Commit 2c6978ea authored by Neeraj Upadhyay's avatar Neeraj Upadhyay Committed by Borislav Petkov (AMD)
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x86/apic: Add support to send IPI for Secure AVIC 



Secure AVIC hardware accelerates only Self-IPI, i.e. on WRMSR to APIC_SELF_IPI
and APIC_ICR (with destination shorthand equal to Self) registers, hardware
takes care of updating the APIC_IRR in the APIC backing page of the vCPU.

For other IPI types (cross-vCPU, broadcast IPIs), software needs to take care
of updating the APIC_IRR state of the target vCPUs and to ensure that the
target vCPUs notice the new pending interrupt.

Add new callbacks in the Secure AVIC driver for sending IPI requests.  These
callbacks update the IRR in the target guest vCPU's APIC backing page. To
ensure that the remote vCPU notices the new pending interrupt, reuse the GHCB
MSR handling code in vc_handle_msr() to issue APIC_ICR MSR-write GHCB protocol
event to the hypervisor.

For Secure AVIC guests, on APIC_ICR write MSR exits, the hypervisor notifies
the target vCPU by either sending an AVIC doorbell (if target vCPU is running)
or by waking up the non-running target vCPU.

Co-developed-by: default avatarKishon Vijay Abraham I <kvijayab@amd.com>
Signed-off-by: default avatarKishon Vijay Abraham I <kvijayab@amd.com>
Signed-off-by: default avatarNeeraj Upadhyay <Neeraj.Upadhyay@amd.com>
Signed-off-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: default avatarTianyu Lan <tiala@microsoft.com>
Link: https://lore.kernel.org/20250828110824.208851-1-Neeraj.Upadhyay@amd.com
parent 8c79a68d

arch/x86/coco/sev/core.c

+28 −0
Original line number Diff line number Diff line
@@ -1108,6 +1108,34 @@ int __init sev_es_efi_map_ghcbs_cas(pgd_t *pgd) 
	return 0;

}



void savic_ghcb_msr_write(u32 reg, u64 value)

{

	u64 msr = APIC_BASE_MSR + (reg >> 4);

	struct pt_regs regs = {

		.cx = msr,

		.ax = lower_32_bits(value),

		.dx = upper_32_bits(value)

	};

	struct es_em_ctxt ctxt = { .regs = &regs };

	struct ghcb_state state;

	enum es_result res;

	struct ghcb *ghcb;



	guard(irqsave)();



	ghcb = __sev_get_ghcb(&state);

	vc_ghcb_invalidate(ghcb);



	res = sev_es_ghcb_handle_msr(ghcb, &ctxt, true);

	if (res != ES_OK) {

		pr_err("Secure AVIC MSR (0x%llx) write returned error (%d)\n", msr, res);

		/* MSR writes should never fail. Any failure is fatal error for SNP guest */

		snp_abort();

	}



	__sev_put_ghcb(&state);

}



enum es_result savic_register_gpa(u64 gpa)

{

	struct ghcb_state state;

arch/x86/coco/sev/vc-handle.c

+6 −5
Original line number Diff line number Diff line
@@ -402,14 +402,10 @@ static enum es_result __vc_handle_secure_tsc_msrs(struct es_em_ctxt *ctxt, bool 
	return ES_OK;

}



static enum es_result vc_handle_msr(struct ghcb *ghcb, struct es_em_ctxt *ctxt)

enum es_result sev_es_ghcb_handle_msr(struct ghcb *ghcb, struct es_em_ctxt *ctxt, bool write)

{

	struct pt_regs *regs = ctxt->regs;

	enum es_result ret;

	bool write;



	/* Is it a WRMSR? */

	write = ctxt->insn.opcode.bytes[1] == 0x30;



	switch (regs->cx) {

	case MSR_SVSM_CAA:
@@ -439,6 +435,11 @@ static enum es_result vc_handle_msr(struct ghcb *ghcb, struct es_em_ctxt *ctxt) 
	return ret;

