[PATCH v2] KVM: selftests: fix MAPC RDbase target formatting in vgic_lpi_stress

[Maximilian Dittgen <mdittgen@amazon.de>]

Since GITS_TYPER.PTA == 0, the ITS MAPC command demands a CPU ID,
rather than a physical redistributor address, for its RDbase
command argument.

As such, when MAPC-ing guest ITS collections, vgic_lpi_stress iterates
over CPU IDs in the range [0, nr_cpus), passing them as the RDbase
vcpu_id argument to its_send_mapc_cmd().

However, its_encode_target() in the its_send_mapc_cmd() selftest
handler expects RDbase arguments to be formatted with a 16 bit 
offset, as shown by the 16-bit target_addr right shift its implementation:

        its_mask_encode(&cmd->raw_cmd[2], target_addr >> 16, 51, 16)

At the moment, all CPU IDs passed into its_send_mapc_cmd() have no
offset, therefore becoming 0x0 after the bit shift. Thus, when
vgic_its_cmd_handle_mapc() receives the ITS command in vgic-its.c,
it always interprets the RDbase target CPU as CPU 0. All interrupts
sent to collections will be processed by vCPU 0, which defeats the
purpose of this multi-vCPU test.

Fix by creating procnum_to_rdbase() helper function, which left-shifts
the vCPU parameter received by its_send_mapc_cmd 16 bits before passing
it to its_encode_target for encoding.

Signed-off-by: Maximilian Dittgen <mdittgen@amazon.de>
---
v2: Refactor the vcpu_id left shift into procnum_to_rdbase() helper.
    Rename and rewrite commit to reflect root cause of bug which was
    improper RDbase formatting, not that MAPC expects a physical
    address as the RDbase parameter.

To validate the patch, I added the following debug code at the top of vgic_its_cmd_handle_mapc:

	u64 raw_cmd2 = le64_to_cpu(its_cmd[2]);
	u32 target_addr = its_cmd_get_target_addr(its_cmd);

	kvm_info("MAPC: coll_id=%d, raw_cmd[2]=0x%llx, parsed_target=%u\n",
		coll_id, raw_cmd2, target_addr);
	vcpu = kvm_get_vcpu_by_id(kvm, its_cmd_get_target_addr(its_cmd));
	kvm_info("MAPC: coll_id=%d, vcpu_id=%d\n", coll_id, vcpu ? vcpu->vcpu_id : -1);

I then ran `./vgic_lpi_stress -v 3` to trigger the stress selftest with 3 vCPUs.

Before the patch, the debug logs read:
kvm [20832]: MAPC: coll_id=0, raw_cmd[2]=0x8000000000000000, parsed_target=0
kvm [20832]: MAPC: coll_id=0, vcpu_id=0
kvm [20832]: MAPC: coll_id=1, raw_cmd[2]=0x8000000000000001, parsed_target=0
kvm [20832]: MAPC: coll_id=1, vcpu_id=0
kvm [20832]: MAPC: coll_id=2, raw_cmd[2]=0x8000000000000002, parsed_target=0
kvm [20832]: MAPC: coll_id=2, vcpu_id=0

Note the last bit of the cmd string reflects the collection ID, but the rest of the cmd string reads 0. The handler parses out vCPU 0 for all 3 mapc calls.

After the patch, the debug logs read:
kvm [20019]: MAPC: coll_id=0, raw_cmd[2]=0x8000000000000000, parsed_target=0
kvm [20019]: MAPC: coll_id=0, vcpu_id=0
kvm [20019]: MAPC: coll_id=1, raw_cmd[2]=0x8000000000010001, parsed_target=1
kvm [20019]: MAPC: coll_id=1, vcpu_id=1
kvm [20019]: MAPC: coll_id=2, raw_cmd[2]=0x8000000000020002, parsed_target=2
kvm [20019]: MAPC: coll_id=2, vcpu_id=2

Note that the target vcpu and target collection are both visible in the cmd string. The handler parses out the correct vCPU for all 3 mapc calls.
___
 tools/testing/selftests/kvm/lib/arm64/gic_v3_its.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/lib/arm64/gic_v3_its.c b/tools/testing/selftests/kvm/lib/arm64/gic_v3_its.c
index 09f270545646..0e2f8ed90f30 100644
--- a/tools/testing/selftests/kvm/lib/arm64/gic_v3_its.c
+++ b/tools/testing/selftests/kvm/lib/arm64/gic_v3_its.c
@@ -15,6 +15,8 @@
 #include "gic_v3.h"
 #include "processor.h"
 
+#define GITS_COLLECTION_TARGET_SHIFT 16
+
 static u64 its_read_u64(unsigned long offset)
 {
 	return readq_relaxed(GITS_BASE_GVA + offset);
@@ -163,6 +165,11 @@ static void its_encode_collection(struct its_cmd_block *cmd, u16 col)
 	its_mask_encode(&cmd->raw_cmd[2], col, 15, 0);
 }
 
+static u64 procnum_to_rdbase(u32 vcpu_id)
+{
+	return vcpu_id << GITS_COLLECTION_TARGET_SHIFT;
+}
+
 #define GITS_CMDQ_POLL_ITERATIONS	0
 
 static void its_send_cmd(void *cmdq_base, struct its_cmd_block *cmd)
@@ -217,7 +224,7 @@ void its_send_mapc_cmd(void *cmdq_base, u32 vcpu_id, u32 collection_id, bool val
 
 	its_encode_cmd(&cmd, GITS_CMD_MAPC);
 	its_encode_collection(&cmd, collection_id);
-	its_encode_target(&cmd, vcpu_id);
+	its_encode_target(&cmd, procnum_to_rdbase(vcpu_id));
 	its_encode_valid(&cmd, valid);
 
 	its_send_cmd(cmdq_base, &cmd);
-- 
2.50.1 (Apple Git-155)




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