104, 0x920, 12),
+	MTK_PIN_IES_SMT_SPEC(105, 105, 0x920, 11),
+	MTK_PIN_IES_SMT_SPEC(106, 106, 0x930, 0),
+	MTK_PIN_IES_SMT_SPEC(107, 107, 0x920, 15),
+	MTK_PIN_IES_SMT_SPEC(108, 108, 0x920, 14),
+	MTK_PIN_IES_SMT_SPEC(109, 109, 0x920, 13),
+	MTK_PIN_IES_SMT_SPEC(110, 110, 0x920, 9),
+	MTK_PIN_IES_SMT_SPEC(111, 111, 0x920, 8),
+	MTK_PIN_IES_SMT_SPEC(112, 112, 0x920, 7),
+	MTK_PIN_IES_SMT_SPEC(113, 113, 0x920, 6),
+	MTK_PIN_IES_SMT_SPEC(114, 114, 0x920, 10),
+	MTK_PIN_IES_SMT_SPEC(115, 115, 0x920, 1),
+	MTK_PIN_IES_SMT_SPEC(116, 116, 0x920, 0),
+	MTK_PIN_IES_SMT_SPEC(117, 117, 0x920, 5),
+	MTK_PIN_IES_SMT_SPEC(118, 118, 0x920, 4),
+	MTK_PIN_IES_SMT_SPEC(119, 119, 0x920, 3),
+	MTK_PIN_IES_SMT_SPEC(120, 120, 0x920, 2),
+	MTK_PIN_IES_SMT_SPEC(121, 124, 0x910, 9),
+};
+
+static const struct mtk_pin_ies_smt_set mt8167_smt_set[] = {
+	MTK_PIN_IES_SMT_SPEC(0, 6, 0xA00, 2),
+	MTK_PIN_IES_SMT_SPEC(7, 10, 0xA00, 3),
+	MTK_PIN_IES_SMT_SPEC(11, 13, 0xA00, 12),
+	MTK_PIN_IES_SMT_SPEC(14, 17, 0xA00, 13),
+	MTK_PIN_IES_SMT_SPEC(18, 20, 0xA10, 10),
+	MTK_PIN_IES_SMT_SPEC(21, 23, 0xA00, 13),
+	MTK_PIN_IES_SMT_SPEC(24, 25, 0xA00, 12),
+	MTK_PIN_IES_SMT_SPEC(26, 30, 0xA00, 0),
+	MTK_PIN_IES_SMT_SPEC(31, 33, 0xA00, 1),
+	MTK_PIN_IES_SMT_SPEC(34, 39, 0xA00, 2),
+	MTK_PIN_IES_SMT_SPEC(40, 40, 0xA10, 11),
+	MTK_PIN_IES_SMT_SPEC(41, 43, 0xA00, 10),
+	MTK_PIN_IES_SMT_SPEC(44, 47, 0xA00, 11),
+	MTK_PIN_IES_SMT_SPEC(48, 51, 0xA00, 14),
+	MTK_PIN_IES_SMT_SPEC(52, 53, 0xA10, 0),
+	MTK_PIN_IES_SMT_SPEC(54, 54, 0xA10, 2),
+	MTK_PIN_IES_SMT_SPEC(55, 57, 0xA10, 4),
+	MTK_PIN_IES_SMT_SPEC(58, 59, 0xA00, 15),
+	MTK_PIN_IES_SMT_SPEC(60, 61, 0xA10, 1),
+	MTK_PIN_IES_SMT_SPEC(62, 65, 0xA10, 5),
+	MTK_PIN_IES_SMT_SPEC(66, 67, 0xA10, 6),
+	MTK_PIN_IES_SMT_SPEC(68, 68, 0xA30, 2),
+	MTK_PIN_IES_SMT_SPEC(69, 69, 0xA30, 1),
+	MTK_PIN_IES_SMT_SPEC(70, 70, 0xA30, 3),
+	MTK_PIN_IES_SMT_SPEC(71, 71, 0xA30, 4),
+	MTK_PIN_IES_SMT_SPEC(72, 72, 0xA30, 5),
+	MTK_PIN_IES_SMT_SPEC(73, 73, 0xA30, 6),
+
+	MTK_PIN_IES_SMT_SPEC(100, 103, 0xA10, 7),
+	MTK_PIN_IES_SMT_SPEC(104, 104, 0xA20, 12),
+	MTK_PIN_IES_SMT_SPEC(105, 105, 0xA20, 11),
+	MTK_PIN_IES_SMT_SPEC(106, 106, 0xA30, 13),
+	MTK_PIN_IES_SMT_SPEC(107, 107, 0xA20, 14),
+	MTK_PIN_IES_SMT_SPEC(108, 108, 0xA20, 15),
+	MTK_PIN_IES_SMT_SPEC(109, 109, 0xA30, 0),