}



static enum es_result vc_handle_msr(struct ghcb *ghcb, struct es_em_ctxt *ctxt)

{

	return sev_es_ghcb_handle_msr(ghcb, ctxt, ctxt->insn.opcode.bytes[1] == 0x30);

}



static void __init vc_early_forward_exception(struct es_em_ctxt *ctxt)

{

	int trapnr = ctxt->fi.vector;

arch/x86/include/asm/sev-internal.h

+2 −0
Original line number Diff line number Diff line
@@ -97,6 +97,8 @@ static __always_inline void sev_es_wr_ghcb_msr(u64 val) 
	native_wrmsr(MSR_AMD64_SEV_ES_GHCB, low, high);

}



enum es_result sev_es_ghcb_handle_msr(struct ghcb *ghcb, struct es_em_ctxt *ctxt, bool write);



void snp_register_ghcb_early(unsigned long paddr);

bool sev_es_negotiate_protocol(void);

bool sev_es_check_cpu_features(void);

arch/x86/include/asm/sev.h

+2 −0
Original line number Diff line number Diff line
@@ -534,6 +534,7 @@ int snp_svsm_vtpm_send_command(u8 *buffer); 
void __init snp_secure_tsc_prepare(void);

void __init snp_secure_tsc_init(void);

enum es_result savic_register_gpa(u64 gpa);

void savic_ghcb_msr_write(u32 reg, u64 value);



static __always_inline void vc_ghcb_invalidate(struct ghcb *ghcb)

{
@@ -607,6 +608,7 @@ static inline int snp_svsm_vtpm_send_command(u8 *buffer) { return -ENODEV; } 
static inline void __init snp_secure_tsc_prepare(void) { }

static inline void __init snp_secure_tsc_init(void) { }

static inline enum es_result savic_register_gpa(u64 gpa) { return ES_UNSUPPORTED; }

static inline void savic_ghcb_msr_write(u32 reg, u64 value) { }



#endif	/* CONFIG_AMD_MEM_ENCRYPT */

arch/x86/kernel/apic/x2apic_savic.c

+135 −3
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 
 */



#include <linux/cc_platform.h>

#include <linux/cpumask.h>

#include <linux/percpu-defs.h>

#include <linux/align.h>
@@ -120,6 +121,73 @@ static u32 savic_read(u32 reg) 


#define SAVIC_NMI_REQ		0x278



/*

 * On WRMSR to APIC_SELF_IPI register by the guest, Secure AVIC hardware

 * updates the APIC_IRR in the APIC backing page of the vCPU. In addition,

 * hardware evaluates the new APIC_IRR update for interrupt injection to

 * the vCPU. So, self IPIs are hardware-accelerated.

 */

static inline void self_ipi_reg_write(unsigned int vector)

{

	native_apic_msr_write(APIC_SELF_IPI, vector);

}



static void send_ipi_dest(unsigned int cpu, unsigned int vector)

{

	update_vector(cpu, APIC_IRR, vector, true);

}



static void send_ipi_allbut(unsigned int vector)

{

	unsigned int cpu, src_cpu;



	guard(irqsave)();



	src_cpu = raw_smp_processor_id();



	for_each_cpu(cpu, cpu_online_mask) {

		if (cpu == src_cpu)

			continue;

		send_ipi_dest(cpu, vector);

	}

}



static inline void self_ipi(unsigned int vector)

{

	u32 icr_low = APIC_SELF_IPI | vector;



	native_x2apic_icr_write(icr_low, 0);

}



static void savic_icr_write(u32 icr_low, u32 icr_high)

{

	unsigned int dsh, vector;

	u64 icr_data;



	dsh = icr_low & APIC_DEST_ALLBUT;

	vector = icr_low & APIC_VECTOR_MASK;



	switch (dsh) {

	case APIC_DEST_SELF:

		self_ipi(vector);

		break;

	case APIC_DEST_ALLINC:

		self_ipi(vector);

		fallthrough;

	case APIC_DEST_ALLBUT:

		send_ipi_allbut(vector);

		break;

	default:

		send_ipi_dest(icr_high, vector);

		break;

