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KVM: selftests: fix MAPC RDbase target formatting in vgic_lpi_stress

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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>
Link: https://patch.msgid.link/20251020145946.48288-1-mdittgen@amazon.de
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Maximilian Dittgen
2025-10-20 16:59:46 +02:00
committed by Marc Zyngier
parent da888524c3
commit a24f7afce0
1 changed files with 8 additions and 1 deletions
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9
tools/testing/selftests/kvm/lib/arm64/gic_v3_its.c
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@@ -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);