+	MTK_PIN_IES_SMT_SPEC(110, 110, 0xA20, 9),
+	MTK_PIN_IES_SMT_SPEC(111, 111, 0xA20, 8),
+	MTK_PIN_IES_SMT_SPEC(112, 112, 0xA20, 7),
+	MTK_PIN_IES_SMT_SPEC(113, 113, 0xA20, 6),
+	MTK_PIN_IES_SMT_SPEC(114, 114, 0xA20, 10),
+	MTK_PIN_IES_SMT_SPEC(115, 115, 0xA20, 1),
+	MTK_PIN_IES_SMT_SPEC(116, 116, 0xA20, 0),
+	MTK_PIN_IES_SMT_SPEC(117, 117, 0xA20, 5),
+	MTK_PIN_IES_SMT_SPEC(118, 118, 0xA20, 4),
+	MTK_PIN_IES_SMT_SPEC(119, 119, 0xA20, 3),
+	MTK_PIN_IES_SMT_SPEC(120, 120, 0xA20, 2),
+	MTK_PIN_IES_SMT_SPEC(121, 124, 0xA10, 9),
+};
+
+static const struct mtk_pinctrl_devdata mt8167_pinctrl_data = {
+	.pins = mtk_pins_mt8167,
+	.npins = ARRAY_SIZE(mtk_pins_mt8167),
+	.grp_desc = mt8167_drv_grp,
+	.n_grp_cls = ARRAY_SIZE(mt8167_drv_grp),
+	.pin_drv_grp = mt8167_pin_drv,
+	.n_pin_drv_grps = ARRAY_SIZE(mt8167_pin_drv),
+	.spec_ies = mt8167_ies_set,
+	.n_spec_ies = ARRAY_SIZE(mt8167_ies_set),
+	.spec_pupd = mt8167_spec_pupd,
+	.n_spec_pupd = ARRAY_SIZE(mt8167_spec_pupd),
+	.spec_smt = mt8167_smt_set,
+	.n_spec_smt = ARRAY_SIZE(mt8167_smt_set),
+	.spec_pull_set = mtk_pctrl_spec_pull_set_samereg,
+	.spec_ies_smt_set = mtk_pconf_spec_set_ies_smt_range,
+	.dir_offset = 0x0000,
+	.pullen_offset = 0x0500,
+	.pullsel_offset = 0x0600,
+	.dout_offset = 0x0100,
+	.din_offset = 0x0200,
+	.pinmux_offset = 0x0300,
+	.type1_start = 125,
+	.type1_end = 125,
+	.port_shf = 4,
+	.port_mask = 0xf,
+	.port_align = 4,
+	.mode_mask = 0xf,
+	.mode_per_reg = 5,
+	.mode_shf = 4,
+	.eint_hw = {
+		.port_mask = 7,
+		.ports     = 6,
+		.ap_num    = 169,
+		.db_cnt    = 64,
+		.db_time = debounce_time_mt6795,
+	},
+};
+
+static const struct of_device_id mt8167_pctrl_match[] = {
+	{ .compatible = "mediatek,mt8167-pinctrl", .data = &mt8167_pinctrl_data },
+	{}
+};
+
+MODULE_DEVICE_TABLE(of, mt8167_pctrl_match);
+
+static struct platform_driver mtk_pinctrl_driver = {
+	.probe = mtk_pctrl_common_probe,
+	.driver = {
+		.name = "mediatek-mt8167-pinctrl",
+		.of_match_table = mt8167_pctrl_match,
+		.pm = pm_sleep_ptr(&mtk_eint_pm_ops),
+	},
+};
+
+static int __init mtk_pinctrl_init(void)
+{
+	return platform_driver_register(&mtk_pinctrl_driver);
+}
+arch_initcall(mtk_pinctrl_init);
+
+MODULE_DESCRIPTION("MediaTek MT8167 Pinctrl Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_IMPORT_NS("MTK_PINCTRL");