	}



	icr_data = ((u64)icr_high) << 32 | icr_low;

	if (dsh != APIC_DEST_SELF)

		savic_ghcb_msr_write(APIC_ICR, icr_data);

	apic_set_reg64(this_cpu_ptr(savic_page), APIC_ICR, icr_data);

}



static void savic_write(u32 reg, u32 data)

{

	void *ap = this_cpu_ptr(savic_page);
@@ -130,7 +198,6 @@ static void savic_write(u32 reg, u32 data) 
	case APIC_LVT1:

	case APIC_TMICT:

	case APIC_TDCR:

	case APIC_SELF_IPI:

	case APIC_TASKPRI:

	case APIC_EOI:

	case APIC_SPIV:
@@ -146,7 +213,10 @@ static void savic_write(u32 reg, u32 data) 
		apic_set_reg(ap, reg, data);

		break;

	case APIC_ICR:

		apic_set_reg64(ap, reg, (u64)data);

		savic_icr_write(data, 0);

		break;

	case APIC_SELF_IPI:

		self_ipi_reg_write(data);

		break;

	/* ALLOWED_IRR offsets are writable */

	case SAVIC_ALLOWED_IRR ... SAVIC_ALLOWED_IRR + 0x70:
@@ -160,6 +230,61 @@ static void savic_write(u32 reg, u32 data) 
	}

}



static void send_ipi(u32 dest, unsigned int vector, unsigned int dsh)

{

	unsigned int icr_low;



	icr_low = __prepare_ICR(dsh, vector, APIC_DEST_PHYSICAL);

	savic_icr_write(icr_low, dest);

}



static void savic_send_ipi(int cpu, int vector)

{

	u32 dest = per_cpu(x86_cpu_to_apicid, cpu);



	send_ipi(dest, vector, 0);

}



static void send_ipi_mask(const struct cpumask *mask, unsigned int vector, bool excl_self)

{

	unsigned int cpu, this_cpu;



	guard(irqsave)();



	this_cpu = raw_smp_processor_id();



	for_each_cpu(cpu, mask) {

		if (excl_self && cpu == this_cpu)

			continue;

		send_ipi(per_cpu(x86_cpu_to_apicid, cpu), vector, 0);

	}

}



static void savic_send_ipi_mask(const struct cpumask *mask, int vector)

{

	send_ipi_mask(mask, vector, false);

}



static void savic_send_ipi_mask_allbutself(const struct cpumask *mask, int vector)

{

	send_ipi_mask(mask, vector, true);

}



static void savic_send_ipi_allbutself(int vector)

{

	send_ipi(0, vector, APIC_DEST_ALLBUT);

}



static void savic_send_ipi_all(int vector)

{

	send_ipi(0, vector, APIC_DEST_ALLINC);

}



static void savic_send_ipi_self(int vector)

{

	self_ipi_reg_write(vector);

}



static void savic_update_vector(unsigned int cpu, unsigned int vector, bool set)

{

	update_vector(cpu, SAVIC_ALLOWED_IRR, vector, set);
@@ -231,13 +356,20 @@ static struct apic apic_x2apic_savic __ro_after_init = { 


	.calc_dest_apicid		= apic_default_calc_apicid,



	.send_IPI			= savic_send_ipi,

	.send_IPI_mask			= savic_send_ipi_mask,

	.send_IPI_mask_allbutself	= savic_send_ipi_mask_allbutself,

	.send_IPI_allbutself		= savic_send_ipi_allbutself,

	.send_IPI_all			= savic_send_ipi_all,

	.send_IPI_self			= savic_send_ipi_self,



	.nmi_to_offline_cpu		= true,



	.read				= savic_read,

	.write				= savic_write,

	.eoi				= native_apic_msr_eoi,

	.icr_read			= native_x2apic_icr_read,

	.icr_write			= native_x2apic_icr_write,

	.icr_write			= savic_icr_write,



	.update_vector			= savic_update_vector,

};